A diagnostic comparison of the directional and the absolute angle of planar vectors.
D000328:Adult; D000368:Aged; D001021:Aortic Valve; D006349:Heart Valve Diseases / Q000175:diagnosis; D006801:Humans; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*; D014672:Vectorcardiography