TY - CHAP M1 - Book, Section TI - Cerclage A1 - Li, Yunping A1 - Shainker, Scott A. A2 - Hess, Philip E. A2 - Li, Yunping A2 - Kowalczyk, John J. A2 - Stiles, Justin K. PY - 2023 T2 - Obstetric Anesthesia: Quick References & Practical Guides AB - Cervical insufficiency affects about 1% of all pregnancy. It is defined as painless cervical dilation in the second trimester. Cervical insufficiency can be preceded by cervical shortening (less than 2.5 cm). It is associated with an increased risk of preterm labor and birth. SN - PB - McGraw Hill CY - New York, NY Y2 - 2024/10/06 UR - obgyn.mhmedical.com/content.aspx?aid=1199673769 ER -