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Transvaginal sonographic cervical length changes during normal pregnancy.
Dandolo Gramellini1, Stefania Fieni, Enzo Molina
1Department of Obstetrics, Gynecology, and Neonatology, University of Parma, Italy.
Summary
Cervical length decreases linearly with gestational age in both nulliparous and parous women. This study found no significant difference in cervical length between these groups, suggesting universal reference ranges may aid preterm birth management.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Reproductive Health
Background:
- Cervical length is a key indicator in pregnancy.
- Understanding its changes with gestational age is crucial for managing preterm birth risks.
- Previous studies may not have adequately compared nulliparous and parous women.
Purpose of the Study:
- To investigate the relationship between cervical length and gestational age.
- To compare cervical length in nulliparous versus parous women during normal pregnancy.
Main Methods:
- A cross-sectional study of 321 pregnant women (185 nulliparous, 136 multiparous).
- Inclusion criteria: sonographic confirmation of gestational age by 12 weeks, no preterm birth risk factors, uncomplicated pregnancy.
- Cervical length measured sonographically, accounting for cervical curvature.
Main Results:
- A strong linear relationship was found between gestational age and cervical length (R=0.92, R²=0.85, P<.001).
- No statistically significant differences in cervical length were observed between nulliparous and multiparous women.
- Cervical length demonstrated a progressive, linear reduction from 10 to 40 weeks gestation in both groups.
Conclusions:
- Cervical length is comparable between nulliparous and multiparous women throughout pregnancy.
- A progressive, linear reduction in cervical length occurs between 10 and 40 weeks.
- Universal reference ranges for cervical length may be more beneficial for preterm birth prevention and management than single cut-off values.