title: Day-to-day variation of the Frank electrocardiogram and vectorcardiogram in heart disease.
mesh_terms: D000328:Adult; D000368:Aged; D003327:Coronary Disease / Q000503:physiopathology; D003936:Diagnosis, Computer-Assisted; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006331:Heart Diseases / Q000503:physiopathology*; D006801:Humans; D006973:Hypertension / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D013997:Time Factors; D014672:Vectorcardiography