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Emerg Med Australas · Aug 2019
Visual analog scale rating change cut-offs for detection of improvement in nausea severity.
- Robert Meek and Andis Graudins.
- Monash Health, Melbourne, Victoria, Australia.
- Emerg Med Australas. 2019 Aug 1; 31 (4): 673-675.
ObjectiveTo determine accuracy and best cut-point of measured and percentage visual analog scale (VAS) change for detection of symptom improvement.MethodsA pooled analysis of three previously published studies was conducted. All patients had baseline and 30 min VAS ratings linked to described symptom change. A receiver operating characteristic curve analysis was performed.ResultsArea under the curve for detecting symptom improvement was 0.86 (95% CI 0.83-0.90) and 0.87 (95% CI 0.84-0.90) for measured and percentage VAS change. Best cut-points were -8 mm and -20%.ConclusionAccuracy of VAS change for detection of symptom improvement is good to excellent. Use of this outcome measure in future ED antiemetic trials is supported.© 2019 Australasian College for Emergency Medicine.
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