Document Detail

Late-onset multiple sclerosis in Isfahan, Iran.
MedLine Citation:
PMID:  23020533     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Multiple sclerosis (MS) typically affects young adults; however, the first symptoms can occur after age 50 and is classified as late-onset MS (LOMS). 
METHODS: In this retrospective study, we extracted the records of 3522 MS patients (2716 females and 806 males) registered in the Isfahan MS Society (IMSS) from 2003 to 2010. Next, we searched for LOMS cases. We aimed to compare these cases with 1698 non-LOMS subjects also extracted from the IMSS database.
RESULTS: We found 48 LOMS patients (28 females and 20 males), which gave a crude frequency of 1.36%. The frequency by sex of LOMS in males (2.4%) was significantly greater than in females (1.0%, P = 0.002). The mean age at onset was 55.1 ± 4.3 years. The female to male ratio of 1.4:1 in these patients was significantly lower than in non-LOMS subjects (3.37:1, P = 0.003). The leading pattern of MS was relapsing-remitting (RR) in 62.5%, followed by primary progressive (PP) in 27.1%, and secondary progressive (SP) in 10.4%. Predominant presenting symptoms and signs were motor disturbances (35.4%), followed by brainstem (25%), optic neuritis (22.9%), and sensory related deficits (18.7%). The mean progression index (PI) in LOMS patients (0.88 ± 0.48) was significantly higher than in non-LOMS cases, 0.37 ± 0.17 (P < 0.0001).
DISCUSSION: In comparing LOMS patients with the non-LOMS cohort, there was a higher frequency of the PP pattern and a higher PI in the LOMS group. In comparing other high-risk populations with the Isfahan cohort, LOMS formed a lower percentage of the total Isfahan MS population.
Masoud Etemadifar; Seyed-Hossein Abtahi; Alireza Minagar; Mojtaba Akbari; Ali Masaeli; Nasim Tabrizi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of Iranian medicine     Volume:  15     ISSN:  1735-3947     ISO Abbreviation:  Arch Iran Med     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-01     Completed Date:  2013-02-04     Revised Date:  2013-05-15    
Medline Journal Info:
Nlm Unique ID:  100889644     Medline TA:  Arch Iran Med     Country:  Iran    
Other Details:
Languages:  eng     Pagination:  596-8     Citation Subset:  IM    
Medical School, Isfahan University of Medical Sciences, Isfahan, Iran.
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MeSH Terms
Age Factors
Chi-Square Distribution
Disease Progression
Iran / epidemiology
Middle Aged
Multiple Sclerosis / epidemiology*
Retrospective Studies
Sex Factors

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