Final answer:
In the emergency situation described, the care providers should treat an organ donor patient exactly the same as a non-donor, prioritizing patient survival, with CPR used in the event of cardiac arrest to preserve the patient and potential organ viability.
Step-by-step explanation:
If it is discovered that a seriously injured patient is an organ donor and an arrest is anticipated, the emergency care providers should treat the patient the same as a non-donor. In all cases of emergent patient care, the priority is always to preserve the life of the patient, regardless of any potential organ donation. The use of CPR (cardiopulmonary resuscitation) would be the immediate course of action if the patient's condition deteriorates to cardiac arrest. This is because maintaining circulation and oxygenation is critical for the survival of the patient and, by extension, the viability of organs for transplantation should the patient not survive despite all efforts.