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Postamputation pain: studies on mechanisms.

Lone Nikolajsen1

  • 1Department of Anaesthesiology, Aarhus University Hospital, Norrebrogade 44, 8000 Aarhus C, Denmark. nikolajsen@dadlnet.dk

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|November 20, 2012
PubMed
Summary
This summary is machine-generated.

Phantom limb pain is common after amputation. This research explored pain mechanisms, finding pre-amputation pain and nerve sensitization contribute to phantom limb pain, while spinal cord and brain factors also play a role.

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Area of Science:

  • Pain research
  • Neurology
  • Surgical outcomes

Background:

  • Amputation frequently results in phantom limb pain (PLP) and stump pain, significantly impacting patient quality of life.
  • While PLP often diminishes over time, a persistent severe form affects 5-10% of amputees, posing treatment challenges.
  • Current treatment guidelines for neuropathic pain are often adapted for post-amputation pain management.

Purpose of the Study:

  • To investigate the underlying mechanisms contributing to the development and persistence of phantom limb pain and stump pain following amputation.
  • To evaluate the role of pre-amputation pain, perioperative interventions, peripheral nerve changes, and central sensitization in post-amputation pain.

Main Methods:

  • A series of ten studies (I-X) were conducted, analyzing pre-amputation pain, the effects of perioperative epidural blockade, pressure pain thresholds, neuroma characteristics, and the efficacy of pharmacological agents (ketamine, memantine, gabapentin).
  • Investigated the influence of supraspinal factors, such as catastrophizing, on phantom limb pain.
  • Utilized human neuroma tissue analysis to examine sodium channel expression.

Main Results:

  • Pre-amputation pain was identified as a significant risk factor for developing phantom limb pain.
  • Perioperative epidural blockade did not reduce the incidence of post-amputation pain or abnormal sensory phenomena.
  • Evidence suggests peripheral sensitization (e.g., sodium channel upregulation in neuromas) and central sensitization (e.g., NMDA receptor involvement) contribute to phantom limb pain.
  • Supraspinal factors, including catastrophizing, are associated with phantom limb pain.

Conclusions:

  • The findings confirm that multiple mechanisms, encompassing peripheral, spinal, and supraspinal factors, are implicated in the pathophysiology of post-amputation pain.
  • Understanding these complex mechanisms is crucial for developing more effective therapeutic strategies for phantom limb pain and stump pain.