JP2009531131A5 - - Google Patents

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JP2009531131A5
JP2009531131A5 JP2009502827A JP2009502827A JP2009531131A5 JP 2009531131 A5 JP2009531131 A5 JP 2009531131A5 JP 2009502827 A JP2009502827 A JP 2009502827A JP 2009502827 A JP2009502827 A JP 2009502827A JP 2009531131 A5 JP2009531131 A5 JP 2009531131A5
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hemodynamic stability
measurement
heart sound
ventricular
circuit
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Claims (15)

  1. 患者の心臓の機械的活動と関連した、少なくとも1つの心音を表す電気信号を生成するために操作可能な埋め込み型心音センサと、
    心音信号を生成するために前記心音センサに連結された心音センサインタフェース回路と、
    頻脈性不整脈検出器と、
    前記心音センサインタフェース回路と前記頻脈性不整脈検出器とに連結されたコントローラ回路と
    を含む埋め込み型医療装置(IMD)を含むシステムであって、
    前記コントローラ回路は、
    心室頻脈性不整脈の少なくとも1つの発症が被検者において検出されることを決定し、かつ
    自己相関関数を使用して、前記心音信号から前記心室頻脈性不整脈の血行動態安定性の測定を得、血行動態安定性の測定は大動脈圧の代理測定を含み
    前記血行動態安定性の測定に基づいて、前記心室頻脈性不整脈の間に血行圧力が安定しているか否か判断するように
    構成された血行動態安定性評価モジュールを含むシステム。
  2. 前記心音センサインタフェース回路は、試料採取された心音信号を得るためのサンプリング回路を含み、かつ
    前記血行動態安定性の測定は、血行動態パラメータHeを含み、
    ここで、
    Figure 2009531131
    であり、s n は測定された心音中に得られた心音信号のデジタル化された試料である請求項1に記載のシステム。
  3. 前記血行動態安定性評価モジュールは、心音信号から得られた血行動態安定性の前記測定のベースラインを確立するためのベースラインモジュールを含み、かつ
    前記血行動態安定性評価モジュールは、血行動態安定性の前記ベースライン測定からの測定された変化が規定の閾値を超える時、前記心室頻脈性不整脈を不安定であると見なすように更に構成される請求項1に記載のシステム。
  4. 前記ベースラインモジュールが、血行動態安定性の前記測定の中心傾向を決定することによって血行動態安定性の前記測定のベースラインを確立するように構成される請求項3に記載のシステム。
  5. 前記システムは、心室収縮間の心室時間間隔を提供するための前記コントローラ回路に連結されたタイマ回路を更に含み、
    前記血行動態安定性評価モジュールは、心室時間間隔の変動の測定を得るための心室収縮変動モジュールを含み、
    前記血行動態安定性モジュールは、前記心音信号から得られた血行動態安定性の前記測定のベースラインを確立するためのベースラインモジュールを含み、かつ
    血行動態安定性の前記ベースライン測定からの測定された変化が規定の安定性測定閾値を超え、かつ心室時間間隔の変動の前記測定が規定の変動閾値を超える両方の時、前記血行動態安定性評価モジュールは、前記心室頻脈性不整脈を不安定であると見なすように更に構成される請求項1に記載のシステム。
  6. 前記システムは、前記コントローラ回路に連結された衝撃回路を更に含み、かつ
    前記コントローラ回路は、前記血行動態安定性評価モジュールによって得られた血行動態安定性の前記測定に従って規定の衝撃刺激の付与を遅延させるように構成される請求項1に記載のシステム。
  7. 前記システムは、前記コントローラ回路に連結された抗頻脈性不整脈ペーシング(ATP)回路を更に含み、かつ前記コントローラ回路は、
    心室頻脈性不整脈発症を検出後、規定のATP療法を開始し、かつ
    血行動態安定性の前記測定に従って前記ATP療法の持続時間を延長するように構成される請求項1に記載のシステム。
  8. 前記コントローラ回路に連結された少なくとも1つの埋め込み型心臓信号感知回路を含み、前記埋め込み型心臓信号感知回路は、患者の心臓活動を表す電気心臓信号を生成するように構成され、かつ前記血行動態安定性評価モジュールは、前記電気心臓活動信号と相関する心音信号から血行動態安定性の前記測定を得るように構成される請求項1に記載のシステム。
  9. 前記コントローラ回路に連結された患者活動センサを含み、前記血行動態安定性評価モジュールは、患者活動と相関する心音信号から血行動態安定性の前記測定を得るように構成される請求項1に記載のシステム。
  10. 前記心音センサインタフェース回路は、
    低域フィルタ回路と、
    低域フィルタ処理した心音信号の高周波数に信号利得を加えるためのプリエンファシス回路とを含む請求項1に記載のシステム。
  11. 外部装置を含み、かつ前記IMDは、前記コントローラ回路に連結された通信回路を含み、かつ前記IMDは、心音信号から得られた少なくとも1つの血行動態安定性の測定に関する情報を外部装置に通信するように構成される請求項1に記載のシステム。
  12. 前記外部装置はIMDプログラマである請求項11に記載のシステム。
  13. 前記外部装置はネットワークと通信するサーバであり、かつ前記サーバは、第3の装置を介して前記IMDと通信するように構成される請求項11に記載のシステム。
  14. 心室収縮の間の心室時間間隔を与えるために、前記頻脈性不整脈検出器に接続されたタイマ回路を有し、
    前記頻脈性不整脈検出器は、平均心室収縮速度が、規定の速度閾値よりも大きく平均心房収縮速度を超えたとき、頻脈性不整脈が起こったことを宣言するように構成されている請求項1に記載のシステム
  15. 前記心音センサは、加速度計、ひずみ計、及びマイクロホンのうちの少なくとも1つを含む請求項1に記載のシステム
JP2009502827A 2006-03-29 2007-03-13 心音に基づく血行動態安定性の評価 Expired - Fee Related JP5166396B2 (ja)

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US11/277,773 2006-03-29
US11/277,773 US7780606B2 (en) 2006-03-29 2006-03-29 Hemodynamic stability assessment based on heart sounds
PCT/US2007/006345 WO2007126578A2 (en) 2006-03-29 2007-03-13 Hemodynamic stability assessment based on heart sounds

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