title: [Case report of atrial parasystole and on the mechanism of its onset].
mesh_terms: D001145:Arrhythmias, Cardiac / Q000209:etiology / Q000503:physiopathology; D004562:Electrocardiography; D006325:Heart Atria; D006327:Heart Block / Q000150:complications / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012849:Sinoatrial Node / Q000503:physiopathology