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[Clinical and immunological characteristics and predicted factors of vision outcome in patients with acute severe bilateral optic neuritis].

Objective: To analyze the clinical and immunological characteristics of acute severe bilateral optic neuritis, and to explore the predictive factors of vision outcome and relapse so as to save visual function and avoid or alleviate vision disability. Methods: Forty-eight inpatients confirmed with acute severe bilateral optic neuritis from January 2013 to June 2015 were included and followed up. The clinical features, immunological findings, optic nerve imaging, visual function outcome and predictors of relapse were statistically analyzed. Results: Acute severe bilateral optic neuritis accounted for 7.3% of the total number of optic neuritis in the same period. There were 35 cases (72.9%) with monophasic course, and 13 cases (27.1%) with recurrence or other central nervous system involvement during the follow-up period; 11 (22.9%) in 48 patients with positive AQP4-IgG; AQP4-IgG-positive patients had a higher recurrence rate ( P <0.001) and poorer visual function prognosis ( P =0.034) than antibody-negative patients; the baseline visual acuity ( P =0.004), early treatment response ( P =0.012) and number of involved optic nerve segments ( P =0.016) were associated with end point visual function. Positive AQP4-IgG( OR 13.486, 95% CI 1.971-16.263)and combining with other autoimmune antibodies ( OR 5.591, 95% CI 1.502-15.621)were independently associated with relapse. Conclusions: Acute severe bilateral optic neuritis is not unusual and may cause blindness or visual disability. The positive rate of AQP4-IgG and the recurrence rate of the disease are low in our study. The necessity for long-term immunotherapy requires individual consideration. The baseline visual acuity, involved segment number of optic nerve and response to early treatment are associated with prognosis of visual function. Patients with AQP4-IgG positive and other autoimmune antibodies are easy to relapse. Whether the antibody-negative bilateral optic neuritis is a heterogeneous disease and the relationship with classic NMO or NMOSD deserve further research.

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