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Minimum clinically significant VAS differences for simultaneous (paired) interval serial pain assessments.

Loren G Yamamoto¹, Jason T Nomura, Renee L Sato

¹Emergency Department, Kapiolani Medical Center For Women And Children, and Department of Pediatrics, University of Hawaii John A. Burns School of Medicine, Honolulu, Hawaii, USA. Loreny@hawaii.edu

The American Journal of Emergency Medicine

|June 18, 2003

Summary

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The minimum clinically significant difference in pain assessment using the visual analog scale (VAS) is 0.5 cm or less for simultaneous or near-simultaneous comparisons. This is significantly smaller than the 1.3 cm difference for assessments made 20-30 minutes apart.

Area of Science:

Pain Management
Clinical Research Methodology

Background:

The visual analog scale (VAS) is widely used for pain assessment.
Determining the minimum clinically significant difference (MCSD) is crucial for interpreting pain scores.
Previous research suggests an MCSD of 1.3 cm for pain assessments at 20-30 minute intervals.

Purpose of the Study:

To investigate if the MCSD for pain using VAS is smaller for nearly simultaneous or brief-interval serial assessments compared to longer intervals.
To establish a more precise MCSD for acute pain comparisons.

Main Methods:

Two studies were conducted: a blinded, randomized, placebo-controlled trial for intravenous cannulation pain and a non-blinded, randomized trial for jellyfish sting pain.
Both studies utilized a 10-cm VAS for pain intensity measurement.

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Paired comparisons of pain were analyzed for differences perceived by subjects.

Main Results:

In the first study, 30% of subjects reporting pain differences noted a VAS difference of 1.0 cm or less (minimum 0.5 cm).
In the second study, 93% of observed VAS differences of 0.5 cm or less were recognized by subjects.
These findings indicate that a VAS difference of approximately 0.5 cm or less is clinically significant for simultaneous or brief-interval comparisons.

Conclusions:

The MCSD for pain assessment using VAS is approximately 0.5 cm or less for simultaneous or brief-interval (within 5 minutes) paired comparisons.
This value is substantially lower than the established MCSD for longer assessment intervals.
The MCSD may vary depending on the type of pain and comparison interval.