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  • Title: Efficacy of orally administered gabapentin in horses with chronic thoracic limb lameness.
    Author: Young JM, Schoonover MJ, Kembel SL, Taylor JD, Bauck AG, Gilliam LL.
    Journal: Vet Anaesth Analg; 2020 Mar; 47(2):259-266. PubMed ID: 31980368.
    Abstract:
    OBJECTIVE: To evaluate the analgesic effects of orally administered gabapentin on horses with chronic thoracic limb lameness. STUDY DESIGN: Randomized, crossover design. ANIMALS: A total of 14 adult horses with chronic thoracic limb lameness. METHODS: Following baseline measurement of lameness, horses were administered each of four treatments orally in grain: treatment G, gabapentin (20 mg kg-1) twice daily for 13 doses; treatment F, firocoxib (171 mg once, then 57 mg once daily for six doses); treatment GF, gabapentin and firocoxib at previously stated doses and frequencies; or treatment C, grain only as a control. Treatments were administered in a randomized, crossover design, separated by 2 weeks. Subjective lameness score (SLS), inertial sensor vector sum (VS) calculations, peak vertical ground reaction force (PVGRF) measurements and vertical impulse (VI) calculations were determined immediately prior to each initial treatment dose and 2-4 hours after the final treatment dose for each treatment. Mean change in SLS, VS, PVGRF and VI for each treatment were compared among treatments. RESULTS: The rank change in SLS of treatment GF was significantly greater than that of treatments C (p = 0.01) and G (p = 0.01) but not of treatment F (p = 0.08). No differences in VS (p = 0.4), PVGRF (p = 0.4) or VI (p = 0.1) were observed among treatments. CONCLUSIONS AND CLINICAL RELEVANCE: Gabapentin, as administered here, did not improve subjective or objective measures of lameness in horses with chronic thoracic limb musculoskeletal pain. Although subjective evaluation identified an improvement in lameness with treatment GF, it was not different from that observed with treatment F. Higher oral dosing and longer treatment regimens of gabapentin may be indicated for the treatment of chronic musculoskeletal pain in horses.
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