What should you do immediately if a casualty is unconscious?

When a person is unconscious, the first and most critical step is to check for responsiveness and ensure that their airway is clear. This step is vital because an unconscious person may have an obstructed airway, which can lead to suffocation and further complications. By checking responsiveness, you can assess if the person is breathing normally and if there is a chance they may regain consciousness.

Ensuring the airway is clear is essential because if the airway is blocked, the individual cannot breathe, which can quickly lead to life-threatening situations. Clearing the airway may involve rolling the person onto their side to maintain an open airway and prevent aspiration, depending on the circumstances.

Immediate action in this context allows a first responder to determine if further medical interventions, such as CPR or calling emergency services, are necessary based on the individual's condition. This initial assessment is crucial before any other actions, such as providing food or drink, which is inappropriate since an unconscious person cannot swallow safely, and leaving the person alone would neglect their immediate safety and health needs.