[Localization of the point of origin of the pre-excitation wave of type A Wolff-Parkinson White syndrome by echocardiography].

The echocardiographic findings in two patients with type A Wolff-Parkinson-White syndrome with pre-excitation localized at the anterior left ventricular wall are reported. The M-mode echocardiogram demonstrated premature anterior systolic motion of the postero-basal left ventricular endocardium that preceded the normal systolic contraction of the left ventricle. Despite the fact that the bundle of Kent reaches the epicardium of the left ventricular wall and that ventricular contraction probably begins at the subepicardial surface, the echocardiographic observations of the premature contractions were limited to the subendocardial layers.