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Abbreviations: plasma exchange (PLEX), optic neuritis (ON), neuromyelitis optica spectrum disorder (NMOSD), AQP4 (aquaporin-4), multiple sclerosis (MS). *Among the 2 patients that were excluded because of PLEX intolerance, one had numbness and vomiting and the other had mild dizziness and paresthesias who elected to not continue with treatment.
