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Related Experiment Videos

Nitrate tolerance.

J C Cowan

    International Journal of Cardiology
    |July 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Nitrate tolerance in angina prophylaxis is controversial. Rapid development and reversal of tolerance suggest intermittent nitrate use, with a daily nitrate-free interval, may optimize antianginal effects and minimize tolerance.

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    Area of Science:

    • Pharmacology
    • Cardiology
    • Clinical Medicine

    Background:

    • Nitrates are a cornerstone therapy for angina prophylaxis, yet the phenomenon of nitrate tolerance remains a subject of debate.
    • While tolerance to arterial pressure effects is generally accepted, its occurrence regarding venous, pulmonary, and antianginal effects is disputed.
    • Conflicting study results highlight the need to understand factors influencing nitrate tolerance, including the speed of onset and reversal.

    Purpose of the Study:

    • To review the current understanding of nitrate tolerance in the context of anginal prophylaxis.
    • To discuss factors contributing to conflicting findings in previous studies on nitrate tolerance.
    • To explore the clinical implications of recent findings on nitrate tolerance for patient management.

    Main Methods:

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    • Review of existing literature and recent research findings on nitrate tolerance.
    • Analysis of factors influencing the development and reversal of tolerance, including plasma nitrate levels and treatment intervals.
    • Discussion of the impact of these findings on current clinical practice guidelines for nitrate use.

    Main Results:

    • Nitrate tolerance develops rapidly upon treatment initiation and resolves quickly after discontinuation.
    • Tolerance is strongly associated with plasma nitrate profiles; constant levels promote tolerance, while fluctuating levels minimize it.
    • A daily nitrate-free interval appears to be a protective strategy against the development of nitrate tolerance.

    Conclusions:

    • Continuous nitrate prophylaxis should be avoided if possible; intermittent dosing strategies are recommended.
    • Tailoring nitrate administration to individual needs, ensuring protection during peak susceptibility while allowing for nitrate-free periods, is suggested.
    • Further research is required to validate the efficacy of nitrate-free intervals for antianginal protection and to rule out withdrawal effects.