Syncope Due to Idiopathic Paroxysmal Atrioventricular Block

Results The study group consisted of 9 men and 9 women, mean age 55 19 years, who had recurrent unexplained syncope for 8 7 years and were subsequently followed up for as long as 14 years (4 4 years on average). The patients had no structural heart disease, standard ECG was normal, and electrophysiological study was negative. In all patients, prolonged ECG monitoring documented paroxysmal complete AV block with 1 or multiple consecutive pauses (mean longest pause: 9 7 s at the time of syncope); AV block occurred without P-P cycle lengthening or PR interval prolongation. During the observation time, no patient had permanent AV block; on permanent cardiac pacing, no patient had further syncopal recurrences.