Quantitative Stress-Strain Cervical Elastography Characterizes Cervical Remodeling in Pregnancy

Area of Science:

• Biomedical Engineering
• Obstetrics and Gynecology
• Medical Imaging

Background:

• Current elastography methods lack repeatability across examiners and patients.
• Standardized methods are needed to track cervical remodeling and establish population norms.
• Biomechanical changes in the cervix during pregnancy require innovative quantification techniques.

Purpose of the Study:

• To evaluate a novel quantitative, synchronized stress-strain cervical elastography system (FQ-CES) for longitudinal quantification of cervical remodeling in humans.
• To describe cervical remodeling patterns in pregnancies resulting in term and preterm birth.
• To assess the system's ability to provide numerically quantifiable and comparable measurements across populations.

Main Methods:

• A prospective, longitudinal, multicenter study involving pregnant individuals with singleton gestations.
• Utilized the FQ-CES device to synchronize quantified stress and strain for direct biomechanical cervical softness calculation.
• Employed linear mixed effects models to analyze cervical softening patterns across pregnancy and compare outcomes between term and preterm births.
• Compared elastography-derived cervical softness changes with longitudinal cervical length measurements.

Main Results:

• The FQ-CES system demonstrated statistically significant, steady cervical softening throughout pregnancy (approx. 7.4% per week).
• Nulliparous individuals had significantly softer cervices at the start of pregnancy compared to multiparous individuals (33% softer, P<.001).
• Individuals with preterm birth exhibited softer initial cervices and a flatter softening slope compared to those with term birth, who had firmer cervices and a steeper slope.
• Cervical length measurements did not differ significantly between term and preterm birth groups.

Conclusions:

• Quantitative, synchronized stress-strain cervical elastography can reliably quantify longitudinal cervical remodeling patterns in human pregnancies.
• The FQ-CES system detects more significant differences between term and preterm birth outcomes than traditional cervical length measurements.
• This technology represents a significant advancement for improving preterm birth risk prediction.