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Narrow QRS Complex Tachycardia with Atrioventricular Dissociation

1988; Wiley; Volume: 11; Issue: 4 Linguagem: Inglês

10.1111/j.1540-8159.1988.tb05997.x

1540-8159

Akihiko Shimizu, Tohru Ohe, Hiroshi Takaki, Shiro Kamakura, Mokuo Matsuhisa, Iwao Sato, Katsuro Shimomura,

Atrial Fibrillation Management and Outcomes

We describe the case of a 22‐year‐old man who had frequent episodes of narrow QRS complex tachycardia with atrioventricular dissociation. The ECG during sinus rhythm showed normal PR and QRS intervals, hut it showed a left bundle branch block configuration during atrial pacing or after injection of verapamil. An electrophysiological study demonstrated that the patient had nodoventricular Mahaim fibers. The narrow QRS complex tachycardia was explained by a circuit involving antegrade conduction via the atrioventricular nodo‐His axis and retrograde conduction via the nodoventricular bypass tract.