Phenylephrine Vs. Norepinephrine on the Renin–Angiotensin–Aldosterone System and Postoperative Complications in Acute Abdomen Emergency Surgery: A Randomized Controlled Trial

PE and NE exert similar effects on RAAS components and postoperative complications. A higher plasma renin level before surgery is associated with greater vasopressor requirement and a higher incidence of postoperative complications.