Vasopressin can decrease splanchnic perfusion mainly through vasoconstriction in which vascular beds?

Vasopressin can decrease splanchnic perfusion mainly through vasoconstriction in which vascular beds?

• A. Cerebral vessels
• B. Pulmonary arteries
• C. Renal arteries
• D. Mesenteric vessels

Answer: (D)

Vasopressin reduces splanchnic perfusion primarily by inducing strong vasoconstriction in the mesenteric vessels, the arteries that feed the intestines. When vasopressin acts on V1 receptors in vascular smooth muscle, it causes intense constriction of these arterioles, diverting blood toward essential organs and away from the gut during shock or critical illness. While it can affect other vascular beds, the most pronounced impact on splanchnic flow comes from constriction of the mesenteric (gut) circulation. Cerebral vessels are typically guarded by autoregulation, and pulmonary or renal arteries are not the main contributors to this splanchnic drop in blood flow, though they can be affected to some degree in high-dose vasopressor use.

Vasopressin reduces splanchnic perfusion primarily by inducing strong vasoconstriction in the mesenteric vessels, the arteries that feed the intestines. When vasopressin acts on V1 receptors in vascular smooth muscle, it causes intense constriction of these arterioles, diverting blood toward essential organs and away from the gut during shock or critical illness. While it can affect other vascular beds, the most pronounced impact on splanchnic flow comes from constriction of the mesenteric (gut) circulation. Cerebral vessels are typically guarded by autoregulation, and pulmonary or renal arteries are not the main contributors to this splanchnic drop in blood flow, though they can be affected to some degree in high-dose vasopressor use.