Final answer:
The unresponsive man may have consumed antifreeze, and administering high-flow oxygen is crucial in managing the poisoning.
Step-by-step explanation:
Based on the given information, it is likely that the unresponsive man has consumed antifreeze, which is a toxic substance that can cause severe health effects. The symptoms described, such as deep and rapid respirations, rapid and weak pulse rate, and dilated and sluggishly reactive pupils, are consistent with antifreeze poisoning. Antifreeze contains ethylene glycol, which is converted by the body into toxic metabolites that can cause organ damage and central nervous system depression.
Administering high-flow oxygen to the patient is a crucial first step in the management of antifreeze poisoning. Oxygen helps increase the oxygenation of tissues and prevents further damage. Additionally, it is vitally important to seek immediate medical attention as soon as possible.