During a redo procedure for paroxysmal atrial fibrillation (AF) recurrence, mitral isthmus-dependent atrial tachycardia due to a gap in the previous line and rate-dependent slow conduction in sinus rhythm were demonstrated. After initial achievement of mitral isthmus block, adenosine reproducibly triggered conduction recovery and initiated AF. Further ablation led to AF termination and stable b...

A 58-year-old male was admitted for catheter ablation of recurrent atrial tachycardia (AT; Fig. 1A) following 4 previous paroxysmal atrial fibrillation (AF) ablation procedures at other centers involving pulmonary vein (PV) isolation and linear ablations, including cavotricuspid isthmus (CTI), left mitral isthmus, left atrial (LA) roof, and LA anterior line connecting mitral annulus with the ro...

A patient with WPW paroxysmal tachycardia was treated with a permanent artificial pacemaker, with the electrodes attached to the left atrium. The pacemaker is turned off at all times except when the patient activates it by holding a magnet over the implanted power unit. Random atrial pacing at a rate of 108/min has always terminated the tachycardia within 1 min, and usually within 10 sec. Left ...

Coronary sinus (CS) is a landmark for cardiac intervention. Before catheter ablation of paroxysmal supraventricular tachycardia, coronary sinus is used to obtain recordings from the left atrium and ventricle. Despite asymptomatic, anomalies of coronary sinus may become an obstacle for electrophysiological catheterization. Here, we described a case of successful ablation of paroxysmal supraventr...

From the University of Michigan Medical Center, Ann Arbor, Mich. This work was supported by Grants from the Michigan Heart Association and U.S. Public Health Service, National Institutes of Health HE 07406-05. Manuscript received October 3, 1969, accepted February 6, 1970. Address for reprints: Ernest W. Reynolds, Jr., MD, University of Michigan Medical Center, Ann Arbor, Mich. 48104. Combining...

I read with interest the article by David et al. regarding a case of recurrent tachycardia-induced cardiomyopathy secondary to typical atrial flutter. I have some concerns regarding the management of the recurrences of atrial flutter and tachycardiainduced cardiomyopathy in this case. The authors’ choice of treatment involved DC cardioversion of the atrial flutter that was successful in restori...

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...

Catheter ablation is at the forefront of the management of a range of atrial arrhythmias. In this Series paper, we discuss the underlying mechanisms and the current role of catheter ablation for the three most common atrial arrhythmias encountered in clinical practice: focal atrial tachycardia, atrial flutter, and atrial fibrillation. The mechanisms of focal atrial tachycardia and atrial flutte...

Cryoablation was applied to the treatment of 15 refractory tachyarrhythmias in 12 patients, Wolff-Parkinson-White atrioventricular reentrant tachycardia (WPW) in five patients, paroxysmal atrial fibrillation (PAF) in five patients, chronic atrial fibrillation (CAF) in one patient, paroxysmal atrial tachycardia (PAT) in two patients and paroxysmal ventricular tachycardia (PVT) in two patients. A...