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Related Experiment Videos

Nifedipine does not alter methacholine-induced bronchial reactivity.

J I Matthews, H M Richey, F W Ewald

    Annals of Allergy
    |December 1, 1984
    PubMed
    Summary

    Nifedipine, a calcium channel blocker, did not change bronchial reactivity in patients with asthma. While lung function remained similar, patients reported fewer symptoms after nifedipine administration.

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    Area of Science:

    • Pulmonary Medicine
    • Pharmacology

    Background:

    • Calcium ions play a role in smooth muscle contraction and secretion.
    • Nifedipine is a calcium channel blocker with no intrinsic bronchodilatory effect.
    • Nifedipine's potential to inhibit bronchial reactivity has been investigated.

    Purpose of the Study:

    • To evaluate the effect of nifedipine on methacholine-induced bronchial reactivity in patients with normal pulmonary function.
    • To assess whether nifedipine alters the objective measures of bronchial reactivity or subjective patient symptoms.

    Main Methods:

    • Eight patients with existing bronchial reactivity underwent two methacholine challenges.
    • Pulmonary function tests (spirometry) and airway resistance measurements were performed before and after nifedipine administration.
    • Patients received escalating doses of methacholine after saline inhalation.

    Main Results:

    • Nifedipine did not significantly alter baseline spirometry, lung function at any methacholine level, or airway resistance.
    • Reductions in FEV1, FVC, MMEF, and PEFR were comparable between the initial and post-nifedipine challenges.
    • Despite similar objective lung function changes, patients reported reduced symptoms after nifedipine.

    Conclusions:

    • Nifedipine does not modify methacholine-induced bronchial hyperresponsiveness.
    • Nifedipine may alter symptom perception in asthmatic patients.
    • Caution is advised when prescribing nifedipine to asthmatic patients with heart disease due to potential altered symptom perception.

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