エレクトロカーディオグラフィー的に静かな60Hzの心内漏れ電流によって引き起こされる心血管崩壊. 電気安全への影響
C D Swerdlow1, W H Olson, M E O'Connor
1Division of Cardiology, Cedars-Sinai Medical Center, Los Angeles, CA, USA. swerdlow@ucla.edu
Circulation
|May 20, 1999
まとめ
心臓内漏れ電流 (50 microA) に対する現在の安全基準は,静脈脈動脈不全などの有害な影響がより低いレベルで発生する可能性があるため,患者を保護しない可能性があります. 連続捕獲の値に基づいて,20マイクロAの改訂された規格が提案されています.
科学分野:
- バイオメディカルエンジニアリング
- 心臓病学 心臓病学
- 医療機器の安全性 医療機器の安全性について
背景:
- 60Hzの心内漏れ電流の確立された安全基準は,単一の欠陥条件下では50 microAです.
- この規格は,交流電流 (AC) による患者の不快感を防ぐことを目的としています.
- 人間に最低限の危険なACレベルは未定のままです.
研究 の 目的:
- 埋め込み式心房変容器-除細動器試験を受ける患者の60Hz交流電流 (AC) の最低危険なレベルを決定する.
- 心内ACの心臓機能と患者の安全性への影響を評価する.
主な方法:
- 埋め込み心房変容器-除細動器検査を受ける40人の患者を研究した.
- プログラム可能な60HzACは5秒間隔で適用され,強度が増加しました.
- 2つの現在の経路がテストされました:双極性および単極性で,心室細動 (VF) または1mAに達するまで応答が監視されました.
主要な成果:
- 断続的な心室捕捉は20マイクロAで,継続的な捕捉は32マイクロAで,VFは49マイクロAで発生しました.
- 継続的なキャプチャは,ECGによる刺激の証拠なしに,心血管崩壊 (潜在心室性心拍不全) を引き起こした.
- 連続捕捉の値は,双極ACの22%と単極ACの12%の患者で≤50マイクロAでした.
結論:
- 心臓内漏れ電流は,VFの値を下回ったレベルでは,心血管崩壊を引き起こす可能性があります.
- 静かなAC刺激は,低血圧性心室動脈短縮症として現れます.
- 現在の50マイクロAの安全基準は不十分かもしれない. 連続捕捉の値に基づいて, ≤20マイクロAの改訂された基準を推奨する.
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