Abstract:
BACKGROUND:Transcutaneous electrical nerve stimulation (TENS) is often used for management of chronic pain. OBJECTIVE:The purpose of this study was to investigate whether TENS altered postincisional allodynia, substance P, and proinflammatory cytokines in a rat model of skin-muscle incision and retraction (SMIR). DESIGN:This was an experimental study. METHODS:High-frequency (100-Hz) TENS therapy began on postoperative day 3 and was administered for 20 minutes daily to SMIR-operated rats by self-adhesive electrodes delivered to skin innervated via the ipsilateral dorsal rami of lumbar spinal nerves L1-L6 for the next 27 days. The expressions of substance P, tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), and interleukin-1beta (IL-1β) in the spinal cord and mechanical sensitivity to von Frey stimuli (4g and 10g) were evaluated. RESULTS:The SMIR-operated rats displayed a marked hypersensitivity to von Frey stimuli on postoperative day 3. In contrast to the SMIR-operated rats, SMIR-operated rats after TENS administration showed a quick recovery of mechanical hypersensitivity. On postoperative days 3, 16, and 30, SMIR-operated rats exhibited an upregulation of substance P and cytokines (TNF-α, IL-6, and IL-1β) in the spinal cord, whereas SMIR-operated rats after TENS therapy inhibited that upregulation. By contrast, the placebo TENS following SMIR surgery did not alter mechanical hypersensitivity and the levels of spinal substance P, TNF-α, IL-6, and IL-1β. LIMITATIONS:The experimental data are limited to animal models and cannot be generalized to postoperative pain in humans. CONCLUSIONS:The results revealed that TENS attenuates prolonged postoperative allodynia following SMIR surgery. Increased levels of spinal substance P and proinflammatory cytokines, activated after SMIR surgery, are important in the processing of persistent postsurgical allodynia. The protective effect of TENS may be related to the suppression of spinal substance P and proinflammatory cytokines in SMIR-operated rats.
journal_name
Phys Therjournal_title
Physical therapyauthors
Chen YW,Tzeng JI,Lin MF,Hung CH,Wang JJdoi
10.2522/ptj.20130306subject
Has Abstractpub_date
2015-01-01 00:00:00pages
76-85issue
1eissn
0031-9023issn
1538-6724pii
ptj.20130306journal_volume
95pub_type
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