• Hoda Chookalayi, Mehdi Heidarzadeh, Mohammad Hasanpour, Sajjad Jabrailzadeh, and Fatemeh Sadeghpour.
• Department of Critical Care Nursing, School of Nursing and Midwifery, Ardabil University of Medical Sciences, Ardabil, Iran.
• Indian J Crit Care Med. 2017 Jul 1; 21 (7): 429-435.

Background And AimsThe nonverbal pain scale is one of the instruments which study pain in nonverbal-ventilated patients with regard to the changes of behavioral and physiological indices. The purpose of the study is to survey the psychometric properties of revised-nonverbal pain scale (R-NVPS) and original-nonverbal pain scale (O-NVPS) in ventilated patients hospitalized in critical care units.Materials And MethodsFour nurses studied pain in sixty patients hospitalized in trauma, medical, neurology, and surgical critical care units using R-NVPS and O-NVPS at six times (before, during, and after nociceptive and nonnociceptive procedures). The test was repeated in 37 patients after 8-12 h.ResultsCronbach's alpha coefficient for R-NVPS and O-NVPS was 0.8 and 0.76, respectively. The inter-rater correlation coefficient during different times was r = 0.89-0.96 for R-NVPS and r = 0.80-0.87 for O-NVPS. Test-retest correlation coefficient for R-NVPS and O-NVPS was r = 0.55-0.86 and r = 0.51-0.75, respectively. The meaningful difference in pain score between nociceptive and nonnociceptive procedures (P < 0.001) and a higher pain score in patients who confirmed pain (P < 0.001) showed a discriminant and criterion validity for both scales of NVPS, respectively.ConclusionsR-NVPS and O-NVPS can both be used as valid and reliable scales in studying pain in ventilated patient. However, in comparing the items, "respiration" (R-NVPS) had a higher sensitivity than "physiology II" (O-NVPS) in assessing pain.

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