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Updated: Jul 9, 2026

Use of the Operant Orofacial Pain Assessment Device (OPAD) to Measure Changes in Nociceptive Behavior
Published on: June 10, 2013
Jacob C Hølen1, Ingvild Saltvedt, Peter M Fayers
1Pain and Palliation Research Group, Department of Cancer Research and Molecular Medicine, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway. jacob.chr.holen@medisin.ntnu.no
The Doloplus-2 tool shows poor criterion validity for assessing pain in cognitively impaired patients. Specific administration skills are needed for this behavioral pain assessment tool.
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