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Olfaction in multiple sclerosis. With a note on the discrepancy between optic and olfactory involvement.

K A Ansari

    European Neurology
    |January 1, 1976
    PubMed
    Summary
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    This study found no difference in olfactory acuity between multiple sclerosis (MS) patients and controls, suggesting olfactory pathways may be spared in MS. Further research is needed to understand this finding.

    Area of Science:

    • Neuroscience
    • Neurology
    • Olfactory Research

    Background:

    • Multiple sclerosis (MS) is a demyelinating disease affecting the central nervous system.
    • Olfactory dysfunction has been reported in some MS patients, but findings are inconsistent.

    Purpose of the Study:

    • To investigate olfactory acuity in patients with multiple sclerosis (MS).
    • To compare olfactory thresholds between MS patients and healthy controls.
    • To explore correlations between olfactory function, optic involvement, and disability in MS.

    Main Methods:

    • A double-blind study using serial binary dilutions of amyl acetate and nitrobenzene.
    • Olfactory acuity was determined for 40 MS patients and 24 age- and sex-matched controls.
    • Methodological reproducibility was confirmed through repeated measurements on 18 patients.

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    Main Results:

    • No significant difference was found in the mean olfactory threshold between MS patients and controls.
    • Olfactory threshold in MS patients did not correlate with optic nerve involvement or the degree of disability.
    • Findings contradict some previous reports of olfactory dysfunction in MS.

    Conclusions:

    • Olfactory pathways may be relatively spared in multiple sclerosis compared to other central nervous system pathways.
    • The sparing of olfactory tracts might be linked to their lower basic protein content.
    • Further investigation is needed to understand the disparity in involvement between olfactory and optic systems in MS.