Age-related prognosis of syncope associated with a preexcitation syndrome.

Background: Syncope in Wolff-Parkinson-White syndrome (WPW) is without relationship with WPW or reveals a poorly tolerated arrhythmia. Electrophysiologic study (EPS) is recommended. The purpose of the study was to evaluate the influence of the patient's age on the causes and prognosis of syncope.

Incidence and prognostic significance of spontaneous and inducible antidromic tachycardia.

Aims: Orthodromic atrioventricular reentrant tachycardia (ORT) is the most common arrhythmia at electrophysiological study (EPS) in patients with pre-excitation. The purpose of the study was to determine the clinical significance and the electrophysiological characteristics of patients with inducible antidromic tachycardia (ADT).

Methods And Results: Electrophysiological study was performed in 807 patients with a pre-excitation syndrome in control state and after isoproterenol.