KMID : 0358420080510080842
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Korean Journal of Obstetrics and Gynecology 2008 Volume.51 No. 8 p.842 ~ p.849
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Prediction of delivery within 7 days after ultrasonographic measurement of the cervical angle and cervical Length in term pregnancies
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Kim Gwang-Jun
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Abstract
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Objective: The study was to assess the value of the cervical angle (CA) and cervical length (CL) measurement by transvaginal ultrasonography (USG) in predicting delivery within 7 days after USG in low risk singleton term pregnancies.
Methods: This prospective study included 85 singleton low risk term pregnancies. The CA and the CL were measured at 36 weeks¡¯ gestation and each week thereafter. Seven cases were lost to follow-up and finally a total of 78 cases were analyzed. The number of days to delivery was recorded. The odds ratios of the CA and CL for predicting delivery within 7 days after USG at different weeks¡¯ gestation were calculated using the Cox proportional hazard model. Receiver-operation characteristic curves were drawn to determine the cutoff values of the CA and CL.
Results: CA measurement did not predict delivery within 7 days after USG. However, there was a significant relationship between the CL and the days to delivery at 37 weeks¡¯ gestation. The optimal cutoff value in predicting the delivery within 7 days was 10 mm at 37 weeks¡¯ gestation. We could not obtain proper cutoff points at other weeks¡¯gestation.
Conclusion: CA measurement by transvaginal USG may not have a significant clinical impact on predicting delivery within 7 days after USG. However, CL measurement USG at 37 weeks¡¯ gestation can help predict the delivery within 7 days after USG.
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KEYWORD
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Cervical angle, Cervical Length, Delivery day
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