Computerised evaluation of fetal heart rate in post-term fetuses: long term variation

British Journal of Obstetrics and Gynaecology
G MandruzzatoG S Dawes

Abstract

Computerised fetal heart rate records were obtained between 1987 and 1993 using the Sonicaid System 8000 for a cross-sectional study of postdates fetal heart rate variation; 567 singleton pregnancies at 41 and 43 weeks provided 1502 records. In all cases gestational age had been verified by ultrasound examination in early pregnancy. The mean minute range of the long term pulse interval variation, which is known to be correlated with fetal oxygenation was found to decrease progressively from an average value of 48.5 ms at 41 weeks to 46.4 ms and 42.4 ms at 42 and 43 or more weeks, respectively. When conservative management of postdate pregnancies is chosen, accurate measurements are needed to follow the evolution of fetal condition. Reference values for calculated pulse interval variation at later gestational ages are now provided.

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Citations

Aug 15, 2001·International Journal of Gynaecology and Obstetrics : the Official Organ of the International Federation of Gynaecology and Obstetrics·M I ParkS K Koh
Apr 5, 2011·Journal de gynécologie, obstétrique et biologie de la reproduction·E PonceletG Chêne
Jun 3, 2009·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·V SerraC W G Redman
Aug 14, 2009·Journal of Perinatal Medicine·Philip J Steer
Feb 17, 2010·Journal of Perinatal Medicine·Giampaolo MandruzzatoUNKNOWN World Association of Perinatal Medicine

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