Counterindication of external cephalic version.
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Contraindications of External Cephalic Version (ECV)
External cephalic version is the manual rotation of a malpresenting fetus (usually breech or transverse lie) to a vertex position through the maternal abdominal wall, typically performed at 36+ weeks gestation with tocolysis and continuous fetal monitoring.
Absolute Contraindications
These conditions make ECV unsafe or impossible to perform - cesarean delivery would already be planned or emergent delivery may be needed:
| Contraindication | Rationale |
|---|---|
| Placenta previa (or any other indication for cesarean aside from presentation) | Manipulation risks catastrophic hemorrhage |
| Major uterine anomaly (e.g., bicornuate uterus, large fibroids) | Abnormal anatomy prevents successful version |
| Major fetal anomaly | May preclude vertex delivery regardless |
| Non-reassuring fetal monitoring (abnormal CTG/NST) | Fetus cannot tolerate the physiological stress of version |
| Multiple gestation | Risk of cord entanglement; version rarely indicated |
| Abruptio placentae | Uterine manipulation risks worsening abruption and fetal compromise |
| Ruptured membranes | Loss of amniotic fluid makes version mechanically impossible and risks cord prolapse |
Relative Contraindications
These conditions increase risk but do not absolutely preclude ECV - the clinical decision requires individual risk-benefit analysis:
| Contraindication | Clinical Note |
|---|---|
| Suspected IUGR | Compromised fetus may not tolerate the stress |
| Oligohydramnios | Reduced fluid makes manipulation difficult and risky; AFI correlates with success rate |
| Maternal cardiac disease | Hemodynamic stress during the procedure |
| Maternal hypertension | Risk of placental abruption with uterine manipulation |
| Previous cesarean scar (prior uterine surgery) | Small studies suggest no increased uterine rupture risk, but repeat cesarean is a safe and established alternative |
| Maternal obesity | Technically more difficult; lower success rate and harder fetal palpation |
Additional Procedural Considerations
ECV carries an overall success rate of ~50-60%. Risks include:
- Placental abruption
- Fetal bradycardia
- Premature rupture of membranes
- Emergency need for delivery
For this reason, ECV should always be performed in a setting capable of immediate cesarean section, with an anesthesia provider available, regardless of whether neuraxial anesthesia is used for the procedure. Neuraxial anesthesia is associated with a higher success rate.
Factors predicting failure (not formal contraindications but relevant): engaged presenting part, difficulty palpating the fetal head, a tense uterus on palpation, anterior placenta, anterior or posterior fetal spine positioning, and cervical dilation. If all three asterisked factors are present simultaneously (engaged part + non-palpable head + tense uterus), no successful ECV has been reported.
Sources: Pfenninger and Fowler's Procedures for Primary Care, 3rd ed.; Miller's Anesthesia, 10th ed.; Creasy & Resnik's Maternal-Fetal Medicine
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