What should be done if the patient is hypoxemic in pulmonary edema?

• A. Oxygen
• B. Hyperbaric oxygen
• C. Oxygen plus intubation immediately
• D. No oxygen

Answer: (A)

In pulmonary edema the immediate problem is low blood oxygen from fluid-filled alveoli causing poor gas exchange. The first and most important step to correct this hypoxemia is to give supplemental oxygen. By increasing the fraction of inspired oxygen, you raise the alveolar PO2 and improve arterial oxygen content, helping tissues receive more oxygen right away.

If oxygen alone does not keep oxygenation adequate due to ongoing edema and increased work of breathing, you can escalate to noninvasive ventilation (CPAP or BiPAP) to recruit more alveoli and reduce the breathing effort. Only if the patient cannot maintain oxygenation or airway protection with noninvasive methods should endotracheal intubation and mechanical ventilation be considered.

Hyperbaric oxygen isn’t indicated here because it doesn’t address the principal gas-exchange issue in pulmonary edema. Giving no oxygen would obviously worsen hypoxemia.