WO2022134803A1 - Monitoring device and method for determining accuracy of pulse pressure variation - Google Patents

Abstract

A monitoring device and a method for determining the accuracy of pulse pressure variation (PPV), the monitoring device being used for monitoring vital sign parameters of a target object, and comprising: a signal acquisition circuit (102), which is used for acquiring vital sign signals of the target object; and a processor (101), which is used for processing the vital sign signals so as to obtain the vital sign parameters of the target object; and the processor (101) is further used to: process data of the vital sign parameters so as to obtain the PPV of the target object; acquire a plurality of associated parameters of the target object that characterize the accuracy of the PPV; and determine the accuracy of the PPV on the basis of the plurality of associated parameters, thereby reducing the possibility that a user misjudges the physiological state of a patient due to inaccurate PPV.

Description

Monitoring device and method for determining the accuracy of pulse pressure variability

manual

technical field

The present invention generally relates to the technical field of medical devices, and more particularly, to a monitoring device and a method for determining the accuracy of pulse pressure variability.

Background technique

Fluid responsiveness refers to the ability to increase cardiac output (CO) correspondingly after infusion of a certain amount of fluid in a short period of time. For critically ill patients, fluid responsiveness is an extremely important link in hemodynamic evaluation and the basis for fluid management.

Clinically, pulse pressure variation (PPV) can be used to assess patients' fluid responsiveness and guide fluid management in mechanically ventilated patients. Especially in the ICU, most of the patients are mechanically ventilated with invasive blood pressure (IBP) monitoring, and it is more convenient to obtain PPV. Academic studies have confirmed that the value of PPV can be used to indicate whether a patient is fluid responsive.

It is worth noting that the use of PPV to predict fluid responsiveness in mechanically ventilated patients has certain prerequisites, otherwise the calculation results will be inaccurate. At this stage, the presentation of PPV parameters does not indicate the accuracy, and the measured PPV values that do not meet the conditions may mislead the doctor's judgment on the patient's volume responsiveness, cause erroneous clinical decisions, and affect the fluid management and the patient's hemodynamic status. Optimization.

SUMMARY OF THE INVENTION

The present invention has been made to solve at least one of the above-mentioned problems. Specifically, one aspect of the present invention provides a monitoring device, the monitoring device comprising:

The signal acquisition circuit is used to acquire the vital sign signal of the target object;

a processor, configured to process the vital sign signal to obtain the vital sign parameter of the target object; the processor is further configured to:

processing the data of the vital sign parameters to obtain the pulse pressure variability of the target object;

obtaining a plurality of associated parameters of the target object that characterize the accuracy of the pulse pressure variability;

Based on the plurality of associated parameters, the accuracy of the pulse pressure variability is determined.

Another aspect of the present invention provides a monitoring device for monitoring the vital sign parameters of a target object, including:

a signal acquisition circuit for acquiring vital sign signals of the target object;

a processor, configured to process the vital sign signal to obtain the vital sign parameter of the target object; the processor is further configured to:

processing the data of the vital sign parameters to obtain monitoring parameters for characterizing the volume responsiveness of the target subject;

obtaining a plurality of associated parameters of the target object that characterize the accuracy of the monitoring parameters;

Based on the plurality of associated parameters, the accuracy of the monitoring parameters is determined.

Another aspect of the present invention provides a monitoring device for monitoring vital sign parameters of a target object, the monitoring device comprising:

a signal acquisition circuit for acquiring vital sign signals of the target object;

a processor, configured to process the vital sign signal to obtain the vital sign parameter of the target object; the processor is further configured to:

processing the data of the vital sign parameters to obtain monitoring parameters for characterizing the volume responsiveness of the target subject;

acquiring associated features of the target object that characterize the accuracy of the monitoring parameters;

Based on the associated features, the accuracy of the monitoring parameter is determined.

Another aspect of the present application further provides a method for determining the accuracy of pulse pressure variability, the method comprising: acquiring vital sign parameters of a target object; processing the data of the vital sign parameters to obtain the target object The pulse pressure variability is obtained; a plurality of associated parameters of the target object that characterize the accuracy of the pulse pressure variability are obtained; and the accuracy of the pulse pressure variability is determined based on the plurality of associated parameters.

According to the monitoring device and the method for determining the accuracy of the pulse pressure variability of the present application, the accuracy of the pulse pressure variability can be determined based on the plurality of associated parameters, so that the result of the accuracy of the pulse pressure variability can be fed back to It is convenient for the user to find the wrong PPV value in time, thereby reducing the possibility of the user misjudging the patient's physiological state due to the inaccurate PPV value. Thus, the accuracy of PPV parameter monitoring is ensured, so as to better assist doctors in fluid management of patients.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

Fig. 1 shows a schematic block diagram of a monitoring device in an embodiment of the present invention;

FIG. 2 shows a schematic diagram of a display interface of a display in an embodiment of the present invention;

Figure 3 shows a flowchart of a method of determining the accuracy of pulse pressure variability in one embodiment of the present invention.

Detailed ways

In order to make the objects, technical solutions and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments of the present invention, and it should be understood that the present invention is not limited by the example embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other instances, some technical features known in the art have not been described in order to avoid obscuring the present invention.

It should be understood that the present invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the/the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the terms "compose" and/or "include", when used in this specification, identify the presence of stated features, integers, steps, operations, elements and/or components, but do not exclude one or more other The presence or addition of features, integers, steps, operations, elements, parts and/or groups. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

In view of the problems existing in the aforementioned monitoring equipment, the present application provides a monitoring equipment for monitoring vital sign parameters of a target object, including: a signal acquisition circuit for collecting vital sign signals of the target object; a processor for monitoring vital signs of the target object The vital sign signal is processed to obtain the vital sign parameter of the target object; the processor is further used to: process the data of the vital sign parameter to obtain the pulse pressure variability of the target object; obtain the target object representing the accuracy of the pulse pressure variability Multiple associated parameters of ; based on multiple associated parameters, determine the accuracy of pulse pressure variability.

According to the monitoring device and the method for determining the accuracy of the pulse pressure variability of the present application, the accuracy of the pulse pressure variability can be determined based on a plurality of associated parameters, so that the result of the accuracy of the pulse pressure variability can be fed back to the user, which is convenient for the user It can timely find the wrong value of PPV, thereby reducing the possibility of users misjudging the physiological state of the patient due to inaccurate PPV value. At the same time, it can also help clinical personnel to correct the cause of the inaccurate PPV value in time, so as to ensure the PPV parameter Accuracy of monitoring to better assist physicians in fluid management of patients.

For a thorough understanding of the present invention, detailed structures will be presented in the following description in order to explain the technical solutions proposed by the present invention. Alternative embodiments of the present invention are described in detail below, however, the invention is capable of other embodiments in addition to these detailed descriptions. Specifically, the monitoring device and the method for determining the accuracy of pulse pressure variability of the present application will be described in detail below with reference to the accompanying drawings. The features of the embodiments and implementations described below may be combined with each other without conflict.

As an example, the monitoring device of the embodiment of the present application obtains the physiological parameters of the object connected to it, and the monitoring device of the present application may be a bedside monitor, a central station, a PC installed and running monitoring software, and the like. The monitoring equipment can also be a ventilator, a room round machine, etc. The ventilator or room round machine can obtain the required parameter information from a monitor or other information systems, and then judge the accuracy of the PPV. The following embodiments mainly take a bedside monitor as an example to describe the present application.

The monitoring device 100 may include one or more processors 101, one or more sensors 102, a display 103, a memory 104, a communication interface, and the like. These components are interconnected by a bus system and/or other form of connection mechanism (not shown). It should be noted that the components and structures of the monitoring device 100 shown in FIG. 1 are only exemplary and not restrictive, and the monitoring device 100 may also have other components and structures as required.

The monitoring device 100 has an independent housing, and the housing panel has a sensor interface area, in which a plurality of sensor interfaces are integrated for connection with external various physiological parameter sensor accessories (not shown). The sensor is used to detect the physiological parameters (also referred to as vital sign parameters) of the object to which the monitoring device is connected (that is, the target object). For example, the physiological parameters include at least one of the following parameters: blood pressure, respiration rate, heart rate, body temperature, pulse rate, blood pressure Oxygen saturation, cardiac output, end-tidal carbon dioxide, EEG, ECG, etc. In one example, the monitoring device can also be used to determine the pulse pressure variability of the subject to which the monitoring device is connected, and output an electrical signal characterizing the pulse pressure variability.

The monitoring device 100 further includes a signal acquisition circuit 102 corresponding to each physiological parameter, a front-end signal processing circuit (not shown), and the like. The signal acquisition circuit 102 is used to acquire vital sign signals of the target object. The signal acquisition circuit 102 can be selected from an electrocardiogram circuit, a breathing circuit, a body temperature circuit, a blood oxygen circuit, a non-invasive blood pressure circuit, an invasive blood pressure circuit, etc. These signal acquisition circuits are respectively electrically connected to the corresponding sensor interfaces for electrical connection. The output end of the sensor accessories corresponding to different physiological parameters is coupled to the front-end signal processor, the communication port of the front-end signal processor is coupled to the processor 101, and the processor 101 is electrically connected to the external communication and power interface. The processor 101 may be configured to process the vital sign signal collected by the signal collection circuit 102 to obtain the vital sign parameter of the target object.

Various physiological parameter measurement circuits can use common circuits in the prior art, and the front-end signal processor completes the sampling and analog-to-digital conversion of the output signal of the signal acquisition circuit, and outputs a control signal to control the measurement process of the physiological signal. In a possible implementation manner, the sensors may be separated from each other or integrated into one body, or some sensors may be separated from each other and some sensors may be integrated into one body. The integration may be that multiple different sensing modules are respectively integrated on the same circuit board, or multiple sensing functions may be integrated into one circuit, etc., which is not limited in the present disclosure.

The memory 104 is used for storing various data and executable programs generated during the monitoring of the target object by the related monitoring device, for example, for storing system programs of the monitoring device, various application programs or algorithms for implementing various specific functions. One or more computer program products may be included, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and/or cache memory, among others. Non-volatile memory may include, for example, read only memory (ROM), hard disk, flash memory, and the like. During the process of monitoring the target object by the monitoring device, if data needs to be stored locally, it can be stored in the memory 104 .

The processor 101 may be a central processing unit (CPU), a graphics processing unit (GPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other form of processing with data processing capabilities and/or instruction execution capabilities unit, and can control other components in the monitor to perform desired functions. For example, processor 101 can include one or more embedded processors, processor cores, microprocessors, logic circuits, hardware finite state machines (FSMs), digital signal processors (DSPs), graphics processing units (GPUs) or their combination.

The processor 101 of the monitoring device 100 of the present application is further configured to: process the data of the vital sign parameters to obtain the pulse pressure variability of the target subject. The pulse pressure variability PPV can usually be the ratio of the difference between the maximum pulse pressure and the minimum pulse pressure to the average value of the pulse pressure in the respiratory cycle. Alternatively, the average pulse pressure can be the average value of the maximum pulse pressure and the minimum pulse pressure, The pulse pressure is the difference between the systolic blood pressure and the diastolic blood pressure of a single heartbeat. The processor 101 can analyze the relevant data of the vital sign parameters such as blood pressure (the blood pressure can be invasive arterial blood pressure or non-invasive arterial blood pressure) Perform calculation processing to obtain the pulse pressure in each breathing cycle, and then calculate the ratio of the difference between the maximum pulse pressure and the minimum pulse pressure to the average value of the pulse pressure in each breathing cycle to obtain the pulse pressure variability. The processor 101 may also obtain the pulse pressure variability PPV based on other methods. It is worth mentioning that the calculation of the PPV parameter is calculated according to the pulse pressure in one breathing cycle, and it is refreshed in a preset time period. Therefore, the processor 101 can process the data of the vital sign parameters in real time to obtain The pulse pressure variability of the target object, the display 103 displays the PPV parameters in real time, or, if multiple breathing cycles are included in the preset time period, multiple PPV parameters can also be calculated based on the vital sign parameters in the multiple breathing cycles, and then Find the average.

The processor 101 is further configured to: control the display of a menu window on the display 103 according to the second user instruction when acquiring the second user instruction input by the user through the first key, the first key is set in the hot key area of the display 103, the The first button can be, for example, a blood pressure measurement button (such as an NIBP measurement button or an IBP measurement button, etc.), the monitoring device of the present application includes a display 103, and a switch button for turning on or off the PPV detection and accuracy analysis functions is provided on the display 103. in the displayed menu window. Or, in other examples, a switch button for enabling or disabling the PPV detection and accuracy analysis functions is provided in the hot key area of the display 103 .

In one example, the processor 101 is configured to: obtain a first user instruction input by a user through a switch button; and start or end processing the data of vital sign parameters according to the first user instruction, so as to obtain the pulse pressure variation of the target subject By setting the switch button, it is convenient to start the detection of PPV parameters and the analysis of its correctness according to user needs. Optionally, the processor 101 can also process the data of the vital sign parameters in response to detecting that the PPV parameter switch is turned on, so as to obtain the pulse pressure variability of the target object, and perform subsequent evaluation of the accuracy of the pulse pressure variability. analysis, etc.

The processor 101 of the monitoring device 100 of the present application is further configured to: acquire multiple associated parameters of the target object that represent the accuracy of the pulse pressure variability. The multiple associated parameters can be any parameters that can affect the accuracy of the PPV. Optional Typically, the plurality of associated parameters include tidal volume when the target subject is mechanically ventilated, the target subject's heart rate, the target subject's respiration rate, and the target subject's electrocardiographic parameter data, or may also include other data that can affect accuracy such as pulse pressure variability. sex-related parameters. Among them, the heart rate and ECG parameter data of the target object are acquired by the monitoring equipment in real-time detection during the monitoring process.

The monitoring device can acquire a plurality of associated parameters of the target object that can affect the accuracy of the pulse pressure variability through any suitable method. For example, the monitoring device is connected to a ventilator that performs mechanical ventilation on the target object through a communication interface, and the processor 101 Used for: Obtaining tidal volume and/or respiratory rate from the ventilator via the communication interface.

In another example, the monitoring device 100 may further include a respiratory mechanics module, which is used to measure a parameter signal related to the tidal volume of the target subject during mechanical ventilation, and output the parameter signal to the processor 101, The processor 101 can also be used to process the parameter signal related to the tidal volume to obtain the tidal volume.

For another example, for the respiratory rate (that is, the respiratory rate), the respiratory mechanics module of the monitoring device can also be used to measure a parameter signal related to the respiratory rate of the target subject during mechanical ventilation, and output the parameter signal to the processor 101. , the processor 101 can also be used to process the parameter signal related to the breathing rate to obtain the breathing rate. Alternatively, the processor 101 is further configured to: acquire electrocardiographic parameter data (eg, electrocardiogram) or blood oxygen saturation of the target object; perform arithmetic processing on the electrocardiographic parameter data or blood oxygen saturation to obtain the respiration rate of the target object. Since there is a correlation between the amplitude change of the ECG signal and the breathing movement, the ECG signal usually includes breathing information, so the ECG parameter data can be calculated based on any suitable method well known to those skilled in the art to obtain the target object’s data. The respiration rate, for example, can obtain respiration information such as respiration rate by analyzing the amplitude change of the ECG signal, or, the processor 101 can also obtain the respiration information (ECG-Derived Respiratory Signal, abbreviated as EDR) through the ECG signal. method or mixing signal division method, etc. to obtain respiratory information such as respiratory frequency. The processor 101 may also perform arithmetic processing on the data of blood oxygen saturation based on any suitable method to obtain the respiratory rate, which is not specifically limited herein.

In order to ensure the credibility of subsequent judgment results, the ventilator can also add gas leakage compensation and pipeline compliance compensation mechanisms; when calculating various parameters or identifying arrhythmias based on ECG parameter data, signal quality judgment and noise level evaluation mechanisms can be added. , in order to improve the calculation accuracy of the aforementioned parameters. Further, the processor 101 of the monitoring device 100 of the present application is further configured to: determine the accuracy of the pulse pressure variability based on a plurality of associated parameters, so as to feed back the result of the accuracy of the pulse pressure variability to the user, so as to facilitate the user to discover in time The value of PPV is wrong, thereby reducing the possibility of users misjudging the physiological state of the patient due to inaccurate PPV value. At the same time, it can also help clinical personnel to correct the cause of the inaccurate PPV value in time, so as to ensure the monitoring of PPV parameters. Accuracy to better assist physicians in fluid management of patients. The processor 101 may compare the plurality of associated parameters with their corresponding preset conditions to determine the accuracy of the PPV. For example, the processor 101 may determine the accuracy of the pulse pressure variability based on the plurality of associated parameters, including: judging the tidal determine whether the ratio of the heart rate to the respiratory rate of the target subject is in the second preset range; identify whether the target subject has arrhythmia events based on the ECG parameter data; and when the tidal volume is in the first preset range When the range, the ratio of the heart rate to the respiratory rate is within the second preset range, and the target object does not have arrhythmia events, the result of determining the accuracy of the pulse pressure variability is accurate, and when the tidal volume is not within the first preset range, And/or the ratio of heart rate value to respiratory rate is not within the second preset range, and/or the target object has arrhythmia events, the result of determining the accuracy of the pulse pressure variability is doubtful, and the accuracy is doubtful, it reflects the results of PPV may not be accurate.

The first preset range can be any suitable range that can ensure the accuracy of PPV. For example, the first preset range is greater than or equal to 8ml/kg, that is, when measuring PPV, in order to ensure that the result is accurate, the tidal volume needs to be greater than or equal to 8 ml/kg. Equal to 8ml/kg.

The second preset range can be any suitable range that can ensure the accuracy of PPV. For example, the second preset range is greater than or equal to 4, that is, when measuring PPV, in order to ensure accurate results, the ratio of heart rate to respiratory rate should be greater than or equal to 4.

In one example, the processor 101 identifies whether the target object has arrhythmia events based on the ECG parameter data. The arrhythmia events include but are not limited to ventricular fibrillation, ventricular tachycardia, or asystole. A suitable method is used to identify the ECG parameter data to determine whether there is an arrhythmia event. For example, the processor can use machine learning or deep learning methods (for example, it can be based on a neural network model) to identify and classify ECG signals to identify arrhythmia events. Optionally, the processor 101 may analyze and identify the ECG parameter data in a preset time period (for example, the preset time period may be 1 s, 2 s, 3 s or other suitable time periods) to determine arrhythmia events.

The combined system of the monitoring equipment and the ventilator, through the processor of the monitoring equipment, conducts real-time analysis on the above 3 indicators of tidal volume, the ratio of heart rate and respiration rate, and the presence of arrhythmia events, so as to prevent misleading PPV parameter values from misleading clinical judgments.

The monitoring device 100 of the present application further includes a display 103, and the display is at least used to display the data of the vital sign parameters on the display interface. In order to facilitate the user to obtain various key information, various information may be displayed in different areas. For example, as shown in FIG. 2 , the display interface 300 may include a first parameter area for displaying vital sign parameter data and a first parameter area for displaying vital sign parameter data. The prompt information area 302 for alarm information or prompt information (also called an alarm display area). The first parameter area may include a waveform area 303 (for example, a waveform for displaying one or more types of vital sign parameters, including but not limited to electrocardiogram (ECG), blood oxygen saturation, respiration (Resp), mean arterial blood pressure (arterial pressure, ART), etc.), a waveform parameter area 304 (for displaying the data of the vital sign parameters corresponding to the waveform), a non-waveform parameter area 305 (for example, for displaying the data of the following physiological parameters of the monitored object: body temperature) , non-invasive blood pressure NIBP, pulse rate PR, vital sign parameters at one or more moments (such as heart rate HR, blood oxygen saturation, respiratory rate, blood pressure BP), etc. The display interface may also include other display areas, such as Patient information area 301 for displaying patient information (for example, displaying the type of patient, such as adult, child, neonatal, etc.), equipment prompt information area 306 (for example, prompt information area for displaying function attributes, function settings, and function keys) One or more, such as for displaying wireless information, volume information, battery information, etc.), hotkey area 307 (ie, the navigation area, in which one or more hotkeys are displayed, such as review, standby, alarm settings, main menu, alarm reset, alarm pause, NIBB start/stop, NIBP measurement, NIBP stop all, IBO zero calibration, etc.), various function keys can be icons and/or text function keys, the user can click the hot key in the hot key area To achieve the corresponding function, for example, click the alarm setting hot key to pop up the relevant setting window about the alarm-related settings. The layout of each of the above-mentioned display areas can be reasonably set according to actual needs. For example, the area with waveform parameters is located on one side of the waveform area, the hotkey area is set at the bottom of the display interface, and the area without waveform parameters is set between the smart hotkey area and the waveform area. The prompt information area 302 can be set at any suitable position on the display interface of the display 103, for example, the prompt information area 302 is located above or on one side of the area with waveform parameters, and for example, the prompt information area 302 is located above, below, or on the waveform area side. The second parameter area 308 is used to display the value of PPV, wherein the second parameter area 308 may be located outside the area with waveform parameters 304, or the second parameter area 308 may also be a sub-area of the area with waveform parameters 304, wherein The PPV can be calculated and obtained according to the mean arterial pressure, and therefore can be correspondingly displayed on the outside of the ART waveform. In one example, parameters such as pulse rate and pulse intensity can also be displayed in the second parameter area 308 .

In an example, the processor 101 is further configured to output corresponding prompt information according to the accuracy control, where the prompt information is used to represent whether the pulse pressure variability is accurate. For example, as shown in FIG. 2, the processor is further configured to: adjust the display form of the pulse pressure variability displayed on the display 103 according to the result of accuracy, so as to prompt the user, for example, when the result of accuracy is accurate, display The form is the first display form, and when the accuracy result is doubtful, the display form is the second display form, wherein the first display form is different from the second display form; the display 103 is used to display the data of vital sign parameters, and The display form shows the data of the pulse pressure variability, which is displayed by the monitor, prompting the user of the inaccuracy of the PPV parameter in time when necessary, helping the user to make corrections, and ensuring the accuracy of the PPV parameter monitoring, until the processor 101 monitors and analyzes to determine the When the PPV accuracy conditions are met, the normal display of PPV parameter values will be restored.

The combined system of the monitor and the ventilator performs background real-time analysis. If the analysis result that does not meet the PPV accuracy conditions is returned (that is, when the processor 101 analyzes and judges that the accuracy of the PPV is in doubt), use one of the following methods to perform an analysis in the monitor's A prompt is given on the display 103: the first display form and the second display form can be any suitable differentiated display forms for displaying the PPV value, for example, the first display form and the second display form have different fonts, and for example , the first display form and the second display form have different font colors, one of the first display form and the second display form is flashing display, and the other is non-flickering display; for example, the first display form and the second display form One of them is hollow to display the value of pulse pressure variability, and the other is solid to display the value of pulse pressure variability. For another example, the first display form and the second display form have different shading; One of the two display forms is highlighted display and the other is normal display. Continuing the example, the second display form includes replacing the value of the pulse pressure variability with a preset pattern. For example, the value of PPV can be displayed by an asterisk, a horizontal line (such as a double horizontal line or a single horizontal line), and when the PPV value is displayed. When the value is accurate, the value of PPV will be displayed directly, thus realizing a differentiated display.

In other examples, the first display form includes displaying the value of pulse pressure variability while displaying a first marker adjacent to the value of pulse pressure variability, and the second display form includes displaying the value of pulse pressure variability without displaying the first marker Or adjacent to the value of the pulse pressure variability to display a second mark that is different from the first mark, for example, when the accuracy of the value of the pulse pressure variability is questionable, the first mark such as an asterisk or other can be displayed outside the displayed PPV value. Any suitable mark can be used to mark, and when the value of PPV is accurate, only the value of PPV can be displayed without the first mark, or a second mark different from the first mark can be displayed adjacent to the value of PPV, For example, the first mark and the second mark are different patterns, or the first mark and the second mark are marks made in different numbers of the same pattern, and so on.

In one example, the monitor may also be provided with an alarm device, for example, the alarm device may alarm for abnormal vital sign parameters, or alarm for the condition of the monitored object, or when a connection occurs in each device of the monitor In the event of an abnormality, an abnormal working state, or the like, the processor 101 may generate alarm information (eg, an alarm signal). The alarm device is configured to give an alarm when the accuracy of the PPV value is in doubt, including but not limited to light, sound and other alarm methods, and the specific forms can be flashing LED lights, buzzers, speakers, etc. When the speaker is used, it can also output the prompt sound of the result of the numerical accuracy of the PPV, such as voice broadcast, etc., which meets the requirements for the strength of the alarm signal and is enough to arouse the attention and vigilance of the observer. In this way, real-time alarms can be realized to prompt users.

The processor 101 is further configured to output corresponding prompt information according to the accuracy control, where the prompt information is used to represent whether the pulse pressure variability is accurate. In an example, continuing as shown in FIG. 2 , the processor 101 is further configured to output corresponding prompt information according to the accuracy result, and the display 103 may display the prompt information in the adjacent area of the displayed PPV, for example, the display 103 may display the prompt information in the prompting The prompt information is displayed in the information area, or the prompt information can also be displayed in the second parameter area. Optionally, the prompt information includes a result of accuracy, and the result of accuracy may be accurate or in doubt, wherein, when the result is accurate, the corresponding prompt information may not be displayed, and only when the result of PPV accuracy is in doubt, the prompt information is displayed. , Optionally, the prompt information can also include the reason for judging the accuracy of PPV as the reason when the result is in doubt, and by outputting the result of the accuracy of PPV as the reason for the doubt, it can also help clinical personnel to timely carry out the cause of the inaccurate PPV value. Correction, so as to ensure the accuracy of PPV parameter monitoring, in order to better assist doctors in fluid management of patients.

In one example, the plurality of associated parameters include tidal volume when the target subject is mechanically ventilated, the target subject's heart rate, the target subject's respiratory rate, and the target subject's ECG parameter data, and the result of judging the accuracy of the PPV is in doubt. The reasons include one or more of the following reasons: the tidal volume is not in the first preset range, the ratio of the heart rate value to the respiratory rate is not in the second preset range, the target object has an arrhythmia event, wherein the target object has a heart rhythm Abnormal events are determined based on ECG parameter data of the target subject. For example, as shown in FIG. 2 , prompt information indicating that the accuracy of the PPV value is questionable is directly output in the prompt information area 302, and the reason for the inaccuracy is that the ratio of heart rate to respiratory rate is less than 4, which is lower than the first preset value. range, that is, below the normal range, which may result in inaccurate PPV values. For another example, the tidal volume, the ratio of heart rate to respiration rate, abnormal heart rate events, etc., can be directly displayed on the display interface of the display 103 to directly display the judgment results of not reaching the standard, or the first preset range corresponding to the tidal volume, the heart rate can also be displayed. The second preset range corresponding to the ratio of the breathing rate, and the ratio of the current tidal volume, the current heart rate to the breathing rate, are determined by the user according to these conditions.

In an example, the display 103 may also display prompt information in a differentiated display manner, such as highlighting, blinking, and the like. Optionally, when the reasons include multiple reasons, the display 103 is used to alternately display multiple reasons, so that the user can know in time the specific reasons that cause the inaccurate value of the PPV, and/or the display 103 can also be used to predict It is assumed that the display forms are differentiated to display multiple causes, for example, multiple causes may be displayed simultaneously, and multiple causes are displayed in different fonts and/or different colors and/or different shading, etc. respectively.

Further, in the embodiment of the present invention, the validity (also called accuracy) of the PPV parameter is judged in real time according to the aforementioned tidal volume, the ratio of heart rate and respiratory rate, and the ECG parameter data, and the processor 101 judges in the real-time monitoring process. Whether the PPV parameter switch is turned on or whether the PPV parameter needs to be displayed, if the switch is turned on or the PPV parameter needs to be displayed, the processor 101 judges the validity of the PPV parameter from the tidal volume, the ratio of the heart rate to the respiratory rate and the arrhythmia, etc., and finally The judgment result is prompted to the user. In some embodiments, the processor 101 can further determine whether the PPV parameter accuracy judging function is enabled, that is, the monitoring device can provide a PPV parameter switch and a PPV accuracy judging switch, the processor 101 can turn on the PPV parameter switch and the PPV accuracy is accurate. When the property judgment switch is turned on, the validity of the PPV parameters is judged, and the validity judgment result is prompted to the user.

In an example, a review button is set in the hot key area of the display 103, and the processor 101 is further configured to: obtain a review instruction input by the user through the review button, and based on the review instruction, display the pulse pressure variability on the review display interface of the display 103 historical data, in which the historical data of accurate pulse pressure variability and the historical data of doubtful pulse pressure variability are displayed in different ways (such as display in different colors, display in different fonts, display in different shading, etc.), optionally, when The historical data of the pulse pressure variability in question may also show reasons for questioning the accuracy of the historical data of the pulse pressure variability, and the like. Users can trace the data of PPV accuracy by recalling the historical data of pulse pressure variability.

To sum up, the monitoring device according to the present application can determine the accuracy of the pulse pressure variability based on a plurality of associated parameters, so as to feed back the result of the accuracy of the pulse pressure variability to the user, so as to facilitate the user to timely find out that the value of the PPV is incorrect, thereby It reduces the possibility of users misjudging the patient's physiological state due to inaccurate PPV values. At the same time, it can also help clinical staff to correct the causes of inaccurate PPV values in a timely manner, so as to ensure the accuracy of PPV parameter monitoring, so as to better Assists physicians in fluid management of patients.

In another embodiment of the present application, a monitoring device is provided for monitoring vital sign parameters of a target object, as shown in FIG. 1 , including: a signal acquisition circuit 102 for acquiring vital sign signals of the target object; The processor 101 is configured to process the vital sign signal to obtain the vital sign parameter of the target object; the processor 101 is further configured to: process the data of the vital sign parameter to obtain the monitoring used to characterize the volume responsiveness of the target object parameters; obtain multiple associated parameters of the target object that characterize the accuracy of the monitoring parameters; determine the accuracy of the monitoring parameters based on the multiple associated parameters, so as to feed back the results of the accuracy of the monitoring parameters to the user, so that the user can discover the monitoring parameters in time This reduces the possibility of users misjudging the patient's physiological state due to inaccurate monitoring parameters. At the same time, it can also help clinical staff to correct the causes of inaccurate monitoring parameters in a timely manner, so as to ensure the effectiveness of volume responsiveness monitoring. Accuracy to better assist physicians in fluid management of patients.

Optionally, the monitoring parameters include stroke volume variability and/or pulse pressure variability, or any other suitable monitoring parameters for characterizing the volume responsiveness of the target subject.

It is worth mentioning that the situation where the monitoring parameter is the pulse pressure variability has been explained and explained in the previous article, and for the specific details of the stroke volume variability, you can also refer to the previous description of the pulse pressure variability, which will not be repeated here. Describe them one by one.

Further, another embodiment of the present application also provides a monitoring device for monitoring vital sign parameters of a target object, as shown in FIG. 1 , including: a signal acquisition circuit 102 for collecting vital sign signals of the target object; The processor 101 is configured to process the vital sign signal to obtain the vital sign parameter of the target object; the processor 101 is further configured to: process the data of the vital sign parameter to obtain the monitoring used to characterize the volume responsiveness of the target object parameters; obtain the correlation features of the target object that characterize the accuracy of the monitoring parameters; determine the accuracy of the monitoring parameters based on the correlation features. Optionally, the associated feature of the target object includes the disease state of the target object. For example, the disease state of the target object can be obtained through user input or the disease state of the target object can be obtained through the electronic medical record of the target object.

The condition of the target subject refers to a condition that can affect the accuracy of monitoring parameters such as stroke volume variability and/or pulse pressure variability, for example, when the target subject has a pulmonary disease such as a pulmonary disorder , the numerical accuracy of stroke volume variability and/or pulse pressure variability cannot be guaranteed.

It is worth mentioning that, for some detailed descriptions of the monitoring device in the embodiments of the present application, reference may be made to the foregoing description, which will not be described one by one here.

The monitoring device of the embodiment of the present application can also determine the accuracy of monitoring parameters such as stroke volume variability and/or pulse pressure variability by acquiring the associated features of the target object, so as to feed back the result of the accuracy of pulse pressure variability to It is convenient for the user to find out that the value of the monitoring parameter is wrong in time, thereby reducing the possibility of the user misjudging the physiological state of the patient due to inaccurate monitoring parameters.

Next, with reference to FIG. 3, the method for determining the accuracy of pulse pressure variability of the present application will be described. The method can be based on the aforementioned monitoring device as the execution subject. On the premise of no conflict, each technical feature in this paper can be combined with each other.

As an example, as shown in FIG. 3 , the method for determining the accuracy of pulse pressure variability of the present application includes the following steps S310 to S350:

First, in step S310, the vital sign signal of the target object is acquired.

The monitoring device has one or more sensors, and the sensor detects the signal of the vital sign parameter of the object monitored by the monitoring device (that is, the target object). For example, the vital sign parameter includes at least one of the following parameters: blood pressure, respiration rate, heart rate, body temperature , pulse rate, blood oxygen saturation, cardiac output, end-tidal carbon dioxide, EEG, ECG parameter data such as ECG, etc. The monitoring device can also communicate with the ventilator to obtain various data detected by the ventilator, such as tidal volume, respiration rate, and the like.

Next, in step S320, the vital sign signal is processed to obtain the vital sign parameter of the target object. Various processing may be performed via the processor of the monitoring device to obtain vital sign parameters. For details, refer to the foregoing description.

Next, in step S330, the data of the vital sign parameters are processed to obtain the pulse pressure variability of the target object. The method for obtaining the pulse pressure variability can refer to the previous section.

In step S340, a plurality of associated parameters of the target object representing the accuracy of the pulse pressure variability are obtained; optionally, the plurality of associated parameters include tidal volume when the target object is mechanically ventilated, the target object's heart rate, the target object The respiration rate and the target subject's ECG parameter data, or other parameters that can affect the accuracy of the pulse pressure variability.

The multiple parameters associated with the target subject may be obtained by one or more of the following means, for example, obtaining tidal volume and/or respiratory rate from a ventilator mechanically ventilating the target subject; and/or, obtaining the target subject's heart rate. Electrical parameter data or blood oxygen saturation; perform arithmetic processing on the ECG parameter data or blood oxygen saturation to obtain the respiration rate of the target object. Or it can be other suitable ways.

In step S350, the accuracy of the pulse pressure variability is determined based on the plurality of associated parameters.

In one example, determining the accuracy of the pulse pressure variability based on multiple associated parameters includes: judging whether the tidal volume is within a first preset range, optionally, the first preset range is greater than or equal to 8ml/kg; judging the target Whether the ratio of the subject's heart rate to respiration rate is in the second preset range; optionally, the second preset range is greater than or equal to 4; whether the target subject has an arrhythmia event is identified based on the ECG parameter data; and when the tidal volume is in the first When a predetermined range, the ratio of the heart rate to the respiratory rate is in the second predetermined range, and the target object does not have arrhythmia events, the result of determining the accuracy of the pulse pressure variability is accurate. The result of determining the accuracy of the pulse pressure variability when the tidal volume is not within the first preset range, and/or the ratio of the heart rate value to the respiratory rate is not within the second preset range, and/or the target subject has an arrhythmic event in doubt.

When the result of determining the accuracy of the pulse pressure variability is doubtful, prompt information can also be output, such as adjusting the display form of the pulse pressure variability displayed on the display according to the accuracy result, wherein the display is used to display the data of vital sign parameters , and data showing pulse pressure variability in display form. In an example, when the result of accuracy is accurate, the display form is the first display form, and when the result of accuracy is doubtful, the display form is the second display form, wherein the first display form and the second display form have different fonts; and/or the first display form and the second display form have different font colors; and/or one of the first display form and the second display form is flashing and the other is not flashing; and /or one of the first display form and the second display form is a hollow to display the pulse pressure variability value, and the other is a solid one to display the pulse pressure variability value; and/or the first display form and the second display form have different bases and/or one of the first display form and the second display form is highlighted; and/or the first display form includes replacing the pulse pressure variability value with a specific pattern; and/or the first display form includes When the pulse pressure variability value is displayed, the first marker is displayed adjacent to the pulse pressure variability value, and the second display form includes displaying the pulse pressure variability value but not displaying the first marker or displaying the adjacent pulse pressure variability value different from the first marker. Second mark.

In another example, in addition to the above-mentioned change in the display form of the PPV as the prompt information, an additional prompt information may be output, or only the prompt information may be output, for example, the corresponding prompt information may be output according to the result of accuracy; display Data of vital sign parameters, data showing pulse pressure variability and prompt information. Optionally, the prompt information includes the result of accuracy, and the result of judging the accuracy is the reason when there is doubt. prompt.

In one example, the reason why the result of PPV accuracy is questionable may include one or more of the following reasons: tidal volume is not within a first preset range, and the ratio of heart rate value to respiratory rate is not within a second preset The scope and the target object have an arrhythmia event, wherein the target object has an arrhythmia event that is determined based on the ECG parameter data of the target object.

The method of this embodiment of the present application can also determine the accuracy of monitoring parameters such as stroke volume variability and/or pulse pressure variability by acquiring the associated features of the target object, so as to feed back the result of the accuracy of pulse pressure variability to the user , it is convenient for the user to find out that the value of the monitoring parameter is wrong in time, thereby reducing the possibility of the user misjudging the physiological state of the patient due to inaccurate monitoring parameters.

In addition, an embodiment of the present invention further provides a computer storage medium, on which a computer program is stored. One or more computer program instructions may be stored on a computer-readable storage medium, and the processor may execute the program instructions stored in the storage device to implement the functions (implemented by the processor) in the embodiments of the invention herein and/or other desired For example, to perform the corresponding steps of the method for determining the accuracy of pulse pressure variability according to an embodiment of the present invention, various application programs and various data, such as application program usage and data, may also be stored in the computer-readable storage medium. / or various data generated, etc.

For example, computer storage media may include, for example, memory cards for smartphones, storage components for tablet computers, hard drives for personal computers, read only memory (ROM), erasable programmable read only memory (EPROM), portable compact disk read only Memory (CD-ROM), USB memory, or any combination of the above storage media.

Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above-described example embodiments are exemplary only, and are not intended to limit the scope of the invention thereto. Various changes and modifications can be made therein by those of ordinary skill in the art without departing from the scope and spirit of the invention. All such changes and modifications are intended to be included within the scope of the invention as claimed in the appended claims.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or May be integrated into another device, or some features may be omitted, or not implemented.

In the description provided herein, numerous specific details are set forth. It will be understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it is to be understood that in the description of the exemplary embodiments of the invention, various features of the invention are sometimes grouped together , or in its description. However, this method of the invention should not be interpreted as reflecting the intention that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the corresponding claims reflect, the invention lies in the fact that the corresponding technical problem may be solved with less than all features of a single disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this invention.

It will be understood by those skilled in the art that all features disclosed in this specification (including the accompanying claims, abstract and drawings) and any method or apparatus so disclosed may be used in any combination, except that the features are mutually exclusive. Processes or units are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of different embodiments are intended to be within the scope of the invention within and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

Various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some modules according to the embodiments of the present invention. The present invention may also be implemented as apparatus programs (eg, computer programs and computer program products) for performing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such signals may be downloaded from Internet sites, or provided on carrier signals, or in any other form.

It should be noted that the above-described embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. do not denote any order. These words can be interpreted as names.

Claims (31)

1. A monitoring device for monitoring vital sign parameters of a target object, characterized in that it includes:

   The signal acquisition circuit is used to acquire the vital sign signal of the target object;

   a processor, configured to process the vital sign signal to obtain the vital sign parameter of the target object; the processor is further configured to:

   processing the data of the vital sign parameters to obtain the pulse pressure variability of the target object;

   obtaining a plurality of associated parameters of the target object that characterize the accuracy of the pulse pressure variability;

   Based on the plurality of associated parameters, the accuracy of the pulse pressure variability is determined.
2. 2. The monitoring device of claim 1, wherein the plurality of associated parameters include tidal volume during mechanical ventilation of the target subject, heart rate of the target subject, respiration rate of the target subject, and all Describe the ECG parameter data of the target object.
3. The monitoring device according to claim 2, wherein the monitoring device further comprises a communication interface, and the monitoring device is communicatively connected to a ventilator that performs mechanical ventilation on the target object through the communication interface, and the processing The device is configured to obtain the tidal volume and/or the respiratory rate from the ventilator through the communication interface.
4. The monitoring device according to claim 2, wherein the monitoring device further comprises a respiratory mechanics module,

   The respiratory mechanics module is configured to measure a tidal volume-related parameter signal of the target subject during mechanical ventilation, and the processor is configured to process the tidal volume-related parameter signal to obtain a tidal volume; and /or,

   The respiratory mechanics module is configured to measure the parameter signal related to the respiratory rate of the target object during mechanical ventilation, and the processor is configured to process the parameter signal related to the respiratory rate to obtain the respiratory rate.
5. The monitoring device of claim 2, wherein the processor is further configured to:

   Acquiring ECG parameter data or blood oxygen saturation of the target object;

   Perform arithmetic processing on the ECG parameter data or blood oxygen saturation to obtain the respiration rate of the target object.
6. The monitoring device of claim 2, wherein the processor determines the accuracy of the pulse pressure variability based on the plurality of associated parameters, comprising:

   judging whether the tidal volume is in a first preset range;

   judging whether the ratio of the heart rate to the breathing rate of the target object is within a second preset range;

   Identifying whether the target subject has an arrhythmia event based on the ECG parameter data; and

   When the tidal volume is in a first preset range, the ratio of the heart rate to the respiratory rate is in a second preset range, and the target object does not have arrhythmia events, determining the accuracy of the pulse pressure variability The result is accurate.
7. The monitoring device of claim 2, wherein the processor determines the accuracy of the pulse pressure variability based on the plurality of associated parameters, comprising:

   judging whether the tidal volume is in a first preset range;

   judging whether the ratio of the heart rate to the breathing rate of the target object is within a second preset range;

   Identifying whether the target subject has an arrhythmia event based on the ECG parameter data; and

   determining the pulse when the tidal volume is not within the first preset range, and/or the ratio of the heart rate value to the respiratory rate is not within the second preset range, and/or the target subject has an arrhythmia event The accuracy of the pressure variability results is questionable.
8. The monitoring device according to claim 6 or 7, wherein the first preset range is greater than or equal to 8ml/kg;

   The second preset range is greater than or equal to 4.
9. The monitoring device according to claim 1, wherein the monitoring device further comprises a display, and the processor is further configured to: adjust the display of the pulse pressure variability displayed on the display according to the result of the accuracy form;

   The display is used to display the data of the vital sign parameter and the data of the pulse pressure variability in the display form.
10. The monitoring device according to claim 9, wherein when the accuracy result is accurate, the display form is the first display form, and when the accuracy result is doubtful, the display form is a second display form, wherein the first display form and the second display form are different.
11. The monitoring device of claim 10, wherein the first display form and the second display form have different fonts; and/or

    the first display form and the second display form have different font colors; and/or

    One of the first display form and the second display form is a flashing display, and the other is a non-flickering display; and/or

    One of the first display form and the second display form is a hollow display pulse pressure variability value, and the other is a solid display pulse pressure variability value; and/or

    the first display form and the second display form have different shading; and/or

    one of the first display form and the second display form is highlighted; and/or

    The second display form includes replacing the value of the pulse pressure variability with a preset pattern; and/or

    The first display form includes displaying the value of the pulse pressure variability while displaying a first mark adjacent to the value of the pulse pressure variability, and the second display form includes displaying the value of the pulse pressure variability but The first marker is not displayed or a value adjacent to the pulse pressure variability displays a second marker distinct from the first marker.
12. The monitoring device according to claim 1, wherein the monitoring device further comprises a display, the processor is further configured to output corresponding prompt information according to the result of the accuracy, and the display interface of the display includes: A first parameter area, a second parameter area, a prompt information area, and a hot key area for displaying the data of the vital sign parameter, wherein the first parameter area includes a waveform for displaying the waveform of the vital sign parameter area and waveform parameter area, the second parameter area is used to display the value of the pulse pressure variability, the prompt information area is used to display the prompt information, or the second parameter area is also used to display all the the prompt information.
13. The monitoring device according to claim 12, wherein the prompt information includes the result of the accuracy and the reason for judging that the result of the accuracy is in doubt.
14. 14. The monitoring device of claim 13, wherein the plurality of associated parameters include tidal volume during mechanical ventilation of the target subject, heart rate of the target subject, respiration rate of the target subject, and all ECG parameter data of the target object, and the reasons include one or more of the following reasons: the tidal volume is not in the first preset range, the ratio of the heart rate value to the respiratory rate is not in the second preset range Scope, the target object has an arrhythmia event, wherein the target object has an arrhythmia event is determined based on the ECG parameter data of the target object.
15. The monitoring device according to claim 13, wherein when the reasons include multiple reasons, the display is used to alternately display the multiple reasons, and/or the display is used to display a preset Formal differentiation shows the various reasons.
16. The monitoring device according to claim 1, wherein the monitoring device comprises a display, the display interface of the display includes a hot key area, and a review button is arranged in the hot key area, and the processor further uses In: obtaining the review instruction input by the user through the review button, and based on the review instruction, the historical data of the pulse pressure variability is displayed on the review display interface of the display, wherein the accurate historical data of the pulse pressure variability and the doubtful ones are displayed. Historical data on pulse pressure variability are displayed in different ways.
17. A monitoring device for monitoring vital sign parameters of a target object, characterized in that it includes:

    a signal acquisition circuit for acquiring vital sign signals of the target object;

    a processor, configured to process the vital sign signal to obtain the vital sign parameter of the target object; the processor is further configured to:

    processing the data of the vital sign parameters to obtain monitoring parameters for characterizing the volume responsiveness of the target subject;

    obtaining a plurality of associated parameters of the target object that characterize the accuracy of the monitoring parameters;

    Based on the plurality of associated parameters, the accuracy of the monitoring parameters is determined.
18. 18. The monitoring device of claim 17, wherein the monitoring parameters include stroke volume variability and/or pulse pressure variability.
19. A monitoring device for monitoring vital sign parameters of a target object, characterized in that it includes:

    a signal acquisition circuit for acquiring vital sign signals of the target object;

    a processor, configured to process the vital sign signal to obtain the vital sign parameter of the target object; the processor is further configured to:

    processing the data of the vital sign parameters to obtain monitoring parameters for characterizing the volume responsiveness of the target subject;

    acquiring associated features of the target object that characterize the accuracy of the monitoring parameters;

    Based on the associated features, the accuracy of the monitoring parameter is determined.
20. 20. The monitoring device of claim 19, wherein the associated characteristic includes a medical condition of the target subject.
21. 21. The monitoring device of claim 20, wherein the disease condition of the target subject is that the target subject suffers from a pulmonary disorder.
22. A method for determining the accuracy of pulse pressure variability, characterized in that the method comprises:

    Obtain the vital sign parameters of the target object;

    processing the data of the vital sign parameters to obtain the pulse pressure variability of the target object;

    obtaining a plurality of associated parameters of the target object that characterize the accuracy of the pulse pressure variability;

    Based on the plurality of associated parameters, the accuracy of the pulse pressure variability is determined.
23. 23. The method of claim 22, wherein the plurality of associated parameters include a tidal volume when the subject is mechanically ventilated, a heart rate of the subject, a respiration rate of the subject, and the subject ECG parameter data of the target object;

    The acquiring a plurality of associated parameters of the target object representing the accuracy of the pulse pressure variability, including:

    obtaining the tidal volume and/or the respiratory rate from a ventilator mechanically ventilating the target subject;

    And/or, acquiring electrocardiographic parameter data or blood oxygen saturation of the target object; performing arithmetic processing on the electrocardiographic parameter data or blood oxygen saturation to obtain the respiration rate of the target object.
24. 24. The method of claim 23, wherein the plurality of associated parameters include tidal volume while mechanically ventilating the target subject, the target subject's heart rate, the target subject's respiration rate, and the target subject's respiration rate. The ECG parameter data of the target subject, the accuracy of determining the pulse pressure variability based on the plurality of associated parameters, including:

    judging whether the tidal volume is in a first preset range;

    judging whether the ratio of the heart rate to the breathing rate of the target object is within a second preset range;

    Identifying whether the target subject has an arrhythmia event based on the ECG parameter data; and

    When the tidal volume is in a first preset range, the ratio of the heart rate to the respiratory rate is in a second preset range, and the target object does not have arrhythmia events, determining the accuracy of the pulse pressure variability The result is accurate.
25. 23. The method of claim 22, wherein the plurality of associated parameters include tidal volume while mechanically ventilating the target subject, the target subject's heart rate, the target subject's respiration rate, and the target subject's respiration rate. The ECG parameter data of the target subject, the determination of the accuracy of the pulse pressure variability based on the plurality of associated parameters, including:

    judging whether the tidal volume is in a first preset range;

    judging whether the ratio of the heart rate to the breathing rate of the target object is within a second preset range;

    Identifying whether the target subject has an arrhythmia event based on the ECG parameter data; and

    determining the pulse when the tidal volume is not within the first preset range, and/or the ratio of the heart rate value to the respiratory rate is not within the second preset range, and/or the target subject has an arrhythmia event The accuracy of the pressure variability results is questionable.
26. The method of claim 24 or 25, wherein the first preset range is greater than or equal to 8ml/kg;

    The second preset range is greater than or equal to 4.
27. The method of claim 32, wherein the method further comprises: adjusting the display form of the pulse pressure variability displayed on a display according to the result of the accuracy, wherein the display is used to display the data of the vital sign parameter, and data of the pulse pressure variability in the display form.
28. The method of claim 27, wherein when the accuracy result is accurate, the display form is a first display form, and when the accuracy result is doubtful, the display display is as follows a second display form, wherein the first display form and the second display form have different fonts; and/or

    the first display form and the second display form have different font colors; and/or

    One of the first display form and the second display form is a flashing display, and the other is a non-flickering display; and/or

    One of the first display form and the second display form is a hollow display value of pulse pressure variability, and the other is a solid display value of pulse pressure variability; and/or

    the first display form and the second display form have different shading; and/or

    one of the first display form and the second display form is highlighted; and/or

    The first display form includes replacing the value of the pulse pressure variability with a specific pattern; and/or

    The first display form includes displaying a first marker adjacent to the pulse pressure variability value while displaying the pulse pressure variability value, and the second display form includes displaying the pulse pressure variability value but not displaying the first mark. A marker at or adjacent to the pulse pressure variability value displays a second marker that is distinct from the first marker.
29. The method of any one of claims 22 to 28, further comprising:

    Output corresponding prompt information according to the result of the accuracy;

    The data of the vital sign parameter, the data of the pulse pressure variability and the prompt information are displayed.
30. The method of claim 29, wherein the prompt information includes the result of the accuracy and the reason for judging the result of the accuracy as doubtful.
31. 31. The method of claim 30, wherein the plurality of associated parameters include tidal volume while mechanically ventilating the target subject, the target subject's heart rate, the target subject's respiration rate, and the target subject's respiration rate. ECG parameter data of the target object, the reasons include one or more of the following reasons: the tidal volume is not within the first preset range, the ratio of the heart rate value to the respiratory rate is not within the second preset range . The target object has an arrhythmia event, wherein the target object has an arrhythmia event that is determined based on ECG parameter data of the target object.

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