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Related Experiment Videos

Tolerance to inhaled fenoterol.

E Angelici, M Delfino, S Carlone

    The American Review of Respiratory Disease
    |June 1, 1984
    PubMed
    Summary

    This study found no tolerance to inhaled fenoterol in 15 asthmatics over 3 months. Consistent bronchodilator response indicates long-term effectiveness when using fenoterol for asthma.

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    Area of Science:

    • Pharmacology
    • Respiratory Medicine
    • Clinical Trials

    Background:

    • Fenoterol is a widely used bronchodilator for asthma.
    • Conflicting reports exist regarding the development of tolerance to beta-adrenergic agonists like fenoterol.
    • Previous studies on fenoterol tolerance may have been limited by variations in study design.

    Purpose of the Study:

    • To investigate the development of tolerance to inhaled fenoterol in asthmatic patients.
    • To assess the long-term efficacy of fenoterol therapy under controlled conditions.
    • To resolve conflicting findings on fenoterol tolerance in asthma management.

    Main Methods:

    • A 3-month, rigidly controlled study involving 15 asthmatic patients.
    • Inhaled fenoterol was administered to participants.
    • Serial physiologic measurements were conducted at regular intervals throughout the 90-day study period.

    Main Results:

    • A significant, prompt, and sustained bronchodilator response was observed on day 1.
    • Physiologic measurements at 1, 3, 4, 8, and 12 weeks showed statistically consistent responses compared to day 1.
    • No evidence of diminished bronchodilator effect was detected over the 3-month treatment period.

    Conclusions:

    • When critical variables are meticulously controlled, long-term fenoterol therapy does not demonstrate tolerance.
    • Inhaled fenoterol maintains its bronchodilator efficacy in asthmatics over a 3-month period.
    • This study provides evidence against tolerance development to fenoterol under optimal study conditions.

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