Magnesium sulfate in women with mild preeclampsia: a randomized controlled trial.

Objective: To determine whether magnesium sulfate prevents disease progression in women with mild preeclampsia.

Methods: A total of 222 women with mild preeclampsia were randomized to receive intravenous magnesium sulfate (n = 109) or matched placebo (n = 113). Mild preeclampsia was defined as blood pressure of at least 140/90 mm Hg taken on two occasions in the presence of new-onset proteinuria.