[Ebstein's anomaly with the Wolff-Parkinson-White syndrome]

Thirty-three patients were studied with Ebstein's anomaly, associated to Wolff-Parkinson-White syndrome with the purpose of analyze their electrophysiologic characteristics. In this patients the right preexcitation was before the activation of the right ventricle mass, overshadowing the manifestations of the right bundle branch block (usual in patients with Ebstein's anomaly without preexcitation). In conclusion the absence of manifestations of right bundle branch block in the presence of Ebstein's anomaly diagnosed by hemodynamic study or echocardiography let us think in the coexistence of the preexcitation and suggest the pertinent electrophysiologic study; as the association of supraventricular tachycardia in this group is very high (94%) most of them paroxysmal orthodromic tachycardia.