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  • Title: Multiple dose gabapentin attenuates cutaneous pain and central sensitisation but not muscle pain in healthy volunteers.
    Author: Segerdahl M.
    Journal: Pain; 2006 Nov; 125(1-2):158-64. PubMed ID: 16781073.
    Abstract:
    Various muscle pains constitute a large clinical problem, both for patients and clinicians. Gabapentin is an established therapy in neuropathic pain and reduces cutaneous pain in healthy volunteers. Gabapentin in combination with other analgesics reduces post-operative pain. No data exist on the effect of gabapentin on muscle pain. This study investigates the effect of gabapentin on muscle and cutaneous pain in healthy volunteers. Sixteen healthy volunteers, 8 male/8 female, were included in this double-blind three-session crossover study comparing the effects of 0, 1200, 1800 and 2600 mg (pre-treatment, titrated over 4 doses) gabapentin and placebo. Muscle pain was induced by infusing 0.5 ml of hypertonic saline into the anterior tibial muscle. Simultaneously, subjects graded pain on a computerized visual analog scale (VAS, 0-10). Total (AUC, VAS*duration in s) and maximal pain (VAS(max)) were assessed. Areas of local and referred pain were measured. Further, continuous intracutaneous electrical stimulation was applied to the forearm. Current was increased until pain intensity 5/10 or until subjects reached a cut-off of 70 mA. Spontaneous pain (VAS 0-10), areas of secondary hyperalgesia to pinprick (cm2) and mechanical pain threshold (g) within this area were assessed. Gabapentin pre-treatment reduced sensitivity to electrical induction of skin pain by 14%, p=0.016. Secondary hyperalgesia was induced, but areas were reduced after pre-treatment, p<0.05. Mechanical pain thresholds were unaffected. Pain induced by intramuscular infusion of hypertonic saline was not affected by gabapentin. In conclusion, single or repeated dosing of gabapentin reduced cutaneous but not muscle pain in healthy volunteers.
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