Cervical insufficiency revisited: a proposal for a new treatment-aligned definition

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Reproductive Medicine

Background:

• Traditional definitions of cervical insufficiency (CI) focus on historical clinical presentation of painless cervical dilation and recurrent second-trimester pregnancy loss.
• Current obstetric practice increasingly utilizes ultrasound for cervical length surveillance and evidence-based cerclage indications, rather than retrospective diagnosis.

Purpose of the Study:

• To propose a revised definition of cervical insufficiency that aligns with current evidence-based indications for cervical cerclage, a method for preventing preterm birth.
• To enhance diagnostic clarity and consistency in clinical care and research for cervical insufficiency.

Main Methods:

• Review of contemporary obstetric practices, including ultrasound-based cervical length surveillance.
• Analysis of evidence-based criteria for cervical cerclage placement (history-indicated, ultrasound-indicated, physical examination-indicated).

Main Results:

• Treatment thresholds for cerclage have become the primary determinant for diagnosing clinically significant cervical dysfunction, supplanting historical definitions.
• A proposed definition of CI for singleton gestations is a condition where a patient meets established criteria for cerclage placement, excluding active preterm labor or intra-amniotic infection.

Conclusions:

• Redefining cervical insufficiency based on cerclage criteria better reflects modern obstetric practice.
• The proposed treatment-aligned definition aims to improve diagnostic clarity and consistency in managing preterm birth prevention.