Recent Electrophysiologic Studies on the Wolff-Parkinson-White Syndrome

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Abstract
THE pre-excitation syndrome has fascinated cardiologists since its initial description in 1930 by Wolff, Parkinson and White.1 In the Wolff-Parkinson-White electrocardiographic anomaly, the ventricles are activated earlier than would be anticipated if the impulse reached the ventricles over the normal atrioventricular conduction system. In the typical electrocardiogram, the PR interval is shorter than normal and usually does not exceed 0.12 second. There is also an initial delta wave, resulting in a QRS width of at least 0.12 second in duration. A delta wave is the slowly rising, slurred initial deflection of the QRS observed in the syndrome. Numerous variations of . . .