title: Concealed retrograde conduction of an atrial echo in second degree A-V block of the Wenckebach type with modified ventricular acceleration.
abstract: Whereas second degree A-V block showing the classical pattern of the Wenckebach phenomenon is easily diagnosed, variant forms of the Wenckebach phenomenon in second degree A-V block may pose difficulties to the interpretor. A case is presented, where modified acceleration of the ventricles--a crucial "pointer" to the Wenckebach A-V block -- is disturbed by concealed conduction of an atrial echo. Differences in the electrocardiographic manifestation between this and the classical type of second degree A-V block of the Wenckebach type are discussed.
mesh_terms: D001281:Atrial Fibrillation / Q000209:etiology; D004562:Electrocardiography; D006327:Heart Block / Q000209:etiology / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology*; D006349:Heart Valve Diseases / Q000150:complications; D006801:Humans; D008297:Male; D008875:Middle Aged; D013610:Tachycardia / Q000209:etiology; D013997:Time Factors