You are dispatched to a local industrial plant for an electrical injury. you arrive on scene and find a 46-year-old male lying supine in front of an electrical panel. you are told he was attempting to make a repair and somehow received an electrical shock and was thrown to the ground. the scene is safe and the electricity is off. your initial exam reveals a conscious person, breathing adequately. vital signs are normal and there are no obvious signs of burns. coworkers state that he was unconscious until your arrival. what is the next step?