Paradoxical bronchoconstriction caused by β₂-adrenoceptor agonists.

Area of Science:

• Pulmonology
• Pharmacology

Background:

• Salbutamol and terbutaline are common short-acting beta-2 adrenergic agonists used for obstructive pulmonary diseases.
• Paradoxical bronchoconstriction is a rare but serious adverse reaction to these bronchodilators.

Purpose of the Study:

• To report a case of paradoxical bronchoconstriction induced by beta-2 adrenergic agonists.

Main Methods:

• A 50-year-old asthmatic patient with a history of asthma attacks post-inhalation was studied.
• A 3-day double-blind crossover study compared salbutamol and terbutaline effects.
• Spirometry (FEV1, FVC, MEF25-75) was used to measure lung function.

Main Results:

• Terbutaline nebulization confirmed airway obstruction with a 40% decrease in FEV1.
• Ipratropium bromide did not cause significant changes in spirometric parameters.
• The patient received a warning regarding salbutamol and terbutaline use.

Conclusions:

• While generally safe, beta-2 adrenergic agonists can rarely cause paradoxical bronchoconstriction.
• Physicians should remain vigilant for this side effect and investigate potential cases.