Final answer:
The nurse should position the patient in a semi-Fowler's position with the head of the bed elevated 30 degrees. The head should be in a neutral midline position and the neck properly supported.
Step-by-step explanation:
When admitting a patient following a craniotomy using the supratentorial approach, the neurologic ICU nurse should position the patient in a semi-Fowler's position with the head of the bed elevated approximately 30 degrees. This position helps to reduce intracranial pressure and promote cerebral perfusion. It also helps with respiratory and venous drainage.
The patient should also have the head in a neutral midline position to prevent any strain on the surgical incision site. Additionally, the nurse should ensure that the patient's neck is properly supported and aligned to maintain the airway and prevent any complications.