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| Value of cervical length measured by ltrasonographic for predicting emergency cesarean section and hemorrhage of pregnent women with placenta previa |
| Yangxin Maternal and Child Health Care Hospital, Hubei Province, 435200 |
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Abstract Objective: To investigate the value of cervical length (CL) measured by ltrasonographic for predicting emergency cesarean section (CS) and hemorrhage of pregnent women with placenta previa. Methods: The data of 102 pregnant women with placenta previa from January 2016 to October 2018 were retrospectively analyzed, and they were divided into group A (32 women with emergency CS) and group B (70 women with selective CS). The relationship between emergency CS and CL of women was analyzed. Results: The average gestational weeks when delivery of women and the percentage of primipara in group A were significant lower than those of women in group B, but the percentage of women with their neonatal weight <2000g and the rate of abnormal vaginal bleeding before onset labour of women in group A were significant higher (P<0.05). The CL of women during 32-34 gestational weeks in group A was shorter than that of women in group B (P<0.05). When the CL changed was more than 6.3mm, ROC curve analysis showed that the sensitivity, the specificity, the positive predictive value, the negative predictive value, and AUC were 65.6%, 78.6%, 58.3%, 87.7% and 0.786 (95% CI: 0.688-0.885), respectively, which indicated that CL value had certain predicting value for CS. Multivariate logistic regression analysis showed that abnormal vaginal bleeding, and CL changes, and CL＜25mm during the third trimester of pregnancy were significantly correlated with emergency CS. Conclusion: The shortening of CL measured by transvaginal ultrasound of asymptomatic pregnant women implies the possibility of massive hemorrhage. The excessive change of CL from the second to the third trimesters of pregnancy indicates the possibility of emergency CS.
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