Hartley 2001.

Study characteristics
Methods	RCT
Participants	40 women Inclusion criteria: ASA I or II undergoing elective CS Exclusion criteria: weight > 90 kg, height < 150 cm or > 175 cm, multiple pregnancy, diabetes or hypertension
Interventions	Lateral versus supine wedged Group 1: right‐lateral position adopted 2 min after spinal injection for 10 min, then turned to supine wedged (right hip) position Group 2: supine‐wedged (right hip) position adopted 1 min after spinal injection and maintained throughout Intervention occurred after spinal injection. All women received a standardised crystalloid preload and anaesthetic technique and dose. Bradycardia was managed with atropine. Hypotension was managed with ephedrine.
Outcomes	Maternal: hypotension; heart rate; block height; time to maximum block; time to birth; duration of hypotension; nausea/dizziness; ephedrine requirements
Notes	Hypotension was defined as SBP < 80% baseline
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomisation and allocation concealment: sealed envelope
Allocation concealment (selection bias)	Unclear risk	Sealed envelope
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not reported
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not reported
Incomplete outcome data (attrition bias) All outcomes	Low risk	Losses to follow‐up: not stated
Selective reporting (reporting bias)	Low risk	None apparent
Other bias	Low risk	None apparent