Clinical Neuroscience

[MR investigations in stroke]

KENÉZ József, BARSI Péter

APRIL 20, 2002

Clinical Neuroscience - 2002;55(03-04)

[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.]



Further articles in this publication

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

[New methods in stroke intensive therapy: hemicraniectomy in patients with complete middle cerebral artery infarction and treatment of intracerebral and intraventricular hemorrhage with urokinase]

KAKUK Ilona, MAJOR Ottó, GUBUCZ István, NYÁRY István, NAGY Zoltán

[Life-threatening, complete middle cerebral artery infarction occurs in up to 10% of all stroke patients. The “malignant media occlusion” is an infarction occupying more than 50% of middle cerebral artery territory. The malignant, space-occupying supratentorial ischemic stroke is characterised by a mortality rate of up to 80%. Several reports indicate, that hemicraniectomy in this situation can be life-saving. Hemicraniectomy increases cerebral perfusion pressure and optimises retrograde perfusion via the leptomeningeal collateral vessels. A case of a patient is presented, having progressive neurological deterioration due to massive cerebral infarctions. The patient rehabilitation was successful. Decompressive surgery is life saving and can also give acceptable functional recovery. Hemorrhagic stroke is due to stroke in 15% of cases and in 10%, it is “spontaneous” intracerebral hematoma. The intracerebral and intraventricular hemorrhage represents one of the most devastating types of stroke associated with high morbidity and mortality. The 30-day mortality rate is 35% to 50% and most survivors are left with a neurological disability. The value of surgical therapy is debatable. The aspiration and urokinase therapy of the hematoma of intracerebral hemorrhage could improve final neurological outcome. Spontaneous, nontraumatic intraventricular hemorrhage frequently carries a grave prognosis. A large part of morbidity after intraventricular hemorrhage is related to intracranial hypertension from hydrocephalus. One patient presented had intracerebral hemorrhage and another had intraventricular hemorrhage treated with urokinase. Rapid and extensive reduction in the amount of intracerebral and intraventricular blood occurred. Urokinase lysis is safe and can be a potentially beneficial intervention in intracerebral and intraventricular hemorrhage. By performing decompressive craniectomy, the neurologists of stroke departments and intensive care units with the neurosurgeons will have to play major role in the management of stroke patients.]

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.]

Clinical Neuroscience

[Genetics and hemostasis in young stroke patients]


[Background and purpose - The classical risk factors did not explain all the possible ethiology of cerebral stroke. Genetic polymorphisms responsible for thrombophilia were implicated recently as risk factors of stroke. In this geneticoepidemiological study the author’s aim was to analyse the tendency of genetic polymorphisms to cluster in a cohort of young and elderly stroke patients and in healthy subjects in Hungary. Methods - 253 patients with stroke were compared with 173 healthy blood donors on the basis of genetic polymorphisms of platelet GP IIb/IIIa receptor (33 LeuPro), prothrombin gene G20210A, Factor V Leiden mutation, ACE I/D, methylenetetrahydrofolate reductase (MTHFR) and β fibrinogen gene G455A. These data were acquired using PCR. Questionnaires were used to investigate the family history and to determine the risk factor profile. The subtypes of stroke were analysed in a stroke cohort grouped according to different polymorphisms. Results - An increased frequency of GP IIIa heterozygousity was found as compared to a West-European stroke cohort (31% versus 19%). The prothrombin gene variant (2.9% European and 4.8% in Hungary) was also found to increase in frequency. In young stroke patients (age <50) compared with control subjects the odds ratios were higher: in prothrombin gene (OR: 4.9), in Leiden mutation (OR: 1.67), in fibrinogen gene (OR: 1.64) and in MTHFR(+/+) (OR: 1.58). Clustering of two polymorphisms could only be detected in young patients. These clustering polymorphisms were GP IIb/IIIa with prothrombin G20210A variant (OR: 6.74, 95% CI 1.1-18.2) and prothrombin gene variant with MTHFR (OR: 5.3, CI95 1.2-8.3). Conclusion - Selected and clustered genetic polymorphisms of haemostatic factors could be responsible for the high stroke morbidity in Central Europe. The presence and clustering tendency of these factors have been described in young stroke victims.]

Clinical Neuroscience

[Mental disorders after stroke]

VARGA Dániel

[Stroke represents a major public health problem in Hungary, but relatively little attention is directed toward poststroke neuropsychiatric disturbances. Stroke patients frequently represent mood disturbances, cognitive decline, anxiety disorders, and sometimes serious schizophorm or paranoid states. Poststroke depression is the most common and possibly amenable form to therapeutic intervention. Depressiv symptoms have negativ effect on the rehabilitation process, quality of life and even on long-term survival. Considering drug therapy, in the past decade tricyclic drugs have been replaced by newly developed antidepressants with milder side-effects profile. Our knowledge on the relationship among vascular and other types of dementia has been extended in the recent years. This development also has some therapeutic implications. It seems likely that other psychiatric disorders, psychoses, pathological affect and personality disorders also inhibit recovery and limit long-term quality of life, but abvailable data on this topic is limited.]

All articles in the issue

Related contents

Clinical Neuroscience


TÓTH Marianna, KUNDRA Olga, KULIN Árpád

[Introduction - While examining patients with headache, abnormalities of unknown significance may quite frequently be encountered. In migraine small, subcortical, white matter abnormalities (WMAs) can be visualized by magnetic resonance images. The connection of these WMAs with the migraine is unclear, but some studies report the higher incidence of WMA in migraine. Patients and method - The authors reviewed the MR scans of their new migraine patients younger than 55 years treated in period of 15 months, and compared the data with a control group. Results - The prevalence of WMA was 10.3% among the migraineurs (78 patients without comorbidities such as hypertension, atherosclerotic heart disease, diabetes mellitus, autoimmun disorder or demyelinating disease) and it was 3.1% in the group of controls (32 persons younger then 55 years, and without migraine or other disease mentioned above). There were patients with WMA both below and above the age of 40; all of them were suffering from migraine without aura with 1 or more attack per month in variable times; none of them had smoked, the majority hadn't used oral contraceptive, and only a few of them used triptan or ergotamin. Conclusion - The data presented here shows that there is a relationship between migraine and WMA. The association of WMA and the risk of following stroke is not cleared. There are well known studies analysing the prevalence of silent infarction too, but we need a long prospective study to answer this question exactly.]

Clinical Neuroscience


OLÁH László, CSÉPÁNY Tünde, BERECZKY Zsuzsanna, KERÉNYI Adrienne, MISZ Mária, KAPPELMAYER János, CSIBA László

[Introduction - Decreased activity of natural anticoagulants (antithrombin-III, protein C, protein S) rarely causes cerebral ischaemia, however it can be found frequently in acute phase of ischaemic stroke. The authors’ aim was to investigate whether the decreased activity of natural anticoagulants is accompanied by worsening of symptoms in ischaemic stroke. Patients and method - Sixty-eight acute ischaemic stroke patients were investigated. Severity of symptoms were assessed and followed by the NIH Stroke Scale. Antithrombin- III, protein C, protein S activities, and concentration of C-reactive protein (CRP) were measured within 48 hours after onset of ischaemic stroke. Results - Progressing stroke was found in 29% of patients. Decreased activity of at least one natural anticoagulant proteins was present in 31% of patients. Progression of stroke symptoms occured in 76% of patients with decreased natural anticoagulant activity, while this proportion was only 9% in those with normal natural coagulation inhibitor protein activity (p<0.01). Progressing stroke was also more frequent in patients with elevated CRP value (60%) than in those with normal CRP level (11%; p<0.05). Decreased activity of natural anticoagulants was more frequent in patients with elevated CRP concentration compared with patients with normal CRP. Conclusion - The results demonstrate the importance of decreased activity of natural anticoagulants in acute phase of ischaemic stroke. This abnormality was present in about 1/3 of stroke patients. The decreased activity of natural coagulant inhibitor proteins may play an important role in development of progressing stroke thus indicating unfavourable outcome.]

Hungarian Radiology

[Radiology of pancreas: review from the last year - Gastro Update 2007]


[PURPOSE - To demonstrate the recent results in radiological diagnostics of pancreas, and the actual place of the imaging and interventional methods. METHOD - Systematic review of the most recent articles from the last year in the following subjects: acute, chronic and autoimmune pancreatitis, pancreatic cancer and other tumors, PET and special imaging problems in pancreas transplantation. RESULTS - Annually, experience in pancreatic diagnostical methods are accumulating rapidly. Therefore, there is a continuous change in the examination algorithm with new diagnostic and therapeutic modalities making their way into the daily routine. Some of the algorithms become obsolete within a few years and their further application is considered mismanagement. Some other methods become obligatory steps in the diagnostics. These are the reasons why up-to-date knowledge of the literature is mandatory.]

Lege Artis Medicinae

[The role of MRI in the diagnosis of tumours]


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Lege Artis Medicinae

[Importance of statin therapy in stroke prevention]


[Stroke is the third leading cause of death and a leading cause of major adult disability in developed countries. The annual incidence of hospitalized stroke varies between 400-500 per 100 000 inhabitants every year in Hungary. In the past decade, cholesterol lowering with 3- hydroxy-3-methylglutaryl-coenzyme A (HMGCoA) reductase inhibitors (statins) has proved to reduce risk of stroke in patients with and without coronary disease (CAD). In patients with CAD, statin therapy reduces the risk of first stroke by 25% to 35% versus placebo and, moreover, intensive statin therapy to LDL-C targets below 2.6 mmol/L (100 mg/dL) appears to reduce the risk further. More recently it has also been shown that intensive statin therapy can reduce risk of recurrent stroke in nondiabetic as well as diabetic patients with recent stroke or transient ischaemic attack but no CAD. The overall reduction of stroke and TIA was 23%. Evidence from retrospective studies suggests that in addition to risk reduction statin pretreatment may improve stroke outcome. It may due to their pleiotropic effects that include improvement of endothelium function, anti-inflammatory, antithrombotic, and immunomodulatory effects. As statins have both an excellent safety profile and simple administration, physicians should consider using statins, at dosages shown to have efficacy in clinical trials, in all patients whose cardiovascular risk profile puts them at high risk of stroke.]