When should cerclage sutures be removed during pregnancy?

When to Release Cerclage Sutures

In uncomplicated pregnancies with cerclage, remove the suture at 36-37 weeks of gestation; however, after preterm prelabor rupture of membranes (PPROM), either immediate removal or retention in situ are both reasonable options based on shared decision-making, as neither approach significantly affects maternal or neonatal outcomes.

Standard Timing for Elective Cerclage Removal

For women with cerclage who reach late preterm/term gestation without complications:

• Remove cerclage electively at 36-37 weeks of gestation 1, 2
• The mean interval from elective removal to spontaneous delivery is approximately 14 days 2
• Only 11% of women deliver within 48 hours of elective cerclage removal 2
• Women with ultrasound-indicated cerclage are more likely to deliver within 48 hours compared to history-indicated cerclage (odds ratio 5.14) 2

Clinical Pearl: Women should be counseled that despite cerclage removal at 36-37 weeks, immediate delivery is uncommon. Most will not deliver for approximately 2 weeks after removal.

Cerclage Management After PPROM

The most clinically challenging scenario involves cerclage management when PPROM occurs:

Evidence-Based Approach

Both immediate removal (<24 hours) and retention in situ are acceptable management strategies 3. The 2024 SMFM guidelines (endorsed by ACOG) provide a GRADE 2C recommendation that it is reasonable to either remove the cerclage or leave it in situ after discussing risks and benefits with shared decision-making 3.

Key Evidence Supporting Either Approach

The only randomized controlled trial (RCT) evaluating this question enrolled 56 participants with PPROM at 22-32 weeks and was stopped early for futility 3:

• No difference in 1-week pregnancy prolongation: 45.8% (retention) vs 56.2% (removal), p=0.58
• No significant increase in chorioamnionitis: 41.6% vs 25.0%, p=0.25
• No significant increase in postpartum endometritis: 12.5% vs 3.1%, p=0.30
• No difference in composite neonatal morbidity: 56% vs 50%, p=0.91
• No difference in perinatal mortality: 16% vs 12%, p=0.52

Retrospective Data Shows Mixed Results

Cerclage retention may prolong latency but with potential infection risk:

• One study showed 70.4 hours longer latency with retention (p=0.009) 4
• Another study demonstrated 10.1 vs 5.0 days latency (p<0.001) with delayed removal 5
• However, trends toward higher chorioamnionitis rates (60% vs 45%) were observed with retention 4
• Some retrospective studies show increased infectious morbidity with retention 3

Decision-Making Algorithm for PPROM with Cerclage

When PPROM occurs with cerclage in situ:

1. Assess for contraindications to retention:

   • Active labor
   • Clinical chorioamnionitis
   • Non-reassuring fetal status
   • If any present → Remove cerclage immediately

2. If no contraindications exist:

   • Counsel patient on equipoise: neither approach clearly superior
   • Discuss potential benefits of retention: possible longer latency (days to weeks)
   • Discuss potential risks of retention: possible increased infection risk (though not statistically proven)
   • Either immediate removal OR retention acceptable based on patient preference

3. If retention chosen:

   • Close monitoring for signs of infection (maternal fever, elevated inflammatory markers, fetal tachycardia)
   • Maintain low threshold for removal if infection suspected
   • Follow standard PPROM management (antibiotics at ≥24 weeks per guidelines) 3

Special Considerations

Physical Examination-Indicated vs Ultrasound-Indicated Cerclage

Women with physical examination-indicated (rescue) cerclage are significantly more likely to deliver within 72 hours of removal compared to ultrasound-indicated cerclage (80% vs 39%, p=0.04) 1. This should inform timing discussions for elective removal.

Timing of Elective Removal: 36 vs 37 Weeks

Among women with elective cerclage, there is no significant difference in delivery within 72 hours between removal at 36 weeks versus 37 weeks (31% vs 58%, p=0.30) 1. Removal at 36 weeks is appropriate and most commonly practiced 1.

Common Pitfalls to Avoid

• Do not routinely remove cerclage immediately after PPROM without discussing retention as an option—the evidence supports equipoise
• Do not retain cerclage in the presence of clinical infection—this is a clear contraindication
• Do not counsel patients that cerclage removal at 36-37 weeks will trigger immediate labor—most women have a 2-week interval to delivery
• Do not use prolonged or repeated antibiotic courses beyond standard PPROM protocols when retaining cerclage—this compromises antibiotic stewardship 3