JP7404516B2 - パルス電界アブレーション中の異所性心電図信号を検出するためのシステム、装置、及び方法 - Google Patents
パルス電界アブレーション中の異所性心電図信号を検出するためのシステム、装置、及び方法 Download PDFInfo
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Description
本明細書では、不可逆電気穿孔法をもたらす電圧パルス波形の選択的且つ高速な印加による組織アブレーションに関連する異所性心臓活動を監視するために構成されたシステム及び装置が開示されている。一般に、ここで説明される組織をアブレーションするシステムは、ペーシング装置によって心臓に送達されるペーシング信号を発生させるための心臓刺激装置を備える。本システムは、異所性拍動の特定したり、心臓のペーシング捕捉を確認したりするために、電気的心臓活動を更に測定する。検出されたペーシング信号及び/又は検出された心臓活動は、1つ以上の電極を有するアブレーション装置に対して、信号発生器によって発生されたパルス波形を送達することを制御するために使用され得る。本明細書で説明されるように、本システム及び装置は、例えば心房細動などの心臓の病気を治療するために心外膜及び/又は心内膜に配備される。アノード及びカソードの電極の選択において独立にサブセットを選択できる状態で、電圧が電極の選択されたサブセットに印加される。
本明細書ではまた、上記のシステム及び装置を使用して心臓腔で実行される組織アブレーションプロセス中に異所性心臓活動を検出するための方法が説明される。心臓腔は、左心房腔であってもよく、その対応する肺静脈を含んでもよい。一般に、ここで説明する方法は、1つ以上の心臓腔に接触してペーシング装置(例えば、ペーシング装置(130)、ペーシング装置(210))を導入し、配置することを含む。ペーシング装置は、心臓活動を測定し、心臓刺激装置又は他のプロセッサ(例えば、心臓刺激装置(128)、制御部(908)、プロセッサ(1013))を使用して心臓にペーシング信号を送達し得る。測定された信号は、例えば本明細書で説明されるプロセッサ及び制御部によって、組織アブレーションを妨げ得るペーシング捕捉及び/又は異所性心臓活動を検出するために処理及び解析され得る。アブレーション装置(例えば、アブレーション装置(110)、アブレーション装置(220))は、1つ以上の肺静脈口又は腔領域と接触して導入され、配置され得る。パルス波形は、組織をアブレーションするためにアブレーション装置の1つ以上の電極(例えば、電極(112)、電極(222、224))によって送達され得る。いくつかの実施形態では、自律的に発生した異所性心臓活動の検出は、アブレーションエネルギー送達を迅速に中断させ、それにより不整脈(例えば、細動)を誘発するリスクを低減し得る。更に、(例えば、ペーシング装置(例えば、ペーシング装置(130)、ペーシング装置(210))によって送達される)心臓ペーシング信号は、送達されたパルス波の波形を心周期に同期させ得る。(例えば、不応期中に)ペーシング刺激に対してアブレーションエネルギーの送達を同期させることにより、細動などの不整脈を誘発するリスクを更に低減させ得る。
A1=(M1 1+M1 2+...M1 5)/5
A2=(M2 1+M2 2+...M2 5)/5
モーメントの平均値Anと所与のモーメントnのi番目の時間周期(例えば、5つの時間周期、i=1,2,...,5)のモーメント値との間の正規化された差が計算される。最初の3つのモーメント(n=1,2,3)について、次の一連の式がこの正規化された差を提供する。
Ti=|A1-M1 i|/A1
Ui=|A2-M2 i|/A2
ここで、Si、Ti、及びUiの値は、A0、A1、又はA2のうち対応する1つがゼロであるときに、ゼロに設定される。
Claims (9)
- パルス波を発生させて、前記パルス波をペーシングパルスのセットと同期させてアブレーション装置に送達するように構成された第1の制御部と、
第2の制御部であって、
ペーシングパルスの前記セットを発生させて、心臓の心臓刺激のためのペーシング装置にペーシングパルスの前記セットを送達し、
前記心臓の心臓信号データを受信し、
前記心臓信号データに基づいて前記心臓のペーシング捕捉を確認し、
前記心臓信号データに対応する周波数成分を解析することによって、前記心臓の異所性活動を監視し、
前記確認及び前記監視に基づいて、信号のセットを発生させて前記第1の制御部に送信するように構成された前記第2の制御部と
を備える、システム。 - 前記第2の制御部は、
ペーシングパルスの前記セットからの各ペーシングパルスの送達に続いて、前記心臓信号データのスライディングウィンドウを抽出することと、
前記スライディングウィンドウの周波数成分を取得するために前記スライディングウィンドウの離散フーリエ変換を実行することと、
前記スライディングウィンドウの前記周波数成分における周波数のサブレンジにわたってピーク周波数を特定することと、
前記ピーク周波数の解析に基づいて異所性活動があるか否かを判定することと
によって異所性活動を監視するように構成される、請求項1に記載のシステム。 - 前記第2の制御部は、各スライディングウィンドウについて、
前記スライディングウィンドウの前記周波数成分のナイキスト周波数までの周波数の最大振幅に対する該スライディングウィンドウにおける前記ピーク周波数の振幅の比を計算することと、
前記比が閾値よりも大きいか否かを判定することと、
によって異所性活動があるか否かを判定するように構成される、請求項2に記載のシステム。 - 前記第2の制御部は、
ペーシングパルスの前記セットからの連続するペーシングパルスのサブセットの送達に続いて、前記心臓信号データの部分を抽出することと、
各抽出部分について、前記抽出部分に対応する関数のモーメントのセットを計算することと、
各抽出部分について計算されたモーメントの前記セットに少なくとも基づいて、ペーシングパルスの前記セットのペーシング捕捉を確認することと、によってペーシング捕捉を確認するように構成される、請求項1に記載のシステム。 - 前記心臓信号データの各抽出部分は、連続するペーシングパルスの前記サブセットからのペーシングパルスの立ち上がりに続く所定の時間間隔内の心臓信号データを含む、請求項4に記載のシステム。
- 前記心臓の心臓刺激のための電極の第1のセットと、前記心臓信号データを捕捉するための電極の第2のセットとを含む前記ペーシング装置を更に備える、請求項1に記載のシステム。
- 前記パルス波を受信したことに応じて心臓組織をアブレーションするためにパルス電界を発生させるための電極のセットを含む前記アブレーション装置を更に備える、請求項1に記載のシステム。
- 信号の前記セットは、ペーシング捕捉を示す信号を含み、
前記第2の制御部は、ペーシング捕捉を確認したことに応じてペーシング捕捉を示す前記信号を発生させて送信するように構成される、請求項1に記載のシステム。 - 信号の前記セットは、異所性活動を示す信号を含み、
前記第2の制御部は、前記監視に基づいて異所性活動を検出したことに応じて異所性活動を示す前記信号を発生させて送信するように構成される、請求項8に記載のシステム。
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