Incidence of hypotension is high in parturients after spinal anesthesia. Ephedrine could be used to treat hypotension but lead to lower fetal pH as well. This study is to compare the effects of norepinephrine and ephedrine on hypotension in parturients.
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incidence of hypotension
Timeframe: from immediately after spinal anesthesia to 30min after spinal anesthesia