解剖指引:心脏与心律异常

正常窦性心律心房纤维颤动

正常窦性心律
为了将血液泵往全身,心脏依照电子脉冲刺激其腔室(心房与心室),在每次心跳时规律地收缩与放松。多数健康的心脏有正常的窦性心律。心搏率在60-100下之间表示「正常」。「窦」代表著窦房结,是每次心跳开始产生电子脉冲的地方。

我们使用心电图(ECG)追踪心脏电流,如动画所示。P波代表电流流经心房(心脏上方腔室)。QRS波代表电流流经心室(下方腔室),心室收缩而将血液从心脏推出去。T波表示再极化,心脏电流再度设定以进行下次跳动。在正常的窦性心律中,ECG通常是规律的,表示它们的峰顶之间有均匀地间隔。

 

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MEDICAL REVIEW: Reviewed by Louise Chang, MD on October 29, 2008

Source Documentation: American Heart Association.

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