An ECG study of atrial activity and premature QRS complexes of aberrant shape using an external special-lead system.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D002648:Child; D003937:Diagnosis, Differential; D004562:Electrocardiography / Q000295:instrumentation; D005260:Female; D006330:Heart Defects, Congenital / Q000175:diagnosis; D006331:Heart Diseases / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged