Glasgow Coma Scale Score in Surgery — 50yo Man | Neurosurgery | SMLE Q#16145

A 50-year-old man is brought to the emergency department after falling 20 feet from a scaffolding at a construction site. On arrival he is obtunded with a Glasgow Coma Scale score of 8 and no obvious external signs of head injury. His vital signs are: T: 36.8 °C, BP: 90/50 mmHg, HR: 112/min, RR: 18/min (on ventilator), SpO2: 99% on mechanical ventilation with 40% FiO2. He is intubated for airway protection and placed on mechanical ventilation. Hemodynamic monitoring shows a mean arterial pressure (MAP) of 65 mmHg, and invasive neuromonitoring demonstrates an intracranial pressure (ICP) of 15 mmHg. Which of the following is the most likely cerebral perfusion pressure (CPP) in mmHg for this patient?