Maternal outcomes (PPROM, chorioamnionitis, cervical laceration, caesarean section and cervical length)
The rate of PPROM was found to be significantly lower in the Shirodkar group when compared to the McDonald group (RR 0.87, 95% CI 0.77 – 0.99). The Shirodkar technique group also showed a significantly greater increase in the post cerclage cervical length (mean difference 5.25, 95% CI 4.68–5.83).
There was no difference between the two techniques in the rates of chorioamnionitis (RR 0.96, 95% CI 0.90 – 1.02), cervical laceration (RR 1.04, 95% CI 0.98 – 1.10), or caesarean section (RR 1.07, 95% CI 0.94 – 1.22, Table 3).