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Meconium-stained amniotic fluid: a risk factor for microbial invasion of the amniotic cavity
1Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, CT 06510.
Abstract:
The purpose of this study was to determine whether meconium-stained amniotic fluid is a marker for microbial invasion of the amniotic cavity. Amniocentesis was performed on 707 patients presenting with preterm labor and intact membranes. Meconium-stained amniotic fluid was present in 4.2% (30/707) of patients with preterm labor. The prevalence of positive amniotic fluid cultures was significantly higher in women with meconium-stained amniotic fluid than in women with clear fluid (33% [10/30] vs 11% [75/677]; p = 0.001; odds ratio = 4.01; 95% confidence interval = 1.6 to 9.4). Patients with meconium-stained amniotic fluid were also more likely to have failed tocolysis and delivered a preterm neonate more frequently than patients with clear fluid (83% [25/30] vs 38% (258/677); p = 0.0001; odds ratio = 8.1; 95% confidence interval = 2.9 to 24.4). We conclude that meconium-stained amniotic fluid is a risk factor for microbial invasion of the amniotic cavity and preterm delivery in women with preterm labor and intact membranes.
Insights
Meconium-stained amniotic fluid in preterm labor indicates a higher risk of amniotic cavity infection and preterm birth. This finding highlights the importance of monitoring for meconium during labor.
Area of Science:
- Obstetrics and Gynecology
- Perinatology
- Infectious Diseases
Background:
- Microbial invasion of the amniotic cavity (MIAC) is a known complication of preterm labor.
- Meconium-stained amniotic fluid (MSAF) is a common finding in labor, but its association with MIAC is not fully understood.
Purpose of the Study:
- To investigate whether MSAF serves as a clinical marker for MIAC in patients with preterm labor and intact membranes.
Main Methods:
- Amniocentesis was performed on 707 patients presenting with preterm labor and intact membranes.
- Amniotic fluid samples were cultured to detect microbial invasion.
- Clinical data, including MSAF presence, tocolysis success, and neonatal outcomes, were collected and analyzed.
Main Results:
- MSAF was present in 4.2% of patients.
- The prevalence of positive amniotic fluid cultures was significantly higher in patients with MSAF compared to those with clear fluid (33% vs 11%, p=0.001).
- Patients with MSAF were more likely to experience failed tocolysis and deliver preterm neonates (83% vs 38%, p=0.0001).
Conclusions:
- MSAF is a significant risk factor for MIAC in women with preterm labor and intact membranes.
- MSAF is associated with increased rates of failed tocolysis and preterm delivery.
- These findings suggest MSAF should prompt closer monitoring for intra-amniotic infection.