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RESEARCH OF PREDICTING THE OUTCOME OF INDUCTION OF LABOR IN PREGNANT WOMEN PAST THEIR EXPECTED DUE DATE BY MEASURING CERVICAL LENGTH TRANSVAGINALLY
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Abstract
Introduction: Induction of labor is a routine obstetric procedure in the world and the cervical ripeness is one of factors that affects the success of induction of labor. Cervical maturity is expressed by the Bishop score. However, the Bishop score has some disadvantages because it is subjective to the examiners. Nowadays, the cervical length measured by transvaginal ultrasound (TVS) to predict the success of induction of labour is increasingly used. Therefore, this study was carried out to analyze the relationship between cervical length measured by transvaginal ultrasound and the outcome of labor induction in pregnant women past their expected due date. Method: 108 pregnant women who were past their expected delivery date but had not gone into labor were studied. Cervical length was measured by transvaginal ultrasound. Successful induction of labor occurs when the cervix dilates 3cm within 24 hours from the time of induction of labor. Data were processed by using SPSS 20 software. Result: 75% of studied woman induced labor successfully, mean cervical length measured by transvaginal ultrasound was 27.6 ± 6.4 (mm), while mean Modified Bishop score was 2, 9 ± 1.2. The best cut off point for predicting successful induction of labor was <= 29mm for cervical length and <=3 for Modified Bishop score. The ROC curve showed that compared to TVS cervical length, Modified Bishop score was the best parameter for predicting successful induction of labor. Conclusion: Transvaginal sonographic cervical length measurement anh Moddified Bishop score can be used as an adjunct tool to the traditional Bishop score for predicting successful labor induction.
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References
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