A patient with suspected C5 spinal cord injury is brought to the Emergency Department. They present with flaccid paralysis of their upper extremities and complain of difficulty breathing. Which initial intervention is MOST appropriate to ensure the patient's safety and prevent further injury?
Assess and support airway and breathing, preparing for potential ventilatory support.
Provide IV analgesia to manage pain and prevent shock from severe pain.
Administer high-dose methylprednisolone within the first hour of injury to reduce inflammation.
Maintain immobilization with a hard collar and spine board, awaiting radiographic evaluation.