This is a randomized, double-blinded controlled study that aims to estimate the effect of maternal body mass index on the prophylactic dose of norepinephrine infusion for preventing hypotension in parturient after spinal anesthesia.
A normal singleton pregnancy with a gestational age of ≥ 37 weeks. 18-40 years old pregnant women scheduled for elective C/S under spinal anesthesia.
Any absolute contraindication to spinal block, Neurological or cardiac disorder, Basal systolic blood pressure above 140 mmHg or below 100 mmHg, Peripartum bleeding or emergent situations both for fetus and mother, Those who refused to participate in the study were excluded Known fetal abnormality, intrauterine growth restriction, Obstetric complication (ruptured membranes, placenta previa, placental abruption),
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Treatment groupsSee each treatment group below.