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Korean Journal of Obstetrics & Gynecology 2003;46(11):2197-2202.
Published online November 1, 2003.
The Value of Transvaginal Ultrasonographic Measurement of Cervical Length for Prediction of Preterm Delivery in Patients with Preterm Labor.
Su Ran Choi, Soon Ha Yang, Ji Soo Lee, Yong Soo Seo, Jong Hwa Kim
Department of Obstetrics and Gynecology, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea.
Abstract
OBJECTIVE
The aim of this study is to evaluate the value of vaginal ultrasonographic cervical length in prediction of preterm delivery in patients with preterm labor. METHODS: One-hundred twenty-nine women in preterm labor at 24-34 weeks of gestation were studied retrospectively. Transvaginal ultrasonography for measurement of cervical length was performed at the time of admission. Receiver-operating characteristic (ROC) curve analysis, partial correlation coefficient, and multiple logistic regression analysis were used for statistical analysis. RESULTS: The mean gestational age at admission was 30.2 +/- 2.5 weeks and the mean gestational age at delivery was 35.7 +/- 3.9 weeks. The median admission-to-delivery interval was 864 hours (24-2616). ROC curve analysis showed a significant relationship between cervical length and preterm delivery (area under the curve=0.82, p<0.001). The diagnostic indices of cervical length (cut-off value 2.5 cm) by ROC curve were sensitivity of 86%, specificity of 64%, and positive and negative predictive value of 54% and 90%. Multiple logistic regression analysis indicated that cervical length was an independent predictor of preterm delivery after adjustment of confounding factors (x2=0.326, p<0.01). Admission-to-delivery interval in patients with cervical length >or=2.5 cm was significantly shorter than that in patients with cervical length >2.5 cm. CONCLUSION: Transvaginal ultrasonographic measurement of cervical length is a useful predictor of preterm delivery in patients with preterm labor and intact membranes.
Key Words: Transvaginal ultrasonography, Cervical length, Preterm delivery, Preterm labor


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