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- W2085206894 abstract "We studied peripheral and central hemodynamics and plasma catecholamine levels in 12 previously untreated patients with essential hypertension before and during treatment with the alpha 1-adrenoceptor antagonist prazosin (9.8 +/- 1.1 mg/day for 3-6 weeks following dose titration) as a single drug. Prazosin did not alter intra-arterially recorded blood pressures in the group as a whole, in spite of adequate plasma levels (12.6 +/- 1.2 ng/ml). There were no changes in cardiac output, blood volume, systemic or forearm vascular resistance, or forearm venous tone at rest during treatment. The blood pressure response to prazosin was correlated to pretreatment systemic and forearm vascular resistances. Arterial adrenaline levels were unchanged, but noradrenaline levels increased from 1.30 +/- 0.10 to 1.85 +/- 0.20 nM (p less than 0.05). Both noradrenaline and blood pressure responses to isometric hand-grip exercise were delayed and reduced during treatment. The hemodynamic and plasma catecholamine responses to a cold pressor test and tilting (50% head-up during 10 min) were similar before and during treatment. Our results may be related to development of tolerance to the alpha-adrenoceptor blocking effect of prazosin during long-term treatment. The elevation of arterial noradrenaline levels suggests that increased sympathetic activity also may have opposed the hypotensive response to prazosin." @default.
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- W2085206894 date "1983-05-01" @default.
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- W2085206894 title "Effects of Prazosin on Hemodynamics and Sympatho-Adrenal Activity in Hypertensive Patients" @default.
- W2085206894 doi "https://doi.org/10.1097/00005344-198305000-00007" @default.
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