[Atrial desynchronization induced by Valsalva's maneuver in a patient with reciprocating supraventricular tachycardia and Wolff-Parkinson-White syndrome].
A 22 years old man with ventricular preexcitation syndrome due to a left accessory pathway, was admitted because of orthodromic reciprocating tachycardia, 205 bpm in frequency. The patient was invited to perform a Valsalva Maneuvre, and at its ending, the tachycardia degenerated into atrial fibrillation (AF) associated with high ventricular rate, reverted to sinus rhythm by D.C. shock. The electrophysiologic study documented a left lateral by pass tract, with an anterograde refractory period of 230 msec. AF was inducible and had a minimal RR interval of 220 msec. Vagal stimulation, induced at the end of Valsalva maneuvre, probably caused dispersion of atrial refractorines and intraatrial reentry, converting the orthodromic tachycardia into atrial fibrillation.
Cattedra e Divisione di Cardiologia dell'Università di Padova.
B
B
Martini
G F
GF
Buja
B
B
Canciani
F
F
Maddalena
A
A
Nava
D000328:Adult; D001281:Atrial Fibrillation / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy; D004554:Electric Countershock; D004562:Electrocardiography; D006801:Humans; D008297:Male; D014636:Valsalva Maneuver / Q000009:adverse effects*; D014927:Wolff-Parkinson-White Syndrome / Q000150:complications* / Q000503:physiopathology
Desincronizzazione atriale indotta da manovra di Valsalva in un paziente con tachicardia sopraventricolare reciprocante e sindrome di WPW.