Laboratory Medicine ›› 2024, Vol. 39 ›› Issue (1): 53-59.DOI: 10.3969/j.issn.1673-8640.2024.01.010

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Role of Group B Streptococcus detection in pregnant women combined with fetal cord blood neutrophil CD64 index for predicting neonatal infection with premature rupture of membranes

TAN Haiyan, JIANG Yurong   

  1. Department 1 of Obstetrics,Hunan Maternal and Child Health Care Hospital,Changsha 410000,Hunan,China
  • Received:2023-05-22 Revised:2023-10-19 Online:2024-01-30 Published:2024-03-04

Abstract:

Objective To investigate the role of Group B Streptococcus(GBS) detection in pregnant women combined with fetal cord blood neutrophil CD64 index for predicting neonatal infection with premature rupture of membranes(PROM). Methods A total of 170 full-term PROM neonates in Hunan Maternal and Child Health Care Hospital from March 2022 to December 2022 were enrolled as observation group,and 170 full-term PROM neonates were classified into infected group(48 cases) and uninfected group(122 cases) according to neonatal infection. The general data of neonates were compared to analyze the relationship between neonatal PROM infection and clinical characteristics of neonates. The factors for neonatal PROM infection were analyzed by multivariant Logistic regression analysis. A line graph prediction model was constructed and verified. The predictive efficacy of GBS detection combined with fetal cord blood neutrophil CD64 index was evaluated by receiver operating characteristic(ROC) curve. Results The time from PROM to delivery,chorioamnionitis,GBS positivity,the number of vaginal finger examination,prenatal antibiotic usage,5 min Apgar score<7,amniotic fluid contamination and fetal cord blood neutrophil CD64 index had statistical significance between the 2 groups(P<0.05). The time from PROM to delivery,chorioamnionitis,GBS positivity,the number of vaginal finger examination and fetal cord blood neutrophil CD64 index were the risk factors for neonatal PROM infection(P<0.05). The total score of the above 5 indexes in the line graph prediction model was 294,corresponding to 73.15% of the risk of infection. The results of interaction analysis showed that fetal cord blood neutrophil CD64 index and GBS positivity had positive additive interaction on neonatal PROM infection(P<0.001). The areas under curves of fetal cord blood neutrophil CD64 index and GBS positivity single and combined determinations were 0.763,0.807 and 0.847,respectively. Conclusions The detection of GBS in pregnant women combined with fetal cord blood neutrophil CD64 index has a high predictive value for neonatal PROM infection. The time from PROM to delivery,chorioamnionitis and the number of vaginal finger examination are risk factors for neonatal PROM infection,which should be paid attention in clinic to reduce the risk of infection.

Key words: Group B Streptococcus, Neutrophil CD64, Premature rupture of membranes, Neonatal infection

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