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Quantifying meaningful changes in pain

W I Campbell1, C C Patterson

  • 1Department of Anaesthetics, UNDAH Trust, Ulster Hospital, Dundonald, Belfast, Northern Ireland.

Anaesthesia
|April 16, 1998
PubMed
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Nurses and patients agree on meaningful pain reduction levels. Post-surgery, patients require greater pain reduction percentages for meaningful relief, varying by initial pain intensity.

Area of Science:

  • Pain Management
  • Analgesia Research
  • Patient-Reported Outcomes

Background:

  • Assessing meaningful pain reduction is crucial for effective analgesia.
  • Visual Analogue Scales (VAS) are commonly used to quantify pain intensity.
  • Understanding patient expectations of pain relief is vital in clinical practice.

Purpose of the Study:

  • To determine the smallest meaningful reduction in pain across different initial pain intensities.
  • To compare nurses' and patients' perceptions of meaningful pain reduction.
  • To evaluate changes in perceived meaningful pain reduction before and after surgery.

Main Methods:

  • 138 nurses and 110 patients rated smallest meaningful pain reduction on 100 mm VAS for hypothetical pain levels (100, 75, 50, 25).

Related Experiment Videos

  • Patients' perceptions were assessed pre- and post-lower third molar extraction under general anesthesia.
  • Median values and percentage reductions were calculated to analyze meaningful pain relief.

    • Main Results:

    • Nurses' median meaningful pain reductions were 31%, 32%, 36%, and 40% for initial pains of 100, 75, 50, and 25 mm, respectively.
    • Patients' pre-operative expectations closely mirrored nurses' ratings (26-44% reduction).
    • Post-operatively, patients required greater VAS reductions (31-48%) for meaningful relief, varying with initial pain intensity.

    Conclusions:

    • Meaningful pain reduction is relative and depends on the initial pain level.
    • Post-surgical pain management requires considering the increased threshold for meaningful relief.
    • VAS-based percentage reductions for meaningful pain relief range from 31% to 48% post-operatively.