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Hypertension is a common complication of pregnancy.
Whenever possible, missing data were obtained by personal communication with authors. Discrepancies were resolved by discussion. There are insufficient data for any conclusions about the effect on perinatal mortality or preterm delivery. Maternal hospital admission may be decreased, neonatal bradycardia increased and respiratory distress syndrome decreased, but these outcomes are only reported in a very small proportion of trials. Single small trials have compared beta-blockers with hydralazine and with nicardipine.