Which condition is most likely to require a fast-acting bronchodilator as rescue therapy?

• A. Chronic bronchitis
• B. Emphysema
• C. Asthma
• D. Pneumonia

Answer: (C)

The main idea here is that fast-acting bronchodilators are used as rescue therapy for conditions with reversible airway constriction that can cause sudden breathing difficulty. Asthma fits this pattern best because its episodes involve bronchospasm that rapidly narrows the airways but is typically reversible with a quick-relief inhaler. When a person with asthma experiences wheeze and shortness of breath, a short-acting bronchodilator (like albuterol) acts within minutes to relax the airway smooth muscle, widen the airways, and restore airflow.

Chronic bronchitis and emphysema (COPD) involve chronic obstruction, and while bronchodilators are part of management, the emphasis on a rapid, episodic rescue inhaler is less central than in asthma. Pneumonia is an infection of the lungs and does not primarily involve reversible bronchospasm requiring a fast-acting bronchodilator as rescue therapy.