A video screen shows a man in his late 60s lying awake on an operating table. Just outside the camera's view, a doctor is moving his finger in front of the man's face, instructing him to follow it back and forth with his eyes. Seconds later, after a dose of the powerful anesthetic drug propofol, his eyelids begin to droop. Then his pupils stop moving. Only the steady background beeping of the heart monitor serves as a reminder that the man isn't dead. "He's in a coma," the doctor, Emery Brown, explains. "General anesthesia is a drug-induced reversible coma."
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