文氏周期
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atypical wenckebach period 不典型文氏周期
retrograde Wenckebach period 逆行性文氏周期
alternating wenckebach period 交替性文氏周期
non-alternating wenckebach period 非交替性文氏周期
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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