Only one patient expressed his pain spontaneously, whereas all of the others waited for the nurse to ask how much pain they were in. They differed in their ability to use VAS and NRS for assessing their pain. In the second measurement, 11% of patients were unable to assess their pain with VAS, whereas one was unable to use the NRS. The failure rate at the other measurements ranged from 5% to 7%. The degree of problems patients had assessing their pain depended on sedation levels.
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