Why does aspirin worsen asthma in certain patients?

Aspirin can precipitate severe bronchospasm in susceptible individuals, particularly those with aspirin-exacerbated respiratory disease (AERD). This reaction is not an IgE-mediated allergy but rather a pharmacologic consequence of cyclooxygenase-1 (COX-1) inhibition.

Mechanism

Under normal conditions, arachidonic acid is metabolized by both the cyclooxygenase pathway and the lipoxygenase pathway. When aspirin irreversibly inhibits COX-1, prostaglandin synthesis decreases. As a result, more arachidonic acid is diverted toward the 5-lipoxygenase pathway, leading to excessive production of cysteinyl leukotrienes.

These leukotrienes are potent mediators of airway inflammation and cause:

Bronchoconstriction
Airway edema
Increased mucus secretion
Eosinophilic inflammation

The result is acute worsening of respiratory symptoms shortly after exposure.

Clinical Features

Patients often present with:

Wheezing
Chest tightness
Persistent cough
Rhinorrhea
Nasal congestion
Dyspnea
Facial flushing
Severe bronchospasm in advanced cases

Symptoms typically develop within 30 minutes to 3 hours after ingestion.

Who is at risk?

The condition is particularly associated with:

Chronic asthma
Chronic rhinosinusitis
Recurrent nasal polyps
Adult-onset asthma
Eosinophilic airway disease

The classic triad consists of asthma, nasal polyps, and aspirin sensitivity.

Diagnosis

Diagnosis is usually clinical.

Important clues include:

Multiple episodes after NSAID exposure
Nasal polyps
Chronic sinus disease
Improvement after avoiding COX-1 inhibitors

Formal aspirin challenge testing may be performed in specialized centers when necessary.

Management

Treatment includes:

Immediate bronchodilator therapy
Systemic corticosteroids when indicated
Avoidance of COX-1 inhibiting NSAIDs
Leukotriene receptor antagonists in selected patients
Aspirin desensitization in carefully selected cases

Clinical Pearl

Patients frequently report that “every painkiller makes my asthma worse.” Careful questioning often reveals that acetaminophen at low doses is tolerated while classic NSAIDs consistently trigger symptoms.

Additional Notes

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum feugiat, neque vitae tincidunt faucibus, turpis arcu commodo risus, sed dignissim justo metus quis nulla.

Socials