Demonstration of Entrance Block into the Atrioventricular Node of Man
作者:
P. Varghese,
Anthony Damato,
Karen Paulay,
John Gallagher,
Sun Lau,
期刊:
Circulation
(OVID Available online 1972)
卷期:
Volume 46,
issue 1
页码: 123-128
ISSN:0009-7322
年代: 1972
出版商: OVID
关键词: Concealed conduction;Full recovery time of A-V node;His bundle recordings;Supernormal phase of A-V conduction;Premature atrial stimulation
数据来源: OVID
摘要:
Entrance block of an atrial premature beat (APB) into the atrioventricular node is demonstrated by its lack of effect on the A-V nodal conduction of a subsequent beat which is introduced before the full recovery time of the A-V node. This phenomenon was demonstrated in five patients by using programmed atrial stimulation and His bundle recordings. Entrance block into the A-V node occurred in a narrow range (28-33%) of the basic cycle length and concealed conduction occurred at coupling intervals longer than this range. It appears that entrance block of these early APBs is due to a “functional block’ between the atrium and the A-V node. The concept of an entrance block into the A-V node is useful in explaining some forms of the supernormal phase of A-V conduction as well as in the interpretation of complex arrhythmias.
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