The Iranian Journal of Obstetrics, Gynecology and Infertility

The Iranian Journal of Obstetrics, Gynecology and Infertility

Umbilical Artery Blood Acidity at Different Gestational Ages in Mothers with Ruptured Amniotic Sac in Deliveries at Imam Sajjad Hospital, Yasuj

Document Type : Original Article

Authors
Sajad Hasanzadeh 1
Elahe Masnavi 2
Narges Roostaei 3
Maral Forghanifar 4
Sima Dortaj 5
Fardin Hooshyar 6
1 Associate Professor, Department of Internal Medicine, Social Determinants of Health Research Center, Faculty of Medicine, Yasuj University of Medical Sciences, Yasuj, Iran.
2 Assistant Professor, Department of Obstetrics and Gynecology, Social Determinants of Health Research Center, Faculty of Medicine, Yasuj University of Medical Sciences, Yasuj, Iran.
3 Assistant Professor, Department of Health, School of Health, Yasouj University of Medical Sciences, Yasouj, Iran.
4 PhD Student in Reproductive Health, Student Research Committee, School of Nursing and Midwifery, Isfahan University of Medical Sciences, Isfahan, Iran.
5 M.Sc. student of Midwifery, Faculty of Medicine, Yasouj University of Medical Sciences, Yasouj, Iran.
6 Medical Doctoral Student, Faculty of Medicine, Yasouj University of Medical Sciences, Yasouj, Iran.
10.22038/ijogi.2025.84689.6296
Abstract
Introduction: Many factors predispose pregnant mothers to premature rupture of membranes and premature birth. Premature rupture of membranes has complicated approximately 10% of pregnancies. Examination of umbilical cord blood gases is performed to evaluate the fetal response to labor stress. Severe acidemia can increase neonatal mortality and damage the newborn's neurodevelopment. Given the importance of the problem, the present study was conducted with aim to determine and compare the acidity of umbilical artery blood at different gestational ages with ruptured amniotic sac.
Methods: This descriptive-analytical cross-sectional study was conducted on all mothers with rupture of membranes who referred to Imam Sajjad Yasouj Hospital in 2022. The women were placed in three groups: “before 37 weeks”, “after 37 weeks before starting pain and rupture” and “term”. Data related to gestational age, infant gender, maternal age, multiples, Apgar score at 1 minute and 10 minutes, maternal underlying disease, type of delivery and umbilical cord arterial blood pH were extracted from their records. Data analysis was performed using SPSS statistical software (version 28) and one-way ANOVA, Kruskal-Wallis and post hoc tests with Bonferroni correction. P<0.05 was considered significant.
Results: Based on the analyses, there was a significant difference between pH of the umbilical artery in rupture of the amniotic sac at term and before term (P=0.003). There was a significant difference in distribution of umbilical artery acidity at different times of rupture of the amniotic sac (P=0.013). The distribution of umbilical artery pH acidity in vaginal delivery had a statistically significant difference (P=0.001). However, no statistically significant difference was observed in cesarean deliveries (P=0.493). The distribution of umbilical artery acidity in female newborns, unlike male newborns, had a statistically significant difference (P=0.013).
Conclusion: The blood gases of the newborns in vaginal delivery were different in the three groups and there was a relationship between the Apgar score and umbilical artery blood gases in the first hour of birth. Given the importance of umbilical cord pH, it is recommended to measure umbilical artery pH to determine the prognosis of stressed neonates in vaginal and cesarean delivery.
Keywords
Blood Acidity
Fetal Umbilical Artery
Rupture of Membranes
Preterm Labor
Subjects
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The Iranian Journal of Obstetrics, Gynecology and Infertility
Volume 29, Issue 1
March 2026
Pages 18-30