Termination of Reciprocating Tachycardia by Atrial Stimulation

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Abstract
Recurrent tachycardia in a 10-year-old child with acute rheumatic carditis was interpreted as being produced by a reciprocating (circus) mechanism involving either the normal atrioventricular pathway or the anomalous pathway of the Wolff-Parkinson-White syndrome. The tachycardia could be stopped by appropriately timed, electrically induced, atrial premature systoles, which apparently interrupted the circus movement.