Ventriculoatrial Block During Atrioventricular Nodal Reentrant Tachycardia Utilizing Multiple Retrograde Pathways |
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Authors: | TAKESHI INO M.D. TAKESHI TADERA M.D. SHINJIROH MIYAMOTO M.D. KOTOKO TANAKA M.D. TADAAKI OHNO M.D. KOICHI NAGASAWA M.D. HIROKAZU HAYAKAWA M.D. |
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Affiliation: | Department of Internal Medicine, Tama-Nagayama Hospital, Nippon Medical School, Tokyo, Japan;First Department of Internal Medicine, Nippon Medical School, Tokyo, Japan |
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Abstract: | VA Block During Multiple AVNRT. A rare case of narrow QRS tachycardia continuing despite the occurrence of VA block is reported. Right ventricular stimulation suggested dual AV nodal physiology. The tachycardia was induced by ventricular premature stimulation, which failed to depolarize the atrium. Two types of tachycardia that had different retrograde conduction sequences, HA intervals, and cycle lengths were induced. The occurrence of VA block did not terminate the tachycardia but transiently prolonged the tachycardia cycle length. These findings suggest the mechanism is AV nodal reentry utilizing multiple retrograde pathways with intranodal reentry bridging the VA block and maintaining the tachycardia. |
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Keywords: | atrioventricular nodal reentrant tachycardia multiple retrograde pathways intermediate pathway ventriculoatrial block intranodal reentry |
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