title: Concealed AV junctional extrasystoles simulating second-degree sinoatrial block.
abstract: Concealed AV junctional extrasystoles are described which, conducted in a restrograde manner to the sinoatrial junction, interfere with sinus impulses, thus simulating a second-degree, 2:1, sinoatrial block.
mesh_terms: D001283:Atrioventricular Node; D005117:Cardiac Complexes, Premature / Q000175:diagnosis* / Q000209:etiology; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D006973:Hypertension / Q000150:complications; D008875:Middle Aged; D012848:Sinoatrial Block / Q000175:diagnosis*