title: Extrasystoles and parasystole: mechanisms involved.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000209:etiology* / Q000503:physiopathology; D005117:Cardiac Complexes, Premature / Q000209:etiology* / Q000503:physiopathology; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans