Electrophysiological properties of dual atrioventricular nodes in patients with right atrial isomerism

There are reports that in right atrial isomerism the conduction system has paired sinus nodes and paired atrioventricular nodes. Electrophysiological studies were performed in two patients with right atrial isomerism. One patient had a delta wave on the surface electrocardiogram without tachycardia...

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Bibliographic Details
Published in:British Heart Journal 1995-11, Vol.74 (5), p.553-555
Main Authors: Wu, M. H., Lin, J. L., Wang, J. K., Chiu, I. S., Young, M. L.
Format: Article
Language:English
Subjects:
Atrioventricular Node - abnormalities
Atrioventricular Node - physiopathology
Biological and medical sciences
Cardiology. Vascular system
Child
Child, Preschool
Congenital heart diseases. Malformations of the aorta, pulmonary vessels and vena cava
Electrocardiography
Heart
Heart Atria - abnormalities
Humans
Male
Medical sciences
Tachycardia - physiopathology
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Summary:There are reports that in right atrial isomerism the conduction system has paired sinus nodes and paired atrioventricular nodes. Electrophysiological studies were performed in two patients with right atrial isomerism. One patient had a delta wave on the surface electrocardiogram without tachycardia attacks. The other, who did not have manifest pre-excitation, had recurrent narrow QRS tachycardia. Electrophysiological studies suggested the presence of dual atrioventricular nodes. Only unidirectional atrioventricular or ventriculoatrial conduction was demonstrated for these dual atrioventricular nodes even after infusion of isoprenaline. It is suggested that unidirectional conduction may be a common property of the dual atrioventricular nodes in right atrial isomerism and that the absence of retrograde ventriculoatrial conduction protects the patients against tachycardia.
ISSN:0007-0769
1355-6037
1468-201X
2053-5864
DOI:10.1136/hrt.74.5.553