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?:definition
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A relationship between a defined repeating activity and one of the following that may trigger the repeating activity to stop, where all items are part of a global library:- another defined activity where the repeating activity stops if this other activity occurs- a defined observation result where the repeating activity stops if this observation result occurs- a defined criteria group where the repeating activity stops if this group logically evaluates to true based on its components Example: Continue repeating kidney dialysis until kidney transplant surgery. Continue performing a certain lab test weekly until the three-month checkup occurs. (target = another activity)Continue substance administration of drug X until the blood pressure is over some minimum threshold number. (target = observation result from another activity that is an observation)Continue substance administration of drug Y until the blood pressure is over some minimum threshold number and either the result of a certain lab test is positive or the subjects temperature is elevated, i.e. \'(A and (B or C))\'.
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