Computerized orthogonal electrocardiogram: relation of QRS forces to left ventricular ejection fraction.
D002302:Cardiac Output; D003201:Computers; D004562:Electrocardiography / Q000379:methods*; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*