What oxygenation intervention is indicated for stroke patients with low oxygen saturation?

• A. Intubate immediately
• B. Give O2 if less than 94%
• C. No supplemental oxygen
• D. Hyperventilate

Answer: (B)

Maintaining adequate brain oxygen delivery is crucial in acute stroke to limit the extent of ischemic injury. If the oxygen saturation is below 94%, the appropriate action is to provide supplemental oxygen to bring SpO2 into a safe range, typically above 94%. This can be done with a nasal cannula or face mask, and you should monitor the saturation and adjust flow to reach the target.

Intubation is not the default for low oxygen saturation in this setting; it’s reserved for situations where the airway cannot be protected, ventilation is inadequate, or oxygenation cannot be achieved with noninvasive means. Not giving oxygen when SpO2 is low would allow hypoxemia to worsen brain injury. Hyperventilation isn’t used to improve oxygenation in stroke; it lowers CO2, causing cerebral vasoconstriction and potentially reducing cerebral blood flow, and is only used in specific scenarios like acute intracranial hypertension, not as a blanket treatment for hypoxemia.