高钙血症和其他导致-间期缩短的原因

高钙血症可以缩短窦性心律患者的Q-T间期，其心电图特征为短的Q波至T波顶点间期、偶见ST段消失和T波倒置。洋地黄亦可缩短以R为主之导联的Q-T间期。另外，Q-T间期缩短还可见高温、高钾血症和自主神经张力改变等。一种以校正Q-T间期缩短（短于300ms）、伴有严重室性心律失常，甚至可诱发猝死为特征的先天性短Q-T间期综合征亦见报道。

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