A 35-year-old woman is brought to the trauma centre 45 minutes after a fall from 15 feet. She is alert and oriented, with a GCS of 15. Examination reveals a 2 cm laceration over the left temporal region with mild swelling. Vital signs are normal. Non-contrast CT head shows a 20 mm epidural hematoma with no midline shift and no mass effect. What is the most appropriate next step in management?