Which of the following is NOT a cause of postoperative hypotension due to vasodilation?

In the context of postoperative hypotension due to vasodilation, it is essential to understand the mechanisms involved. The infusion of norepinephrine or epinephrine, as mentioned in the selected answer, is primarily used as a vasoconstrictor to increase blood pressure. These catecholamines work by stimulating alpha-adrenergic receptors, leading to the constriction of blood vessels and thus increasing systemic vascular resistance. Therefore, the administration of norepinephrine or epinephrine would typically counteract hypotension rather than cause it.

In contrast, the other options relate to scenarios that can promote vasodilation leading to hypotension. Rewarming after hypothermia can induce vasodilation as peripheral blood vessels dilate to increase blood flow to the skin and help radiate heat; this can lead to decreased systemic vascular resistance. Similarly, the inflammatory response or sepsis can lead to widespread vasodilation due to the release of inflammatory mediators, contributing to hypotension. Lastly, the infusion of nitroglycerin or nitroprusside provides vasodilation, which is intended to lower blood pressure but can result in postoperative hypotension if not carefully managed.

Overall, it is crucial to recognize that while some agents and conditions can cause vas