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Aquaporin 4 antibody [NMO Ab] status in patients with severe optic neuritis in India

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Abstract

Neuromyelitis optica (NMO) is an inflammatory demyelinating disease of the central nervous system that causes attacks of optic neuritis and transverse myelitis. The discovery of a specific serum marker for NMO-IgG antibody [aquaporin 4 antibody/AQP4 Ab] has revolutionised the treatment of demyelinating diseases. Severe vision loss can be seen in optic neuritis (ON) associated with both multiple sclerosis (MS) and NMO. Identifying this antibody in optic neuritis patients can help us to establish the likelihood of these patients developing NMO (Jarius et al. Neurol Sci 298:158–162, 2010). It is important to differentiate these two entities as the treatment strategies of MS and NMO are different. To the best of our knowledge, there is no published literature regarding the importance of identifying this antibody in severe optic neuritis in Indian patients. Hence we decided to screen our severe optic neuritis patients for this AQP4 Ab. To investigate the presence of aquaporin 4 antibody and determine its prognostic value for visual and neurological outcome, in patients with bilateral and recurrent [severe] ON without any previous neurological manifestations presenting to a neuro-ophthalmology clinic in India. Single centre, prospective study. 40 patients (27 female patients and 13 male) with severe optic neuritis [patients with no visual improvement by 4 weeks from onset of vision loss] who presented either as recurrent attacks or as bilateral and severe optic neuritis between January 2010 and June 2011 were enrolled. Clinical features, visual outcome and sequential neurological events were compared between the seropositive and the seronegative groups. Aquaporin 4 antibodies were detected from serum using ELISA technique and IIF technique. Presence of this antibody in the serum was considered to be seropositive status and patients who did not have this antibody were considered seronegatives. AQP4 antibodies were detected in 8 of the 40 patients with severe ON (20 %).The female to male ratio in the seropositive group was 8:0. The NMO antibody titer ranged from 0.3 to 760 U/ml. ANA positivity in seropositive patients was statistically significant (p = 0.043). All seropositive patients had significantly poorer visual outcome as compared with the seronegative patients (p = 0.04).

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Authors and Affiliations

  1. Department of Neuro-ophthalmology and Cataract, Sankara Nethralaya (A Unit of Medical and Vision Research Foundation), 18, College Road, Chennai, 600006, India

    Selvakumar Ambika & Akila Veeraputhiran

  2. Department of Microbiology, Sankara Nethralaya (A Unit of Medical and Vision Research Foundation), 18, College Road, Chennai, 600006, India

    Mahalakshmi Balasubramanian & Lily Theresa

  3. Department of Neurology, Sankara Nethralaya (A Unit of Medical and Vision Research Foundation), 18, College Road, Chennai, 600006, India

    Deepak Arjundas

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  1. Selvakumar Ambika
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  2. Mahalakshmi Balasubramanian
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  3. Lily Theresa
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  4. Akila Veeraputhiran
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  5. Deepak Arjundas
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Correspondence to Selvakumar Ambika.

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Ambika, S., Balasubramanian, M., Theresa, L. et al. Aquaporin 4 antibody [NMO Ab] status in patients with severe optic neuritis in India. Int Ophthalmol 35, 801–806 (2015). https://doi.org/10.1007/s10792-015-0048-8

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  • DOI: https://doi.org/10.1007/s10792-015-0048-8

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