In congestive heart failure with pulmonary edema, what is the role of oxygen therapy?

• A. Administer 100% oxygen indefinitely.
• B. Withhold oxygen to avoid toxicity.
• C. Provide adequate oxygenation; consider CPAP/NIV to improve oxygenation and reduce work of breathing; escalation if needed.
• D. Only use diuretics to treat edema.

Answer: (C)

In congestive heart failure with pulmonary edema, the goal of oxygen therapy is to raise the blood’s oxygen content and ease the patient’s breathing. Give enough supplemental oxygen to achieve adequate oxygenation, avoiding both dangerous hypoxemia and unnecessary exposure to very high FiO2. When there is significant shortness of breath or persistent hypoxemia, using noninvasive positive-pressure ventilation (CPAP or BiPAP) can greatly help by keeping alveoli open, improving gas exchange, and reducing the work of breathing. This approach can also help lower preload and afterload, which can reduce pulmonary edema and improve comfort. If oxygenation remains poor despite noninvasive support, escalate to invasive ventilation with careful monitoring.

Giving 100% oxygen indefinitely is not appropriate because it doesn’t specifically treat the edema or the underlying gas exchange problem and can lead to oxygen toxicity over time. Withholding oxygen to avoid toxicity leaves a hypoxemic patient untreated. Relying only on diuretics addresses fluid excess but does not correct oxygenation, so it cannot replace the need for appropriate oxygen therapy.