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  • Title: 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.
    Author: Brugada P, Bar FW, Vanagt EJ, Wellens HJ.
    Journal: Pacing Clin Electrophysiol; 1981 Sep; 4(5):507-16. PubMed ID: 6169035.
    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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