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UkraineNeuroGlobal


UkraineNeuroGlobal

Международный неврологический журнал Том 16, №3, 2020

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Клінічні синдроми таламічних інсультів нижньолатеральної судинної території: проспективне клінічне когортне дослідження

Авторы: S.M. Vinychuk(1), M.M. Prokopiv(2), L.M. Trepet(1), O.Ye. Fartushna(3)
(1) — Oleksandrivska Clinical Hospital, Kyiv, Ukraine
(2) — Bogomolets National Medical University, Kyiv, Ukraine
(3) — Ukrainian Military Medical Academy, Kyiv, Ukraine

Рубрики: Неврология

Разделы: Клинические исследования

Версия для печати


Резюме

Актуальність. У статті проаналізовано i описано патофізіологічні особливості й закономірності виникнення неврологічних, нейропсихологічних та клінічних судинних синдромів таламічних інсультів нижньoлатерального судинного басейну. Мета дослідження: описати i проаналізувати клініко-нейровізуалізаційні особливості судинних синдромів таламічних інсультів нижньолатеральної судинної території в проспективному клінічному когортному дослідженні. Матеріали та методи. Ми провели проспективне клінічне когортне дослідження 319 пацієнтів iз гострим інсультом, які надійшли до неврологічного центру Олександрівської клінічної лікарні (м. Київ, Україна) протягом перших 24 годин з моменту розвитку інсульту. Усі пацієнти пройшли комплексне клініко-неврологічне, лабораторне, ультразвукове і ней-ровізуалізаційне обстеження. Результати. Серед 319 хворих iз гострим інсультом нейровізуалізаційно підтверджений таламічний інсульт діагностовано в 34 (10,6 %) пацієнтів. Iз них у 22 осіб (середній вік 61,9 ± 10,2 року) виявлено гострий ізольований інфаркт таламуса, а в 12 (середній вік 59,0 ± 9,6 року) — гострий таламічний крововилив. Проаналізовані, порівняні та описані специфічні неврологічні особливості клінічних судинних синдромів гострих таламічних інсультів нижньолатеральної судинної території.

Актуальность. В статье проанализированы и описаны патофизиологические особенности и закономерности возникновения неврологических, нейропсихологических и клинических сосудистых синдромов таламических инсультов нижнелатерального сосудистого бассейна. Цель исследования: описать и проанализировать клинико-нейровизуализационные особенности сосудистых синдромов таламических инсультов нижнелатеральной сосудистой территории в проспективном клиническом когортном исследовании. Материалы и методы. Мы провели проспективное клиническое когортное исследование 319 пациентов с острым инсультом, поступивших в неврологический центр Александровской клинической больницы (г. Киев, Украина) в течение первых 24 часов с момента развития инсульта. Все пациенты прошли комплексное клинико-неврологическое, лабораторное, ультразвуковое и нейровизуализационное обследования. Результаты. Среди 319 больных с острым инсультом нейровизуализационно подтвержденный таламический инсульт диагностирован у 34 (10,6 %) пациентов. Из них у 22 человек (средний возраст 61,9 ± 10,2 года) обнаружен острый изолированный инфаркт таламуса, а у 12 (средний возраст 59,0 ± 9,6 года) — острое таламическое кровоизлияние. Проанализированы, сравнены и описаны специфические неврологические особенности клинических сосудистых синдромов острых таламических инсультов нижнелатеральной сосудистой территории.

Background. The article covers pathophysiological features and patterns of the occurrence of neurological, neuropsychological, and clinical vascular syndromes of thalamic strokes in the lower lateral vascular territory. The purpose of this study is to determine the features of clinical vascular syndromes of an acute thalamic stroke in the lower lateral vascular territory in a prospective hospital-based cohort study, providing a comprehensive clinical and neuroimaging analysis. Materials and methods. We have prospectively recruited 319 acute stroke patients, admitted within 24 hours from the onset of the stroke symptoms to the Neurological Center at an academic hospital (Oleksandrivska Clinical Hospital) in Kyiv, Ukraine. Comprehensive neurological, clinical, laboratory, ultrasound, and neuroimaging examinations were performed to all patients. Results. MRI/CT-proven thalamic stroke was diagnosed in 34 (10.6 %) of 319 patients, forming a study group. Twenty-two of 34 patients (average age 61.9 ± 10.2 years) were diagnosed with an acute isolated ischemic thalamic infarction, and 12 people (average age 59.0 ± 9.6 years) had an acute thalamic hemorrhage. Specific neurological features of clinical vascular syndromes of acute thalamic strokes in the lower lateral vascular territory were analyzed, compared, and described.


Ключевые слова

таламус; інсульт; таламічний інсульт; клінічні особливості; синдром; судинна територія; нижньолатеральна судинна територія

таламус; инсульт; таламический инсульт; клинические особенности; синдром; сосудистая территория; нижнелатеральная сосудистая территория

thalamus; stroke; thalamic stroke; clinical features; syndrome; vascular territory; lower lateral vascular territory

Introduction

Worldwide, stroke is one of the leading global causes of death, long-term, and permanent disability [1–17]. Someone has a stroke every 40 seconds on average, and someone died of stroke every 3 minutes 42 seconds [10, 18, 19]. In addition, more young people are affected by stroke in low- and middle-income countries. Eastern Europe, East Asia, and parts of Southeast Asia, Central Asia, and sub-Saharan Africa had the highest rates of stroke mortality. Age-standardized prevalence rates of stroke were higher in Eastern Europe and East Asia [8, 20–22]. Thalamic strokes, both alone and in combination with strokes involving other structures, are not rare, accounting for approximately 11 to 23–25 % of all posterior circulation strokes, especially in combination with damage to other structures [23–25].
The thalamus manages our sensitivity to temperature, light, and physical touch. It controls the flow of visual, auditory, and motor information. The thalamus is also involved in aspects of learning, memory, speech, language understanding, motivation, attention and wakefulness, being in charge of our sense of balance and awareness of our arms and legs. It controls how we experience pain, even emotional experiences, expressions, and our personalities involve the thalamus. Neurological and neuropsychological symptoms of thalamic strokes are invariably investigated by medical doctors during an objective examination of the patient, being an integral part of establishing a syndromological, topical, and clinical diagnosis.
However, currently, there are not enough published prospective hospital-based cohort studies that report and analyze pathophysiological features and patterns of the occurrence of neurological, neuropsychological, and clinical vascular syndromes of thalamic strokes in the lower lateral vascular territory, and their topical diagnosis using clinical, neurological, and neuroimaging methods in a prospective hospital-based cohort study [25–31].
The determination of vascular thalamic syndrome allows solving two main issues: the presence of damage to a specific vascular territory and a topical diagnosis of the central nervous system damage (thalamic stroke) [30]. Given all this, we performed a comprehensive clinical and neuroimaging analysis of the treatment results and assessed the outcome of the disease in 34 patients with thalamic stroke, among whom 22 people had an isolated thalamic infarction and 12 — he-morrhage in the thalamus.
The purpose of this study is to describe and analyze the clinical and neuroimaging features of vascular syndromes of thalamic strokes in the lower lateral vascular territory in a prospective hospital-based cohort study, providing a comprehensive clinical and neuroimaging analysis.

Materials and methods

The materials and methods of this prospective hospital-based cohort study of acute ischemic stroke patients were reported previously [29–31, 46]. In brief, only patients with MRI/CT-proven thalamic stroke aged 18 years or older formed a study group.
All study participants were admitted to the Neurological Center of Oleksandrivska Clinical Hospital (Kyiv, Ukraine) that consists of an admission department, clinical department of neurology, department of cerebrovascular pathology with intensive care/stroke unit, and a research department of neurology. Patients were admitted to the hospital within the first 24 h since the first stroke symptoms occurred. All stroke cases were reviewed by at least two board-certified neurologists with training in cerebrovascular diseases. Clinical history, 12-lead electrocardiogram, blood testing, carotid ultrasound, head computed tomography (CT) and/or brain magnetic resonance imaging (MRI) were obtained for all study participants. Stroke was defined according to criteria of the World Health Organization, American Heart Association/Ame-rican Stroke Association guidelines for adult stroke, and was confirmed by neuroimaging [32, 33]. The etiology of stroke was classified according to the TOAST criteria [34]. The National Institutes of Health Stroke Scale, the Modified Rankin Scale, the Barthel index, and the Charlson Comorbidity Index were determined for all participants. Secondary stroke prevention was prescribed according to the American Heart Association/American Stroke Association and the European Stroke Organisation guidelines immediately after the stroke diagnosis was made [35–41]. Stroke education programs were provided to all study participants [11, 16, 30, 42–45].
Parametric and non-parametric statistic methods were applied. The log-rank test was used for univariate comparisons of event-free survival between groups. A two-sided p < 0.05 was considered significant for all analyses. All statistical analyses were performed using IBM SPSS Statistics Version 22.

Results and discussion

In total, 319 adult patients with an acute MRI/CT-proven stroke were screened from 2001 to 2011. Among them, 204 (63.9 %) individuals were diagnosed with an acute posterior circulation ischemic stroke, and 115 (36.1 %) had an intracerebral hemorrhage. A thalamic stroke was diagnosed in 34 (10.6 %) of 319 patients, forming a study group: 22 of them (12 men, 10 women aged 50–84 years; average age 61.9 ± 10.2 years) were diagnosed with an acute isolated thalamic stroke, and in the rest 12 patients (5 men, 7 women aged 57–75 years; average age 59.0 ± 9.6 years), a thalamic hemorrhage was detected (Fig. 1).
An isolated stroke in the lower lateral thalamic vascular territory manifested itself in heterolateral hemihypesthesia (in relation to the superficial types of sensitivity) and contralateral hemiataxia. Sensitivity impairments are often combined with impaired motor skills due to damage to the tissue of the internal capsule adjacent to the stroke foci, which determines the development of the sensorimotor syndrome.
In patients with extensive lower lateral thalamic stroke, the classic thalamic Dejerine-Roussy syndrome or thalamic pain syndrome occurs that is characterized by moderate contralateral hemiparesis, hemihypesthesia, hemiataxia, hemialgia, paresthesia, as well as dysesthesia (perversion of the perception of sensitive irritations). This syndrome was first described in detail by the French neurologist Joseph Jules Dejerine and his student Gustave Roussy in 1906. Thalamic syndrome was revealed in two patients with an extensive ischemic stroke of the lower lateral territory, being characterized by the following clinical manifestations: moderate transient hemiparesis on the side opposite to the lesion without signs of muscle spasticity, severe hemihy-pesthesia, hemiataxia, pain and paresthesia after a stroke in the distal extremities, often extending to the entire half of the body, — hemialgia.
In patients with extensive lesions in the lower lateral vascular territory of the thalamus, a dynamic contracture of the fingers can occur in the side opposite to a stroke, so-called classic thalamic arm (main thalamique) that is described as follows: the forearm is bent and pronated, the wrist joint is bent, the proximal phalanges of the fingers are moderately bent, while the middle and distal phalanges are fully extended. The fingers of the hand are in continuous motion — it is hyperkinesis of the choreoathetoid type [30]. The described clinical syndrome occurs as a result of damage to the ventral posterior and ventral lateral thalamic nucleus with the spread of the infarction focus to the internal capsule. Pain and dysesthesia that are typical for Dejerine-Roussy syndrome give a reason to believe that at the level of specific nuclei of the thalamus, there is not just a switching of impulses for further transmission to the cerebral cortex, but the primary processing of information is carried out with the formation of primitive sensations. With a stroke in the lower lateral thalamic territory, foci of excitation arise that, along with the participation of association nuclei, causes the appearance of non-localized, diffuse burning (protopathic) pains, paresthesia.
Neurological symptoms in patients with stroke of the lower lateral thalamic territory can mimic symptoms of ischemic stroke with capsular localization of the lesion (carotid arterial systems). Thalamic pain with all signs of hyperpathia, emotional and autonomic manifestations is pathognomonic for thalamic stroke. In clinical practice, thalamic syndrome is associated with hemianesthesia, hemiataxia, and hemianopsia even though these symptoms are not pathognomonic for thalamic stroke. In addition to the sensitive ones, it is important to consider the presence of hemialgia, paresthesia, psychosensory impairment (hallucinosis), choreoathetoid hyperkinesis, dystonic manifestations with a tendency to contractures of a dynamic type, and emotional central paresis of facial muscles. In all patients with infarction of the lower lateral thalamic territory, varying degrees of impaired cognitive status were present. The most significant cognitive impairment was in patients with Dejerine-Roussy syndrome.
In our study, 9 (40.9 %) of 22 patients developed an isolated thalamic stroke that was localized in the lower lateral classical territory that is vascularized by the lower lateral, or thalamogeniculate, arteries. The main clinical manifestation in all patients was impaired surface sensitivity of varying degrees on the contralateral half of the body. Hemihypesthesia in 6 (66.7 %) people was combined with bathyhypesthesia and contralateral hemiataxia. In 7 (77.8 %) patients, the infarcted lesion spread to the adjacent internal capsule, causing the development of the sensorimotor syndrome on the side opposite to the lesion. At the same time, in 2 individuals, motor disorders were preceded by sensitivity disorders (sensorimotor stroke), in the rest 5 patients, motor and sensory disorders coincided in time. In 4 patients with left-sided lesions of the lower lateral area of the thalamus, the emotional sphere disorders of varying severity and various manifestations of dysthymia (longing, apathy, fear) were noted.
The most common causes of a thalamic stroke in the lower lateral territory were microangiopathies in patients with arterial hypertension and hypercholestero-lemia (n = 5), diabetes mellitus (n = 2), cardioembolism (n = 2).

Conclusions

Isolated stroke of the lower lateral thalamic vascular territory manifested itself in a syndrome of heterolateral hemianesthesia, hemiataxia, combined with impaired motor skills, the presence of pain, autonomic disorders with signs of hyperpathia, cognitive deficit; a specific sign is the development of Dejerine-Roussy syndrome; with an extensive lesions in the contralateral side, a dynamic contracture of the fingers can occur — the classic thalamic arm (main thalamique); the spread of a stroke to the adjacent inner capsule causes the development of sensorimotor syndrome.
Conflicts of interests. Authors declare the absence of any conflicts of interests and their own financial interest that might be construed to influence the results or interpretation of their manuscript.
Additional information
Role of the funding source — none
Disclosures — none
Author contributions
S.M. Vinychuk — study concept and design, statistical analysis, interpretation of data, literature overview, critical revision of the manuscript for important intellectual content; M.M. Prokopiv — study concept and design, data acquisition, statistical analysis, interpretation of data, literature overview, critical revision of the manuscript for important intellectual content; L.M. Trepet — study design, data acquisition, statistical analysis, interpretation of data; O.Ye. Fartushna — study concept and design, literature overview, statistical analysis, interpretation of data, article concept and design, drafting the article, critical revision of the manuscript for important intellectual content.

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