title: Mechanism of reciprocating tachycardia initiated during sinus rhythm in concealed Wolff-Parkinson-White syndrome: report of a case.
abstract: Reciprocating tachycardia in a patient with a leftsided atrioventricular accessory pathway (AP) (Kent bundle, type A) capable only of ventriculo-atrial (V-A) transmission is described. The V-A AP is established as an essential link of the tachycardia circuit, as evidenced by : 1) retrograde atrial activation of the left atrium (LA) 60 msec or more before the low and high right atrium during reciprocating tachycardia and during V-A conduction; 2) the absence of refractory-dependent delay in V-A conduction time with progressively premature ventricular stimulation, characteristic of retrograde conduction through an AP; and 3) the absence of antegrade conduction through the Kent bundle during sinus rhythm, reciprocating tachycardia, pacing from either atrium, or during induced atrial flutter-fibrillation. The onset of the tachycardia was unique in that it could be initiated and perpetuated during sinus rhythm, without a triggering mechanism of an atrial or ventricular extrasystole. The interplay of the following two events seemed to favor the initiation of the tachycardia: 1) shortening of the atrial cycle length causing a decrease in the refractory period of the LA and/or the AP; and 2) the development of rate-dependent left bundle branch block, delaying impulse arrival at the ventricular end of the AP. These observations described an additional mechansim of reciprocating tachycardia in patients with the Wolff-Parkinson-White syndrome.
mesh_terms: D000200:Action Potentials; D000328:Adult; D001283:Atrioventricular Node / Q000503:physiopathology; D002037:Bundle-Branch Block / Q000503:physiopathology; D004558:Electric Stimulation; D004562:Electrocardiography; D006801:Humans; D008297:Male; D009200:Myocardial Contraction; D009431:Neural Conduction; D012032:Refractory Period, Electrophysiological; D012849:Sinoatrial Node / Q000503:physiopathology*; D013614:Tachycardia, Paroxysmal / Q000503:physiopathology*; D014927:Wolff-Parkinson-White Syndrome / Q000503:physiopathology*