Study designs of evaluations included in the review
Randomised controlled trials (RCTs), non-randomised controlled trials of "historical interest", "classic" observational studies and recent retrospective studies.
Specific interventions included in the review
Magnesium sulphate therapy. Control therapies included phenytoin, diazepam, lytic cocktail, dihydralazine, methyl dopa, nifedipine, nimodipine, labetalol and placebo
Participants included in the review
Women with pre-eclampsia or eclampsia and hypertensive disorders of pregnancy.
Outcomes assessed in the review
Incidence of seizures or recurrent seizures.
How were decisions on the relevance of primary studies made?
The authors do not state how the papers were selected for the review, or how many of the reviewers performed the selection.