• Hoda Chookalayia, Mehdi Heidarzadeh, Mohammad Hassanpour-Darghah, Masoomeh Aghamohammadi-Kalkhoran, and Mansoreh Karimollahi.
• Student Research Committee of Ardabil University of Medical Sciences, Ardabil, Iran.
• Intensive Crit Care Nurs. 2018 Feb 1; 44: 123-128.

ObjectiveThe Critical-Care Pain.ObservationTool is one of the instruments developed to assess pain in patients who are unable to communicate verbally. The study aimed to survey the psychometric properties of Critical-Care Pain.ObservationTool in four groups of non-verbal patients according to their Richmond Agitation Sedation Score (RASS).Study Design And Methodology65 critically ill patients (medical, surgical, trauma) were assessed using the critical care pain observation tool on six occasions (before, during and after nociceptive and non-nociceptive procedures). Patients were divided into four groups according to their RASS score: 1. All patients (RASS -3 to +2), 2. Sedated patients (RASS -3 to -1), 3. Restless patients (RASS +1), 4. Agitated patients (RASS +2).ResultsDiscriminant and criterion validity, confirmatory factor analysis and internal reliability showed good validity and reliability in the critical care pain observation tool in all groups except agitated patients. The results showed that, in general, the CPOT has good version of the critical care pain observation tool has good psychometric properties to evaluate pain in non-verbal patients admitted to intensive care units who have a RASS score ranging from -3 to +1, but it is not a good tool to evaluate pain in patients who are agitated according to RASS.Copyright © 2017 Elsevier Ltd. All rights reserved.

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