What should be administered immediately in the case of nitrous oxide overdose?

In the event of a nitrous oxide overdose, administering 100% oxygen is critical because it helps to quickly displace the nitrous oxide from the patient's bloodstream. Nitrous oxide can cause hypoxia, a condition where insufficient oxygen reaches the tissues, so providing pure oxygen enhances the body’s ability to correct any oxygen deficiency and aids in the elimination of nitrous oxide from the system. The increased flow of oxygen accelerates the recovery process and helps prevent potential complications of hypoxia.

Providing increased nitrous oxide would exacerbate the situation, while additional sedatives could further depress respiratory function, making the condition worse. Intravenous fluids, while supportive in some medical contexts, wouldn’t address the immediate respiratory and metabolic effects of the overdose. Thus, the administration of 100% oxygen is the most effective and appropriate response to mitigate the risks associated with nitrous oxide overdose.