title: T wave alternans: an association with abrupt rate change.
mesh_terms: D000368:Aged; D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D006332:Cardiomegaly / Q000503:physiopathology*; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D008297:Male; D013997:Time Factors; D014693:Ventricular Fibrillation / Q000503:physiopathology