Electrophysiological studies were performed in eight patients (four men and four women, mean (SD) age 24 (5) years with paroxysmal attacks of palpitation during or immediately after exercise. Five patients were competitive athletes at college. In two patients spontaneous supraventricular tachycardia during exercise was recorded by ambulatory electrocardiographic monitoring and in another it was...

We present data from 18 year old male patient referred to our clinic for evaluation and treatment due to persistent premature atrial contractions (PAC). Up to the time of admission, the patient never experienced paroxysmal tachycardia, and his principal complaint was the irregular heart rhythm refractory to all types of antiarrhytmic drug therapy. Electrophysiological study was performed and it...

A 19-year-old Chinese man presented with tachyarrhythmia during a human centrifuge session while performing a Valsalva manoeuvre at near normal (+1.4 Gz) centripetal forces. It was likely that the hydrostatic effects of sustained centrifugal forces, the distortion of the heart's shape, as well as swings in the autonomic dominance pre- and post-Valsalva manoeuvre, contributed to the tachyarrhyth...

BACKGROUND A specific local indicator in the Koch's triangle could be critical to the complication-free treatment of atrioventricular nodal reentrant tachycardia by transcatheter radiofrequency ablation. Recording of perinodal slow potential reflects a slow conduction area, and probably indicates the location of the slow pathway component of the circuit. Specific ablation of the slow pathway wo...

A proportion of patients with atrial fibrillation and other supraventricular arrhythmias remain refractory to medical therapy and require definitive treatment. In some cases, the arrythmia may be cured by catheter or surgical ablation. Techniques have recently been developed for disruption of the substrate for atrioventricular nodal reentry tachycardia'-3 and atrial flutter,4'5 and a potential ...

This report details the case of 17 year old identical twins who both presented with paroxysmal supraventricular tachycardia (PSVT). Electrophysiological studies revealed atrioventricular nodal reentry tachycardia (AVNRT) in both twins. Successful but technically challenging slow pathway ablation was performed in both twins. This is the first reported case of confirmed AVNRT in identical twins w...

A 19-year-old female underwent repair of complex congenital heart disease (atrial and ventricular septal defect with a supero-inferior ventricular relationship) in infancy. Because of recurrent palpitations she underwent an electrophysiology study. Atypical atrioventricular nodal reentrant tachycardia was diagnosed. Catheter ablation was performed successfully using cryothermal energy. The diag...