Mathematic validation of a shorthand rule for calculating QTc.
The shorthand rule that the QTc will be normal if the QT interval is <1/2 the RR interval was mathematically validated. The rule was found to be applicable and useful, provided the heart rate is more than approximately 70 beats/min.
Division of Pediatric Cardiology, New York University Medical Center, New York 10016, USA.
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D000293:Adolescent; D000328:Adult; D000375:Aging / Q000502:physiology*; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D006339:Heart Rate; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008962:Models, Theoretical; D015203:Reproducibility of Results