Sullivan 2009.

Methods	RCT.
Participants	Inclusion criteria: singleton breech presentations after 36 weeks' gestation. N = 95. Exclusion criteria: patients with contraindications to neuraxial anaesthesia, allergies to study medications.
Interventions	Intervention:systemic opioids (E) + tocolytic. Systemic opioids (50 µg fentanyl). N = 47. Comparison:regional analgesia (C) + tocolytic. CSE anaesthesia (bupivacaine 2.5 mg and 15 µg fentanyl followed by 45 mg lidocaine and 15 µg epinephrine). N = 48. Both groups received terbutaline.
Outcomes	Successful ECV, hypotension, decelerations of FHR, persistent decelerations, CS.
Notes	1 woman excluded after randomisation before ECV because of non‐reassuring CTG.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer random‐number table.
Allocation concealment (selection bias)	Low risk	Sequentially numbered opaque envelopes.
Blinding of participants and personnel (performance bias) All outcomes	High risk	No blinding.
Blinding of outcome assessment (detection bias) All outcomes	High risk	No blinding.
Incomplete outcome data (attrition bias) All outcomes	Low risk	1 woman was excluded after randomisation because she underwent an emergency CS. Other possible exclusions are unclear.
Selective reporting (reporting bias)	Unclear risk	We did not assess the trial protocol.
Other bias	Low risk	No significant differences between the 2 groups in age, parity, GA, height, weight or obstetrician predicted difficulty of version. Other biases not identified.