Clinical Neuroscience

[Clinical neurophysiological methods in diagnosis and treatment of cerebrovascular diseases]

NAGY Ildikó, FABÓ Dániel

JANUARY 30, 2018

Clinical Neuroscience - 2018;71(01-02)


[Neurophysiological methods are gaining ground in the diagnosis and therapy of cerebrovascular disease. While the role of the EEG (electroencephalography) in the diagnosis of post-stroke epilepsy is constant, quantitative EEG para-meters, as new indicators of early efficiency after thrombolysis or in prognosis of patient’s condition have proved their effectiveness in several clinical studies. In intensive care units, continuous EEG monitoring of critically ill patients became part of neurointenzive care protocols. SSEP (somatosesnsory evoked potencial) and EEG performed during carotid endarterectomy, are early indicative intraoperativ neuromonitoring methods of poor outcome. Neurorehabilitation is a newly discovered area of neurophysiology. Clinical studies have demonstrated the effectiveness of repetitive transcranial magnetic stimulation (rTMS) in the rehabilitation of stroke patients. Brain computer interface mark the onset of modern rehabi-litation, where the function deficit is replaced by robotic tehnology. ]



Further articles in this publication

Clinical Neuroscience

Association of cardiovascular risk factors and Parkinson’s disease - case-control study in South East Hungary


Aims - Parkinson’s disease (PD) has the second highest incidence among neurodegenerative diseases in the world population. The study aimed to investigate the presence of some cardiovascular risk factors - dyslipidemia, diabetes, and hypertension - in PD patients and to compare their risk with non-PD population in South East Hungary. Methods - A case-control study was conducted at the Department of Neurology, University of Szeged, Hungary. The study included 1299 subjects out of which 620 patients were identified as cases of diagnosed PD and 679 as controls. Logistic regression analyses were conducted to reveal the association of vascular risk factors with PD. Results - In the univariate analysis, diabetes mellitus was positively associated with PD, while dyslipidemia showed negative association to it in the total population, and no significant associations were found between hypertension and PD. The multivariate logistic regression models showed that the odds of diabetes mellitus was higher (OR=2.86), while the odds of dyslipidemia was lower (OR=0.58) among PD patients than in the control group. Hypertension showed a different pattern by gender: the odds of registered hypertension was significantly lower in female PD patients (OR=0.68), whereas the result was not significant in males. Conclusions - This is the first study that provides a comprehensive view of the cardiovascular risk factors in PD patients in Hungary and shows considerable relationship between diabetes mellitus and PD.

Clinical Neuroscience

Insights into the structure and function of the hippocampal formation: Relevance to Parkinson’s disease

GYÖRFI Orsolya, NAGY Helga, BOKOR Magdolna, KÉRI Szabolcs

The link between the hippocampus and declarative memory dysfunctions following the removal of the medial temporal lobe opened unexplored fields in neuroscience. In the first part of our review, we summarized current theoretical frameworks discussing the role of hippocampus in learning and memory. Several theories are highlighted suggesting that the hippocampus is responsible for assembling stimulus elements into a unitary representation that later can be utilized to simulate future events. The hippocampal formation has been implicated in a growing number of disorders, from neurodegenerative diseases to atypical cognitive ageing and depression. Recent neuroimaging studies provided new opportunities to study in detail the hippocampal formation’s role in higher levels of the nervous system. We will present data regarding the regional specialization of the hippocampus in experimental models developed for healthy and neurological conditions with a special focus on Parkinson’s disease. Combined evidence from neuroimaging studies suggested that hippocampal volume is reduced in non-demented, newly diagnosed patients with Parkinson’s disease, which is associated with impaired memory performance. These findings proposed that, beyond the well-known striatal dopamine loss, impaired hippocampal synaptic plasticity may contribute to cognitive and affective impairments in early Parkinson’s disease.

Clinical Neuroscience

Functional neurotoxicity and tissue metal levels in rats exposed subacutely to titanium dioxide nanoparticles via the airways

HORVÁTH Tamara, VEZÉR Tünde, KOZMA Gábor, PAPP András

Introduction and aims - Nanoparticles of titanium dioxide are suspected neurotoxic agents and have numerous applications possibly resulting in human exposure by several ways including inhalation. In the present work, rats were exposed to spherical TiO2 nanoparticles of two different sizes by the intratracheal route. It was investigated how the neuro-functional alterations, detected by electrophysiological and behavioral methods, were related to the concentration of Ti in the tissue samples and what the influence of the size of the NPs was. Materials and methods - Rats (young adult Wistar males, 10/group) were exposed to TiO2 nanoparticles of ca. 10 and 100 nm diameter (suspension medium: neutral PBS with 1% hydroxyethyl cellulose) by intratracheal instillation in 5 and 18 mg/kg b.w. dose; 5 days per week for 6 weeks. Controls were instilled with saline, and vehicle controls, with the suspension medium. To see general toxicity, body weight was checked daily, and organ weights were measured at the end of experiment. Grip strength test, to assess motor function damage, was done before and after the 6-week treatment. Finally, the rats were anesthetized with urethane, spontaneous cortical activity and sensory evoked potentials were recorded, then the rats were dissected and tissue samples were taken for Ti level measurement. Results - Body weight gain indicated no general toxicity, and no significant change in the relative organ weights, except that of the lungs, was seen. However, change of time-to-fall in the grip strength test, and latency of cortical evoked po­tentials, were altered in the treated groups, indicating functional damage. Correlation of these alterations with the cortical Ti level was dissimilar for the two sizes of nanoparticles. Conclusion - The results provided further support to the functional neurotoxicity of TiO2 nanoparticles. The exact role of particle size, and the mechanisms involved, remain to be elucidated.

Clinical Neuroscience

Alteration of mean platelet volume in the pathogenesis of acute ischemic stroke: cause or consequence?

AYAS Özözen Zeynep, CAN Ufuk

Introduction - Platelets have a crucial role on vascular disease which are involved in pathogenesis of ischemic stroke. Platelet size is measured as mean platelet volume (MPV) and is a marker of platelet activity. Platelets contain more dense granules as the size increases and produce more serotonin and tromboglobulin (b-TG) than small platelets. In this study, the alteration of MPV values were investigated in patients with acute stroke, who had MPV values before stroke, during acute ischemic stroke and 7 days after the stroke. The relationship between this alteration and risk factors, etiology and localization of ischemic stroke were also investigated. Methods - Sixty-seven patients with clinically and radiologically established diagnoses of ischemic stroke were enrolled into the study and stroke etiology was classified by modified Trial of Org 10 172 in Acute Stroke Treatment (TOAST) classification and, modified Bamford classification was used for localization and stroke risk factors were also evaluated. The platelet counts and MPV values from patient files in patients who had values before stroke (at examination for another diseases), within 24 hours of symptom onset and after 7 further days were analysed. Results - MPV values increased after stroke (10.59±2.26) compared with acute stroke values (9.84±1.64) and the values before stroke (9.59±1.72) (p<0.0001); this alteration of MPV values occured 7 days after stroke (p<0.016). There was a positive correlation between age and MPV values during acute stroke (r=0.270; p<0.05). Patients with atrial fibrillation had higher alteration in the time of MPV compared with patients without atrial fibrillation (p>0.006). We assessed for gender, men (n=38) had a higher alteration in the time of MPV compared with women (n=29) (p=0.013). Conclusion - Although there was no alteration of platelet counts, MPV values were increased 7 days after stroke in patients with acute ischemic stroke.

Clinical Neuroscience

[The facets of creativity in the light of bipolar mood alterations]


[The link between creativity, as the highest expression form of human achievement, and bipolar disorder came into focus of scientific investigations and research. Accomplished writers, composers and visual artists show a substantially higher rate of affective disorders, prodominantly bipolar mood disorders, comparing to the general population. Then again, patients afflicted with bipolar II subtype (hypomania and depression), as well as persons presenting the mildest form of bipolar mood swings (cyclothymia) possess higher creative skills. It evokes therefore that certain forms and mood states of bipolar disorder, notably hypomania might convey cognitive, emotional/affective, and motivational benefits to creativity. The aim of this paper is to display expression forms of creativity (writing, visual art, scientific work) as well as productivity (literary and scientific work output, number of artworks and exhibitions, awards) in the light of clinically diagnosed mood states at an eminent creative individual, treated for bipolar II disorder. Analysing the affective states, we found a striking relation between hypomanic episodes and visual artistic creativity and achievement, as well as scientific performance, whereas mild-moderate depressed mood promoted literary work. Severe depression and mixed states were not associated with creative activities, and intriguingly, long-term stabilised euthymic mood, exempted from marked affective lability, is disadvantageous regarding creativity. It seems, thereby, that mood functions as a sluice of creativity. Nevertheless, it is likely that there is a complex interaction between bipolar mood disorder spectrum and psychological factors promoting creativity, influenced also by individual variability due to medication, comorbid conditions, and course of disorder.]

All articles in the issue

Related contents

Clinical Neuroscience

[Vinpocetin in neurological diseases]

SZAPÁRY László, KÉSMÁRKY Gábor, TÓTH Kálmán, MISNYOVSZKY Melinda, TÓTH Tímea, BALOGH Ágnes, NAGY Krisztián, NÉMETH György, FEHÉR Gergely

[Introduction - Stroke is the third leading cause of death worldwide (following cardiovascular and cancer mortality) and associated with serious disability for the vast majority of patients. There is no salvage therapy for irreversibly damaged brain areas, improving the circulation of the surrounding hypoperfused territories may be associated with benefitial clinical states. Cerebral hypoperfusion may play a role in the pathogenesis of other kind of neurological diseases, improvement of global circulation may have a preventive effect on these conditions. Aims - The aim of our study was to review the experimental and clinical articles focusing on the role of vinpocetin in different neurological conditions. Results - Vinpocetin appears to have several different mechanisms of action that allow for its antiinflammatory, antioxidant, vasodilating, antiepileptic and neuroprotective activities in experimental conditions. On the other hand, several meta-analysis of the existing studies in acute stroke examining short and long term fatality rates with vinpocetin was unable to assess efficacy. In chronic cerebrovascular patients, vinpocetin improves impaired hemorheological variables, has significant vasodilating properties, improves endothelial dysfunction, neuroimaging studies showed selective increase in cerebral blood flow and cerebral metabolic rate, all of which are potentially beneficial in cerebrovascular disease and may improve cognitive functions. Summary - Based on the above mentioned results vinpocetin plays an important role both in basic research and in clinical management of different neurological diseases.]

Clinical Neuroscience

[The diagnostic and management challenges for posterior reversible leucoencephalopathy syndrome]

KILIC COBAN Eda, GEZ Sedat, KARA Batuhan, SOYSAL Aysun

[Posterior reversible encephalopathy syndrome (PRES) is a clinicoradiological entity characterized by epileptic seizures, headaches, altered mental status and focal neurological signs. Hypertension is the second most common condition associated with PRES. The 50-year-old-male patient with right-sided hemiparesis and speech disturbances admitted to our clinic. His blood pressure at the emergency service was 220/140 mmHg. A left putaminal hematoma was seen in his CT and MRI. In his brain MRI, FLAIR and T2 –weighted sequences showed bilateral symmetric diffuse hyperintensities in the brain stem, basal ganglia, and occipital, parietal, frontal, and temporal lobes. After the intense antihypertensive drug treatment, his blood pressure came to normal limits within a week. During his hospitalisation he had a recurrent speech disturbance lasting an hour. His electroencephalography was normal. In his repeated diffusion weighted MRI, an acute lacunary infarct was seen on right centrum semiovale. Two months later, the control MRI showed only the previous lacuner infarcts and the chronic putaminal hematoma. We presented a case developping either a cerebral hemorrhage or a lacunar infarction due to PRES. The main reason of the following complications of the disease was delayed diagnosis. Uncontrolled hypertension was guilted for the events. ]

Clinical Neuroscience

[Organization of rehabilitation of people with disabilities as a consequence of neurological conditions in Hungary]

FAZEKAS Gábor, DÉNES Zoltán, FÁY Veronika, URBÁN Edina, SZÉL István

[The history of rehabilitation of people with disabilities as a consequence of neurological conditions goes back to more than four decades in Hungary. The authors describe its history, how this service is organized nowadays, questions of specialization, scientific activity and quality improvement. They emphasise: any form of neurorehabilitation service (special neurorehabilitation department or programme of a multiprofile rehabilitation unit) must meet the same criteria. Quality assurance will be provided by a new accreditation system.]

Clinical Neuroscience

Is stroke indeed a “Monday morning disease”?


Introduction - The therapeutic time window of acute stroke is short. Decision on the use of intravenous thrombolysis is based on well-defined criteria. Any delay in the transport to a designated stroke centre decreases the odds of therapeutic success. In Hungary, the admission rate of stroke patients peaks on Monday, the number gradually decreasing by the end of the week. This phenomenon has long been suggested to be due to the lack of emergency care approach. According to the literature, however, returning to work following a holiday is a risk factor for acute stroke. A similar phenomenon is well-known in veterinary medicine, a condition in horses referred to as ‘Monday morning disease’. In our study, we analysed the distribution of admissions due to acute stroke by the day of the week in 4 independent data sources. Patients and methods - The number of patients admitted to the Szent János Hospital, Budapest, Hungary with stroke and that of emergency ambulance transports in the whole city of Budapest due to acute stroke were analysed in the period between January 1 and March 31, 2009. The distribution of thrombolytic interventions reflecting hospitalizations for hyperacute stroke was analysed based on data of the Szent János Hospital in 2009-2012, and on national data from 2006-2012. Descriptive statistics was used to present the data. The variation between daily admission was compared by chi-square test. Results - The proportion of daily admission of stroke patients admitted to the Szent János Hospital was the highest at the beginning of the week (18% on Monday, and 21% on Tuesday) and the lowest on the weekend (9% and 9% on Saturday and Sunday, respectively). The distribution of ambulance transports in Budapest due to acute stroke tended to be similar (15% and 15% on Monday and Tuesday, whereas 13% and 12% on Saturday and Sunday, respectively) on different days of the week. No such Monday peak could be observed in a single centre regarding thrombolytic interventions: 18% and 19% of the total of 80 thrombolytic interventions in the Szent János Hospital were performed on Monday and Sunday, respectively. At the national level the higher Monday rate is obvious: during a 7-year period 16.0%, 12.7%, and 13.5% of all thrombolytic interventions in Hungary were performed on Monday, Saturday and Sunday, respectively. Conclusion - Monday preference of stroke is not exclusively caused by the lack of emergency care approach, and the phenomenon is not consistent at the individual hospital level in cases undergoing thrombolysis.

Lege Artis Medicinae


SZEGEDI Norbert, MAY Zsolt, ÓVÁRY Csaba

[Cerebrovascular diseases are third among the most frequent causes of mortality in developed countries and represent the most common cause of disability in adulthood. 80% of all acute stroke cases are of ischemic origin. The proven significant efficacy of intravenous thrombolysis with rt-PA in the NINDS rt-PA Stroke Trial was the cornerstone of the treatment of acute ischemic stroke, followed by several recommendations. From this time on, the attention shifted to early and appropriate recognition of symptoms and to organizing a quickly reacting emergency medical system in order to maximize the number of those patients transported immediately to the nearest stroke center to have the opportunity to be treated within three hours after their symptom onset. Specialized stroke facilities have documented benefit over other forms of stroke management concerning survival rates, but they need coordinated continuous multidisciplinary care for the patients, availability of CT scanner, laboratory examinations including tests of hemostasis, intensive care unit and well-trained stroke neurologists on 24-hours-a-day basis. Thrombolysis in these stroke centers with intravenous 0,9 mg/kg rt-PA improves the outcome of acute stroke with 30%. Although new guidelines strongly recommend the thrombolysis of selected ischemic stroke patients, the only evidence-based treatment of this condition has not yet become a part of the routine stroke management in Hungary. Regarding other specific antithrombotic therapeutic approaches, anticoagulation has the most contradictory status: in spite of well-defined theoretic considerations there are no evidence-based data in favour of routine anticoagulation in acute ischemic stroke, neither with heparin nor with low molecular weight heparins or heparinoids, while aspirin given within 24-48 hours after stroke onset was shown to have a significant but modest benefit. No data support the treatment with hemodilution or the administration of neuroprotective drugs. Evidence accumulating continuously determine the principles of general care including the methods and the targets in the acute phase of ischemic stroke regarding respiratory and cardiac care, management of blood pressure and blood glucose levels and body temperature.]