Myometrial elasticity determined by elastosonography to predict preterm labor.

Area of Science:

• Obstetrics and Gynecology
• Medical Imaging
• Reproductive Medicine

Background:

• Preterm labor remains a leading cause of neonatal morbidity and mortality.
• Accurate prediction of preterm labor is crucial for timely intervention and improved outcomes.
• Traditional methods for predicting preterm labor have limitations in sensitivity and specificity.

Purpose of the Study:

• To evaluate the combined utility of elastosonography (ES) and cervical length measurement in predicting preterm labor.
• To compare the predictive accuracy of ES versus cervical length measurement for preterm delivery.

Main Methods:

• A prospective study included 127 women between 21 to 36 weeks of gestation without preterm labor risk factors.
• Sonographic evaluation included fetal biometry, cervical length measurement, and elastosonography of the uterine myometrium.
• Tissue strain ratio was obtained using subcutaneous tissue as a reference point.

Main Results:

• Cervical length was a significant predictor (AUC=0.958), with a cut-off of 30mm yielding 92% sensitivity and 81% specificity.
• Elastosonography strain ratio was also significant (AUC=0.827), with a cut-off of 4.7 showing 79% sensitivity and 91% specificity.
• Both strain ratio and cervical length were significantly associated with preterm delivery in linear regression analysis.

Conclusions:

• Elastosonography of the uterine myometrium is significantly correlated with cervical length.
• Cervical length measurement is a more effective predictor of preterm labor than elastosonography.
• Cervical length < 30mm and strain ratio > 4.7 were identified as significant risk factors for preterm delivery.