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Gary Mires, senior lecturer a, Fiona Williams, lecturer b, Peter Howie, professor a.
a Department of Obstetrics and Gynaecology, Ninewells Hospital and Medical School, Dundee, Tayside DD1 9SY, b Department of Epidemiology and Public Health, Ninewells Hospital and Medical School
Subject: Randomised controlled trial of cardiotocography versus Doppler auscultation of fetal heart at admission in labour in low risk obstetric population
"There were no significant differences in the incidence of metabolic acidosis or any other measure of neonatal outcome among women who remained at low risk when they were admitted in labour. However, compared with women who received Doppler auscultation, women who had admission cardiotocography were significantly more likely to have continuous fetal heart rate monitoring in labour (odds ratio 1.49, 95% confidence interval 1.26 to 1.76), augmentation of labour (1.26, 1.02 to 1.56), epidural analgesia (1.33, 1.10 to 1.61), and operative delivery (1.36, 1.12 to 1.65).
Conclusions: Compared with Doppler auscultation of the fetal heart, admission cardiotocography does not benefit neonatal outcome in low risk women. Its use results in increased obstetric intervention, including operative delivery. "
"The main justification for admission cardiotocography is that the uterine contractions of labour put stress on the placental circulation; an abnormal tracing might indicate a deficiency and hence identify potential fetal compromise at an early enough stage to allow intervention. Furthermore, a normal admission cardiotocogram offers reassurance. However, the incidence of intrapartum fetal compromise is low in pregnancies that have been uncomplicated before the onset of labour. Thus, labour admission cardiotocography may represent unnecessary intervention. In such low risk cases, confirmation of a normal fetal heart rate by Doppler auscultation should be sufficient.2
Evidence from randomised trials shows that routine electronic fetal monitoring throughout labour results in increased, and probably unnecessary, intervention for apparent fetal distress.3-5 Admission cardiotocography in a low risk obstetric population may therefore result in increased obstetric intervention without fetal and neonatal benefit. We compared the effects of labour admission cardiotocography and Doppler auscultation of the fetal heart on neonatal outcome and levels of obstetric intervention in a low risk obstetric population. "