Sahhaf F, Abbas' Alizadeh F, Kokcheli H, Ghojazadeh M
Department of Obstetrics and Gynecology, Tabriz University (Medical Sciences), Tabriz, Iran.
Pak J Biol Sci. 2010 Jan 1;13(1):34-9. doi: 10.3923/pjbs.2010.34.39.
Both uterine contractions and artificial rupture of fetal membranes (amniotomy) are important events during delivery phase, this study was planned to determine possible effects of both events on fetal heart rate using nonstress test method. Sixty term pregnant women admitted for termination of pregnancy were selected. Primary nonstress test was performed, then nonstress test was done after active uterine contractions. After the amniotomy the last test was done. All results were statistically analyzed. Out of 60 term pregnant women, 51 (85%) patients reported acceleration for primary nonstress test. After uterine contractions, acceleration was seen in 46 (76.7%) patients, this happened in 40 (66.7%) cases after amniotomy. There was no deceleration after primary nonstress test. However, deceleration reported after uterine contractions and amniotomy in five (8.3%) and two (3.3%) cases, respectively. The 56 (93.3%) patients showed variability in primary nonstress test; variability following the uterine contractions and amniotomy was seen in 58 (96.7%) and 56 (93.3%) of subjects, respectively. None of them were statistically significant (p > 0.05). Mean fetal heart rate baseline in primary Nonstress test was (141.00 +/- 9.35), this was (140.50 +/-10.51) following uterine contractions and (143.08 +/- 11.97) after amniotomy. Baseline fetal heart rate reduction, statistically significant, was seen following uterine contractions (r = +0.28, p = 0.02). This means reductions in lower baseline fetal heart rates will be more outstanding. Uterine contractions and amniotomy had no correlation with presence or absence of variability, acceleration and deceleration.
子宫收缩和人工破膜（羊膜穿刺术）都是分娩阶段的重要事件，本研究旨在使用无应激试验方法确定这两个事件对胎儿心率的可能影响。选取了60名足月孕妇入院进行引产。首先进行一次无应激试验，然后在子宫出现活跃收缩后再次进行无应激试验。羊膜穿刺术后进行最后一次试验。所有结果均进行统计学分析。在60名足月孕妇中，51名（85%）患者在初次无应激试验时出现加速。子宫收缩后，46名（76.7%）患者出现加速，羊膜穿刺术后有40名（66.7%）患者出现加速。初次无应激试验后未出现减速。然而，子宫收缩和羊膜穿刺术后分别有5名（8.3%）和2名（3.3%）患者出现减速。56名（93.3%）患者在初次无应激试验时显示有心率变异性；子宫收缩和羊膜穿刺术后分别有58名（96.7%）和56名（93.3%）受试者出现心率变异性。这些差异均无统计学意义（p>0.05）。初次无应激试验时胎儿心率基线平均值为（141.00±9.35），子宫收缩后为（140.50±10.51），羊膜穿刺术后为（143.08±11.97）。子宫收缩后胎儿心率基线降低具有统计学意义（r = +0.28，p = 0.02）。这意味着较低的胎儿心率基线降低会更明显。子宫收缩和羊膜穿刺术与心率变异性、加速和减速的有无均无相关性。
