Electrophysiologic studies were performed in 14 patients with atrioventricular nodal reentrant paroxysmal tachycardia (PSVT) before and after oral administration of 1.2-1.6 g quinidine sulfate over a 24-hour period (0.3-0.4 g every 6 hours). Studies were performed after 0.5-1 mg i.v. atropine before and after quinidine. All 14 patients had induction of sustained PSVT before quinidine, with or w...

BACKGROUND Hypertension is one of the most important risk factors for atrial fibrillation (AF). Recent studies suggest right atrial remodeling in hypertensive patients may be associated with increased inducibility of AF. This study sought to characterize the electroanatomic features of left and right atria and pulmonary veins (PVs) in hypertensive patients. METHODS AND RESULTS A prospective o...

UNLABELLED We reported a 60-year-old male patient who had a paroxysmal supraventricular tachycardia with QRS duration alternans (alternation between narrow QRS and wide QRS beats) and electrical alternans, but without any cycle length alternans. In the laboratory, slow-fast atrioventricular nodal reentrant tachycardia was easily induced by an atrial extrastimulus, and the arterial pressure reco...

The common atrioventricular nodal re-entry tachycardia is the most common form of paroxysmal supraventricular tachycardia. It starts frequently with a supraventricular ectopic beat that, on finding the fast pathway in refractory period, travels in the slow pathway as to appear as a prolongation of the PR interval on the ECG. In this study, we show a singular case of a common atrioventricular no...

A 25-year-old woman with a 5-year history of paroxysmal supraventricular tachycardia underwent an electrophysiologic procedure. The baseline sinus cycle length, atrial–His-bundle (AH) interval, and His-bundle–ventricular (HV) interval were 750, 60, and 50 msec, respectively. Paroxysmal supraventricular tachycardia with a cycle length of 320 msec was induced by programmed atrial stimulation with...

THE RELATIVELY BENIGN NATURE of paroxysmal supraventricular tachycardia (PSVT) in patients with normal cardiovascular systems stands in sharp contrast to the malignant nature of supraventricular arrhythmias encountered in patients with structural heart anomalies.I-3 Risk is especially high after complex corrective or palliative heart surgery. Patients after Fontan palliation for functionally si...

A 41-year-old male with situs inversus totalis had paroxysmal supraventricular tachycardia. On electrophysiology study, the mechanism of the tachycardia was determined as slow/fast atrioventricular nodal reentrant tachycardia and slow pathway was successfully performed under fluoroscopic guidance.

The effects of isoprenaline on the induction of supraventricular tachycardia by programmed stimulation were studied in 67 patients to see whether they correlated with spontaneous catecholamine mediated symptoms during exercise testing and Holter monitoring. Thirty seven control patients (group 1) did not have spontaneous arrhythmias either during exercise testing or Holter monitoring. Thirty pa...

Electrophysiological effects of 750 mg i.v. procainamide were studied in 14 patients with dual pathway atrioventricular (A-V) nodal re-entrant paroxysmal tachycardia (PSVT). All patients utilized an A-V nodal slow pathway for antegrade and an A-V nodal fast pathway for retrograde conduction during PSVT. In all 14 patients, procainamide depressed retrograde fast pathway conduction, manifest by i...