Clinically significant differences between the "old" analog and the "new" digital electrocardiograms.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography / Q000295:instrumentation*; D004582:Electronics, Medical; D004867:Equipment Design; D006321:Heart / Q000502:physiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D011446:Prospective Studies