Antepartum Non-stress Cardiotocography in 'High Risk' Pregnancies

Abstract

Non-stress antepartum fetal cardiotocographic tracings were obtained on 2268 occasions from 1084 'at risk' pregnancies, and the findings are assessed in 834 of these that were recorded within 7 days of delivery or fetal death. The baseline fetal heart rate, reactivity, baseline variability and the response to spontaneous uterine contractions have been related to the perinatal outcome. Poor or absent reactivity, reduced baseline variability and variable or late decelerations, in response to contractions, were useful indicators of fetal compromise, but baseline heart rate was less helpful. These abnormalities can occur individually, or in combination, and the different patterns so produced have been related to perinatal outcome.

Product of fetal crown‐rump length and trunk area: ultrasound measurement in high‐risk pregnancies

“…Whilst the false-negative rate of 8% found is similar to that in the initial study (6%), the falsepositive rate is much higher, 42% compared with 12%; this probably reflects the skewed birth- , the 10th centile being used as a 'demarcation line'. most importantly, cardiotocographic findings (Flynn et al 1979;McCune et al 1983). Many healthy small-for-dates fetuses and appropriately-grown 'false-positives' may be managed conservatively in this way.…”