WOLFF-PARKINSON-WHITE SYNDROME. RIGHT VENTRICULAR PRECONTRACTING AREA PROVED BY CARDIAC CATHETERIZATION.

Abstract A case of Wolff-Parkinson-White syndrome studied by left and right heart catheterization and phonocardiography is presented. The electrocardiograms in a five year follow-up showed remarkable changes which are discussed. The phonocardiogram disclosed a double wave before the first heart sound but no splitting of the heart sounds. The right ventricular pressure tracing confirmed the existence of a precontraction area in the right ventricle. Left and right heart catheterization proved that there was no delay in the effective contraction of both ventricles.