Lubamatud vead on sellised kahju- ja ohujuhtumid, mis on üheselt mõistetavad (selgelt tuvastatavad ning mõõdetavad), tõsised (mille tulemuseks on patsiendi surm või raske tervisekahjustus) ja enamasti välditavad.
Never events are used to signify adverse events that are unambiguous (clearly identifiable and measurable), serious (resulting in death or significant disability), and usually preventable.
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