Huang 1992.

Study characteristics
Methods	RCT
Participants	Inclusion criteria: Primiparous women 20‐38 years, undergoing emergency CS, with regional anaesthesia, with normal heart, lung, blood, urine examination and with no history of drug allergy, pre‐eclampsia, supine low BP syndrome. N = 100 Exclusion criteria:
Interventions	Intervention: dopamine antagonist (Comparson 2) Metoclopramide 20 mg during CS. N = 50. Comparison: no treatment No intervention. N = 50.
Outcomes	Nausea, hypotension, bradycardia.
Notes	Setting: study location (hospital, city, country) not described. Dates: not reported. Funding source: not reported. Declaration of interest: not reported.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not described.
Allocation concealment (selection bias)	Unclear risk	Not described.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No blinding of participants described.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No blinding of outcome assessor described.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	None described.
Selective reporting (reporting bias)	Unclear risk	We did not assess the trial protocol.
Other bias	Unclear risk	None described.