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Visual analog scale rating change cut-offs for detection of improvement in nausea severity

Robert Meek^1,2, Andis Graudins^1,2

¹Monash Health, Melbourne, Victoria, Australia.

Emergency Medicine Australasia : EMA

|April 6, 2019

Abstract

Objective:

To determine accuracy and best cut-point of measured and percentage visual analog scale (VAS) change for detection of symptom improvement.

Methods:

A 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.

Results:

Area 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%.

Conclusion:

Accuracy of VAS change for detection of symptom improvement is good to excellent. Use of this outcome measure in future ED antiemetic trials is supported.

Keywords:

emergency department nausea outcome measures

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