title: Pseudo AV block produced by concealed extrasystoles arising below the bifurcation of the His bundle.
mesh_terms: D000368:Aged; D005117:Cardiac Complexes, Premature / Q000150:complications* / Q000209:etiology; D004562:Electrocardiography; D006327:Heart Block / Q000209:etiology*; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged