Final answer:
The nurse should use restraints to protect the patient from injury.
Step-by-step explanation:
When performing Range of Motion (ROM) exercises on an unconscious patient with increased Intracranial Pressure (ICP), it is important to be cautious of the patient's reflex responses. Severe decerebrate posturing reflexes, such as the rigid body posture known as opisthotonos, can indicate neurological issues.
The nurse should a. use restraints to protect the patient from injury in this situation. The posturing reflexes can cause the patient to forcefully extend their arms and legs, which can lead to accidental self-injury.
Using restraints is necessary to ensure the safety of the patient and prevent further harm.