Spontaneous variations in atrioventricular conduction in pre-excitation

Atrial pacing in a patient with a Wolff-Parkinson-White syndrome pattern showed unusual variability in AV nodal conduction time. Changes in the AV nodal conduction time occurred predominantly at paced rates in excess of 100/min and consisted of abrupt or gradual decreases in the AH interval. Such de...

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Bibliographic Details
Published in:British Heart Journal 1976-04, Vol.38 (4), p.427-430
Main Authors: Parameswaran, R, Ohe, T, Nakhjavan, F K, Goldberg, H
Format: Article
Language:English
Subjects:
Adult
Atrioventricular Node - physiopathology
Electrocardiography
Heart Conduction System - physiopathology
Humans
Male
Wolff-Parkinson-White Syndrome - physiopathology
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Description
Summary:Atrial pacing in a patient with a Wolff-Parkinson-White syndrome pattern showed unusual variability in AV nodal conduction time. Changes in the AV nodal conduction time occurred predominantly at paced rates in excess of 100/min and consisted of abrupt or gradual decreases in the AH interval. Such decreases resulted in unexpected normalization of the QRS pattern. In addition, pacing also revealed evidence of block in the accessory pathway. Such changes in atrioventricular conduction may account for the known variability of the QRS pattern in patients with the WPW syndrome. Further, they may also explain the benign clinical course in this patient.
ISSN:0007-0769
1355-6037
1468-201X
2053-5864
DOI:10.1136/hrt.38.4.427