JP6734391B2 - 心臓悪化イベントを検出するためのシステム - Google Patents
心臓悪化イベントを検出するためのシステム Download PDFInfo
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7271—Specific aspects of physiological measurement analysis
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- 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
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- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
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- A61B5/091—Measuring volume of inspired or expired gases, e.g. to determine lung capacity
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- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
- A61B5/686—Permanently implanted devices, e.g. pacemakers, other stimulators, biochips
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- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/7264—Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems
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- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7271—Specific aspects of physiological measurement analysis
- A61B5/7282—Event detection, e.g. detecting unique waveforms indicative of a medical condition
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- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
- A61N1/3627—Heart stimulators for treating a mechanical deficiency of the heart, e.g. congestive heart failure or cardiomyopathy
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
- A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential
- A61N1/36585—Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by two or more physical parameters
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H40/00—ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices
- G16H40/60—ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices for the operation of medical equipment or devices
- G16H40/63—ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices for the operation of medical equipment or devices for local operation
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H40/00—ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices
- G16H40/60—ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices for the operation of medical equipment or devices
- G16H40/67—ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices for the operation of medical equipment or devices for remote operation
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
- G16H50/20—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for computer-aided diagnosis, e.g. based on medical expert systems
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
- G16H50/30—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for calculating health indices; for individual health risk assessment
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/02—Stethoscopes
- A61B7/04—Electric stethoscopes
Description
いくつかの実施例では、リスク層別化回路400は、複数の候補融合モデルから融合モデルを選択することができる融合モデル選択子回路を含むことができ、またブレンド回路430は、選択された融合モデルに従って複合心臓リスク指示cRを生成することができる。融合モデルの選択は、心臓信号メトリックX1R、X2R、またはX3Rがそこから生成される1つまたは複数の生理学的信号の信号品質に基づくことができる。一実施例では、呼吸信号メトリックを用いる第1の候補融合モデルと、胸部インピーダンス信号メトリックを用いる第2の候補融合モデルとの間で、呼吸信号の信号対雑音比(SNR)が悪い場合、または所定の信号品質判定基準と比較して変動性が過度であるか、または所定値の範囲を実質的に逸脱している場合には、ブレンド回路430は、一次リスク指示と二次リスク指示とを結合するために、胸部インピーダンス信号メトリックを利用する第2の融合モデルに切り替えることができる。
本明細書において、用語「1つの」は、特許文献において一般的であるように、「少なくとも1つ」または「1つまたは複数」のあらゆる他の例または用法とは無関係に、1つ、または2つ以上を含むように用いられる。別段の指示がない限り、本明細書において、用語「または」は、非排他的であることを指すように、または、「AまたはB」が、「AであるがBではない」、「BであるがAではない」、および、「AおよびB」を含むように用いられる。本明細書において、用語「含む(including)」および「ここで(in which)」はそれぞれ、「備える、含む(comprising)」および「ここで(wherein)」という用語の平易な英語の同義語として用いられる。また、以下の特許請求の範囲においては、用語「含む(including)」および「備える、含む(comprising)」は、非限定的なものである。すなわち、特許請求の範囲においてこのような用語の後に列記されたものに加えて要素を含むシステム、デバイス、物品、組成物、配合物、またはプロセスは、やはりこうした特許請求の範囲内にあると見なされる。さらに、以下の特許請求の範囲において、用語「第1の」、「第2の」、および「第3の」等は、単にラベルとして用いられており、それらの対象に対して数的な要件を課すようには意図されていない。
Claims (15)
- 患者の心臓悪化イベントを検出するためのシステムであって、
第1の生理学的信号および第2の生理学的信号を感知するセンス増幅器回路を含むセンサ回路と、
前記第1の生理学的信号から第1の信号メトリックを、および前記第2の生理学的信号から第2の信号メトリックを生成するように構成された信号プロセッサ回路と、
前記患者の心臓リスクを示すリスク指示を生成するように構成されたリスク層別化回路と、
前記信号プロセッサ回路、および前記リスク層別化回路に結合された検出器回路であって、
少なくとも前記第1の信号メトリックを用いて、心臓悪化イベントの有無についての一次検出指示を生成し、
前記リスク指示を用いて前記第2の信号メトリックを調整し、
調整された前記第2の信号メトリックを用いて、心臓悪化イベントの有無についての二次検出指示を生成し、かつ、
前記一次検出指示および前記二次検出指示を用いて心臓悪化イベントを検出するように構成された検出器回路と、
を備えるシステム。 - 心臓悪化イベントの検出に応答して警報を発するように構成された出力回路をさらに備える、請求項1に記載のシステム。
- 前記第1の信号メトリックが心音信号メトリックを含み、前記第2の信号メトリックが呼吸信号メトリックを含み、
前記心音信号メトリックが第3の心音(S3)強度、または参照心音強度に対する第3の心音(S3)強度の比率を含み、かつ、
前記呼吸信号メトリックが呼吸数測定値、1回換気量測定値、または前記1回換気量測定値に対する前記呼吸数の比率を含む、請求項1または2に記載のシステム。 - 前記検出器回路が、前記一次検出指示および前記二次検出指示を含むデシジョンツリーを用いて心臓悪化イベントを検出するように構成され、
前記検出器回路が、前記デシジョンツリーに含まれるサブデシジョンツリーであって、前記リスク指示、および調整された前記第2の信号メトリックを含むサブデシジョンツリーを用いて前記二次検出指示を生成するように構成されている、請求項1〜3のいずれか一項に記載のシステム。 - 前記センサ回路が第3の生理学的信号を感知する第3のセンス増幅器回路をさらに含むとともに、前記サブデシジョンツリーが前記第3の生理学的信号に基づく検出をさらに含み、かつ、
前記検出器回路が、
前記第2の生理学的信号に基づく判定が心臓悪化イベントの非検出を示す場合には、前記第3の生理学的信号に基づく前記検出を用いて前記二次検出指示を生成するようにさらに構成された、請求項4に記載のシステム。 - 前記一次検出指示または前記二次検出指示のうちの少なくとも1つが、2つ以上の信号メトリックのブール論理結合もしくはファジー論理結合を含むか、または
前記リスク指示が、2つ以上のリスク指示のブール論理結合もしくはファジー論理結合を含む、請求項1〜5のいずれか一項に記載のシステム。 - 前記検出器回路が、
前記第1の信号メトリックと、前記リスク指示によって調整された前記第2の信号メトリックとの結合を用いて、複合信号傾向を生成し、かつ、
所定の条件を満たす前記複合信号傾向に応答して心臓悪化イベントを検出するように構成された、請求項1〜6のいずれか一項に記載のシステム。 - 前記第2の信号メトリックの調整が、前記リスク指示によって重み付けされた前記第2の信号メトリックの時間的な変化を含む、請求項7に記載のシステム。
- 前記第2の信号メトリックの調整が、前記リスク指示が所定の条件を満たすとサンプリングされる前記第2の信号メトリックの時間的な変化を含む、請求項7に記載のシステム。
- 前記第2の信号メトリックが、前記第1の信号メトリックよりも心臓悪化イベントに対する感度が高く、かつ、特異度が低い、請求項1〜9のいずれか一項に記載のシステム。
- 請求項1に記載のシステムであって、
前記リスク指示は複合心臓リスク指示を含み、
前記リスク層別化回路は、
少なくとも前記第1の信号メトリックを用いて一次心臓リスク指示を生成し、
少なくとも前記第2の信号メトリックを用いて二次心臓リスク指示を生成し、かつ、
前記一次心臓リスク指示および前記二次心臓リスク指示の両方を用いて前記複合心臓リスク指示を生成するように構成されたシステム。 - 前記信号プロセッサ回路が、第1および第2の生理学的信号とは異なる第3の生理学的信号を受信し、前記第3の生理学的信号から第3の信号メトリックを生成するように構成されており、
前記リスク層別化回路が、前記第3の信号メトリックが所定の条件を満たしている期間中に、前記第2の信号メトリックの複数の測定値を用いて二次心臓リスク指示を生成する、請求項11に記載のシステム。 - 前記信号プロセッサ回路が、前記第1の信号メトリックの第1の複数の測定値および前記第2の信号メトリックの第2の複数の測定値を生成し、
前記リスク層別化回路が、
前記第1の信号メトリックの前記第1の複数の測定値の第1の統計値を含む前記一次心臓リスク指示、および前記第2の信号メトリックの前記第2の複数の測定値の第2の統計値を含む前記二次心臓リスク指示を生成し、かつ、
前記第1の信号メトリックの前記第1の統計値と、前記第2の信号メトリックの前記第2の統計値との結合を用いて、前記複合心臓リスク指示を生成する、請求項11または12に記載のシステム。 - 前記第1の生理学的信号および前記第2の生理学的信号の信号品質に基づいて、複数の候補融合モデルから融合モデルを選択するように構成された融合モデル選択子回路をさらに備え、
前記リスク層別化回路が、選択された融合モデルに従って前記一次心臓リスク指示および前記二次心臓リスク指示の両方を用いて、前記複合心臓リスク指示を生成するように構成された、請求項11〜13のいずれか一項に記載のシステム。 - 前記リスク層別化回路が、シグモイド関数を用いて前記複合心臓リスク指示を変換するように構成された、請求項11〜14のいずれか一項に記載のシステム。
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US201662316905P | 2016-04-01 | 2016-04-01 | |
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PCT/US2017/024889 WO2017173014A1 (en) | 2016-04-01 | 2017-03-30 | Systems and methods for detecting worsening heart failure |
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EP (1) | EP3435862A1 (ja) |
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US11523778B2 (en) | 2016-04-01 | 2022-12-13 | Cardiac Pacemakers, Inc. | Systems and methods for detecting worsening heart failure |
US11883209B2 (en) | 2016-04-01 | 2024-01-30 | Cardiac Pacemakers, Inc. | Systems and methods for detecting worsening heart failure |
US11890116B2 (en) | 2016-04-01 | 2024-02-06 | Cardiac Pacemakers, Inc. | Systems and methods for detecting worsening heart failure |
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EP3435862A1 (en) | 2019-02-06 |
US11890116B2 (en) | 2024-02-06 |
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