解剖指引:心臟與心律異常

正常竇性心律心房纖維顫動

正常竇性心律
為了將血液泵往全身,心臟依照電子脈衝刺激其腔室(心房與心室),在每次心跳時規律地收縮與放鬆。多數健康的心臟有正常的竇性心律。心搏率在60-100下之間表示「正常」。「竇」代表著竇房結,是每次心跳開始產生電子脈衝的地方。

我們使用心電圖(ECG)追蹤心臟電流,如動畫所示。P波代表電流流經心房(心臟上方腔室)。QRS波代表電流流經心室(下方腔室),心室收縮而將血液從心臟推出去。T波表示再極化,心臟電流再度設定以進行下次跳動。在正常的竇性心律中,ECG通常是規律的,表示它們的峰頂之間有均勻地間隔。

 

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

Source Documentation: American Heart Association.

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