CN112971753A - Identification method and device for fetal heart rate deceleration type and fetal monitoring equipment - Google Patents
Identification method and device for fetal heart rate deceleration type and fetal monitoring equipment Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02411—Detecting, measuring or recording pulse rate or heart rate of foetuses
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/43—Detecting, measuring or recording for evaluating the reproductive systems
- A61B5/4306—Detecting, measuring or recording for evaluating the reproductive systems for evaluating the female reproductive systems, e.g. gynaecological evaluations
- A61B5/4343—Pregnancy and labour monitoring, e.g. for labour onset detection
- A61B5/4362—Assessing foetal parameters
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- A—HUMAN NECESSITIES
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/725—Details of waveform analysis using specific filters therefor, e.g. Kalman or adaptive filters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2503/00—Evaluating a particular growth phase or type of persons or animals
- A61B2503/02—Foetus
Abstract
The invention relates to the technical field of medical instruments, in particular to a method and a device for identifying fetal heart rate deceleration type and fetal monitoring equipment, wherein the method comprises the following steps: acquiring maternal heart rate data and fetal heart rate data; carrying out coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain a coincidence part of the maternal heart rate data and the fetal heart rate data; setting data corresponding to the overlapped part in the fetal heart rate data as invalid data to obtain replaced fetal heart rate data; and identifying the deceleration type of the fetal heart rate according to the replaced fetal heart rate data. Through carrying out coincidence detection to maternal rhythm of heart data and fetal rhythm of heart data, before carrying out the speed reduction type discernment of fetal rhythm of heart, data with coincidence in the fetal rhythm of heart data are invalid data, just need not consider the data of this part when carrying out the discernment of speed reduction type, can avoid the influence of maternal rhythm of heart to the type discernment of fetal rhythm of heart speed reduction to improve the accuracy of the type discernment of fetal rhythm of heart speed reduction.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a method and a device for identifying fetal heart rate deceleration type and fetal monitoring equipment.
Background
Fetal heart rate not only can reflect the fetal survival condition, can judge fetal reserve capacity and health status moreover, along with the development of electronic technology, the production of fetal monitor lets people can be more accurate acquire fetal heart rate information. The fetal monitor is used for monitoring the fetus to acquire the fetal heart rate change condition, and meanwhile, data which are continuously traced are called fetal heart rate data. The fetal heart rate data is analyzed, and the deceleration type of the fetal heart rate can be identified. Fetal heart rate deceleration refers to a drop in fetal heart rate below a baseline level. In clinic, fetal heart rate deceleration is an important index for judging fetal safety risk and acid-base metabolism conditions, and can be classified according to the relationship between occurrence time and uterine contraction, for example, the deceleration types can be classified into early deceleration (deceleration occurring with uterine contraction synchronously), late deceleration (deceleration occurring with uterine contraction delay), mutation deceleration (deceleration having obvious sudden and no obvious relationship with uterine contraction) and prolonged deceleration (fetal heart rate decrease obviously lower than a baseline, and deceleration lasting for 2-10 min).
In the existing clinic, fetal heart rate data is mostly acquired by means of ultrasonic Doppler, abdominal wall electrocardio and the like. When the fetal heart rate is acquired in an ultrasonic Doppler mode, an ultrasonic probe is placed on the abdomen of a mother body to detect fetal heart signals; however, in addition to fetal heart movement, there are also maternal blood flow movement, fetal limb movement, etc. in the maternal abdomen, which are captured by the ultrasound probe and may interfere with fetal heart signal acquisition. For example, when the position where the ultrasonic probe is placed deviates from the fetal heart, the acquired frequency deviation signal is mainly generated by the blood flow motion of the maternal abdominal aorta, and the heart rate calculated according to the frequency deviation signal is the maternal heart rate, so that the identification accuracy of the fetal heart rate deceleration type is low, and further serious interference can be generated on the clinical judgment of a doctor. When the fetal heart rate is acquired by using an abdominal wall electrocardio mode, the discharge electrodes are attached around the fetal heart, so that the fetal electrocardio signal with larger amplitude can be acquired, and the maternal electrocardio signal amplitude can be inhibited as far as possible because the abdomen is far away from the maternal heart. Specifically, the fetal electrocardiosignals are transmitted to the surface of the mother body through various tissues of amniotic fluid and the mother body and are mixed with the maternal electrocardiosignals, the fetal electrocardiosignals are weak, and the amplitude and the form of the fetal electrocardiosignals are closely related to the gestational period, the body position, the impedance of the surface of the mother body and the like of the fetus. Generally, however, the larger the gestational week is, the larger the body surface fetus electrocardio amplitude is. However, in the late pregnancy, the detected fetal electrocardiosignal amplitude may be larger than the maternal electrocardiosignal amplitude, and at this time, the maternal electrocardiosignal may be identified as the fetal electrocardiosignal, so that the accuracy of the identified fetal heart rate deceleration type is low.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for identifying a fetal heart rate deceleration type, and a fetal monitoring device, so as to solve the problem of low accuracy of fetal heart rate identification.
According to a first aspect, an embodiment of the present invention provides a method for identifying a type of fetal heart rate deceleration, including:
acquiring maternal heart rate data and fetal heart rate data;
carrying out coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain a coincidence part of the maternal heart rate data and the fetal heart rate data;
setting data corresponding to the overlapped part in the fetal heart rate data as invalid data to obtain replaced fetal heart rate data;
and identifying the deceleration type of the fetal heart rate according to the replaced fetal heart rate data.
According to the identification method of the fetal heart rate deceleration type, the maternal heart rate data and the fetal heart rate data are subjected to coincidence detection, the data of a coincident part in the fetal heart rate data is set as invalid data before the deceleration type of the fetal heart rate is identified, the data of the coincident part does not need to be considered when the deceleration type is identified, the influence of the maternal heart rate on the identification of the fetal heart rate deceleration type can be avoided, and therefore the accuracy of the identification of the fetal heart rate deceleration type is improved.
With reference to the first aspect, in a first embodiment of the first aspect, the performing coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain a coincidence portion of the maternal heart rate data and the fetal heart rate data includes:
acquiring a time window with a first preset length;
sliding the time window on the maternal heart rate data and the fetal heart rate data by preset step length, and determining the difference value between each maternal heart rate data and the corresponding fetal heart rate data in the time window;
marking the fetal heart rate data of which the difference value is within a preset threshold value range as first suspicious coincidence data;
and obtaining the overlapped part according to the first suspicious overlapping data.
With reference to the first implementation manner of the first aspect, in a second implementation manner of the first aspect, the obtaining the coincident part according to the first suspicious coincident data includes:
counting the number of the first suspicious coincidence data in each time window;
determining a time window when the number of the first suspicious coincidence data meets a preset condition as a suspicious time window, and marking all fetal heart rate data in the suspicious time window as second suspicious coincidence data;
and obtaining the coincidence part based on the second suspicious coincidence data.
With reference to the second implementation manner of the first aspect, in a third implementation manner of the first aspect, the obtaining the coincident part based on the second suspicious coincident data further includes:
searching the fetal heart rate data for indicia of the second suspect coincidence data to determine coincident segments; wherein the coincident segments are a set of consecutive second suspect coincident data.
With reference to the second embodiment of the first aspect or the third embodiment, in a fourth embodiment of the first aspect, the identifying a deceleration type of the fetal heart rate from the replaced fetal heart rate data includes:
calculating a fetal heart rate data baseline and a uterine contraction data baseline based on the maternal heart rate data and the replaced fetal heart rate data;
detecting deceleration of the fetal heart rate and marking the initial position and the end position of the deceleration by using the fetal heart rate data baseline and the replaced fetal heart rate data;
detecting the initial position, the end position and the position of the highest peak point of the maternal uterine contraction by using the maternal heart rate data and the uterine contraction data baseline;
identifying a deceleration type of the fetal heart rate based on a correspondence between a position of deceleration of the fetal heart rate and a position where the uterine contraction occurs and a duration of deceleration of the fetal heart rate.
With reference to the third embodiment of the first aspect, in the fifth embodiment of the first aspect, the method further comprises:
counting the number of the overlapped segments;
when the number of the overlapped segments is larger than 0 and the deceleration number of the fetal heart rate is larger than 0, setting time windows with second preset lengths at the starting position of each deceleration and the ending position of each deceleration;
judging whether the length of the overlapped segment in the time window with the second preset length is greater than the preset length or not;
and when the length of the superposed segment in the time window with the second preset length is greater than the preset length, carrying out correction marking on the deceleration type of the fetal heart rate corresponding to the time window with the second preset length.
According to the identification method of the fetal heart rate deceleration type, provided by the embodiment of the invention, the deceleration type near the overlapped section is added with the correction mark, so that the requirement of further confirmation of the deceleration type can be visually shown, and the accuracy of deceleration type identification is improved.
With reference to the fifth embodiment of the first aspect, in a sixth embodiment of the first aspect, the flag for correcting the deceleration type corresponding to the time window with the second preset length includes:
and carrying out deceleration type correction on the deceleration with the correction mark, and updating the correction mark.
According to the identification method of the fetal heart rate deceleration type, after the deceleration with the correction mark is corrected by the deceleration type, the correction mark is updated to show that the deceleration type corresponding to the correction mark is corrected, and the subsequent processing is not needed again, so that the repeated processing of data is avoided.
According to a second aspect, an embodiment of the present invention further provides an apparatus for identifying a fetal heart rate deceleration type, including:
the acquisition device is used for acquiring maternal heart rate data and fetal heart rate data;
the coincidence detection device is used for performing coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain a coincidence part of the maternal heart rate data and the fetal heart rate data;
the data processing device is used for setting data corresponding to the overlapped part in the fetal heart rate data as invalid data so as to obtain replaced fetal heart rate data;
and the deceleration type identification device is used for identifying the deceleration type of the fetal heart rate according to the replaced fetal heart rate data.
According to the identification device for the fetal heart rate deceleration type, provided by the embodiment of the invention, the maternal heart rate data and the fetal heart rate data are subjected to coincidence detection, the data of the coincident part in the fetal heart rate data is set as invalid data before the deceleration type of the fetal heart rate is identified, the data of the coincident part does not need to be considered when the deceleration type is identified, the influence of the maternal heart rate on the identification of the fetal heart rate deceleration type can be avoided, and the accuracy of the identification of the fetal heart rate deceleration type can be improved.
According to a third aspect, embodiments of the present invention further provide a fetal monitoring device, including:
a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing therein computer instructions, and the processor executing the computer instructions to perform the method for identifying a type of fetal heart rate deceleration according to the first aspect of the present invention or any embodiment of the first aspect.
According to a fourth aspect, the present invention further provides a computer-readable storage medium storing computer instructions for causing a computer to execute the method for identifying a fetal heart rate deceleration type according to the first aspect of the present invention or any embodiment of the first aspect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method of identifying a type of fetal heart rate deceleration according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of identifying a type of fetal heart rate deceleration according to an embodiment of the present invention;
FIG. 3a is a schematic diagram of the recognition result of the deceleration type of the existing fetal heart rate;
FIG. 3b is a schematic diagram of the identification of the type of fetal heart rate deceleration according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method of identifying a type of fetal heart rate deceleration according to an embodiment of the present invention;
fig. 5 is a block diagram of a fetal heart rate deceleration type identification apparatus according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a hardware structure of a fetal monitoring device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the embodiment of the present invention, the maternal heart rate data and the fetal heart rate data are data of a maternal heart rate and a fetal heart rate detected at the same time; i.e. at the same time point, the maternal heart rate as well as the fetal heart rate are acquired. Maternal heart rate data and fetal heart rate data may also be understood as a set of maternal heart rates and fetal heart rates (i.e. a set of multiple heart rate data points) acquired at various points in time.
The maternal heart rate data and the fetal heart rate data can be represented in a curve form, an array form or other forms. For example, when representing maternal heart rate data as well as fetal heart rate data in the form of a curve, the heart rate amplitude of each data point on the curve at the corresponding time point, while the time interval between adjacent time points depends on the time interval at which the heart rate is sampled; when representing maternal heart rate data as well as fetal heart rate data in the form of an array, each element in the array is a heart rate amplitude at the corresponding point in time. The representation form of the data is not limited at all, and the fetal monitoring equipment is ensured to be capable of acquiring maternal heart rate data and fetal heart rate data.
Because in the actual clinical process, be subject to multiple factor, easily the mistake detects the maternal heart rate as the foetus heart rate, and usually the maternal heart rate is less than the foetus heart rate, when false detection the maternal heart rate as the foetus heart rate and last for a certain time, can be because the characteristics that the maternal heart rate is less than the foetus heart rate, detect the appearance of foetus heart rate deceleration. However, the deceleration of the fetal heart rate at this time is not the true deceleration of the fetal heart rate, may be a true deceleration, and may also be a false deceleration caused by the superposition of the fetal heart rates.
Based on the above, the embodiment of the invention uses the maternal heart rate as the auxiliary analysis information of the fetal heart rate deceleration type, and performs coincidence detection of the maternal heart rate and the fetal heart rate near the fetal heart rate deceleration. On the basis of the coincidence detection result, the data of the coincident part of the mother and the fetus is set as invalid data in the data of the heart rate of the fetus, and then the deceleration type of the heart rate of the fetus is identified.
In the following description, the data of the maternal-fetal coincidence is regarded as invalid data in the fetal heart rate data. The data of the overlapped part of the mother tire are divided into two types: one is a data point suspected of coinciding; the second is a coincident segment. The coincident segments are obtained on the basis of data points that are suspected to be coincident, and therefore, when setting invalid data, the data points that are suspected to be coincident may be set invalid, or the coincident segments may be set invalid. The identification of the fetal heart rate deceleration type in the embodiment of the invention can be identified in real time in the monitoring process, and can also be identified in the identification of the deceleration type in the follow-up process. Hereinafter, the identification method of the type of deceleration of the fetal heart rate will be described in detail.
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for identifying a type of fetal heart rate deceleration, it being noted that the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer executable instructions and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that presented herein.
In this embodiment, a method for identifying a fetal heart rate deceleration type is provided, which may be used in a fetal monitoring device, such as a monitor, and fig. 1 is a flowchart of a method for identifying a fetal heart rate deceleration type according to an embodiment of the present invention, and as shown in fig. 1, the flowchart includes the following steps:
and S11, acquiring maternal heart rate data and fetal heart rate data.
The maternal heart rate data and the fetal heart rate data can be acquired by a monitor in real time, and can also be stored in fetal monitoring equipment or acquired from the outside.
For example, the fetal monitoring data acquisition program can respectively acquire the maternal heart rate and the fetal monitoring data in real time after the monitoring device is started, the acquired data are put into a designated buffer area, and the fetal monitoring system program acquires the data from the buffer area to complete the analysis of the signal data, the heart rate calculation and the like.
The acquisition mode of maternal heart rate data and fetal heart rate data is not limited at all, and the fetal monitoring equipment is only required to be ensured to be capable of acquiring.
And S12, carrying out coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain a coincidence part of the maternal heart rate data and the fetal heart rate data.
When the fetal monitoring equipment performs coincidence detection, the difference value between the maternal heart rate and the fetal heart rate data of each time point can be compared, and if the difference value meets a certain threshold condition, the maternal heart rate and the fetal heart rate of the time point are considered to coincide. Of course, other means of coincidence detection are possible, as will be described in more detail below.
And S13, setting the data corresponding to the overlapped part in the fetal heart rate data as invalid data to obtain the replaced fetal heart rate data.
As mentioned above, the fetal heart rate data may be represented in the form of a curve, such that after the setting of invalid data, the continuous curve becomes a discontinuous curve, the invalid data remaining over a period of the curve to ensure that the time is continuous. The fetal heart rate data can also be expressed in the form of data, and the elements corresponding to the overlapped parts in the array can be empty, and the rest can be kept unchanged.
Alternatively, setting as invalid data may also be understood as rejecting data corresponding to the overlapping portion in the fetal heart rate data. For example, data points may be removed, as well as coincident segments.
The fetal monitoring device obtains the replaced fetal heart rate data after processing the fetal heart rate data, namely, the replaced fetal heart rate data does not have the superposition part of the maternal-fetal heart rate.
And S14, identifying the deceleration type of the fetal heart rate according to the replaced fetal heart rate data.
The fetal monitoring device can identify the deceleration type of the fetal heart rate after obtaining the replaced fetal heart rate data. Wherein, the identification of the deceleration type of the fetal heart rate also needs to be combined with the uterine contraction reflected by the maternal heart rate data.
If the detected deceleration occurs in synchronization with uterine contractions, the deceleration is considered early deceleration; if the detected deceleration occurs later than the contractions, the deceleration is considered to be late deceleration; if the detected deceleration has no obvious relative relation with the uterine contractions, the deceleration is considered as variant deceleration; if the detected deceleration duration is 2-10min, the deceleration is considered to be an extended deceleration.
The identification method of fetal heart rate deceleration type that this embodiment provided, through carrying out coincidence detection to maternal heart rate data and fetal heart rate data, before carrying out the deceleration type discernment of fetal heart rate, set the data of coincidence portion in the fetal heart rate data as invalid data, just need not consider this partial data when carrying out the discernment of deceleration type, can avoid the influence of maternal heart rate to fetal heart rate deceleration type discernment, can improve the accuracy of fetal heart rate deceleration type discernment.
In this embodiment, a method for identifying a fetal heart rate deceleration type is further provided, which may be used in a fetal monitoring device, such as a monitor, and fig. 2 is a flowchart of a method for identifying a fetal heart rate deceleration type according to an embodiment of the present invention, and as shown in fig. 2, the flowchart includes the following steps:
and S21, acquiring maternal heart rate data and fetal heart rate data.
Please refer to S11 in fig. 1, which is not described herein again.
And S22, carrying out coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain a coincidence part of the maternal heart rate data and the fetal heart rate data.
Specifically, the above S22 includes the following steps:
s221, acquiring a time window with a first preset length.
The fetal monitoring device may set a time window of a first preset length based on actual demand to analyze valid fetal heart rate data and maternal heart rate data within the time window.
S222, sliding a time window on the maternal heart rate data and the fetal heart rate data in a preset step length, and determining the difference value between each maternal heart rate data and the corresponding fetal heart rate data in the time window.
Taking the maternal heart rate data and the fetal heart rate data in a curve form as an example, as shown in fig. 3a, a time axis is taken as a coordinate axis of a maternal heart rate data curve and a fetal heart rate data curve, and the maternal heart rate and the fetal heart rate are respectively collected at the same time point to form a curve shown in fig. 3 a.
Sliding the time windows of the first preset length obtained in S221 on fig. 3a by preset steps, calculating the difference between each maternal heart rate data and the fetal heart rate data in each time window, for example, calculating the difference between the maternal heart rate and the fetal heart rate at time points 14:45:47 as shown in fig. 3 a.
Since each time window may include a plurality of time point corresponding heart rate data, a maternal heart rate to fetal heart rate difference value needs to be calculated for each time point corresponding heart rate data. Alternatively, it is also understood that each time window includes a plurality of data points of the maternal heart rate and a same number of data points of the fetal heart rate, and the difference between two data points is calculated at the same time point, i.e. the difference between each maternal heart rate data and the corresponding fetal heart rate data is obtained.
And S223, marking the fetal heart rate data with the difference value within the preset threshold range as first suspicious coincidence data.
The fetal monitoring device marks the fetal heart rate data of which the difference calculated in S222 is within a preset threshold range, and marks the data as first suspected coincidence data. Within the same time window, there may be a plurality of first suspected coincidence data, which may be continuous, discontinuous, or the like; of course, the first suspect coincidence data may not exist within the same time window.
The preset threshold range may be specifically set according to actual conditions, for example, set by medical staff according to actual experience, and the like.
S224, obtaining the overlapped part according to the first suspicious overlapping data.
And after the fetal monitoring equipment obtains the first suspicious coincidence data, processing the first suspicious coincidence data to obtain a coincidence part. The overlapping portion in S224 may be divided into the following two modes:
(a) data points
a.1) counting the number of first suspected coincidence data in each time window.
After the fetal monitoring device marks the first suspected coincidence data in each time window in S223, the fetal monitoring device may count the number of the first suspected coincidence data in each time window.
and a.2) determining that the time window when the number of the first suspected coincidence data meets the preset condition is a suspected time window, and marking all fetal heart rate data in the suspected time window as second suspected coincidence data.
The preset condition may be a preset number of the first suspected coincidence data, or a preset ratio of the suspected coincidence data to all fetal heart rate data points in the time window. For example, a time window in which the ratio of the first suspected coincidence data to all fetal heart rate data points in the time window is greater than a preset ratio may be determined as a suspected time window, and it may be considered that coincidence of the maternal heart rate and the fetal heart rate occurs in the time window.
After determining the suspected time window, the fetal monitoring device marks all fetal heart rate data within the time window as second suspected coincidence data.
After the first time window processing is completed, the fetal monitoring device then slides the time window backwards in steps S, and repeats the above S221-S224 until the time window slides to the last 1 data point of the fetal heart rate data and the maternal heart rate data.
a.3) obtaining the coincident portion based on the second suspect coincidence data.
The fetal monitoring device can directly regard the second suspicious overlapping data as the data of the overlapping part, and then can directly set the second suspicious overlapping data as invalid data.
(b) Coincident segments
Wherein the coincidence fragment is obtained based on the second suspected coincidence data, specifically, b.1) -b.2) is the same as a.1) -a.2) described above, so as to obtain the second suspected coincidence data.
b.3) searching the fetal heart rate data for a marker of the second suspect coincidence data to determine a coincident segment.
Wherein the coincident segments are a set of consecutive second suspect coincident data.
Specifically, the fetal monitoring device searches for a marker of second suspect coincidence data in the fetal heart rate data, and searches for a marker of second suspect coincidence data starting from a beginning segment of the fetal heart rate data. When the mark of the second suspicious coincidence data is searched, the mark of the second suspicious coincidence data is marked as the starting point of the coincidence segment to record the position information, the position is taken as the starting point to continue searching backwards, the first non-second suspicious coincidence data searched after the point is marked as the end point of the coincidence segment, and the end position of the coincidence segment is recorded. Then, the starting point and the ending point of the next overlapped segment are searched backwards from the ending position until the fetal heart rate data search is completed, so that all the overlapped segments and the corresponding starting and ending positions are obtained.
And S23, setting the data corresponding to the overlapped part in the fetal heart rate data as invalid data to obtain the replaced fetal heart rate data.
Corresponding to the two forms of the overlapped part, in the step, data corresponding to the overlapped part in the fetal heart rate data is set as invalid data, the second suspicious overlapped data can be directly set as invalid, or the overlapped segment is set as invalid data, so that the replaced fetal heart rate data can be obtained.
For the rest, please refer to S13 in the embodiment shown in fig. 1, which is not described herein again.
And S24, identifying the deceleration type of the fetal heart rate according to the replaced fetal heart rate data.
Before the fetal monitoring device identifies the deceleration type of the fetal heart rate by using the replaced fetal heart rate data, the replaced fetal heart rate data may be preprocessed, for example, the replaced fetal heart rate data is passed through a preset adaptive filter to eliminate interference data, so as to obtain clean fetal heart rate data, uterine contraction data and fetal movement data. Specifically, as shown in fig. 3a and 3b, 3 graphs from top to bottom are Fetal Heart Rate (FHR) data versus Maternal Heart Rate (MHR) data, prenatal uterine function (UA) data, and Automatic Fetal Movement (AFM) data. Specifically, the above S24 includes the following steps:
and S241, calculating a fetal heart rate data baseline and a uterine contraction data baseline based on the maternal heart rate data and the replaced fetal heart rate data.
After obtaining clean fetal heart rate data, contraction data and fetal movement data, the fetal monitoring device can calculate a fetal heart rate data baseline and a contraction data baseline. Wherein the fetal heart rate data baseline refers to the fetal heart rate recorded without fetal movement and without uterine contraction effects.
And S242, detecting deceleration of the fetal heart rate and marking the initial position and the end position of the deceleration by using the baseline of the fetal heart rate data and the replaced fetal heart rate data.
When the fetal monitoring device detects that the fetal heart rate data is below the baseline of the fetal heart rate data and meets the corresponding preset threshold condition, the fetal monitoring device can deem that a deceleration is detected and mark the starting position and the ending position of the deceleration.
And S243, detecting the initial position, the end position and the position of the highest peak point of the maternal uterine contraction by using the maternal heart rate data and the uterine contraction data baseline.
The fetal monitoring equipment detects the maternal uterine contraction data and calculates the initial ending time and the position of the highest peak point of the maternal uterine contraction.
And S244, identifying the deceleration type of the fetal heart rate based on the corresponding relation between the deceleration position of the fetal heart rate and the position where the uterine contraction occurs and the deceleration duration of the fetal heart rate.
The fetal monitoring equipment judges and marks the fetal heart rate deceleration type obtained by detection according to the position corresponding relation of the deceleration occurring in the uterine contraction and the duration of the deceleration. The specific method for judging and marking is as follows: if the detected deceleration occurs in synchronization with uterine contractions, the deceleration is considered early deceleration; if the detected deceleration occurs later than the contractions, the deceleration is considered to be late deceleration; if the detected deceleration has no obvious relative relation with the uterine contractions, the deceleration is considered as variant deceleration; if the detected deceleration duration is 2-10min, the deceleration is considered to be an extended deceleration.
As shown in fig. 3a and fig. 3b, fig. 3a shows the detection result of the fetal heart rate data without the maternal heart rate data as auxiliary reference information, and it can be seen that where the coincidence of the maternal heart rates occurs, a variant deceleration and a late deceleration are detected.
Fig. 3b shows the detection result of the same fetal heart rate data after the maternal heart rate is taken as the auxiliary reference information and the overlapping part is set as invalid data, and it can be seen that only one variation deceleration is detected at the position where the maternal heart rate is overlapped due to the maternal heart rate taken as the reference information.
In this embodiment, a method for identifying a fetal heart rate deceleration type is provided, which may be used in a fetal monitoring device, such as a monitor, and fig. 4 is a flowchart of a method for identifying a fetal heart rate deceleration type according to an embodiment of the present invention, and as shown in fig. 4, the flowchart includes the following steps:
s301, maternal heart rate data and fetal heart rate data are obtained.
Please refer to S21 in fig. 2 for details, which are not described herein.
S302, carrying out coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain a coincidence part of the maternal heart rate data and the fetal heart rate data.
Please refer to S22 in fig. 2 for details, which are not described herein.
And S303, setting data corresponding to the overlapped part in the fetal heart rate data as invalid data to obtain the replaced fetal heart rate data.
Please refer to S23 in fig. 2 for details, which are not described herein.
And S304, identifying the deceleration type of the fetal heart rate according to the replaced fetal heart rate data.
Please refer to S24 in fig. 2 for details, which are not described herein.
S305, counting the number of the overlapped segments.
The fetal monitoring device has derived coincident segments when calculating the coincident portions and has marked the start and end points of each coincident segment in S302. Then, the number of overlapping segments can be counted by using the starting point or the end point of each overlapping segment.
S306, judging whether the number of the overlapped segments is larger than 0 or not and whether the deceleration number of the fetal heart rate is larger than 0 or not.
After the fetal monitoring device identifies the deceleration type of the fetal heart rate in S305, the corresponding deceleration amount in the current fetal heart rate data can be obtained, and the deceleration amount can be counted.
Executing S307 when the number of the overlapped segments is greater than 0 and the deceleration number of the fetal heart rate is greater than 0; otherwise, S310 is performed.
And S307, setting a time window with a second preset length at the starting position of each deceleration and the ending position of each deceleration.
The length of the time window with the second preset length set by the fetal monitoring device may be specifically set according to actual situations, and is not limited herein.
S308, judging whether the length of the overlapped segment in the time window with the second preset length is larger than the preset length.
After setting the time window of the second preset length, the time window of the second preset length may include part of, or all of the overlapping segments described above, or may not include the overlapping segments described above.
The fetal monitoring device may determine whether the time window of the second preset length includes the coincidence segment by using the identifier of the start point or the end point of the coincidence segment. Regarding the length of the included coincidental segment, a search of data points in the coincidental segment can be made within a time window of the second preset length to determine the length.
When the length of the overlapped segment in the time window with the second preset length is greater than the preset length, the deceleration type corresponding to the time window with the second preset length is considered to need to be corrected, that is, S309 is executed; otherwise, S310 is performed.
S309, correcting and marking the deceleration type of the fetal heart rate corresponding to the time window with the second preset length.
The fetal monitoring device may add a modification flag to the deceleration type determined in S308 to require modification for subsequent modification.
And S310, outputting the identification result of the deceleration type.
Specifically, when the correction of the deceleration type is not required, the output deceleration type is the deceleration type identified in S304; when the deceleration type correction is required, the deceleration type with the correction flag may be output, or the deceleration type with the correction flag may be output after correction, or the like.
For example, the analysis result of the maternal and fetal monitoring determined after analysis and calculation is output to the monitoring system program, and the analysis result is put into a designated buffer area, and the monitoring system program acquires data from the buffer area to complete the functions of displaying, printing, storing and the like of the analysis result.
According to the identification method for the fetal heart rate deceleration type, the deceleration type of the coincident segment accessory is added with the correction mark, so that the requirement of further confirmation of the deceleration type can be visually shown, and the accuracy of deceleration type identification is improved.
As an optional implementation manner of this embodiment, after the step of S309 and before performing S310, the method further includes:
the deceleration with the correction flag is subjected to the deceleration type correction, and the correction flag is updated. Specifically, the deceleration type may be corrected for the correction flag in S309 and the fetal heart rate deceleration type identified in S304, and if the identified deceleration type is prolonged deceleration and the deceleration has the correction flag, the deceleration type is corrected to suspicious prolonged deceleration, and the correction flag is updated to indicate that the deceleration has been corrected. Similarly, if the identified deceleration type is another type of deceleration and the deceleration has a correction flag, the deceleration type is corrected to the corresponding suspected other type of deceleration and the correction flag is updated.
After the fetal monitoring device corrects the deceleration type of the deceleration with the correction mark, the fetal monitoring device updates the correction mark to indicate that the deceleration type corresponding to the correction mark is corrected, and then the fetal monitoring device does not need to process again, so that repeated processing of data is avoided.
In this embodiment, a device for identifying a fetal heart rate deceleration type is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, which have already been described and will not be described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
The present embodiment provides an apparatus for identifying a type of fetal heart rate deceleration, as shown in fig. 5, including:
and the obtaining module 41 is configured to obtain maternal heart rate data and fetal heart rate data.
A coincidence detection module 42, configured to perform coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain invalid data in the fetal heart rate data; wherein the invalid data is the superposition part of the maternal heart rate data and the fetal heart rate data.
And a data processing module 43, configured to remove the invalid data from the fetal heart rate data to obtain replaced fetal heart rate data.
And the deceleration type identification module 44 is used for identifying the deceleration type of the fetal heart rate according to the replaced fetal heart rate data.
The fetal heart rate deceleration type identification means in this embodiment is in the form of a functional unit, where the unit refers to an ASIC circuit, a processor and memory executing one or more software or fixed programs, and/or other devices that may provide the above-described functionality.
Further functional descriptions of the modules are the same as those of the corresponding embodiments, and are not repeated herein.
The embodiment of the invention also provides fetal monitoring equipment which is provided with the fetal heart rate deceleration type identification device shown in the figure 5.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a fetal monitoring device according to an alternative embodiment of the present invention, as shown in fig. 6, the fetal monitoring device may include: at least one processor 51, such as a CPU (Central Processing Unit), at least one communication interface 53, memory 54, at least one communication bus 52. Wherein a communication bus 52 is used to enable the connection communication between these components. The communication interface 53 may include a Display (Display) and a Keyboard (Keyboard), and the optional communication interface 53 may also include a standard wired interface and a standard wireless interface. The Memory 54 may be a high-speed RAM Memory (volatile Random Access Memory) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 54 may alternatively be at least one memory device located remotely from the processor 51. Wherein the processor 51 may be in connection with the apparatus described in fig. 5, the memory 54 stores an application program, and the processor 51 calls the program code stored in the memory 54 for performing any of the above-mentioned method steps.
The communication bus 52 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 52 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 6, but this is not intended to represent only one bus or type of bus.
The memory 54 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviated: HDD) or a solid-state drive (english: SSD); the memory 54 may also comprise a combination of the above types of memories.
The processor 51 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor 51 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
Optionally, the memory 54 is also used to store program instructions. The processor 51 may invoke program instructions to implement a method of identifying a type of fetal heart rate deceleration as illustrated in the embodiments of fig. 1 to 4 of the present application.
The embodiment of the invention also provides a non-transitory computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the identification method of the fetal heart rate deceleration type in any method embodiment. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A method for identifying a type of fetal heart rate deceleration, comprising:
acquiring maternal heart rate data and fetal heart rate data;
carrying out coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain a coincidence part of the maternal heart rate data and the fetal heart rate data;
setting data corresponding to the overlapped part in the fetal heart rate data as invalid data to obtain replaced fetal heart rate data;
and identifying the deceleration type of the fetal heart rate according to the replaced fetal heart rate data.
2. The method according to claim 1, wherein the detecting coincidence of the maternal heart rate data and the fetal heart rate data to obtain a coincidence of the maternal heart rate data and the fetal heart rate data comprises:
acquiring a time window with a first preset length;
sliding the time window on the maternal heart rate data and the fetal heart rate data by preset step length, and determining the difference value between each maternal heart rate data and the corresponding fetal heart rate data in the time window;
marking the fetal heart rate data of which the difference value is within a preset threshold value range as first suspicious coincidence data;
and obtaining the overlapped part according to the first suspicious overlapping data.
3. The method of claim 2, wherein said deriving the coincident portions from the first suspect coincidence data comprises:
counting the number of the first suspicious coincidence data in each time window;
determining a time window when the number of the first suspicious coincidence data meets a preset condition as a suspicious time window, and marking all fetal heart rate data in the suspicious time window as second suspicious coincidence data;
and obtaining the coincidence part based on the second suspicious coincidence data.
4. The method according to claim 3, wherein said deriving the coincident portions based on the second suspect coincidence data further comprises:
searching the fetal heart rate data for indicia of the second suspect coincidence data to determine coincident segments; wherein the coincident segments are a set of consecutive second suspect coincident data.
5. A method according to claim 3 or 4, wherein said identifying a type of deceleration of the fetal heart rate from the permuted fetal heart rate data comprises:
calculating a fetal heart rate data baseline and a uterine contraction data baseline based on the maternal heart rate data and the replaced fetal heart rate data;
detecting deceleration of the fetal heart rate and marking the initial position and the end position of the deceleration by using the fetal heart rate data baseline and the replaced fetal heart rate data;
detecting the initial position, the end position and the position of the highest peak point of the maternal uterine contraction by using the maternal heart rate data and the uterine contraction data baseline;
identifying a deceleration type of the fetal heart rate based on a correspondence between a position of deceleration of the fetal heart rate and a position where the uterine contraction occurs and a duration of deceleration of the fetal heart rate.
6. The method of claim 4, further comprising:
counting the number of the overlapped segments;
when the number of the overlapped segments is larger than 0 and the deceleration number of the fetal heart rate is larger than 0, setting time windows with second preset lengths at the starting position of each deceleration and the ending position of each deceleration;
judging whether the length of the overlapped segment in the time window with the second preset length is greater than the preset length or not;
and when the length of the superposed segment in the time window with the second preset length is greater than the preset length, carrying out correction marking on the deceleration type of the fetal heart rate corresponding to the time window with the second preset length.
7. The method according to claim 6, wherein said marking the modification of the deceleration type corresponding to the time window of the second preset length comprises:
and carrying out deceleration type correction on the deceleration with the correction mark, and updating the correction mark.
8. An apparatus for identifying a type of fetal heart rate deceleration, comprising:
the acquisition device is used for acquiring maternal heart rate data and fetal heart rate data;
the coincidence detection device is used for performing coincidence detection on the maternal heart rate data and the fetal heart rate data to obtain a coincidence part of the maternal heart rate data and the fetal heart rate data;
the data processing device is used for setting data corresponding to the overlapped part in the fetal heart rate data as invalid data so as to obtain replaced fetal heart rate data;
and the deceleration type identification device is used for identifying the deceleration type of the fetal heart rate according to the replaced fetal heart rate data.
9. A fetal monitoring device, comprising:
a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method for identifying a type of fetal heart rate deceleration according to any one of claims 1 to 7.
10. A computer-readable storage medium storing computer instructions for causing a computer to perform the method for identifying a type of fetal heart rate deceleration recited in any one of claims 1-7.
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