What is the initial EMS treatment for a patient with suspected carbon monoxide poisoning during transport?

• A. Provide 100% oxygen, monitor vitals, rapid transport to the ED; consider hyperbaric oxygen therapy if criteria are met.
• B. Delay oxygen administration until arrival at the ED to avoid oxygen toxicity.
• C. Administer aspirin and monitor without giving oxygen.
• D. Ventilate with room air and postpone transport.

Answer: (A)

In suspected carbon monoxide poisoning, the immediate priority is to deliver high-concentration oxygen to rapidly displace CO from hemoglobin and improve tissue oxygen delivery. Giving 100% oxygen now speeds the elimination of carboxyhemoglobin and reduces ongoing hypoxia, which is why EMS should administer high-flow oxygen, monitor vital signs, and arrange rapid transport to the ED. Hyperbaric oxygen therapy may be considered later if specific criteria are met (such as neurologic symptoms, pregnancy, or other risk factors) because it can further accelerate CO elimination and lessen neurologic injury, but it isn’t mandatory for every case upfront.

Delaying oxygen until arrival at the ED would prolong hypoxia and worsen outcomes, so that option isn’t appropriate. Aspirin has no role in treating CO poisoning, and ventilating with room air or postponing transport without supplemental oxygen would leave the patient inadequately treated during a critical window.