Then I discovered that a patient safety movement had been spawned 20 years ago when mortality rates from anesthesia caused a spike in liability premiums. The mortality rate has been reduced from 1 in 10,000 to 1 in 200,000 (1). Brennan, Leape, Bates, and others in the Harvard Medical Practice Study later broke ground in medical error studies in the early 1990s (2,3).