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- W2018204657 abstract "The rationale for intermittent nitrate therapy is based on the pathophysiology of nitroglycerin tolerance and the diurnal pattern of symptoms encountered in patients with chronic stable angina. Nitrate tolerance was first observed as tolerance to headache in industrial toxicology. When long-acting nitrates for chronic stable angina became available, similar tolerance was observed but not thought to indicate tolerance to a haemodynamic or therapeutic effect. Subsequently, Needleman and coworkers (J Pharmacol Exp Ther 1973; 187: 324) defined in vitro the phenomenology of vascular smooth muscle tolerance to nitroglycerin-induced relaxation and reversibility was demonstrated. More recently, a potential molecular explanation for nitrate tolerance has been proposed: sulfhydryl group depletion in smooth muscle cells resulting in reduced formation of S-nitrosothiols on nitrate exposure with resultant reduced activation of cyclic GMP. In vivo, other mechanisms, including fluid retention and neurohumoral responses to vasodilation may also be important. The first demonstration that nitrate tolerance affected the therapeutic efficacy of long-acting nitrates was reported by Parker and coworkers in 1982 (Circulation 1987; 76: 572-6). This landmark study was not given much credence at the time because it appeared to be in conflict with earlier reports. However, in the past 6 years development of tolerance has been demonstrated with a variety of oral nitrates, transdermal nitroglycerin and intravenous nitroglycerin. When plasma concentrations are held constant, tolerance to antianginal effects is demonstrable within 24h, but varies markedly in severity from individual to individual.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2018204657 title "Intermittent nitrate therapy in angina pectoris" @default.
- W2018204657 doi "https://doi.org/10.1093/eurheartj/10.suppl_a.7" @default.
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