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- W2078120410 abstract "Arginine vasopressin (AVP) causes biphasic changes in vascular resistance in human forearms: vasoconstriction at lower doses and vasodilation at higher doses. Vasoconstriction is mediated by the V1 receptor, but the mechanism of AVP-induced vasodilation remains unclear. To determine if the AVP-induced vasodilation in human forearm vessels is mediated by the V2 receptor, we examined the effects of OPC-31260 (a novel vasopressin V2 receptor antagonist) on AVP-induced vasodilation. The brachial artery was cannulated for drug infusions and direct measurement of arterial blood pressure (BP). We measured forearm blood flow (FBF) by a strain-gauge plethysmograph and calculated forearm vascular resistance (FVR). AVP was infused intraarterially (i.a.) at doses of 0.1, 0.2, 0.5, 1.0, and 2.0 ng/kg/min (n = 8). The lower dose of AVP (0.1 ng/kg/min) increased, whereas the higher doses of AVP (> or = 0.5 ng/kg/min) decreased, FVR (p < 0.01). Infusion of nitroglycerin (NTG) i.v. doses of 1.7, 3.3, and 10.0 ng/kg/min decreased FVR dose dependently (p < 0.01). OPC-31260 (1.0 micrograms/kg/min) infused i.a. did not alter arterial BP, baseline FVR, or heart rate (HR). OPC-31260 did not affect AVP-induced vasoconstriction but blocked AVP-induced vasodilation completely. OPC-31260 did not affect NTG-induced vasodilation. These results suggest that AVP-induced vasodilation is mediated by the V2 receptor in human forearm resistance vessels." @default.
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- W2078120410 date "1995-03-01" @default.
- W2078120410 modified "2023-10-18" @default.
- W2078120410 title "V2 Receptor-Mediated Vasodilation in Healthy Humans" @default.
- W2078120410 doi "https://doi.org/10.1097/00005344-199503000-00006" @default.
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