Role of the intact hemisphere in determining the rehabilitation potential in the acute period of ischemic stroke: a diffusion and perfusion model

Fractional anisotropy (FA) estimated using diffusion tensor magnetic resonance imaging (dMRI) is considered as a promising biomarker in ischemic stroke (IS). The basis of this study is the assumption that the assessment of FA indices for different white matter tracts will be able to predict the main aspects of the rehabilitation potential even without determining the structural and functional bases of these influences.Objective: to study the diagnostic significance of changes in FA indices to assess various aspects of the rehabilitation potential in acute IS.Patients and methods. Examinations were made in 100 patients with IS and in 10 individuals without stroke and cognitive impairment. All the patients underwent dMRI and assessments of rehabilitation potential indicators on days 3 and 10 of the disease and at discharge.Results and discussion. The indices of FA of the ipsilateral upper longitudinal and cingulum bundles, FA and the size of an infarct focus, asymmetry of FA of the cingulum bundle (rFA), corticospinal tract (at the level of the knee of the internal capsule and bridge) and the anterior limb of the internal capsule, as well as the FA of the splenium and knee of the internal capsule of the intact hemisphere are of the most value for the functional outcome of acute IS. The microstructure of these zones determines the state of most rehabilitation domains. With respect to global outcome, the integrity of the associative tracts of the affected hemisphere is more valuable than the microstructure of the intact hemisphere and rFA. The tracts of the intact hemisphere are of particular importance for the restoration of complex rehabilitation spheres, such as cognitive status and daily living and social skills, which is necessary to ensure patient independence.Conclusion. The FA indices of the tracts under study seem to be a clinically acceptable biomarker of various aspects of the rehabilitation potential in acute IS.

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Role of cerebral reserve assessed using diffusion-weighted magnetic resonance imaging in determining the rehabilitation potential of acute ischemic stroke

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Дробаха

Sobyanin

et al. 2019

RJTAO

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Possibilities of diff usion-weighted magnetic resonance imaging in determining the rehabilitation potential of the acute period of ischemic stroke

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Дробаха

Собянин

et al. 2021

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Studies over the past decade demonstrate the high potential of diff usion-weighted MRI (dMRI) as a modern technique for non-invasive quantitative assessment of the microstructural integrity of the white matter of the brain, which allows predicting some aspects of the rehabilitation potential. Purpose of the study: to calculate the threshold values of fractional anisotropy (FA) of some cerebral tracts, which are informative in determining various aspects of the rehabilitation potential in the acute period of ischemic stroke. Patients and methods. We examined 100 patients with ischemic stroke and 10 persons without stroke and cognitive impairment. All patients underwent dMRI and clinical assessment of indicators of rehabilitation potential at discharge. Results. The NIHSS at discharge is associated with the size of infarction, the FA of the anterior, posterior leg and knee of the internal capsule, the superior longitudinal, cingular and inferior fronto-occipital bundles. Similar associations were noted for the Rivermead mobility index and the Rankin scale. The function of the hand according to the Frenchay scale is associated with the size of the lesion, FA of the anterior leg of the internal capsule, superior longitudinal, inferior fronto-occipital and cingular bundles. The MoCA is interrelated only with the size of the infarction and the FA of the anterior leg of the internal capsule, the Berg scale — with the size of the lesion and the FA of the upper longitudinal bundle, the FIM scale — with the FA of the upper longitudinal, inferior fronto-occipital and cingular bundles. The threshold values of FA of the cerebral tracts which are most informative in determining various aspects of the rehabilitation potential in the acute period of ischemic stroke were determined. Conclusion. The quantitative assessment of the FA of the main projection and associative tracts is informative in relation to the determination of the rehabilitation potential in the acute period of ischemic stroke.

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Role of the intact hemisphere in determining the rehabilitation potential in the acute period of ischemic stroke: a diffusion and perfusion model

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Role of cerebral reserve assessed using diffusion-weighted magnetic resonance imaging in determining the rehabilitation potential of acute ischemic stroke

Role of cerebral reserve assessed using diffusion-weighted magnetic resonance imaging in determining the rehabilitation potential of acute ischemic stroke

Possibilities of diff usion-weighted magnetic resonance imaging in determining the rehabilitation potential of the acute period of ischemic stroke

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