Wheezing is most commonly associated with which pathophysiology?

• A. Narrowed airways due to bronchospasm or edema
• B. Fluid in the alveoli
• C. Collapsed lung
• D. Pleural effusion

Answer: (A)

Wheezing reflects airway narrowing that forces air to move through constricted bronchioles, creating a high-pitched, musical sound from turbulent flow. This narrowing comes from bronchial smooth muscle constriction (bronchospasm) and swelling of the airway lining with mucus (edema and secretions). That’s why wheezing is commonly heard in asthma and other conditions with bronchial hyperreactivity.

Fluid in the alveoli produces crackles (not a wheeze) as fluid shimmers in the small airways and air sacs. A collapsed lung tends to reduce or absent breath sounds on the affected side and may cause chest signs like hyperresonance or asymmetry, not a wheeze. Pleural effusion muffles sounds and often presents with dull percussion and diminished breath sounds rather than a wheezing noise.