Newsletter Pathophysiology of Asthma Asthma is usually defined clinically as reversible airflow limitation, but current definitions also recognise the presence of airway hyper-responsiveness to bronchoconstricting stimuli such as histamine, and eosinophilic airway inflammation. Asthma may be triggered by occupational exposure, drugs (including aspirin: around 1%). Asthma attacks or exacerbations may be triggered by viral infections, […]