Intracavitary potentials in type B ventricular pre-excitation.

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Abstract
Classification of ventricular pre-excitation was discussed and the electrocardlographic evidence of the sites of pre-excitation was reviewed. Intracardiac electrocardiograms of type B ventricular pre-excitation are presented from 4 heart chambers in a boy with Ebstein''s anomaly of the tricuspid valve. These confirm that early activation spreads from right to left ventricle in contrast with previous evidence of spread from left to right in type A preexcitation, supporting the majority view that type A is left ventricular and type B right ventricular preexcitation.