Manually Controlled, Continuous Infusion of Phenylephrine or Norepinephrine for Maintenance of Blood Pressure and Cardiac Output During Spinal Anesthesia for Cesarean Delivery: A Double-Blinded Randomized Study

Abstract

(Anesth Analg. 2023;136:540–550) Spinal anesthesia (SA) can induce maternal hypotension which may compromise uteroplacental and fetal perfusion. Current practices that counteract SA-induced vasodilation employ a phenylephrine or norepinephrine infusion through computer-controlled, fixed-rate, and manual delivery methods. The current study investigated the hemodynamic effects of continuous infusion of norepinephrine compared with phenylephrine in maintaining cardiac index (CI) during cesarean delivery (CD) under SA.