Fairlie F M, Lang G D, Sheldon C D
Glasgow Royal Maternity Hospital.
Br J Obstet Gynaecol. 1989 Feb;96(2):151-7. doi: 10.1111/j.1471-0528.1989.tb01654.x.
Doppler signals were recorded from the umbilical arteries in 103 women during labour. The pulsatility index (PI) did not alter with progress in labour. During uterine contractions the PI showed a change only if there was a deceleration in the fetal heart rate. Low birthweight (less than 10th centile) and delivery by caesarean section for fetal distress were significantly more frequent in patients with abnormal PI values (defined as greater than 2 SD above the mean in normal labours). Fetal scalp blood pH was measured in 24 patients. The PI was abnormal in only one case, but none of the 24 had a pH less than 7.20.
在103名产妇分娩期间记录了脐动脉的多普勒信号。搏动指数（PI）并不随分娩进程而改变。在子宫收缩期间，只有当胎儿心率减速时PI才会出现变化。PI值异常（定义为在正常分娩中高于平均值2个标准差以上）的患者中，低体重儿（低于第10百分位数）和因胎儿窘迫行剖宫产的比例明显更高。对24名患者测量了胎儿头皮血pH值。仅1例PI异常，但这24名患者中无一例pH值低于7.20。
