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Management of chronic foot lameness with 2% ammonium chloride on the palmar digital nerves

2018; Wiley; Volume: 32; Issue: S10 Linguagem: Inglês

10.1111/eve.12972

2042-3292

Stéfano Leite Dau, Marcela de Azevedo, Flávio Desessards De La Côrte, K.E. Brass, F. Ceni, C. Cantareli,

Veterinary Pharmacology and Anesthesia

Summary This case series describes the analgesic effect of 2% ammonium chloride (2% AC) in horses with chronic foot pain. Ten horses with foot pain related to chronic laminitis (n = 1), bruised sole (n = 1), distal interphalangeal joint (DIPJ; n = 1), podotrochlear apparatus (PA; n = 4) and PA associated with DIPJ (PA + DIPJ; n = 3) received perineural injections with 3 mL of 2% AC on the palmar digital nerves. A Five horses with pain related to PA + DIPJ (n = 3), PA (n = 1) and DIPJ (n = 1) were treated with saline as control. The analgesic effect was evaluated as lameness improvement (LI) rate (%) using a body‐mounted inertial sensor system, and was assessed at 5, 12, 19, 35, 47 and 62 days after treatment. Horses treated with 2% AC demonstrated a mean LI rate above 50% from Day 12 (63% ± 26) to Day 62 (65% ± 26). Control horses has a overall LI of 28% (± 23%) and a LI above 50% was evidenced in horses with PA + DIPJ (n = 2) and PA pain (n = 1) at different times. Horses with PA pain presented higher LI rates (72% ± 23) than that presented by horses with PA + DIPJ (51% ± 9) or DIPJ (51% ± 19). Horses with severe radiographic lesions of the navicular bone and DIPJ had the lowest LI rates after treatment. The 2% AC is a useful treatment to be included in the clinical management of chronic foot pain involving the podotrochlear apparatus with mild radiographic lesions.