Cervical HI-RTE elastography and pregnancy outcome: a prospective study

Area of Science:

• Obstetrics and Gynecology
• Medical Imaging
• Reproductive Medicine

Background:

• Cervical length is a known predictor of preterm birth.
• Elastography offers a novel method to assess cervical tissue properties.
• Real-time tissue elastography (HI-RTE) provides quantitative elasticity measurements.

Purpose of the Study:

• To evaluate the utility of cervical elastography measurements in predicting pregnancy outcomes.
• To determine the relationship between cervical elasticity and adverse obstetrical events.
• To assess the diagnostic performance of elastography index in early pregnancy.

Main Methods:

• A prospective longitudinal study involving 72 pregnant women.
• Cervical elasticity was assessed using Hitachi real-time tissue elastography (HI-RTE) across three trimesters.
• The primary outcome measure was the elastography index (EI) derived from cervical elastogram color-coding.

Main Results:

• A significantly lower EI was observed in the first trimester for women with unfavorable outcomes compared to those delivering at term (EI=0.51 vs. 0.59, P=0.037).
• First-trimester posterior lip color indicating a 'hard cervix' had a high negative predictive value (NPV) of 83.8%.
• An EI threshold of ≤0.38 in the first trimester demonstrated 98.0% specificity and 80.9% NPV for adverse outcomes, with increased risk when combined with short cervical length (HR 8.87).

Conclusions:

• Cervical elastography index is significantly associated with unfavorable obstetrical outcomes.
• This association is independent of cervical length, suggesting elastography provides unique predictive information.
• HI-RTE is a promising tool for early pregnancy risk assessment and prediction of adverse outcomes.