Shortness of breath with high-pitched expiratory wheezing is most characteristic of which respiratory condition?

• A. COPD
• B. Pneumonia
• C. Asthma
• D. Pulmonary edema

Answer: (C)

Shortness of breath with a high-pitched expiratory wheeze indicates asthma. This pattern happens because asthma causes reversible narrowing of the small airways due to bronchospasm and inflammation. As air tries to move through the constricted passages, especially during expiration, it creates a high-pitched wheeze. The expiratory wheeze reflects increased airway resistance and is a hallmark of an acute asthma episode, often improving with bronchodilators and anti-inflammatory treatments. Other conditions can cause dyspnea or wheezing for different reasons (pneumonia typically brings fever and crackles; COPD is a chronic, long-standing dyspnea with cough; pulmonary edema involves crackles and fluid overload), but the combination described is most characteristic of asthma.