Intraamniotic infection in low-birth-weight infants

Area of Science:

• Obstetrics and Gynecology
• Neonatology
• Infectious Diseases

Background:

• Intraamniotic infection (IAI) is a significant complication during childbirth.
• The impact of IAI on neonates varies, particularly concerning birth weight.

Purpose of the Study:

• To compare neonatal and maternal infectious morbidity and mortality in IAI cases involving low-birth-weight infants (<2500 g) versus normal-birth-weight infants (≥2500 g).
• To identify differences in microbiological isolates from amniotic fluid between these two groups.

Main Methods:

• Prospective evaluation of 404 clinically diagnosed cases of IAI.
• Categorization of patients based on neonatal birth weight: <2500 g (low-birth-weight) and ≥2500 g (normal-birth-weight).
• Analysis of neonatal sepsis incidence, sepsis-related mortality, and amniotic fluid microbial cultures.

Main Results:

• The low-birth-weight group showed a significantly higher incidence of sepsis (16.2% vs. 4.1%, P = .005) and death from sepsis (10.8% vs. 0%, P < .001).
• No increased prevalence of group B streptococci, Escherichia coli, or enterococci was found in the low-birth-weight group.
• A significant increase in gram-negative anaerobes was observed in amniotic fluid from low-birth-weight pregnancies with IAI (59.5% vs. 31.6%, P = .001).

Conclusions:

• IAI significantly increases the risk of sepsis and mortality in low-birth-weight neonates.
• The increased risk in low-birth-weight infants is associated with a higher prevalence of gram-negative anaerobes in amniotic fluid.
• Further research into targeted interventions for gram-negative anaerobes in IAI may be warranted for high-risk neonates.