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Assessing analgesic use in patients with advanced cancer: Development of a new scale--the analgesic quantification algorithm
Pain Medicine, 01/10/2014  Clinical Article

Chung KC, et al. – The authors assessed whether the Analgesic Quantification Algorithm (AQA) is more sensitive than the World Health Organization Analgesic Treatment Ladder (WHO–AL) for quantifying analgesic medication use among patients with advanced cancer. The AQA represents a more sensitive measure of analgesic use than the WHO–AL, and may better determine whether changes in pain assessments in clinical trials are due to the intervention or changes in analgesic use.

Methods

  • An expanded equianalgesic potency conversion table was developed to establish oral morphine equivalents for use in the AQA.
  • Categories of opioid use were selected to increase sensitivity within the higher dose range of opioids and to better capture increases in analgesic dose intensity.
  • The resulting 8–point AQA scale corresponds to no analgesic use, non–opioid analgesics, weak opioids only, ≤75 mg, >75–150 mg, >150–300 mg, >300–600 mg, and >600 mg oral morphine equivalents per day.
  • Baseline and 6–month analgesic data from a clinical trial of cancer patients were compared for each instrument.

Results

  • At both time points, the 4–point WHO–AL demonstrated a ceiling effect with a clustering of patients in the strong opioid category, whereas the AQA resulted in a distribution of scores throughout the eight categories, including the five strong opioid categories.

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