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Logo for the Journal of Rehab R&D
Volume 43 Number 4, July/August 2006
Pages 565 — 572

Abstract - Antinociceptive effect of linear polarized 0.6 to 1.6 mm irradiation of lumbar sympathetic ganglia in chronic constriction injury rats

Hiroshi Muneshige, MD, PhD (deceased);1 Katsuhiro Toda, MD, PhD;1* Dianli Ma, MD, PhD;2 Hiroaki Kimura, MD, PhD;1 Tomohiro Asou, MD;1 Yoshikazu Ikuta, MD, PhD2

1Department of Rehabilitation, Hiroshima University Hospital, Hiroshima, Japan; 2Department of Orthopaedic
Surgery, Hiroshima University School of Medicine, Hiroshima, Japan
Abstract — Linear polarized near-infrared light created with linear polarized near-infrared light therapy equipment (Super LizerTM HA-550, Tokyo Iken Co, Ltd, Tokyo, Japan) has been used for the treatment of various painful disorders in Japan. Irradiation near the stellate ganglion with a Super Lizer (ISGL) is an especially notable therapeutic method used with stellate ganglion block (SGB) or substitutes for SGB. ISGL is a safe, simple, well-tolerated, and effective treatment. We examined the effects of irradiation with a Super Lizer applied to an area near the lumbar sympathetic ganglia on the ligated side in a chronic constriction injury (CCI) model, which is believed to be an animal model of complex regional pain syndrome (CRPS). Rats showing thermal hyperalgesia in a radiant heat test 1 wk postoperatively were used in Experiments 1 and 2: (1) Thermal hyperalgesia of irradiation group (n = 11) was less than that of the control or nonirradiation (n = 11) group at 1, 3, and 8 h after irradiation; however, the effect disappeared 12 h after irradiation. (2) Daily irradiation (n = 16) and 1 wk (n = 14) from 7 days after nerve ligation significantly shortened the interval from thermal hyperalgesia until recovery. Rats showing mechanical hyperalgesia in the von Frey hair test 1 wk postoperatively were used in Experiment 3: 1 wk irradiation beginning 7 days after nerve ligation (n = 9) did not promote the recovery from mechanical hyperalgesia. We speculate that repeated ISGL may be more effective than a single ISGL in alleviating pain in CRPS patients. We cannot explain the discrepancy between the results obtained in Experiments 2 and 3. We believe the results of this study are relevant to the effect of ISGL for patients with upper-limb CRPS: irradiation near the lumbar sympathetic ganglia of the rat is effective for thermal but not mechanical pain in CCI.
Key words: chronic constriction injury model, complex regional pain syndrome, control study, ISGL, linear polarized near-infrared light, reflex sympathetic dystrophy, rehabilitation, stellate ganglion block, Super Lizer.

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