Effect of histologic chorioamnionitis on clinical outcomes in preterm infants with a gestational age less than 34 weeks:a propensity score matching study / 天津医药

ABSTRACT

Objective To explore the effect of histologic chorioamnionitis(HCA)on clinical outcomes of preterm infants with a gestational age<34 weeks.Methods This retrospective study enrolled 497 cases of premature infants with a gestational age<34 weeks and their mothers who were hospitalized in the Qingdao Women and Children's Hospital from January 2019 to December 2022.According to whether the pathology of placenta was diagnosed as HCA or not,patients were divided into the HCA group(257 cases)and the control group(240 cases).The propensity score matching analysis was performed at a ratio of 1︰1.Ten items were matched,including gestational age,birth weight,gender,cesarean section,gestational diabetes mellitus,gestational hypertension,placental abruption,premature rupture of membranes,use of antenatal glucocorticoids and assisted reproductive technology.The differences of major complications and survival rate were compared between the two groups.Results A total of 156 pairs premature infants were successfully matched.Before matching,the incidences of early-onset sepsis(EOS)and bronchopulmonary dysplasia(BPD)were higher in the HCA group than those of the control group(26.1%vs.7.5%,45.1%vs.25.8%,P＜0.01).The incidence of EOS was higher in the HCA group than that of the control group after matching(24.4%vs.7.7%,P＜0.01),and the incidence of neonatal respiratory distress syndrome(NRDS)was significantly lower in the HCA group than that in the control group after matching(34.0%vs.46.8%,P＜0.05).There were no significant differences in survival rate and the incidences of other complications between the two groups before and after matching(P>0.05).Conclusion Preterm infants exposed to HCA have a higher risk of EOS and a lower risk of NRDS after propensity score matching.HCA has no significant effect on survival rate and other complications of premature infants.