Electrocardiograms of the month.
D002037:Bundle-Branch Block / Q000175:diagnosis*; D006328:Cardiac Catheterization; D004562:Electrocardiography; D006325:Heart Atria; D006333:Heart Failure / Q000175:diagnosis; D006801:Humans; D008722:Methods; D012214:Rheumatic Heart Disease / Q000175:diagnosis