mrcem2-0065

A 15 year old male is brought to the emergency department by his parents after he fell while climbing over a fence and sustained a deep cut to the arm where the metal spike pierced the skin. An X-ray reveals no bone damage. You opt to examine and cleanse the wound under sedation as the patient is extremely upset. You choose to sedate the patient with Ketamine. What is the main way in which Ketamine works?