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Anti-cyclo-oxygenase agents and asthma.
Summary
Aspirin and similar drugs can trigger asthma attacks in sensitive individuals by inhibiting cyclo-oxygenase. Patients should avoid these medications, though rare cases of bronchodilation exist.
Area of Science:
- Pharmacology
- Pulmonology
- Immunology
Background:
- Aspirin irreversibly inhibits cyclo-oxygenase (COX), a mechanism linked to asthma exacerbations.
- Approximately 5%-10% of adult asthmatics experience adverse reactions to aspirin.
- Other COX inhibitors also induce bronchoconstriction in sensitive individuals.
Purpose of the Study:
- To elucidate the mechanism by which aspirin and related drugs precipitate asthmatic attacks.
- To differentiate the effects of COX inhibitors from non-COX inhibiting NSAIDs in asthmatic patients.
- To review the spectrum of patient responses to aspirin, including rare bronchodilation.
Main Methods:
- Review of existing literature on aspirin's mechanism of action.
- Analysis of clinical reports detailing drug-induced asthma.
- Comparison of cyclo-oxygenase inhibitors versus non-cyclo-oxygenase inhibiting drugs in asthmatic populations.
Main Results:
- Aspirin's irreversible time-dependent inhibition of cyclo-oxygenase is identified as the primary cause of bronchoconstriction in aspirin-sensitive asthmatics.
- Nonsteroidal anti-inflammatory drugs lacking cyclo-oxygenase activity do not typically cause adverse respiratory effects.
- Rare instances of bronchodilation following aspirin ingestion have been documented.
Conclusions:
- Aspirin-sensitive asthmatic patients must exercise caution and avoid aspirin and other cyclo-oxygenase inhibitors.
- The cyclo-oxygenase pathway is critical in mediating aspirin-induced asthma.
- Further research may explore the rare bronchodilatory effects for potential therapeutic insights.