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).