Tehran University Medical Journal

Background: The aim of this study was to statistically evaluate the hypothesis that the presence of meconium-stained amniotic fluid is associated with postpartum maternal infection.
Methods: This prospective cohort study included 573 term pregnant women in labor, with no other medical problems, that underwent cesarean section for pregnancy termination. Women with prolonged active-phase labor, prolonged rupture of membranes, complicated cesarean section and pre-operative infections were excluded from this study.
The subjects were divided into two groups: 280 women with meconium-stained amniotic fluid (M group), and 293 women with clear amniotic fluid (C group). A comparison was done regarding postpartum fever, endometritis and wound infection between the two groups. Student's t-test and chi square test were used for data analysis, along with linear regression, with p<0.05 indicating significance.
Results: Among the 573 women, a total of 82 women (14%) had fever after cesarean 42 women from the M group, and 40 women from the C group (p= 0.3). Among the 82 women who had fever, 33 women had continuous fever, 6.5% in group M and 2.7% in group C (p<0.05, RR: 1.98, 95% CI 1.3-3.1). Among the 573 women, 4% developed endometritis 5% in group M and 2% in group C (p<0.05, RR: 2.3, 95%, CI 1.3-3.4). Similarly, among the 573 women, a total of 5 women (1%) developed wound infection, 1.7% in group M and 0.68% in group C (p=0.7).
Conclusion: Meconium-stained amniotic fluid is associated with increased postpartum infection independent of other risk factors for infection.