Effect of tilt of womb of mother on requirement of medicine to prevent fall in blood pressure during caesarean section

INTERVENTION: Intervention1: Supine with no wedge: Patients will be placed supine without any wedge. Spinal anaesthesia will be given. A prophylactic infusion of norepinephrine will be started immediately after spinal injection and then titrated according to systolic blood pressure. Control Intervention1: Wedge: Patients will be placed supine with a wedge under right buttock. Spinal anaesthesia will be given. A prophylactic infusion of norepinephrine will be started immediately after spinal injection and then titrated according to systolic blood pressure. CONDITION: Health Condition 1: O82‐ Encounter for cesarean delivery without indication Health Condition 2: 1‐ Obstetrics PRIMARY OUTCOME: Norepinephrine requirementsTimepoint: Till time of delivery SECONDARY OUTCOME: 1. Incidence of hypotension, hypertension, bradycardia, tachycardia ; 2. Umbilical artery and venous blood gases ; 3. Apgar scores at 1 and 5 minutes ; 4. Incidence of nausea, vomiting, dizziness or any other maternal complications ; Timepoint: Till time of delivery INCLUSION CRITERIA: Healthy mothers with term, uncomplicated, singleton pregnancy scheduled to undergo elective caesarean section under subarachnoid block