The change of symptom, physical sign and 24h Holter monitoring electrocardiogram were observed.

观察症状、体征、24小时动态心电图等变化。

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And the changes of S-T segment were monitored by Holter monitoring electrocardiogram. The incidence of myocardial ischemia was analyzed.

同时，通过动态心电图监测仪监测S -T段变化，分析心肌缺血发生例数；

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There was first-degree AV block in 5 patients (2.7%) documented by electrocardiogram and in 9 patients(7.6%) revealed during Holter monitoring.

一度房室阻滞经心电图证实为5例（2.7%），经动态心电图监测为9例（7.6%）。

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