title: Considerations on impulse formation in the left atrium and its diagnosis by electrocardiogram.
mesh_terms: D000818:Animals; D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D004285:Dogs; D004562:Electrocardiography; D006168:Guinea Pigs; D006325:Heart Atria / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D010138:Pacemaker, Artificial