Attenuation of nitrate effect during an intermittent treatment regimen and the time course of nitrate tolerance.

Abstract:

:The long-term efficacy of transdermal nitrate therapy, in particular the ability of a single patch to provide 24 h prophylaxis against angina, has been questioned. Two mechanisms have been suggested for this loss of effect: the development of pharmacological tolerance, and premature patch exhaustion. This study was designed to investigate this problem, and in particular to investigate the time course of treatment failure. It comprised a randomized, double-blind, cross-over comparison of transdermal glyceryl trinitrate and matching placebo transdermal patches. Significant treatment effects were demonstrated by several criteria for 8 h of continuous therapy, with some limited effect persisting for 15 h. Loss of effect began to develop very soon after treatment was initiated and progressed in a steady, linear fashion so that there was virtually no treatment effect after 24 h. In contrast, during intermittent therapy, treatment effects were maintained on the second day following a nitrate-free interval. Significant benefit was demonstrated for up to 32 h (i.e. 8 h of treatment on day 2). Both nitrate-free intervals (12 and 16 h) seemed to be equally effective in maintaining efficacy after 3 h of treatment on the second day, although this was still somewhat attenuated compared with day 1. These results confirm that loss of therapeutic efficacy of transdermal nitrate is due to the development of tolerance and not premature patch exhaustion. In contrast to previous studies, however, they suggest that tolerance can only partly be reversed by intermittent therapy and also that the onset of tolerance is so rapid that it is well established in less than a day's treatment.

journal_name

Eur Heart J

journal_title

European heart journal

authors

James MA,Papouchado M,Jones JV

doi

10.1093/eurheartj/12.12.1266

subject

Has Abstract

pub_date

1991-12-01 00:00:00

pages

1266-72

issue

12

eissn

0195-668X

issn

1522-9645

journal_volume

12

pub_type

临床试验,杂志文章,随机对照试验
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    pub_type: 杂志文章,随机对照试验

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