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Obstetrics & Gynecology 1973;41:355-363
© 1973 by The American College of Obstetricians and Gynecologists
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Quantification of Fetal Heart Beat-to-Beat Interval Differences

SZE-YA YEH, MD, ALAN FORSYTHE, PhD and EDWARD H. HON, MD, FACOG

From the Department of Obstertics and Gynecology, Los Angeles County-University of Southern California Medical Center. Los Angeles, Ca 90033

Abstract

A numerical method for quantitating fetal heart beat-to-beat interval differences is introduced. This method appears to be valuable for assessing the status of the nervous mechanisms controlling the fetal heart. It consists of two indices—viz, "interval index (II)" measures the relatively long-term fluctuations in fetal R–R intervals; and "differential index (Dl)" measures the relatively short-term fluctuations in fetal R—R intervals. Both indices can be displayed serially in a numerical or analog form.






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Copyright © 1973 by the American College of Obstetricians and Gynecologists.