title: Concealed (proximal) Wenckebach phenomenon with distal 2:1 exit block in the ectopic-ventricular junction.
abstract: The findings in two patients with interpolated ventricular extrasystoles showing 2:1 exit block are reported. In these patients the blocked impulses appear to penetrate into the ectopic-ventricular junction (or reentrant pathway) to a varying extent, and the coexistance of a distal 2:1 exit block and a proximal (concealed) Wenckebach phenomenon in the ectopic-ventricular junction is suggested.
mesh_terms: D005117:Cardiac Complexes, Premature / Q000150:complications* / Q000175:diagnosis; D004374:Ductus Arteriosus, Patent / Q000150:complications; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000150:complications* / Q000175:diagnosis; D006352:Heart Ventricles; D006801:Humans; D008875:Middle Aged