目的探讨急性心肌梗死测定最大QT间期的导联选择及分析心肌梗死急性期QT离散度与恶性以律失常的相关性。

Objective To study the lead selection of QT interval measurment in the patients with acute myocardial infarction and to examine the relation of QT dispersion with VT/VF.

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当生命数据是离散的、未删失数据含有打结的和有协变量信息时，离散生存分析模型是适当的选择。

Discrete-time survival model is appropriate as survival data are discrete, tied and some effects for covariates are added.

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