What should the EMT do first for a patient who has been exposed to fumes from a chemical drain cleaner?

In cases of exposure to toxic fumes, particularly from chemical drain cleaners, the initial priority is to ensure adequate oxygenation. Administering supplemental oxygen is crucial because inhalation of noxious fumes can lead to respiratory distress and decreased oxygen saturation. Providing supplemental oxygen helps to alleviate hypoxia and supports respiratory function, especially if the victim is experiencing difficulty breathing or if the chemical exposure has affected their oxygen levels.

While other interventions may be warranted depending on the patient's condition, they should come after ensuring that the patient is receiving sufficient oxygen. Immediate transport is essential in such cases as well, but the administration of oxygen plays a critical role in stabilizing the patient's condition during that transport.