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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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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