title: Modulated ventricular parasystole manifesting as apparent Wenckebach exit block.
mesh_terms: D000368:Aged; D005117:Cardiac Complexes, Premature / Q000175:diagnosis* / Q000503:physiopathology; D003937:Diagnosis, Differential; D004562:Electrocardiography; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D008297:Male; D012848:Sinoatrial Block / Q000175:diagnosis* / Q000503:physiopathology