Predictive value of the phase angle for analgesic efficacy in lumbosacral transforaminal block

Jeayoun Kim, Hue Jung Park, Woo Seog Sim, Seungwon Lee, Keoungah Kim, Woo Jin Kim, Jin Young Lee

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanism of low back and leg pain involves mixed neuropathic and nociceptive components. Spinal neuropathic pain is related to increased levels of inflammatory cytokines and disrupted and increased permeability of the blood–spinal cord barrier, originally composed of tight junctions of capillary endothelial cells surrounded by lamina. The phase angle (PA) estimates cell membrane integrity using bioelectrical impedance analysis. We evaluated the predictive value of the PA for analgesic efficacy in lumbosacral transforaminal block. We retrospectively collected data from 120 patients receiving transforaminal blocks for lumbosacral radicular pain and assessed the PA before and 5 min following the block. Responders (group R) and non-responders (group N) were defined by ≥50% and <50% pain reduction, respectively, on the numerical rating scale, 30 min following the block; clinical data and the PA were compared. Among the 109 included patients, 50 (45.9%) and 59 (54.1%) had ≥50% and <50% pain reduction, respectively. In group N, the PA change ratio showed 88.1% specificity, 32.0% sensitivity, and 62.4% accuracy; a ratio of <0.087 at 5 min following the block predicted non-response. A PA change ratio of <0.087 at 5 min following lumbar transforaminal blocks predicted non-responders with high specificity.

Original languageEnglish
Article number240
Pages (from-to)1-9
Number of pages9
JournalJournal of Clinical Medicine
Volume10
Issue number2
DOIs
StatePublished - 2 Jan 2021

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Lumbosacral
  • Pain
  • Phase angle
  • Radicular
  • Transforaminal block

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