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Expectation interventions like verbal suggestion can significantly improve pain relief for patients. These methods are effective adjunctive strategies, particularly for acute procedural pain, enhancing analgesic treatment outcomes.

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Area of Science:

  • Psychology of Pain
  • Clinical Pain Management
  • Evidence-Based Medicine

Background:

  • Patient expectations significantly influence analgesic treatment outcomes, similar to placebo effects.
  • Verbal suggestion, conditioning, and mental imagery are brief interventions that can induce expectations.
  • Existing evidence primarily comes from healthy samples, limiting applicability to clinical populations.

Purpose of the Study:

  • To meta-analyze the effects of expectation interventions on pain relief in clinical populations.
  • To evaluate the efficacy of verbal suggestion, conditioning, and imagery for pain management.
  • To determine if findings from healthy samples translate to patients with various pain types.

Main Methods:

  • Systematic literature search across five databases for relevant studies.
  • Inclusion of studies assessing expectation interventions (verbal suggestion, conditioning, imagery) in clinical pain.
  • Quantitative analysis of 27 studies (from 30 meeting criteria) comparing interventions to control conditions.

Main Results:

  • A medium overall effect size (Hedges g = 0.61) was found for expectation interventions on pain relief.
  • Verbal suggestion showed a large effect (g = 0.75), conditioning a moderate effect (g = 0.65), and imagery a small effect (g = 0.27).
  • Interventions had medium to large effects on experimental/acute procedural pain and small effects on chronic pain.

Conclusions:

  • Expectation interventions are effective in relieving pain in clinical settings.
  • Verbal suggestion is particularly effective for managing acute procedural pain.
  • These findings support the use of expectation interventions as adjunctive strategies in pain management.