Comparison of the feline Glasgow Composite Measured Pain Scale in a feline population without painful disease at home and in a veterinary hospital: a prospective clinical study

ObjectivesThe objective of this study was to compare the use of the feline Glasgow Composite Measured Pain Scale (CMPS-f) at home and in a veterinary hospital. The hypothesis was that pain-free cats would score higher in the CMPS-f when in a stressful situation than when calm and relaxed; that is, healthy but stressed cats could appear to be in discomfort or pain.MethodsHealthy, non-painful adult cats owned by clinical staff were included in a prospective clinical trial with two observers (caregiver [CG] and researcher). Cats were scored by their CG at home (H), after arrival at the clinic (C1) and after a routine health check (C2). A researcher pain-scored the cats at C1 and C2 concurrently with the CG. Friedmann's test with Dunn's multiple comparison test was used. The level of significance was set to an alpha of 5%.ResultsData from 17 cats were included in the statistical analysis. Scores by the CG and researcher at C2 were higher compared with H (<i>P</i> <0.01 and <i>P</i> <0.01, respectively) and C1 (<i>P</i> = 0.02 and <i>P</i> <0.01, respectively). The mean increase in CMPS-f scores from H to C2 and from C1 to C2 was 5.8 and 4.1, respectively. At C2, the CMPS-f intervention level of 5/20 and above, indicating pain, was reached in 11/17 cats. There was no significant difference in the scores assigned by the CG and researcher within each time point.Conclusions and relevancePain scores recorded after examinations in the clinic were significantly higher than those recorded at home. This suggests that stress may lead to a misinterpretation of the CMPS-f, potentially affecting the recognition of pain in cats during clinical assessments.