Diagnosing postoperative neuropathic pain: a Delphi survey.

BACKGROUND: Although postoperative pain is traditionally considered to be nociceptive in origin, a proportion of patients experience a significant neuropathic component to their pain experience. Diagnosing neuropathic pain in this setting is challenging, and there are no published guidelines or screening tools designed for use in the immediate postoperative setting. We hypothesized that acute pain specialists were diagnosing a neuropathic component to acute pain, and this study aimed to obtain an expert agreed list of pain characteristics that could be used to aid diagnosis.
METHODS: A three-round Internet-based Delphi survey of acute pain specialists was used to generate a list of acute neuropathic pain characteristics, and achieve consensus on the importance of each item. Items were ranked on a 1-10 scale of importance, with a median score of ≥ 7 considered important and an inter-quartile range of ≤ 3 indicative of consensus. Cronbach's α was used to investigate internal consistency.
RESULTS: Twenty-four items were generated by round 1 of the Delphi survey. Fourteen panellists participated in round 2, and 10 in round 3. After round 3, consensus of opinion was achieved for 13 items, with nine rated as important in the diagnosis of acute neuropathic pain.
CONCLUSIONS: The Delphi survey suggests that neuropathic pain in the immediate postoperative period is diagnosed in a different way to chronic neuropathic pain, with items such as response to medications considered more useful than signs such as those representing autonomic changes.