The anterograde effective refractory period and Wenckebach block point were measured before and after ablation.

进行慢径路改良，观察手术前后房室结的前传有效不应期和文氏阻滞点的改变。

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The anterograde effective refractory period and Wenckebach block point were measured before and after ablation.

进行慢径路改良，观察手术前后房室结的前传有效不应期和文氏阻滞点的改变。

youdao