What is the most appropriate action for a man in respiratory distress with urticaria?

In the scenario of a man experiencing respiratory distress alongside urticaria, administering supplemental oxygen at 12 to 15 L/min is a critical action to address the immediate need for oxygenation. This level of supplemental oxygen is employed to ensure that the patient receives adequate oxygen, especially when respiratory distress is evident. The urgency of this situation often indicates that the patient's airway may be compromised, either due to swelling associated with the urticaria or another underlying cause.

Immediate oxygenation can help to prevent further respiratory complications and stabilize the patient's condition until more definitive treatments, such as epinephrine for an allergic reaction, can be provided. In emergency situations like this, ensuring adequate oxygen flow is paramount as hypoxia (lack of oxygen) can lead to significant physiological strain on the body and further deteriorate the patient’s condition.

Other actions, while important in the overall management of the patient, do not address the immediate risk of inadequate oxygenation. Checking for an epinephrine auto-injector may be useful if allergy history is confirmed, but without immediate oxygenation, the patient could continue to deteriorate. Inspecting for urticaria by removing the shirt does not provide immediate relief of symptoms that require urgent intervention. Obtaining vital signs and a SAMPLE history