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Spontaneous Transition of 2:1 Atrioventricular Block to 1:1 Atrioventricular Conduction During Atrioventricular Nodal Reentrant Tachycardia:: Evidence Supporting the Intra‐Hisian or Infra‐Hisian Area as the Site of Block by SHIH‐HUANG LEE; CHING‐TAI TAI; CHERN‐EN CHIANG; WEN‐CHUNG YU; JUN‐JACK CHENG; YU‐AN DING; MAU‐SONG CHANG; SHIH‐ANN CHEN is a Medicine article available to read on EtoBox.

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__Introduction:__ The incidence of spontaneous transition of 2:1 AV block to 1:1 AV conduction during AV nodal reentrant tachycardia has not been well reported. Among previous studies, controversy also existed about the site of the 2:1 AV block during AV nodal reentrant tachycardia. __Methods and Results:__ In patients with 2:1 AV block during AV nodal reentrant tachycardia, the incidence of spontaneous transition of 2:1 AV block to 1:1 AV conduction and change of electrophysiologic properties during spontaneous transition were analyzed. Among the 20 patients with 2:1 AV block during AV nodal reentrant tachycardia, a His‐bundle potential was absent in blocked beats during 2:1 AV block in 8 patients, and the maximal amplitude of the His‐bundle potential in the blocked beats was the same as that in the conducted beats in 4 patients and was significantly smaller than that in the conducted beats in 8 patients (0.49 ± 0.25 mV vs 0.16 ± 0.07 mV, P = 0.007). Spontaneous transition of 2:1 AV block to 1:1 AV conduction occurred in 15 (75%) of 20 patients with 2:1 AV block during AV nodal reentrant tachycardia. Spontaneous transition of 2:1 AV block to 1:1 AV conduction was associated with t

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Author

SHIH‐HUANG LEE; CHING‐TAI TAI; CHERN‐EN CHIANG; WEN‐CHUNG YU; JUN‐JACK CHENG; YU‐AN DING; MAU‐SONG CHANG; SHIH‐ANN CHEN

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Futura Publishing Company, Inc; Blackwell Publishing Inc.; Wiley (ISSN 1540-8167)

Published

2003

Language

EN

Field

Medicine (Health Sciences)