• David E Fosnocht, C Richard Chapman, Eric R Swanson, and Gary W Donaldson.
• Division of Emergency Medicine, University of Utah School of Medicine, Salt Lake City, UT 84132, USA. davefosnocht@comcast.net
• Am J Emerg Med. 2005 Jan 1; 23 (1): 55-9.

ObjectivesTo evaluate the validity of change in visual analog Scale (VAS) as a measure of pain relief using a verbal descriptor Scale (VDS) of change in pain.MethodsA prospective observational study of emergency department patients measured pain with VAS and recorded verbal report of change in pain.ResultsOne thousand four hundred ninety patients yielded 1999 comparisons between change in VAS and VDS. Correlation of change in VAS and VDS of change in pain was rho = 0.667 ( P < .001). A wide range of change in VAS, large standard deviations for the mean change in VAS, and discordance in the direction of change in VAS were present within each verbal descriptor category.ConclusionsChange in VAS is moderately correlated with a VDS of change in pain. Wide variability in change in VAS and discordance with a VDS demonstrate that change in VAS is not a valid indicator of pain relief for individual patients.

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