Abreu‐Gonzalez 2002.

Methods	Randomised, controlled, double blind study, 2 groups. 1 centre in Tenerife.
Participants	24 patients (Intervention 13, Control 11), adults, acute asthma, moderate obstruction.
Interventions	Intervention: 2 mL of MgSO₄ (isotonic) dose and 400 mcg of salbutamol (delivery probably by MDI). Control: 2 mL of a physiological serum of an inhaled form, 400 mcg of salbutamol (delivery probably by MDI). Nebuliser: no details.
Outcomes	FEV1 and PEF at 0, 15, 30 45 minutes.
Notes	Funding: Gobierno Autonomo Canarias. Abstract only.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No details but stated as "randomised".
Allocation concealment (selection bias)	Unclear risk	No details.
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Double blind.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Double blind.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No details.
Selective reporting (reporting bias)	Unclear risk	Abstract only and not all time points reported.