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Multiple sclerosis--more than one disease?

J P Larsen, G Kvaale, T Riise

    Acta Neurologica Scandinavica
    |August 1, 1985
    PubMed
    Summary
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    Multiple sclerosis (MS) incidence is rising in Western Norway, driven by increases in remittent and progressive forms. Chronic progressive MS incidence remains stable, suggesting distinct etiologies for different MS subtypes.

    Area of Science:

    • Neurology
    • Epidemiology
    • Clinical Medicine

    Background:

    • Previous studies indicated a rise in multiple sclerosis (MS) prevalence and incidence in Hordaland, Western Norway.
    • Understanding epidemiological trends is crucial for managing MS patient populations.

    Purpose of the Study:

    • To analyze the changes in MS incidence over a 30-year period in Hordaland.
    • To investigate whether specific MS subtypes contribute differently to observed incidence trends.
    • To explore potential differences in symptomatology and age at onset between MS subtypes.

    Main Methods:

    • Retrospective epidemiological analysis of MS cases in Hordaland over 30 years.
    • Stratification of incidence data by MS subtype: remittent, remittent/progressive, and chronic progressive.

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  • Comparison of clinical characteristics (symptomatology, age at onset) between MS subtypes.

    • Main Results:

    • The overall increase in MS incidence is attributed to a rise in remittent and remittent/progressive MS.
    • The incidence of the chronic progressive form of MS has remained stable over the 30-year study period.
    • Significant variations in symptomatology and age at onset were observed between the remitting and progressive MS forms.

    Conclusions:

    • The epidemiological and clinical divergence suggests at least two distinct forms of MS.
    • Remitting and chronic progressive MS may have different underlying etiological factors.
    • Further research into the distinct etiologies of MS subtypes is warranted.