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Bronchodilating effect of terbutaline aerosol
Clinical Pharmacology and Therapeutics
|June 1, 1978
Summary
Terbutaline, metaproterenol, and isoproterenol equally improved airflow in asthmatic patients. Terbutaline demonstrated superior small airway effects at 5 hours without impacting heart rate or blood pressure.
Area of Science:
- Pulmonary Medicine
- Pharmacology
Background:
- Asthma management relies on bronchodilators.
- Evaluating the comparative efficacy of different beta-2 adrenergic agonists is crucial.
Purpose of the Study:
- To compare the efficacy of terbutaline aerosol with metaproterenol, isoproterenol, and placebo in asthmatic patients.
- To assess the duration of action and effects on small airways.
Main Methods:
- A randomized controlled trial involving 16 asthmatic patients.
- Administration of terbutaline, metaproterenol, isoproterenol, and placebo aerosols.
- Measurement of airflow rates and small airway function (FEF25%–75%, FEF50%) over time.
- Monitoring of heart rate and blood pressure.
Main Results:
- Terbutaline, metaproterenol, and isoproterenol showed comparable initial improvements in airflow.
- Terbutaline exhibited significantly greater effects on small airway function (FEF25%–75%, FEF50%) at 5 hours compared to metaproterenol and isoproterenol (p < 0.05).
- Terbutaline did not cause significant changes in heart rate or blood pressure.
Conclusions:
- Terbutaline offers comparable bronchodilator effects to metaproterenol and isoproterenol.
- Terbutaline provides a potentially longer-lasting effect on small airway function in asthma.
- Terbutaline demonstrates a favorable safety profile regarding cardiovascular effects.