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Anti-aquaporin-4 IgG in Patients Presenting with Unilateral Optic Neuritis: A Cohort Study.
MedLine Citation:
PMID:  23024849     Owner:  NLM     Status:  PubMed-not-MEDLINE    
BACKGROUND: Optic neuritis (ON) can be the first presentation of multiple sclerosis (MS) or neuromyelitis optica (NMO). Anti-aquaporin-4 IgG (AQP4 IgG) is a highly specific and moderately sensitive biomarker for NMO. This study was designed to assess the rate of seropositivity for AQP4 IgG, and the short-term outcome of patients presenting with single isolated ON (SION).
METHODS: A cohort of 41 consecutive patients experiencing severe (< 20 / 200) SION (not fulfilling the diagnostic criteria for MS or NMO), was prospectively recruited. Blood sampling was carried out immediately after the diagnosis of ON, and AQP4 IgG was tested qualitatively, using an indirect immunofluorescence kit. After clinical and paraclinical investigations, all the patients were followed up for a short-term period of at least 18 months.
RESULTS: The seroprevalence among the initial ON patients was 9.7% (4 / 41). The short-term conversion rate to MS and NMO was estimated to be about 7.3 and 4.9%, respectively. The conversion rate to NMO in initially seropositive patients was greater than that for the whole cohort [2 / 4 (50%) vs. 2 / 41 (4.9%); P = 0.035; Odds ratio: 19.5, 95% confidence interval: 1.73 to 219.50].
CONCLUSION: AQP4 IgG seropositive SION patients were more likely to develop NMO in comparison to the total SION population. Further studies, with a longer follow-up period and larger sample sizes are warranted to assess the clinical and prognostic value of assessing AQP4 IgG in SION.
Masoud Etemadifar; Mohammad-Ali Abtahi; Hassan Razmjoo; Seyed-Hossein Abtahi; Ali-Reza Dehghani; Zahra-Alsadat Abtahi; Mojtaba Akbari; Shahir Mazaheri; Amir-Hadi Maghzi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of preventive medicine     Volume:  3     ISSN:  2008-8213     ISO Abbreviation:  Int J Prev Med     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-10-01     Completed Date:  2012-10-02     Revised Date:  2013-05-30    
Medline Journal Info:
Nlm Unique ID:  101535380     Medline TA:  Int J Prev Med     Country:  Iran    
Other Details:
Languages:  eng     Pagination:  612-5     Citation Subset:  -    
Isfahan Research Committee of Multiple Sclerosis (IRCOMS), Isfahan, Iran, ; Medical School, Isfahan University of Medical Sciences, Isfahan, Iran.
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