title: Atrial augmentation of surface electrocardiographic leads in study of complex arrhythmias.
mesh_terms: D000368:Aged; D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D001282:Atrial Flutter / Q000175:diagnosis / Q000503:physiopathology; D004562:Electrocardiography; D004566:Electrodes; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000175:diagnosis / Q000503:physiopathology; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D009339:Needles; D013610:Tachycardia / Q000175:diagnosis / Q000503:physiopathology