JP6455843B2 - 生理学的値を監視し処理するための装置およびその作動方法 - Google Patents
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Description
1.測定値と履歴時間窓にわたって測定される値とを比較することによって生体インピーダンス指標フラグを形成することができる。現在の時間窓における生体インピーダンスに基づく値、例えば流動状態が履歴値の平均を特定のパーセンテージ上回る或いは下回る場合には、生体インピーダンス指標フラグがアサートされる。フラグは、パーセンテージ差が減少する数時間でデアサートされ得る。例えば、生体インピーダンス流動状態値の48時間窓のメジアンと立ち下がり48時間窓のメジアンとを比較する。値間のパーセンテージ差が10%よりも大きい場合には、生体インピーダンス指標フラグがアサートされる。指標フラグは、パーセンテージ差が10%を下回った24時間後にデアサートされ得る。
2.前述の方法に基づいて心拍数指標フラグを形成することができ、その場合、移動窓に関してリスク数が形成される。移動窓リスク数が閾値(例えば、2)を超える場合には、HR指標フラグがアサートされる。指標フラグは、リスク数が所定の閾値を下回った後、数時間で、例えば24時間でデアサートされ得る。
3.前述した他の方法に基づいて心拍数指標フラグを形成することもでき、その場合には、閾値と比較した心拍数変動に基づいてリスクが測定される。心拍数変動が閾値、例えば100msを超える場合に指標フラグをアサーすることができ、また、心拍数変動が所定の閾値を下回った後、数時間で、例えば24時間でフラグをデアサートすることができる。
4.指標フラグの組み合わせ、例えば呼吸速度と姿勢に基づく指標フラグとの組み合わせは、移動窓呼吸速度リスク数に基づいて前述の心拍数指標フラグに類似する態様で形成され得る。移動窓呼吸速度リスク数を決定することができる(例えば、バンドk=3及びリスクバンドB={[<6brpm],[6〜20brpm],[>20brpm]}の数、及び、バンドR={2,1,2}ごとに割り当てられるリスク値を規定する)。前述したように呼吸速度指標フラグをアサート及びデアサートすることができる。患者が1日当たり所定時間未満を安静状態に費やす場合には、姿勢に基づくフラグをアサートすることができる。例えば、患者が1日の40%未満を背臥位安静姿勢に費やす場合には、指標フラグをアサートすることができる。組み合わされた指標フラグは、呼吸速度指標フラグ又は姿勢に基づく指標フラグのいずれかがアサートされるときにアサートされ得る。そのような組み合わされた指標フラグは、複数の個々の指標フラグに基づいてもよい。
5.不整脈リスクフラグを例えば心房性細動負荷に基づいて形成できる。例えば、24時間AF負荷が所定の閾値よりも大きく且つその24時間窓において手動オーバーリードにより少なくとも1つのAF発症が特定された場合には、AF負荷指標フラグをアサートできる。
Claims (8)
- 生理学的値を監視し処理するための装置であって、
患者の活動レベルおよび前記患者の身体姿勢を含む、患者の生理学的値を測定するように構成される3軸加速度計であって、x軸及びy軸が前記患者の身体平面上にあり、z軸が前記身体平面に対して垂直である、3軸加速度計と、
前記測定された生理学的値を受信するための1つ以上のプロセッサであって、該1つ以上のプロセッサが、少なくとも、前記3軸加速度計により測定された患者の活動レベルに基づいて患者安静状態を判定し、前記患者安静状態に基づいて前記身体姿勢の測定値をフィルタ処理し、該フィルタ処理は、患者が安静状態にない間に収集された身体姿勢の測定値を無視することを含む、1つ以上のプロセッサと、
を備える装置。 - 患者の追加の生理学的値を測定するように構成された心電図回路および1つ以上の生体インピーダンスセンサを更に含む請求項1に記載の装置であって、測定される生理学的値は、流動状態、心拍数、心拍リズム、呼吸速度、呼吸量、活動強度、及び、活動持続時間を更に含み、
前記1つ以上のプロセッサは、生理学的値をフィルタ処理し、前記フィルタ処理は、
患者が安静状態にない間に測定される心拍数を無視すること、
患者が安静状態にない間に測定される呼吸速度を無視すること、
患者が安静状態にない間に測定される呼吸量を無視すること、及び、
患者が安静状態にある間に測定される活動強度を無視すること、
のうちの1つ以上を備える、請求項1記載の装置。 - 生理学的値のフィルタ処理は、患者が安静状態にないときに採られた流動状態の測定値を無視することを含んでいない、請求項2に記載の装置。
- 請求項1に記載の装置の作動方法であって、
前記3軸加速度計が、患者活動レベルおよび前記患者の身体姿勢を含む、患者の1つ以上の生理学的値を測定するステップ(301)であって、x軸及びy軸が前記患者の身体平面上にあり、z軸が前記身体平面に対して垂直である、前記ステップ(301)と、
少なくとも、前記3軸加速度計により測定された前記患者活動レベルに基づいて、前記1つ以上のプロセッサが、患者安静状態を判定するステップ(302)であって、安静状態は安静状態にあるとき及び安静状態にないときを含む、前記ステップ(302)と、
前記1つ以上のプロセッサが、前記身体姿勢の測定値をフィルタ処理し、前記患者が安静状態にある間に測定された身体姿勢測定値だけを含めるように、患者が安静状態にない間に測定された値を無視する、ステップ(303)と、
を備える方法。 - 請求項2に記載の装置の作動方法であって、
前記3軸加速度計が、患者活動レベルおよび前記患者の身体姿勢を含む、患者の1つ以上の生理学的値を測定し、前記心電図回路が、心電図(ECG)記録を取得し、前記1つ以上の生体インピーダンスセンサが、生体インピーダンス測定値を得るステップ(301)であって、x軸及びy軸が前記患者の身体平面上にあり、z軸が前記身体平面に対して垂直であり、前記1つ以上の生理学的値は、流動状態、心拍数、心拍リズム、呼吸速度、呼吸量、活動強度、及び、活動持続時間を更に含む、前記ステップ(301)と、
少なくとも、前記3軸加速度計により測定された前記患者活動レベルに基づいて、前記1つ以上のプロセッサが、患者安静状態を判定するステップ(302)であって、安静状態は安静状態にあるとき及び安静状態にないときを含む、前記ステップ(302)と、
前記1つ以上のプロセッサが、前記身体姿勢の測定値をフィルタ処理し、前記患者が安静状態にある間に測定された身体姿勢測定値だけを含めるように、患者が安静状態にない間に測定された値を無視する、ステップ(303)と、
を備える、方法。 - 請求項2に記載の装置の作動方法であって、
前記1つ以上のプロセッサが生理学的値をフィルタ処理するステップを更に含み、前記フィルタ処理は、
患者が安静状態にない間に測定される心拍数を無視する工程、
患者が安静状態にない間に測定される呼吸速度を無視する工程、
患者が安静状態にない間に測定される身体姿勢を無視する工程、及び、
患者が安静状態にある間に測定される活動強度を無視する工程、
のうちの1つ以上を備える、方法。 - 前記1つ以上のプロセッサが生理学的値をフィルタ処理する前記ステップは、患者が安静状態にないときに採られた流動状態の測定値を無視する工程を含んでいない、請求項6に記載の方法。
- 前記1つ以上のプロセッサが患者安静状態を判定する前記ステップが、
z軸測定値の分布範囲、
x軸測定値及びy軸測定値に対する前記z軸測定値の相対的な大きさ、
前記x軸測定値の平方と前記y軸測定値の平方との和に対する前記z軸測定値の相対的な大きさ、
前記x軸測定値及び前記z軸測定値に対する前記y軸測定値の相対的な大きさ、及び、
前記x軸測定値の平方と前記z軸測定値の平方との和に対する前記y軸測定値の相対的な大きさ、
のうちの1つ以上を測定する工程を更に備える、請求項4〜7のいずれか一項に記載の方法。
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