[pubmed] Therapeutic plasma exchange as adjunct therapy in 3 dogs with myasthenia gravis and myasthenia-like syndrome

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[pubmed] Therapeutic plasma exchange as adjunct therapy in 3 dogs with myasthenia gravis and myasthenia-like syndrome

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J Vet Emerg Crit Care (San Antonio). 2020 Nov 20. doi: 10.1111/vec.13022. Online ahead of print.


OBJECTIVE: To describe the use of therapeutic membrane-based plasma exchange (TPE) for treatment of clinical signs associated with suspected acquired myasthenia gravis (MG) in 3 dogs.

CASE SERIES SUMMARY: Three dogs presented with clinical signs consistent with acquired MG. All 3 dogs were medically managed prior to being treated with TPE. Two of the 3 dogs had increased acetylcholine receptor antibody titers that decreased after TPE. One dog diagnosed with primary MG became clinically normal after 2 sessions of TPE and continued to do well with medical management several months later. The second dog was diagnosed with a suspect thymoma, and TPE was performed as a bridge to surgery, with marked improvement of clinical signs after TPE. The dog was ultimately diagnosed with a thymic carcinoma. The third dog had a positive acetylcholine antibody titer and was ultimately diagnosed with hemangiosarcoma (spleen and liver) and invasive mediastinal thymoma. This dog developed severe pneumonia, was ventilator dependent, and died of multiple organ dysfunction. No immediate complications were observed secondary to TPE. All 3 dogs were concurrently treated with either immunosuppressive agents, anticholinesterase drugs, or both.

NEW OR UNIQUE INFORMATION PROVIDED: The use of TPE in dogs with MG appears to be well tolerated and safe. It may be a reasonable adjunct therapy to acetylcholinesterase drugs in cases that are not responding to medical management alone. Therapeutic plasma exchange might also be considered preoperatively to prevent postoperative complications in dogs with severe MG, although further studies should be performed.

PMID:33217167 | DOI:10.1111/vec.13022

Source: https://pubmed.ncbi.nlm.nih.gov/3321716 ... 5&v=2.13.0
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