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When we do cervical cerclage in pregnancy normally which week we do what are the indication

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"cervical cerclage" indications timing pregnancy

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I now have comprehensive information from the authoritative Creasy & Resnik's Maternal-Fetal Medicine textbook. Let me compile the answer.

Cervical Cerclage in Pregnancy

What is Cervical Cerclage?

A surgical procedure where sutures are placed around the cervix to prevent premature dilation and second-trimester pregnancy loss or preterm birth, primarily used for cervical insufficiency.

Three Types & Their Timing

1. History-Indicated Cerclage (HIC)

Timing: 11–15 weeks (ideally before 14 weeks of gestation)
Placed based purely on obstetric history, before any cervical changes are observed in the current pregnancy.
Indications:
  • Singleton gestation with a history of painless cervical dilation leading to second-trimester pregnancy loss
  • Prior exam-indicated cerclage
  • Prior ultrasound-indicated cerclage with subsequent preterm delivery ≤32 weeks (high recurrence risk)
  • ≥3 prior second-trimester losses or early preterm births (strongest RCT evidence)
Note: A prior cerclage alone does not automatically indicate cerclage in the current pregnancy — the underlying indication must be re-evaluated each time.
Transabdominal HIC is recommended (prepregnancy or before 13 weeks) when:
  • Prior failed history-indicated transvaginal cerclage with preterm birth <33 weeks
  • Little/no accessible cervix vaginally (due to müllerian anomaly or prior cervical surgery)

2. Ultrasound-Indicated Cerclage (UIC)

Timing: Before 24 weeks (16⁰⁄₇ – 23⁶⁄₇ weeks)
Placed when cervical shortening is detected on transvaginal ultrasound in a high-risk patient.
Indications:
  • Singleton gestation with prior spontaneous preterm birth (16⁰⁄₇ – 36⁶⁄₇ weeks) AND
  • Current transvaginal cervical length <25 mm on second-trimester ultrasound
  • No chorioamnionitis, abruption, or other contraindication
Evidence: Meta-analysis of 5 RCTs shows cerclage reduces preterm birth <35 weeks by 30% and perinatal morbidity/mortality by 36% in this group.
For singletons with short cervix but no prior preterm birth: vaginal progesterone is preferred; cerclage is considered only if cervical length <15 mm (limited evidence).
Not recommended in multiple gestations regardless of cervical length.

3. Physical Exam–Indicated Cerclage (PEIC) — "Rescue Cerclage"

Timing: Before 24 weeks (16⁰⁄₇ – 23⁶⁄₇ weeks)
Placed urgently when cervical dilation is found on examination.
Indications:
  • Singleton or twin gestation with painless cervical dilation ≥1 cm detected on speculum or digital exam
  • No fetal demise, active labor, rupture of membranes, chorioamnionitis, or abruption
Special considerations:
  • Amniocentesis should be considered before placement (especially if membranes are visible, cervix ≥2 cm dilated, or ultrasound suggests intra-amniotic infection) to rule out subclinical infection
  • Perioperative indomethacin is recommended
  • Hospital admission for 12–24 hours post-procedure is standard

Summary Table

TypeIndicationTiming
History-Indicated (HIC)Prior 2nd-trimester loss from painless dilation; prior cerclage with PTB ≤32 wks11–15 weeks
Transabdominal HICFailed transvaginal HIC with PTB <33 wksPre-pregnancy or <13 weeks
Ultrasound-Indicated (UIC)Prior PTB + current CL <25 mm16–24 weeks
Physical Exam–Indicated (PEIC)Painless cervical dilation on examBefore 24 weeks

Contraindications to Cerclage

  • Active labor
  • Ruptured membranes
  • Chorioamnionitis
  • Placental abruption
  • Fetal demise or lethal fetal anomaly
  • Gestational age ≥24 weeks (generally)

Important Notes

  • Cerclage is not beneficial in multiple gestations for primary prevention
  • Continue progesterone therapy even after cerclage placement in patients with prior spontaneous PTB
  • Routine bed rest is NOT recommended post-cerclage
  • Cerclage is typically removed at 36–37 weeks of gestation
Source: Creasy & Resnik's Maternal-Fetal Medicine: Principles and Practice, Table 38.4 & Chapter 38
A 2025 systematic review (PMID: 40541862) comparing cerclage placement guidelines across societies is the most recent evidence synthesis — worth reviewing for any updates to specific threshold criteria.
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