Obstetrics and Gynecology International / 2013 / Article / Tab 2 / Review Article
Adjunctive Therapies to Cerclage for the Prevention of Preterm Birth: A Systematic Review Table 2 Studies reporting the use of reinforcing cerclage.
Study Design Sample Size Average cervical length at diagnosis (mm) Cerclage type‡ Mean gestational age (weeks) initial cerclage Mean gestational age (weeks) additional cerclage Total number sutures placed Mean latency to delivery (weeks) Mean gestational age (weeks) at delivery Outcome Overall rate of PTB Fox et al., 1998 [15 ] Prospective cohort 12/26 n/a McDonald 14* 20 (18–24) 2–4 13 (4–19) 34 (22–39) PTB < 37 wga LB 75% (<37) Baxter et al., 2005 [14 ] Retrospective cohort 5/24 14.3 ± 3.6 McDonald 124/7 191/7 2 14/7 20.8 ± 2.7 PTB < 35 wga PTB < 24 wga 100% (<35) 80% (<24)
Simcox and Shennan, 2012 [16 ] Retrospective cohort 13/25 7.2 (0–15) McDonald 145/7 193/7 2 64/7 260/7 ± 5 1/7 PTB < 32 wga PTB < 24 wga 92% (<32) 38% (<24) Song et al., 2011 [17 ] Retrospective cohort 11/22 n/a McDonald 17.0 ± 2.9 21.7 ± 2.3 2 5.1 ± 4.2 26.8 ± 5.0 LB BW
n/a: not available, PTB: preterm birth, wga: weeks gestational age, LB: livebirth, and PM: perinatal mortality.
Documented history-indicated cerclage was performed at 14 weeks gestation. Fifteen cases did not have documented gestational ages at initial cerclage placement.