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Clinical Neuroscience

MARCH 30, 2020

[New applications of conventional EEG analysis ]

CLEMENS Béla, PUSKÁS Szilvia

[Neurophysiological research suggests that the so-called “standard” EEG analysis has been confronted with new diagnostic challenges. The findings mainly concern the occurrence, the neurophysiological and clinical significance of epileptiform EEG discharges in several neurological and psychiatric disorders. In addition to well-known interictal and ictal discharges, a growing number of recently recognized epileptiform phenomena have been described. The first reports suggested that they might be relevant for the comprehensive description of epileptic dysfunction and might contribute to diagnosis and treatment as well. However, considerable improvement of present-day “standard” EEG technique is necessary to give an appropriate answer to most challenges. Reliable registration and quantitative assessment of well-known epileptiform transients require extended electrode coverage of the head (high-density EEG) and long-term recordings including waking and sleep states to estimate frequency and dyna­mics of targeted activities. Computer-based automatic event detection is preferable to spare time and cost of the evaluation. The authors review recent progress concerning epidemiology, neurophysiology and clinical impact of well-known epileptiform transients and candidate epileptiform activities in neurological and psychiatric conditions. However, recent results need confirmation in large patient populations; therefore, research should not be restricted to a few central laboratories.]

Clinical Neuroscience

MARCH 30, 2019

EEG-based connectivity in patients with partial seizures with and without generalization

DÖMÖTÖR Johanna, CLEMENS Béla, EMRI Miklós, PUSKÁS Szilvia, FEKETE István

Objective - to investigate the neurophysiological basis of secondary generalization of partial epileptic seizures. Patients and methods - inter-ictal, resting-state EEG functional connectivity (EEGfC) was evaluated and compared: patients with exclusively simple partial seizures (sp group) were compared to patients with simple partial and secondary generalized seizures (spsg group); patients with exclusively complex partial seizures (cp group) were compared to patients with cp and secondary generalized seizures (cpsg group); the collapsed sp+cp group (spcp) was compared to those who had exclusively secondary generalized seizures (sg group). EEGfC was computed from 21-channel waking EEG. 3 minutes of waking EEG background activity was analyzed by the LORETA Source Correlation (LSC) software. Current source density time series were computed for 23 pre-defined cortical regions (ROI) in each hemisphere, for the 1-25 Hz very narrow bands (1 Hz bandwidth). Thereafter Pearson correlation coefficients were calculated between all pairs of ROI time series in the same hemisphere. Z-scored correlation coefficients were compared at the group level (t-tests and correction for multiple comparisons by local false discovery rate, FDR). Results - Statistically significant (corrected p<0.05) EEGfC differences emerged at specific frequencies (spsg > sg; cpsg > cp), and at many frequencies (sg > spcp). The findings indicated increased coupling between motor cortices and several non-motor areas in patients with partial and sg seizures as compared to patients with partial seizures and no sg seizures. Further findings suggested increased coupling between medial parietal-occipital areas (structural core of the cortex) and lateral hemispheric areas. Conclusion - increased inter-ictal EEGfC is associated with habitual occurrence of secondary generalized seizures.

Lege Artis Medicinae

AUGUST 30, 2018

[Feeding and eating in infancy and early childhood part II. - Breastfeeding, complementary feeding and weaning in the Large-sample of the “For Healthy Offspring” project]

NÉMETH Tünde, VÁRADY Erzsébet, DANIS Ildikó, SCHEURING Noémi, SZABÓ László

[INTRODUCTION - Complementary feed-ing is the transitional period from exclusive breastfeeding to family foods, while breastfeeding is continued. It should be started, when breastmilk itself no longer meets the infant’s nutritional requirements, ideally at the age of around 6 months. SUBJECTS AND METHODS - In the Healthy Offspring project self reported questionnaires were received from 1133 parents of 0-3 year old children. Comple­mentary feeding practices and issues of weaning were analyzed. RESULTS - In our sample complementary feeding was started at the age of 5.5±1.8 months. 6% of infants younger than 4 months and about two third of infants at the age between 4 and 6 months were started on complementary feeding. 32% of the 7-12 month old infants were continued on breastfeeding. The proportion of breastfed infants and young children in the 12-24 and 25-36 month age group was 24% and 5.5% respectively. The daily feeding frequency of breastfed infants was 6.7±1.6. The infants and young children, who were breastfed along with complementary feeding were feeding 5.6±1.5 times/day. After completed weaning the range of feeding frequency was limited to 4.9±0.9 occasions/day. 60.4% of mothers regarded their feeding style on demand, while 39.6% on set schedule. 16% of mothers reported that their child had feeding difficulties. CONCLUSIONS - Complementary feeding indicators should be part of infant feeding data collection, such as time of introduction of complementary food, feeding frequency, food consistency, energy density of food and safe preparation. Responsive feeding is part of responsive parenting and should be promoted, along with continuing breastfeeding at least till one year of age, and for as long as mother and infant wish to continue. ]

Lege Artis Medicinae

JULY 20, 2017

[Relationship between adipokinome and lipid parameters in Hungarian obese patients]

LŐRINCZ Hajnalka

[Since the prevalence of obesity has been dramatically increasing worldwide, a better understanding of obesity-related comorbidities leading to carbohydrate and lipid metabolism disorders has become essential. As an active endocrine organ, white adipose tissue secretes adipokines with diverse biological functions. We have found strong correlations between serum chemerin level and atherogenic lipoprotein sub-fractions in obese non-diabetic patients. To better characterize obese patients with and without manifest insulin resistance, we plan to determine serum levels of novel adipokines (omentin-1, vaspin, visfatin, lipocalin-2 and plasminogen activator inhibitor-1) and various oxidative stress markers including paraoxonase-1 activity, tumor necrosis factor-alfa and interleukin-6 levels, as well as low- and high-density lipoprotein subfractions in them and compare their data with lean individuals. We plan to determine correlations between the levels of novel adipokines and oxidative stress markers and lipoprotein subfractions. Furthermore, based upon our previous observations, we plan to study the potential alterations in the adipokine profile and the ratios of lipoprotein subfractions during a 5-year follow-up in obese patients. Our expected results may help to characterize the involvement of the adipokine profile in the regulation of lipoprotein metabolism. Early screening and treatment of lipid abnormalities may help to reduce the risk of cardiovascular events in obesity. ]

Clinical Neuroscience

MAY 30, 2017

[EEG-based cerebral networks in 14 neurological disorders]

DÖMÖTÖR Johanna, CLEMENS Béla, CSÉPÁNY Tünde, EMRI Miklós, FOGARASI András, HOLLÓDY Katalin, PUSKÁS Szilvia, FEKETE Klára, KOVÁCS Attila, FEKETE István

[Background - Brain networks have not been systematically investigated yet in most neurological disorders. Purpose - To investigate EEG functional connectivity (EEGfC) networks in 14 neurological disorders. Patients - Potentially eligible patients were collected from clinical and EEG databases. All the available clinical data and EEG records were critically revised. All the patients who suffered of a single neurological disorder (out of the 14) and had a good quality EEG recording entered the study. Confoundig factors as comorbidity and CNS-active drug effects were eliminated as far as possible. EEG analysis - Three minutes of resting-state, waking EEG activity were selected for analysis. Current source density (CSD) values were computed for 2394 cortical voxels by Low Resolution Electromagnetic Tomography (LORETA). Thereafter, Pearson correlation coefficients were computed between all pairs of 23 cortical regions of interest (ROI) in each hemisphere (LORETA Source Correlation, LSC software). Computation was carried out for conventional EEG broad bands and very narrow bands (1 Hz bandwidth) between 1 and 25 Hz as well. Correlation coefficients of each group were statistically compared to our normative EEG (LSC) database by two-talied t-tests. Bonferroni-corrected p<0.05 values were accepted as statistically significant, and were graphically displayed as topographical networks. Results and conclusion - Group-specific networks were demonstrated. However, non-specific networks, charasteristic for most groups, were detected as well. Common finding were: decreased connectivity in the alpha band and increased connectivity in the delta, theta bands and upper-beta band. Decreased alpha-band connectivity presumably reflected primary lesional effects and on the other hand, non-specific vulnerability of “rich club connections”. Increased connectivity in the slow bands presumably indicated adaptive-compensatory activity of brain homeostasis. ]

Lege Artis Medicinae

FEBRUARY 05, 2016

[Effect of rosuvastatin therapy’s introduction on lipid levels and on proportion of target values reaching in patients with familial hypercholesterolemia and familiarity]

SZTANEK Ferenc

[Familial hypercholesterolemia (FH) is a genetically heterogeneous disorders characterized by very high total cholesterol and low-density lipoprotein (LDL) cholesterol levels, and it accelerates the development of atherosclerosis and early cardiovascular disease. FH is most commonly caused by mutations in low-density lipoprotein receptor (LDLR) or apolipoprotein B-100 (APOB) genes. In rest of the cases the mutation is in the proprotein convertase subtilisin/kexin type 9 (PCSK9) gene. Previous studies have shown that rosuvastatin significantly reduces major cardiovascular events in high risk patients. The goal of our study was to investigate the lipid-altering efficacy of simvastatin or atorvastatin therapy compared with high-intensity rosuvastatin therapy in patients with FH and familiarity. Recent work has demonstrated the efficacy of high-intensity rosuvastatin therapy in enabling high-risk and very high-risk patients in lowering significantly plasma levels of total and LDL-cholesterol, which can subtantially affect major cardiovascular events in familial hypercholesterolemia.]

Lege Artis Medicinae

DECEMBER 15, 2015

[The positive additive effect of rosuvastatin on platelet aggregation parameters in patients with cerebrovascular disease]

FEHÉR Gergely

[Statin therapy is the cornerstone of anti-atherosclerotic treatment, and it considered obligatory in the secondary prevention of atherosclerotic diseases. Rosuvastatin is well-known and efficacious lipid-lowering agent and seems to have benefitial antiplatelet efficacy and anti-inflammatory profile. The aim of our study was to determined the antiplatelet effect of 20 mg rosuvastatin (Xeter®, Richter Gedeon Nyrt.) in clopidogrel treated cerebrovascular patients. 20 patients with documented ischaemic cerebrovascular events and on 75 mg clopidogrel daily treatment were included in our study. 20 mg generic rosuvastatin significantly decreased total cholesterol (5.67 vs. 3.99 mmol/l, p<0.05), low-density lipoprotein (3.11 vs. 1.92 mmol/l, p<0.05) and trigliceride levels (1.75 vs. 1.29 mmol/l, p<0.05), and there was a non-significant high-density lipoprotein increasing (1.28 vs. 1.36 mmol/l, p=0.09) and high-sensitive C-reactive protein level decreasing tendency (3.35 vs. 2.99 mg/l, p=0.07). Rosu­vastatin treatment significantly decreased ADP 5 µM (46.15 vs. 31.35%) and collagen 2 mg/ml (68.62 vs. 52.22%) induced platelet aggregation (p<0.05). 20 mg rosuvastatin has a robust antilipaemic profile with benefitial additive effect on agonist induced platelet aggregation.]

Lege Artis Medicinae

JULY 20, 2015

[Treatment of chronic Pseudomonas aeruginosa lung infections in cystic fibrosis with inhaled tobramycin]

NAGY Béla, HOLICS Klára

[BACKGROUND - Intermittent or chronic pulmonary infections caused by Pseudo­monas aeruginosa (Pa) deteriorate clinical status and worsen lung function in patients with cystic fibrosis (CF). The prognosis of the disease and life expectancy of patients are substantially dependent on lung infections and inflammation; therefore the primary goal of the treatment is the early termination of the infection. PATIENTS AND METHODS - Efficacy of tobramycin (TOBI® 300 mg/5 mL solution for inhalation, henceforth TOBI®) inhalation in Pa pulmonary infections was studied in a non-interventional, observational, open-label, single-arm trial in subjects with CF. Fifty-three patients aged six to 31 years (averaged 15.8 years) were enrolled into the study. Three treatment cycles of TOBI® inhalation (28 days on drug, 28 days off drug) plus 6 months observational period were evaluated. Primary endpoint was changing in the predictive values of forced expiratory volume in 1 sec (FEV1) compared to the initial values after three cycles of the treatment. Secondary endpoints were changing in the FEV1 predictive values at the end of the complete study compared to the initial values; ratios of patients with decreased density of originally Pa-positive result of sputum culture; as well as safety and tolerability of the TOBI® treatment. RESULTS - FEV1 and FEV1% results were unchanged comparing to the initial values at the end of the treatment and after the observational period in the whole study population. However, sputum cultures became negative in 47.2% of all subjects as a result of the treatment, and the FEV1 values were gradually increased in these patients: after the third treatment cycle plus 160 mL, and at the end of the study plus 110 mL comparing to the initial values. Similar considerable increase was detected in the predictive FEV1% in this sub-group: after the first cycle plus 5.2%, at the end of third cycle plus 7%, after the observational period above 3.8% considering the starting results. CONCLUSIONS - TOBI® inhalation proved to be effective in improvement of lung function results and eradication of infection in our patients with Pa positive CF. The treatment was well tolerated and safe.]

LAM KID

FEBRUARY 20, 2014

[Bone metabolism and the 10-year probability of hip fracture and a major osteoporotic fracture using the country specific FRAX algorithm in men with type 2 diabetes mellitus]

PETHŐ Zsófia, KULCSÁR-JAKAB Éva, UGO Onyeka, MOLNÁR Zsuzsanna, KALINA Edit, BALOGH Ádám, PARAGH György, ANTAL-SZALMÁS Péter, KÁPLÁR Miklós, BHATTOA HARJIT Pál

[Objectives: Was to evaluate 10-year probability of hip fracture and a major osteoporotic fracture using the FRAX algorithm, vitamin D status, bone mineral density (BMD) and biochemical markers of bone turnover in men over 50 years of age with type 2 diabetes (T2DM). We compared FRAX-predicted 10-year fracture probability, levels of 25-hydroxyvitamin D (25-OH-D), markers of bone turnover and bone mineral density at L1-L4 (LS) and femur neck (FN) in 68 men with T2DM with an age- and gender-matched group (n=68). The mean (range) age of the T2DM group was 61.4 (51-78) years. The prevalence of hypovitaminosis D (25-OH-D <75 nmol/L) was 59%. The mean (range) FRAX hip fracture and FRAX major osteoporotic fracture was 0.7 (0-2.8)% and 3.2 (0-8.5)%, respectively. BMD at the FN (0.974 gm/cm2 vs. 0.915 gm/cm2; p = 0.008) and LS (1.221 gm/cm2 vs. 1.068 gm/cm2; p < 0.001) was significantly higher in the T2DM cohort as compared to the healthy age matched males. 25-OH-vitamin D (67.7 nmol/L vs.79.8 nmol/L; p < 0.001), crosslaps (0.19 μg/L vs. 0.24 μg/L; p = 0.004) and osteocalcin (13.3 μg/L vs. 15.7 μg/L; p = 0.004) were significantly lower in the T2DM group. There was no difference in FRAX-related fracture probability between the two groups. The increased BMD in T2DM and the lack of inclusion of T2DM as a risk factor in the FRAX algorithm are probable explanations for the discordance between literature-observed and FRAX-related fracture probabilities.]