In respiratory distress, CPAP may be considered particularly for which condition?

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

Answer: (B)

CPAP provides a steady positive airway pressure that keeps alveoli open throughout the breath, improving oxygenation and reducing the work of breathing. It shines in pulmonary edema because fluid-filled alveoli collapse and shunt blood away from well-ventilated areas, leading to severe hypoxemia. The positive pressure helps recruit flooded alveoli, increases the surface area for gas exchange, and improves ventilation-perfusion matching, often producing rapid oxygenation benefits. Additionally, the increased intrathoracic pressure can reduce venous return and left-sided filling pressures, which can help lessen the edema. Because of these effects, CPAP is particularly beneficial in pulmonary edema. In contrast, pneumothorax can be worsened by positive pressure, and asthma or COPD often require different ventilation strategies, so CPAP isn’t the standout choice for those conditions.