Sabrina Seelig seemed too young to die. She arrived by ambulance at Wyckoff Heights Medical Center, long regarded as one of the most troubled hospitals in the city, at 11:05 a.m. on May 30, 2007, conscious and alert but complaining of vomiting and dizziness. She was given a sedative that put her into a deep sleep, and her wrists were tied to the bed. Ms. Seelig's case brings to mind the death of Libby Zion, an 18-year-old Bennington College freshman who died in 1984, eight hours after being admitted to New York Hospital, where she had been sedated and tied down. Ms. Zion's death led to changes in the training of young doctors across the country.