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  • Title: Characteristics of olfactory dysfunction in patients with temporal lobe epilepsy.
    Author: Motoki A, Akamatsu N, Fumuro T, Miyoshi A, Tanaka H, Hagiwara K, Ohara S, Kamada T, Shigeto H, Murai H.
    Journal: Epilepsy Behav; 2021 Dec; 125():108402. PubMed ID: 34775249.
    Abstract:
    OBJECTIVE: To determine the characteristics of olfactory dysfunction in patients with temporal lobe epilepsy (TLE). METHODS: Odor identification was assessed using the odor stick identification test for Japanese (OSIT-J, full score 12 points) in 65 patients with TLE and in 74 controls. RESULTS: The mean OSIT-J score was significantly lower in patients with TLE (mean ± SD = 8.1 ± 2.8; median = 9) than in the control subjects (mean ± SD = 10.6 ± 1.1; median = 11) (P < 0.005). Olfactory dysfunction (hyposmia/anosmia) was associated with bilateral seizure foci and older age of onset in TLE. Patients who underwent temporal lobectomy for hippocampal sclerosis did not show significant decline after long-term recovery. The Indian ink part of OSIT-J was useful for the detection of olfactory deficits in patients with TLE (sensitivity = 47%, specificity = 93%). Patients with TLE tended to have preserved olfactory ability for stimulating odors and for familiar odors of daily life. SIGNIFICANCE: We observed characteristic odor identification deficits for individual odors used in OSIT-J. Our study findings provide deeper insight into the underlying mechanism of olfactory function in patients with TLE and may be beneficial in the clinical management of these patients.
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