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Related Experiment Videos

Severe asthma: prevention is better than cure.

R S Goldstein, A S Slutsky, A S Rebuck

    Drugs
    |September 1, 1978
    PubMed
    Summary

    Even without symptoms, asthma patients often have lung function abnormalities. Regular use of inhaled sympathomimetics and oral theophylline can prevent exacerbations and improve quality of life.

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    Area of Science:

    • Pulmonology
    • Respiratory Medicine
    • Clinical Medicine

    Background:

    • Asthmatic patients frequently exhibit lung mechanics and gas exchange abnormalities during symptom-free periods.
    • Thickened mucosa and tenacious secretions contribute to ventilation-perfusion mismatch and small airway obstruction in asthma.
    • Maximal expiratory flow-volume loops reveal reduced flow rates at low lung volumes and widened alveolar-arterial oxygen difference.

    Purpose of the Study:

    • To investigate the persistent abnormalities in lung function in asymptomatic asthma patients.
    • To evaluate the efficacy of preventive treatments in addressing these underlying physiological changes.
    • To determine the benefits of regular inhaled sympathomimetics and oral theophylline in susceptible asthma patients.

    Main Methods:

    • Assessment of lung mechanics and gas exchange during symptom-free intervals.
    • Analysis of maximal expiratory flow-volume loops to identify flow limitations.
    • Clinical evaluation of patients susceptible to acute exacerbations receiving regular preventive therapy.

    Main Results:

    • Persistent abnormalities in lung mechanics and gas exchange are common in symptom-free asthma.
    • Impaired expiratory flow rates at low lung volumes and widened alveolar-arterial O2 difference are characteristic findings.
    • Regular use of inhaled sympathomimetics and oral theophylline is associated with improved well-being, exercise tolerance, and reduced exacerbation frequency and severity.

    Conclusions:

    • Preventive treatment targeting lung mechanics and gas exchange abnormalities is crucial for asthma management.
    • Regular inhaled sympathomimetics and oral theophylline are justified for symptom-free asthma patients prone to exacerbations.
    • These therapies can significantly improve patient outcomes, including reduced symptom burden and enhanced quality of life.

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