title: U wave alternans: an electrocardiographic sign of left ventricular failure.
mesh_terms: D000368:Aged; D001794:Blood Pressure; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology; D006333:Heart Failure / Q000503:physiopathology*; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged