Cervical cerclage for short cervix at 24 to 26 weeks of gestation: systematic review and meta-analysis of randomized controlled trials using individual patient-level data.

Objective: This study aimed to determine whether cervical cerclage for a transvaginal ultrasound-detected short cervical length after 24 weeks of gestation in singleton pregnancies reduces the risk for preterm birth.

Data Sources: Ovid MEDLINE, Scopus, and the Cochrane Central Register of Controlled Trials were searched using the following terms: "cerclage, cervical," "uterine cervical incompetence," "obstetrical surgical procedures," "cervix uteri," "randomized controlled trial," and "controlled clinical trial."

Study Eligibility Criteria: All randomized controlled trials comparing cerclage placement with no cerclage in singleton gestations with a transvaginal ultrasound-detected short cervical length ≤25 mm between 24+0/7 and 29+6/7 weeks of gestation were eligible for inclusion.

Cerclage for sonographic short cervix in singleton gestations without prior spontaneous preterm birth: systematic review and meta-analysis of randomized controlled trials using individual patient-level data.

Objective: The aim of this systematic review and meta-analysis was to quantify the efficacy of cervical cerclage in preventing preterm birth (PTB) in asymptomatic singleton pregnancies with a short mid-trimester cervical length (CL) on transvaginal sonography (TVS) and without prior spontaneous PTB.

Methods: Electronic databases were searched from inception of each database until February 2017. No language restrictions were applied.

Cerclage for short cervix in twin pregnancies: systematic review and meta-analysis of randomized trials using individual patient-level data.

Objective: To evaluate the efficacy of cerclage for preventing preterm birth in twin pregnancies with a short cervical length.

Design: We performed an individual patient data meta-analysis. Searches were performed in electronic databases.

Effectiveness of cerclage according to severity of cervical length shortening: a meta-analysis.

Objectives: To estimate the effectiveness of cerclage according to degree of cervical length (CL) shortening.

Methods: A meta-analysis was carried out of trials of women with singleton gestations and second-trimester transvaginal sonographic CL < 25 mm randomized to cerclage or no cerclage. The degree of CL shortening was correlated to the efficacy of cerclage in preventing preterm birth.