Author + information
- Received October 11, 1983
- Revision received December 19, 1983
- Accepted December 21, 1983
- Published online June 1, 1984.
- ↵aAddress for reprints: John P. DiMarco, MD, Box 158, Department of Medicine, University of Virginia School of Medicine, Charlottesville, Virginia 22901.
Paroxysmal supraventricular tachycardia with wenckebach block is an uncommon electrocardiographic finding. Electrophysiologic studies performed in a patient who exhibited this phenomenon indicated that the tachycardia was not caused by either sinus node or intraatrial reentry or abnormal automaticity. The tachycardia cycle length decreased after atropine administration and increased in response to propranolol. Administration of either adenosine (75 to 112.5 µ/kg) or verapamil (10mg) terminated individual episodes of tachycardia. After verapamil and when atrial extrastimuli were introduced, dissociation of atrial activity from His-ventricular activity could be observed even though atrioventricular (AV) nodal block with a clear Wenckebach periodicity could also occur. These findings suggest that paroxysmal Supraventricular tachycardia may be produced by reentry located solely within the upper portion of the AV node.
↵b Dr. Belardinelli is the recipient of Research and Career Development Award 1-K04 HL00 969-01 from the National Institutes of Health, Bethesda, Maryland.
↵c Dr. Sellers is the recipient of American Heart Association, Virginia Affiliate, Fellowship Award 5-31757.
This study was supported by Grantin-Aid 81-911 from the American Heart Association, Virginia Affiliate, Richmond, Virginia.
- Received October 11, 1983.
- Revision received December 19, 1983.
- Accepted December 21, 1983.
- American College of Cardiology Foundation