The role of afferent input in postamputation pain: A randomized, double-blind, placebo-controlled crossover study

Nina Stockfleth Buch, Peter Ahlburg, Simon Haroutounian, Niels Trolle Andersen, Nanna Brix Finnerup, Lone Nikolajsen

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

In this randomized, double-blind, placebo-controlled crossover study, we investigated whether a peripheral nerve block could temporarily eliminate phantom and stump pain after amputation. Amputees with constant postamputation pain were included and randomized to receive a nerve block with lidocaine 2% with adrenaline or saline in a crossover design. Spontaneous phantom and stump pain and evoked responses were assessed at baseline and at fixed time-points until 120 minutes after lidocaine or saline injection. The primary outcome was the difference in absolute change between worst pain intensity, either phantom or stump pain, at baseline and at 30 minutes after lidocaine or saline injection. Twelve amputees were randomized and 9 patients were included in the analysis. The absolute change in median worst pain intensity between lidocaine and saline injection was -2.0 (interquartile range, -4.0 to 0.0) (n = 9, P = 0.12). Nine of 9 patients reported at least some pain relief after lidocaine injection compared with only 2 of 9 patients after saline injection (P = 0.02). Phantom pain intensity was significantly reduced after lidocaine compared with saline injection (P = 0.04), whereas there was no significant change in stump pain intensity between the 2 interventions (P = 0.17). In all 9 amputees, evoked responses were eliminated after lidocaine injection. Thus, our findings suggest that afferent input from the peripheral nervous system plays an important role in postamputation pain.

Original languageEnglish
Pages (from-to)1622-1633
Number of pages12
JournalPain
Volume160
Issue number7
DOIs
StatePublished - Jul 1 2019

Keywords

  • Peripheral nerve block
  • Phantom pain
  • Postamputation pain
  • Stump pain

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