Search results

Lege Artis Medicinae

JULY 01, 2020

[Sarcopenia – muscle loss – pathomechanism, clinical presentation and metabolic comorbidities]


[Sarcopenia, or the age-related involution of muscle strength and muscle mass, is a serious public health concern, due to the growing number of elderly population caused by nowadays demographic changes i.e. prolonged life expectancy. By ageing, the muscle tissue is shrinking gradually, leading to the loss of muscle strength and masses. This condition is called sarcopenia. Sar­co­penia is the simultaneous decrease of muscle mass, muscle strength and functional independence. In parallel the physical performance deteriorates (weakness, slowness and poor physical balancing). Fatigue, el­derly behaviour and weight loss are the consequences of these accumulating deficits, which associate with cognitive decline and result in increasing social isolation. The primary form of sarcopenia is the decrease of the energy production of muscle cells and then the death of muscle cells. Se­con­dary, endocrine dysfunctions, diseases of the nervous system, decreased physical activity, malnutrition or malabsorption, chronic infection accelerate the process and aggravate the patient’s condition. Complex genetic, biochemical and endocrine mechanisms take part in the development of sarcopenia. This involution is due to the impaired balance of restoring and depleting processes of muscles. A questionnaire and algorithm have been developed to recognize, screen and diagnose the risks of sarcopenic condition; these separate the sarcopenic and non-sarcopenic patients with specific cut-off values. Sar­co­penia can be diagnosed based on walking speed, decreased handgrip strength and measured or calculated muscle mass in persons over 65. Sarcopenia can be considered as a phenomenon of “physiological” aging, however, it becomes a disease when diagnostic cut-offs are exceeded and the patient experiences functional disability and declining quality of life. Prevention and treatment of sarcopenia and reducing the risk of falling are based on regular active resistance and coordination exercises. Options for pharmaceutical treatments are limited since despite of identified molecular targets there are no convincingly effective innovative therapy on the horizon. Nevertheless, there are some weak evidence for efficacy of the application of amino acids stimulating muscle cell differentiation, such as leucine or the analogue of beta-hydoxy-methylbutyrate beside exercise therapy.]

Clinical Neuroscience

NOVEMBER 20, 2015

[Hyperglycaemic hemiballismus: implications from connectivity analysis for cognitive impairments]

KINCSES Tamás Zsigmond, VADÁSZ Dávid, NÉMETH Dezsõ, JANACSEK Karolina, SZABÓ Nikoletta, DÉZSI Lívia, BABOS Magor, VÖRÖS Erika, VÉCSEI László

[Hyperglycaemia induced movement disorders, such as hemiballism are rare disorders. The syndrome is characterised by the triad of hemiballism, contralateral T1-hyperintense striatal lesion and non-ketotic hyperglycaemia. Here we report a patient with untreated diabetes presenting with acute onset of hemiballism. MRI revealed T1 hyperintensity of the head of the caudate nucleus and the anterior putamen. The patient also had acantocytosis. Based on the detailed examination of the neuroradiological results and earlier findings we will imply on the pathomechanism. Based on previous findings microhemorrhages, extensive mineralisation, gemistocytic astrocytosis might play role in the development of the imaging signs. The connectivity pattern of the striatal lesion showed extensive connections to the frontal cortex. In coexistence with that the most severe impairment was found on the phonemic verbal fluency task measuring frontal executive functions. ]

Clinical Neuroscience

JANUARY 30, 2016

[Event-related potentials and clinical symptoms in schizophrenia]


[The investigation of schizophrenia’s aetiology and pathomechanism is of high importance in neurosciences. In the recent decades, analyzing event-related potentials have proven to be useful to reveal the neuropsychological dysfunctions in schizophrenia. Even the very early stages of auditory stimulus processing are impaired in this disorder; this might contribute to the experience of auditory hallucinations. The present review summarizes the recent literature on the relationship between auditory hallucinations and event-related potentials. Due to the dysfunction of early auditory sensory processing, patients with schizophrenia are not able to locate the source of stimuli and to allocate their attention appropriately. These deficits might lead to auditory hallucinations and problems with daily functioning. Studies involving high risk groups may provide tools for screening and early interventions; thus improving the prognosis of schizophrenia. ]

Clinical Neuroscience

JANUARY 30, 2016

Long term follow-up of lesional and non-lesional patients with electrical status epilepticus in slow wave sleep


Objectives – A retrospective study has been done at the Bethesda Children’s Hospital Epilepsy Center with those patients whose EEG records fulfilled in one or more records the criteria of electrical status epilepticus in slow wave sleep (ESES) pattern, occupying at least 75% of NREM sleep with bilateral discharges, and had detailed disease history and long term follow-up data, between 2000 and 2012. Patients and methods – Thirty-three patients (mean 11.1±4.2 years of age) were studied by 171 sleep EEG records. Sleep was recorded after sleep deprivation or during spontaneous sleep at least for one hour length of NREM. From the 492 EEGs, 171 sleep records were performed (average five/patient). Average follow-up time was 7.5 years. Eighty-two ESES records have been analyzed in 15 non-lesional and 18 lesional (11 with dysgenetic and seven with perinatal - asphyxic or vascular origin) patients. Variability of seizure types, seizure frequency and frequency of status epilepticus was higher in the lesional group. Impairment of the cognitive functions was moderate and partial in the non-lesional, while severely damaged in the lesional group. Results – EEG records of 29 patients showed unihemispherial spike fields with a perpendicular axis (in anterior, medial and posterior variants) to the Sylvian fissure, regardless their lesional or non-lesional origin. Only three (1one non-lesional and two lesional) patients had bilateral synchronous spike-wave discharges with bilateral symmetric frontocentral spike fields. The individual discharges of the sleep EEG pattern were very similar to the awake interictal records except their extension in time and field, their increased number, amplitude, and continuity of them and furthermore in the increased trans-hemispheral propagation and their synchronity. Conclusions – Assumed circuits involved in the pathomechanism of discharges during NREM sleep in ESES are discussed based on our findings.

Lege Artis Medicinae

MARCH 10, 2020

[The role of dyslipidaemia in the patomechanism of obstructive sleep apnoea ]

MÉSZÁROS Martina, BIKOV András

[Obstructive sleep apnoea (OSA) is the most recent sleep-breathing disorder, which is characterised by repetitive collapses of the upper airways. Chronic intermittent hy­poxia, sleep fragmentation and systemic inflammation play pre-eminent role in the pathogenesis of OSA and its comorbidities, such as dyslipidaemia. The triple impaired lipid metabolism results in OSA by dysregulated lipid synthesis of the liver, insuffi­cient lipoprotein clearance and increased lypolysis. Several previous studies examined the association between dyslipidaemia and OSA with various outcomes. The aim of this review is to present the pathomechanism of dyslipidemia in the OSA. ]

Clinical Neuroscience

JANUARY 30, 2020

[Current questions of multiple sclerosis: the secunder progressive form of the disease]


[Recent data suggest that long-term worsening is common in relapsing-remitting multiple sclerosis patients and is largely independent of relapses or new lesion formation on brain MRI. The current definition of secunder progressive multiple sclerosis is worsening of disability independent of relapses over at least 6-month interval. Early focal inflammatory disease activity and spinal cord lesion are predictors of very-long term disease outcomes in relapse - onset multiple sclerosis. The potential of PET imaging to visualize hidden inflammation in MS brain in vivo is an important contribution for better understanding the progression of the disease. Therefore, PET imaging is a promising tool in detecting the conversion from relapsing remitting multiple sclerosis to secunder progressive form of multiple sclerosis. Furthermore, neuro-axonal damage is the pathological substrate of permanent disability in different neurological disorders including multiple sclerosis. The neurofilament proteins have promise in this context because their levels rise upon neuro-axonal damage not only in the cerebrospinal fluid but also in blood. Patients with increased serum levels of neurofilament at baseline, independent of other clinical and MRI variables, experience significantly more brain and spinal cord volume loss over 2 years and 5 years of follow-up. The kynurenine-pathway abnormalities may be associated with the swich from early-mild stage multiple sclerosis to debilitating progressive forms of the disease. Analysis of these metabolites in serum may have application as multiple sclerosis disease biomarkers. Free radical action has been suggested as a causal factor in the illness. Increased free radical production and consumption of the scavenger molecules were found during the active phase of the disease. Based on the clinical findings (EXPAND Study) and pathomechanism of the disease siponimod is approved by the US Food and Drug Administration for the treatment of relapsing remitting forms of multiple sclerosis, to include secunder progressive multiple sclerosis with active disease, relapsing-remitting multiple sclerosis and clinically isolated syndrome.]

Clinical Oncology

FEBRUARY 20, 2019

[The role of the microbiome in the etiology and treatment of neoplastic diseases]

SCHWAB Richárd, BACSUR Emese, TORDAI Attila, PETÁK István

[Experimental data on the role of the microbiome in the onset and progression of infl ammatory diseases and cancer have been accumulated for years. An important milestone in this respect was the discovery that APC mutant mice in sterile conditions do not develop colon cancer of the FAP type. The direct role of the Enterobacteriaceae and Fusobacteriaceae bacterial families were also shown in the pathomechanism of the same experimental model. The toxic effect of chemotherapy on the gut fl ora has been well documented, but it may very well be that this putative side effect is part of the effi cacy, primarily in the case of adjuvant chemotherapy. The fi rst reproducible methods of microbiome molecular diagnostics are already available today. In addition to standard large clinical studies, we can increasingly rely on evidence of molecular pathomechanism and „real-world” clinical experience in the clinical interpretation of the microbiome. The overview summarizes the results of the fi eld research and its translation possibilities in terms of routine clinical practice.]

Clinical Neuroscience

SEPTEMBER 30, 2019

[The role of epigenetic regulations in early childhood diseases]


[With the acceptance of “The developmental origins of health and disease” concept in the 1990s, it became clear that epigenetic inheritance, which do not involve changes in the DNA sequence has important role in the pathogenesis of diseases. Epigenetic regulation serves the adaptation to the changing environment and maintains the reproductive fitness even on the drawback of increased risk of diseases in later life. The role of epigenetic mechanisms in chronic non-communicable diseases has been well established. Recent studies have revealed that epigenetic changes have also causal role in certain pediatric diseases. The review evaluates the recent epigenetic findings in the pathomechanism of common pediatric diseases. The wide range and long-lasting duration of epigenetic regulations give importance to the subject. Methods are already available to evaluate a part of the epigenetic changes in the clinical practice, presently aiming primarily the estimation of the disease risk or definition of diagnosis. Furthermore, there are already available limited means to influence the epigenetic regulation. ]

Hypertension and nephrology

SEPTEMBER 10, 2019

[Role of IL-10 family of cytokines in kidney fibrosis]

PAP Domonkos, VERES-SZÉKELY Apor, SZEBENI Beáta, SZIKSZ Erna, KISS József Zoltán, TAKÁCS István Márton, REUSZ György, SZABÓ J. Attila, VANNAY Ádám

[Chronic renal failure is a major health problem, affecting 8 to 16% of the population. Regardless of the etiology the common hallmark of chronic renal failure is inflammation, leading to the activation of renal myofibroblasts. Chronic activation of myofibroblasts lead to abnormal accumulation of extracellular matrix, disruption of the architecture of the kidney and finally to reduced renal function. Although our knowledge is rapidly expanding about the pathomechanism of chronic renal failure, we still have no drug to treat or hinder the progression of the disease. In our present review article, we summarize the role of the cytokines of the IL-10 family in renal scarring.]

Hypertension and nephrology

OCTOBER 20, 2018

[Hypertension and atrial fibrillation. Part 1. - Epidemiological data. The pathomechanism of PF in hypertension]


[Atrial fibrillation (PF) is the most common arrhythmia on the basis of analyzes conducted in different regions of the world. The main reason for this is the aging of the population. High blood pressure is one of the major factors of mortality in both developed and poor economical countries. The combined presence of the two diseases presents many hazards to our body. The most significant of these is the development of thromboembolic stroke, which is constantly increasing with age. The author analyzes in detail the aetiology called atrial cardiomyopathy, behind which there are complex structural, architectural, contractile and electro-physiological changes and leads to clinical manifestation of PF.]