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Related Experiment Videos

Beta-blockers and asthma.

P B Decalmer, S S Chatterjee, J M Cruickshank

    British Heart Journal
    |February 1, 1978
    PubMed
    Summary
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    Cardioselective beta-blockers, particularly atenolol, showed minimal impact on lung function (FEV1) in asthmatic patients. Non-cardioselective beta-blockers significantly reduced FEV1 and blocked bronchodilator responses.

    Area of Science:

    • Pharmacology
    • Respiratory Medicine
    • Cardiology

    Background:

    • Beta-blockers are widely used for cardiovascular conditions.
    • Asthma patients may require cardiovascular medications.
    • The impact of different beta-blocker classes on respiratory function is a critical consideration.

    Purpose of the Study:

    • To compare the effects of oral cardioselective and non-cardioselective beta-blockers on FEV1 in asthmatic patients.
    • To assess the impact of these agents on heart rate and bronchodilator response to isoprenaline.

    Main Methods:

    • Single-blind, randomized, crossover study involving 10 asthma patients.
    • Administration of equipotent oral doses of three cardioselective (atenolol, metoprolol, acebutolol) and four non-cardioselective beta-blockers (propranolol, oxprenolol, pindolol, timolol).

    Related Experiment Videos

  • Measurement of FEV1, standing pulse rate, and heart rate response to inhaled isoprenaline.

    • Main Results:

    • All tested beta-blockers, except pindolol, reduced standing pulse rate.
    • All beta-blockers caused a decrease in FEV1, with atenolol showing no significant difference from placebo.
    • Non-cardioselective beta-blockers blocked the bronchodilator response to isoprenaline, while cardioselective agents allowed some bronchodilation.

    Conclusions:

    • Cardioselective beta-blockers, especially atenolol, appear safer for asthmatic patients regarding FEV1.
    • Non-cardioselective beta-blockers significantly impair lung function and the response to bronchodilators in asthma.
    • Clinical use of beta-blockers in asthma patients necessitates careful selection based on cardioselectivity.