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(Circulation. 1971;44:820.)
© 1971 American Heart Association, Inc.

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Supraventricular Tachycardia Initiated by Sinus Beats

BRUCE N. GOLDREYER M.D.¹; MELVIN B. WEISS M.D.¹; ANTHONY N. DAMATO M.D.¹

¹ From the Cardiopulmonary Laboratory, U. S. Public Health Service Hospital, Staten Island, New York.

In the present report, A-V dissociation with concealed retrograde conduction into the A-V node, caused SINUS beats to exhibit antegrade A-V nodal conduction delay sufficient to result in episodes of supraventricular tachycardia (SVT). In this patient, atrial ectopic premature depolarizations were never observed. The primary role of A-V nodal conduction delay in the genesis of paroxysmal SVT is substantiated by this unusual electrophysiological observation.

Key Words: Paroxysmal atrial tachycardia • Atrial reentry • Atrioventricular conduction • A-V dissociation • Ventricular reciprocal rhythm • A-V refractoriness • Atrial echoes • Ventricular echoes • Reentry phenomenon

Submitted on April 9, 1971
Accepted on July 23, 1971