TITLE

Right Bundle Branch Block With Periods of Alternating Left Anterior and Left Posterior Hemiblock

AUTHOR(S)
Lichstein, Edgar; Ribas-Meneclier, Carlos; Gupta, Prem K.; Chadda, Kul D.
PUB. DATE
November 1978
SOURCE
Angiology;Nov1978, Vol. 29 Issue 11, p862
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The case presented had an electrocardiographic pattern of complete right bundle branch block with alternating periods of left anterior hemiblock and left posterior hemiblock. During one of the periods of alternating hemiblock, an His bundle electrogram was recorded and the His Purkinje (H-V interval) conduction time was within normal limits. In a second episode of alternating hemiblock, periods of Mobitz type II second-degree A-V block were noted. It is postulated that this case provides clinical evidence that incomplete block of a fascicle may occur in spite of an electrocardiographic pattern of complete fascicular block. It is thought that the periods of alternating hemiblock result from a changing relationship between conduction velocity and refractory period.
ACCESSION #
16395374

 

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