What is the most critical step when dealing with a patient who is unconscious but breathing?

In the scenario of an unconscious but breathing patient, ensuring the airway is clear is the most critical step. This is essential because an unconscious patient is unable to protect their airway, making them prone to airway obstruction from the tongue or other foreign materials. If the airway is not maintained and protected, the patient could stop breathing, leading to severe hypoxia and other life-threatening complications.

Once the airway is ensured to be clear, other assessments and interventions, such as monitoring vital signs, checking for spinal injuries, or initiating CPR if necessary, can follow. However, without a clear airway, the patient's condition can quickly deteriorate. Therefore, managing the airway takes priority in emergency situations involving an unconscious patient.