描述
室顫電流。指引起心室發(fā)生心室纖維性顫動(dòng)的最小電流。當(dāng)電流持續(xù)時(shí)間超過心臟周期時(shí),室顫電流僅為50mA左右;當(dāng)持續(xù)時(shí)間短于心臟周期時(shí),室顫電流為數(shù)百mA。當(dāng)電流持續(xù)時(shí)間小于0.1s時(shí),只有電擊發(fā)生在心室易損期,500mA以上乃至數(shù)A的電流才能夠引起心室顫動(dòng)。前述電流均指流過人體的電流,而當(dāng)電流直接流過心臟時(shí),數(shù)十微安的電流即可導(dǎo)致心室顫動(dòng)發(fā)生。
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