Clinical Neuroscience


NAGY Zoltán

APRIL 20, 2002

Clinical Neuroscience - 2002;55(03-04)



Further articles in this publication

Clinical Neuroscience

[Vasoreactivity impairment in brainstem and hemispherial small vessel disease, a comparative study]


[Aims - Cerebrovascular small vessel disease may lead to an impairment of vasoreactivity (VR). Vasoregulatory impairment in internal carotid artery distribution area has been established. In this study the authors sought the answer to the question if VR of vertebrobasilar (VB) territory was impaired in brainstem small vessel diseases and if vasoregulatory impairment differed between the two distribution territories. Methods - VR of carotid and VB territory was compared applying different functional tests (ventilation, tilting, acetazolamide) in 25 patients with brainstem lacunar infarcts, 20 patients with periventricular leukoaraiosis and in 35 control subjects. Cerebral blood flow velocity (CBFV) of basilar artery (BA) and middle cerebral artery (MCA) was monitored with transcranial Doppler (TCD), systemic blood pressure and CO2 partial pressure of expired air were also registered. Results - In the BA territory the VR was significantly smaller in the patient than in the control group (3.1± 4.6 cm/sec/kPa vs. 8.2 ± 6.2 cm/sec/ kPa, p=0.01) during hypercapnia. In a subgroup of patients with mean baseline CBFV<25 cm/sec, the VR was significantly smaller and PI nonsignificantly higher than in patients with baseline CBFV >25cm/s (VRCO2 1.5±2.0 cm/sec/kPa vs. 6.5±6.5 cm/sec/kPa, p=0.007; PI 1.11±0.30 vs. 1.0±0.26, p=0.4) indicating higher vascular resistance in the former group. Results of tilting tests showed similar but nonsignificant changes while acetazolamide tests revealed no differences between the two groups. In the MCA territory the VR was significantly lower in patients than in the controls during hypercapnia (4.7±3.7 cm/sec/kPa vs. 18.4±6.8 cm/sec/kPa, p< 0.001) and showed a nonsignificant tendency to be lower in patients than in controls during hypocapnia (14.6±13.8 cm/sec/kPa vs. 24.7±21.2 cm/sec/kPa, p=0.1). Although CBFV measurements during acetazolamide test tended to support these findings, they showed no significant differences between patients and controls. During head-up tilt the CBFV did not differ significantly between the two groups. The VRCO2 is significantly higher in the MCA than in the BA territory (18.4 CI95 2.98 vs. 10.1 CI95 3.01; p<0.001). The impairment of VRCO2 was more severe in the MCA territory (VR decreased to 26% of baseline in the MCA and to 34% in the BA territory). Conclusion - The capacity of carotid territory VR exceeds that of VB territory. The impairment of VR is present in both the carotid and VB territories and is more severe in the former region. The most feasible test to reveal this impairment is the hypercapnic test. There is a strong correlation between the extent of vasoregulatory impairment and baseline CBFV in brainstem small vessel diseases.]

Clinical Neuroscience

[Marker molecules of endothelial cell dysfunction in acute ischemic stroke]

SZEGEDI Norbert, MAY Zsolt, ÓVÁRY Csaba, SKOPÁL Judit, NAGY Zoltán

[Introduction - In spite of all similarities, ischemic stroke cases representing 80% of the acute cerebrovascular accidents, different steps of platelet activation, coagulation and fibrinolytic cascade are involved in the patomechanism of the different stroke subtypes. The differentiation of the atherothrombotic, cardioembolic and lacunar forms of acute ischemic stroke is based on the comprehensive evaluation of clinical signs, neuroimaging technics, and diagnostic ultrasound, but also a significant effort was made to characterize the specifities of the underlying processes of the coagulation system by signal molecules, in order to clarify their possible role and to support the diagnostic and therapeutic decisions. Patients and methods - The von Willebrand factor was studied as the marker of endothelial injury in 34 acute ischemic stroke patients within 24 hours after the onset of their stroke, and repeatedly 2, 4, and 12 weeks thereafter. To determine the probable source of the von Willebrand factor, usually released not only by endothelial cells, but also by platelets, the authors simultaneously measured the levels of an additional endothelial marker, thrombomodulin, and a platelet activation marker, β-thromboglobulin. Results - The mean of von Willabrend factor levels measured in stroke patients on the first day was 123%, whereas the mean of the control group 72% (p<0.05). There was no significant difference according to stroke subtype. Von Willebrand values determined two weeks later showed a further 60% increase in stroke patients, and after a gradual fall their level remained above the concentration of the control group. The β-thromboglobulin level measured in stroke group was significantly higher, than in control individuals (171 IU/ml vs. 32 IU/ml, p<0.001). This was characteristic for atherothrombotic and cardioembolic stroke, but not for lacunar infarctions. If measured repeatedly, β-thromboglobulin levels decreased rapidly in the first two weeks, than somewhat slower. Soluble thrombomodulin was slightly elevated in stroke patients (4.24 ng/ml) compared to healthy subjects (3.81 ng/ml), without statistical significance, and without major differences between subgroups. Conclusions - While early determination of β-thromboglobulin can contribute to the differential diagnoses of the subtypes of ischemic stroke, the long-lasting elevation of von Willebrand factor may reflect endothelial dysfunction caused by several factors in the microvasculature of the penumbra.]

Clinical Neuroscience

[The problems of the post-stroke care]


[All patients having had stroke or TIA require special post-hospital care, being mainly the task of general pracititioners. The number of patients surviving stroke in Hungary is approximately 30 000/year. An important focus of care is secondary prevention: antithrombotic treatment and risk factors reduction. In case of residual signs of stroke, rehabilitation must also be organized and supported by the general practitioner. Medical conditions of cerebrovascular patients requiring special care demand are reviewed by the author. In this respect, some post-stroke conditions like dementia and depression require extra attention.]

Clinical Neuroscience

[MR investigations in stroke]

KENÉZ József, BARSI Péter

[In the article digital imaging methods are presented with special emphasis on the use on diagnostics of cerebral circulation studies. Recently, fundamental changes have happened in this field, concerning especially the MR investigations. These changes have influenced the therapeutic strategies of ischaemic stroke. Authors give the theoretical background on the diffusion and perfusion MR imaging, emphasising the importance of their “mismatch” and its impact in the estimation of the outcome of ischaemic events. More recently, new, controversial facts arose, regarding the reasons of the introduction of the theory of so called “negative” and “positive” mismatches. As a consequence, a level of uncertainty took place in the judgement of prognostics. The leading institutions are searching the way to solve the problem which seems to be the quantitative evaluation of the diffusion, perfusion and mismatch data. The advent of the multislice spiral CT with very fast imaging and the importance of CT investigations increased. With this new kind of equipment, even perfusion studies can be performed using iodinated contrast medium.]

Clinical Neuroscience

[Regulatory mechanisms in focal cerebral ischemia. Perspectives in neuroprotective treatment]

NAGY Zoltán, SIMON László, BORI Zoltán

[Permanent or temporary disruption of cerebral blood flow rapidly depletes brain regions of their limited energy reserves (glycogen, glucose, oxygen, ATP) leading to an energy crisis. Tissue damage occurs due to the energy crisis. The central part of the damage, the ischaemic “core” region is surrounded by zones of the shell-like penumbra. Necrotic, as well as apoptotic cell death could be identified in the penumbra. Going away from the ischaemic core different neurochemical processes are occuring by space and time.“Immediate early response” genes (c-fos, fos-B, c-Jun, krox 20, 24) are activated, heatshock proteins (hsp 70, 72, HSF, HSE, HIF), cytokines (TNF-α, IL-1β), inflammatory factors (COX), adhesion and glial factors (ICAM-1, ELAM-1, P-selectin), vasoactive factors (IL -6, -10, PAF), reactive oxigen radicals and connected factors (O2, OH, NO, NOS, SOD) are produced within minutes and hours. Cell deaths, necrosis and apoptosis due to the activation of calpains, caspases and nucleases occur in days. In parallel, growth factors and plasticity proteins (BDNF, NGF, TGF-β, VEGF, PDGF, GAP-43) are activated as a basis of functional rehabilitation.]

All articles in the issue

Related contents

Clinical Neuroscience

Cyanocobalamin and cholecalciferol synergistically improve functional and histopathological nerve healing in experimental rat model

ALBAY Cem, ADANIR Oktay, AKKALP Kahraman Asli, DOGAN Burcu Vasfiye, GULAEC Akif Mehmet, BEYTEMUR Ozan

Introduction - Peripheral nerve injury (PNI) is a frequent problem among young adults. Hopefully, regeneration can occur in PNI unlike central nervous system. If nerve cut is complete, gold standard treatment is surgery, but incomplete cuts have been tried to be treated by medicines. The aim of the study was to evaluate and compare clinical and histopathological outcomes of independent treatment of each of Vitamin B12 (B12) and Vitamin D3 (D3) and their combination on sciatic nerve injury in an experimental rat model. Materials and methods - Experimental animal study was performed after the approval of BEH Ethics Committee No. 2015/10. 32 rats were grouped into four (n=8) according to treatment procedures, such as Group 1 (controls with no treatment), Group 2 (intraperitoneal 1 mg/kg/day B12), Group 3 (oral 3500 IU/kg/week D3), Group 4 (intraperitoneal 1 mg/kg/day B12+ oral 3500 IU/kg/week D3). Sciatic Functional Index (SFI) and histopathological analysis were performed. Results - SFIs of Group 2, 3, 4 were statistically significantly higher than controls. Group 2 and 3 were statistically not different, however Group 4 was statistically significantly higher than others according to SFI. Axonal degeneration (AD) in all treatment groups were statistically significantly lower than in Group 1. AD in Group 4 was significantly lower than in Group 2 and 3; there was no significant difference between Group 2 and 3. There was no significant difference between Group 1,2 and 3 in Axonolysis (A). But A of Group 4 was significantly very much lower than all others. Oedema- inflammation (OE-I) in all treatment groups were significantly lower than in Group 1; there was no significant difference between Group 2 and group 4. OE-I in Group 2 and 4 were significantly lower than in Group 3. There were no significant differences between Group 1, 2 and 3 in damage level scores; score of Group 4 was significantly lower than of Group 1. Conclusions - B12 and D3 were found effective with no statistically significant difference. But combined use of B12 and D3 improve nerve healing synergistically. We recommend combined use of B12 and D3 after PNI as soon as possible.

Clinical Neuroscience

Delirium due to the use of topical cyclopentolate hydrochloride


Introduction - Our aim is to present a rare case where a child had delirium manifestation after instillation of cyclopentolate. Case presentation - A 7-year old patient was seen in our outpatient clinic, and cyclopentolate was dropped three times at 10 minutes intervals in both eyes. The patient suddenly developed behavioral disorders along with gait disturbance, and complained of visual hallucinations 20-25 minutes after the last drop. The patient was transferred to intensive care unit and 0.02 mg/kg IV. physostigmine was administered. The patient improved after minutes of onset of physostigmine, and was discharged with total recovery after 30 minutes. Conclusion - Delirium is a rare systemic side effect of cyclopentolate. The specific antidote is physostigmine, which can be used in severely agitated patients who are not responding to other therapies.

Clinical Neuroscience

The effects of the level of spinal cord injury on life satisfaction and disability

GULSAH Karatas, NESLIHAN Metli, ELIF Yalcin, RAMAZAN Gündüz, FATIH Karatas, MÜFIT Akyuz

Introduction - Spinal Cord Injury (SCI) may often lead to significant disability in affected individuals and reduce life satisfaction. Herein we aimed to investigate the effects of the level of injury on disability and life satisfaction as well as the relation between life satisfaction and disability. Methods - Patients with at least one-year history of SCI were included. Demographic-clinical data of patients were recorded. The Craig Handicap Assessment and Reporting Technique-Short Form (CHART-SF) was used for quantifying the degree of patients’ disability. Life satisfaction was assessed by the Satisfaction with Life Scale (SWLS). Results - Of the 76 patients, 21 (27.6%) were tetraplegic and 55 (72.4%) were paraplegic. SWLS was found to be similar in tetraplegic vs. paraplegic patients (P=0.59), whereas CHART parameters such as physical independence, mobility, occupation, and total CHART value were significantly higher in paraplegic patients (P=0.04, P=0.04, P=0.001 and P=0.01, respectively). Social integration was found similarly high in both groups. There was a positive correlation between elapsed time after the injury and CHART physical independence, occupation and the level of economic sufficiency (P<0.01, P<0.01, P=0.01). Excluding the economic sufficiency (P=0.02), there was not any other association between the rest of CHART parameters and SWLS. Conclusions - According to our findings, although the level of injury seems to be influential on disability, it seems to have no significant effect on life satisfaction. Since the only thing that positively affects life satisfaction is economic sufficiency, more emphasis should be placed on regulations that increase the return to work in patients.

Clinical Neuroscience

Valproic acid associated pleuropericardial effusion: case report

DEMIR Figen Ulku

Introduction - Valproic acid is an effective antiepileptic and mood stabilizer used in the treatment of many neurological and psychiatric disorders. Although there are frequently seen side effects, effusions between layers of pleural and pericardial membranes are rare to be seen. Case - Pleuropericardial effusion was detected in a 23 years old woman who was under valproic acid treatment because of epileptic seizure. After 1 year of valproic acid treatment, patient complained of dyspnea. As all the researches intended on etiology were usual, valproic acid has been thought to be responsible for the matter. Control examination after 1.5 months regarding the end of treatment revealed complete recovery of pleuropericardial effusion. Discussion - Pleural and pericardial effusions are rarely seen complications related to the use of valproic acid. It must also be kept in mind that valproic acid causes a potential for such side effects which can be blamed etiologically when the other possibilities for patients are excluded.

Clinical Neuroscience

Isolated hypoglossal nerve palsy due to a jugular foramen schwannoma


Introduction – Although the involvement of the hypoglossal nerve together with other cranial nerves is common in several pathological conditions of the brain, particularly the brainstem, isolated hypoglossal nerve palsy is a rare condition and a diagnostic challenge. Case presentation – The presented patient arrived to the hospital with a history of slurred speech and an uncomfortable sensation on his tongue. Neurological examination showed left-sided hemiatrophy of the tongue with fasciculations and deviation towards the left side during protrusion. Based on the clinical and MRI findings, a diagnosis of hypoglossal nerve schwannoma was made. Discussion – Hypoglossal nerve palsy may arise from multiple causes such as trauma, infections, neoplasms, and endocrine, autoimmune and vascular pathologies. In our case, the isolated involvement of the hypoglossal nerve was at the skull base segment, where the damage to the hypoglossal nerve may occur mostly due to metastasis, nasopharyngeal carcinomas, nerve sheath tumors and glomus tumors. Conclusion – Because of the complexity of the region’s anatomy, the patient diagnosed with hypoglossal nerve schwannoma was referred for gamma knife radiosurgery.