Odendaal H J, Van der Merwe J V
S Afr Med J. 1976 Nov 17;50(49):1960-2.
Cardiotocograms of 6044 patients in labour were examined for evidence of an abrupt fall in the fetal heart 50 beats within 3 minutes, without a demonstration of signs of recovery in the following 2 minutes. Only 9 instances could be found -- an incidence of 0,15%. Umbilical cord entanglement possibly played a role in 6 of these instances, and 2 of the infants concerned were stillborn. Intra-uterine growth retardation was associated with deceleration in 3 infants, 1 of whom was stillborn.
对6044名分娩患者的胎心监护图进行了检查，以寻找胎儿心率在3分钟内突然下降50次/分钟且在随后2分钟内未显示恢复迹象的证据。仅发现9例——发生率为0.15%。其中6例可能与脐带缠绕有关，相关的2名婴儿为死产。3例胎儿生长受限与减速有关，其中1例为死产。
