VENTRICULAR TACHYCARDIA INDUCED BY PREMATURE SUPRAVENTRICULAR BEATS WITH A NORMAL QRS COMPLEX - ANALYSIS OF A CASE

  • 1 January 1975
    • journal article
    • research article
    • Vol. 68  (9) , 969-976
Abstract
Attacks of ventricular tachycardia in a 39-yr-old man, free from heart disease are reported. Cardiac pacing showed that the tachycardia could be induced by premature supraventricular beats normally propagated to the ventricles, and by atrial acceleration. The same part played by the cardiac rate on triggering of attacks was demonstrated during ventricular pacing. The possibility of interrupting the tachycardia by 1 electrically induced ventricular beat, supports the hypothesis of a re-entry mechanism. The QRS configuration during the arrhythmia suggested a propagation of excitation starting from the posterior-inferior area of the left ventricle. The absence of anomalies of the supraventricular beats initiating the tachycardia excluded a circus movement resulting from a unidirectional block on the left anterior hemibranch. There probably existed an area of micro-reentry, stimulating the left ventricle from the posterior branches of the His-Purkinje system.

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