Second degree block during reciprocal atrioventricular nodal tachycardia

Of 67 patients with reciprocal atrioventricular (A-V) nodal tachycardia consecutively studied by programmed electrical stimulation of the heart, nine patients showed second degree block toward the ventricle and one patient toward the atrium during tachycardia. In four patients the occurrence of bloc...

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Bibliographic Details
Published inCirculation (New York, N.Y.) Vol. 53; no. 4; pp. 595 - 599
Main Authors Wellens, H J, Wesdorp, J C, Düren, D R, Lie, K I
Format Journal Article
LanguageEnglish
Published United States 01.04.1976
Subjects
Adult
Aged
Atrioventricular Node - physiopathology
Bundle-Branch Block - physiopathology
Electric Stimulation
Female
Heart Block - etiology
Heart Block - physiopathology
Heart Conduction System - physiopathology
Humans
Male
Middle Aged
Sinoatrial Node - physiopathology
Tachycardia - complications
Tachycardia - physiopathology
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Summary:Of 67 patients with reciprocal atrioventricular (A-V) nodal tachycardia consecutively studied by programmed electrical stimulation of the heart, nine patients showed second degree block toward the ventricle and one patient toward the atrium during tachycardia. In four patients the occurrence of block was critically related to the prematurity of the test stimulus initiating the tachycardia. In three patients block developed following increase in rate of tachycardia. In two patients block could be elicited by introducing premature ventricular stimuli during tachycardia. Our observations indicate that different mechanisms may be responsible for second degree block during reciprocal supraventricular tachycardia. The finding of second degree block during reciprocal supraventricular tachycardia excludes a tachycardia with A-V conduction over the A-V node - His pathway and V-A conduction over an accessory A-V pathway.
ISSN:0009-7322
1524-4539
DOI:10.1161/01.cir.53.4.595