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| 21KF-019 |
Predictive Value of the Phase Angle for Analgesic Efficacy in Lumbosacral Transforaminal Block
Department of Anesthesiology and Pain Medicine, Samsung Medical Center, College of Medicine, Sungkyunkwan University, Seoul, Republic of Korea1
Department of Anesthesiology and Pain Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea2
Introduction: 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 bloodl 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.
Materials and Methods: 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 minutes following the block; clinical data and the PA were compared.
Results: Among the 109 included patients, 50 (45.9%) and 59 (54.1%) had ≥50% and <50% pain reduction, respectively. 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.
Conclusions: A PA change ratio of <0.087 at 5 min following lumbar transforaminal blocks predicted non-responders with high specificity.
References:
1. Lee, J.Y.; Kim, E.D.; Kim, Y.N.; Kim, J.S.; Sim, W.S.; Lee, H.J.; Park, H.J.; Park, H.J. Correlation of Perfusion Index Change and Analgesic Efficacy in Transforaminal Block for Lumbosacral Radicular Pain. J. Clin. Med. 2019, 8, 51.
2. Jung, Y.W.; Hong, N.; Kim, C.O.; Kim, H.C.; Youm, Y.; Choi, J.; Rhee, Y. The diagnostic value of phase angle, an integrative bioelectrical marker, for identifying individuals with dysmobility syndrome: The Korean Urban-Rural Elderly study. Osteoporos. Int. 2020
Materials and Methods: 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 minutes following the block; clinical data and the PA were compared.
Results: Among the 109 included patients, 50 (45.9%) and 59 (54.1%) had ≥50% and <50% pain reduction, respectively. 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.
Conclusions: A PA change ratio of <0.087 at 5 min following lumbar transforaminal blocks predicted non-responders with high specificity.
References:
1. Lee, J.Y.; Kim, E.D.; Kim, Y.N.; Kim, J.S.; Sim, W.S.; Lee, H.J.; Park, H.J.; Park, H.J. Correlation of Perfusion Index Change and Analgesic Efficacy in Transforaminal Block for Lumbosacral Radicular Pain. J. Clin. Med. 2019, 8, 51.
2. Jung, Y.W.; Hong, N.; Kim, C.O.; Kim, H.C.; Youm, Y.; Choi, J.; Rhee, Y. The diagnostic value of phase angle, an integrative bioelectrical marker, for identifying individuals with dysmobility syndrome: The Korean Urban-Rural Elderly study. Osteoporos. Int. 2020
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