Phenylephrine Versus Norepinephrine for Maintenance of Hemodynamic During Cesarean Section Under Spinal Anesthesia

"Drug: Norepinephrine Norepinephrine tartrate variable infusion with a starting rate of 0,1μg/kg/min (equivalent to norepinephrine base of 0.05 μg /Kg/min).~Other name: Noradrenaline~Drug: Hyperbaric Bupivacaine will be injected in the subarachnoid space with a dose of 8 to 12 mg adjusted according to height~Drug: Sufentanil will be injected in the subarachnoid space with a dose of 2,5μg~Drug: Morphine will be injected in the subarachnoid space with a dose of 100 μg"

"Drug: Phenylephrine variable infusion with a starting rate of 0,5μg/kg/min~Drug: Hyperbaric Bupivacaine will be injected in the subarachnoid space with a dose of 8 to 12 mg adjusted according to height~Drug: Sufentanil will be injected in the subarachnoid space with a dose of 2,5μg~Drug: Morphine will be injected in the subarachnoid space with a dose of 100 μg"