Background: There are few detailed reports on the association between histologic chorioamnionitis(hCAM)and short-term outcomes in very low birth weight infants(VLBWI).
Methods: We enrolled 17,806 VLBWI registered with Neonatal Research Network Japan between 2003 and 2012. Multivariable logistic regression models were used to evaluate the association between hCAM and short-term outcomes. Stratified analyses by four gestational age groups, i.e., 22-24, 25-27, 28-30 and 31-33 weeks, were also conducted. Additionally, the effect across the Blanc classification were examined.
Results: We detected the significant association between hCAM and lower incidence of respiratory distress syndrome(RDS) (adjusted odds ratio[aOR]=0.60, p<0.001), patent ductus arteriosus(PDA) (aOR=0.87, p<0.001), and mortality(aOR=0.72, p<0.001), and between hCAM and increased incidence of persistent pulmonary hypertension of the newborn(aOR=1.16, p=0.045), chronic lung disease(CLD) (aOR=1.57, p<0.001), severe CLD(aOR=1.16, p=0.007), intraventricular hemorrhage(IVH) (aOR=1.11, p=0.042), sepsis (aOR=1.20, p=0.004), and home oxygen therapy(HOT) (aOR=1.55, p<0.001). Stratified analyses indicated that those results were mainly driven by the younger gestational age groups. We found that hCAM with stage 3 Blanc classification was associated with lower incidence of RDS(aOR=0.39, p<0.001), PDA(aOR=0.65, p<0.001)and death(aOR=0.69, p<0.001), and increased incidence of CLD(aOR=1.93, p<0.001)and HOT(aOR=2.17, p<0.001), and that hCAM with stage 1 Blanc classification was associated with higher incidence of PDA (aOR=1.23, p=0.001), IVH(aOR=1.37, p<0.001)and retinopathy of prematurity(aOR=1.18, p=0.035) compared to patients without hCAM.
Conclusion: The effects of hCAM could differ across the gestational age and the Blanc classification.
View full abstract