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OVER THE PAST FEW YEARS, a number of clinical studies have been reported in which atrial pacing techniques were used.1Although episodes of atrial fibrillation have previously been noted during atrial pacing studies in man,2 no demonstration of the mode of onset of these arrhythmias has been published. It is the purpose of this communicationi to report the(More)
The mechanism of the AV nodal Wenckebach phenomenon was studied in 25 dogs by multiple atrial and His bundle electrogram (HBE) recordings. During ventricular stimulation with 1:1 retrograde conduction, the interval from the stimulus artifact to the retrograde His deflection (S-H interval) remained constant. Decreasing the cycle length of stimulation (CLS)(More)
In a patient with the Wolff-Parkinson-White Syndrome we observed atrial fibrillation and three distinct paroxysmal re-entrant tachycardias. Intracardiac electrograms obtained during the tachycardias showed the mechanisms to be A-V nodal, accessory pathway and sinus node re-entry. When P wave morphology, R-P relationship and QRS configuration are considered,(More)
was used as a measure of A-V conduction and the interval from the His bundle electrogram to the S wave (H-S interval) was used as a measure of intraventricular conduction. Propranolol significantly prolonged the P-H interval in every patient at all paced heart rates, and it had no effect on the H-S interval. In two patients propranolol prolonged the(More)