Observations on Mechanisms of Circus Movement Tachycardia in the Wolff-Parkinson-White Syndrome. Role of Different Tachycardia Circuits and Sites of Block in Maintenance of Tachycardia |
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Authors: | PEDRO BRUGADA FRITS W.H.M. BAR EDDY J. VANAGT HEIN J.J. WELLENS |
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Affiliation: | Department of Cardiology, University of Limburg, Annadal Hospital, Maastricht, The Netherlands |
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Abstract: | Different mechanisms of block of impulse propagation in several re-entrant circuits resulted in a major discordance between the "echo-zone" and the "tachycardia-zone" in a patient with intermittent Wolff-Parkinson-White syndrome, dual atrioventricular nodal pathways, and bundle branch re-entry. This case illustrates the delicate balance in electrophysiological properties required between the tissues incorporated in a re-entrant circuit to initiate and sustain the arrhythmia. It also shows how the presence of several reentrant pathways can lead to refractoriness in the circuit responsible for the circus movement tachycardia. |
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Keywords: | re-entry circuits circus movement tachycardia Wolff-Parkinson-White syndrome arrhythmia accessory pathways |
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