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• W3043374188 abstract "Previous studies investigating associations between white matter alterations and duration of temporal lobe epilepsy (TLE) have shown differing results, and were typically limited to univariate analyses of tracts in isolation. In this study we apply a multivariate measure (the Mahalanobis distance), to capture the distinct ways white matter may differ in individual patients, and relate this to epilepsy duration. Diffusion MRI, from a cohort of 94 subjects (28 healthy controls, 33 left-TLE and 33 right-TLE), was used to assess associations between tract fractional anisotropy (FA) and epilepsy duration. Using ten white matter tracts, we analysed associations using traditional univariate analyses (z-scores) and a complementary multivariate approach (Mahalanobis distance), incorporating multiple white matter tracts into a single unified analysis. In patients with right-TLE, FA was not significantly associated with epilepsy duration for any tract studied in isolation. In patients with left-TLE, the FA of two limbic tracts (ipsilateral fornix, contralateral cingulum gyrus) was significantly negatively associated with epilepsy duration (Bonferonni corrected p<0.05). Using a multivariate approach we found significant ipsilateral positive associations with duration in both left, and right-TLE cohorts (left-TLE: Spearman's rho=0.487, right-TLE: Spearman's rho=0.422). Extrapolating our multivariate results to duration equals zero (i.e. at onset) we found no significant difference between patients and controls. Associations using the multivariate approach were more robust than univariate methods. The multivariate distance measure provides non-overlapping and more robust results than traditional univariate analyses. Future studies should consider adopting both frameworks into their analysis in order to ascertain a more complete understanding of epilepsy progression, regardless of laterality." @default.
• W3043374188 created "2020-07-23" @default.
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• W3043374188 date "2020-07-15" @default.
• W3043374188 modified "2023-09-27" @default.
• W3043374188 title "Multivariate white matter alterations are associated with epilepsy duration" @default.
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