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Belgrade, United States

Eggert K.,University of Marburg | Squillacote D.,Eisai Inc | Barone P.,University of Naples Federico II | Dodel R.,University of Bonn | And 15 more authors.
Movement Disorders

Perampanel, a novel, noncompetitive, selective AMPA-receptor antagonist demonstrated evidence of efficacy in reducing motor symptoms in animal models of Parkinson's disease (PD). We assessed the safety and efficacy of perampanel for treatment of "wearing off" motor fluctuations in patients with PD. Patients (N = 263) were randomly assigned to once-daily add-on 0.5, 1, or 2 mg of perampanel or placebo. The primary objective was to determine whether there was a dose-response relationship for efficacy among the 3 perampanel doses and placebo. The primary efficacy endpoint for each treatment was measured as the least-squares (LS) mean change from baseline to week 12 in percent "off' time reduction during the waking day, as recorded by patient diaries. The primary efficacy analysis was a 1-sided Williams test for dose-response trend at the 0.025 level of significance. At week 12, dose-response trends, as determined by the Williams test, were not statistically significant for LS mean reduction in percent "off" time during the waking day (P = 0.061, with significance defined as P ≤ 0.025). The 2 higher perampanel doses (ITT population; n = 258) produced non-significant reductions from baseline to week 12 in percent "off" time during the waking day versus placebo (7.59%, P = 0.421 [1 mg], 8.60%, P = 0.257 [2 mg] versus 5.05% [placebo]; significance for pairwise comparisons defined as P ≤ 0.05). There were no significant changes in dyskinesia or cognitive function in any perampanel group versus placebo. Adverse events were similar across treatment groups. Perampanel treatment was well tolerated and safe, but failed to achieve statistical significance in primary and secondary endpoints. © 2010 Movement Disorder Society. Source

Bajcetic M.,University of Belgrade | Brajovic M.,Clinical Hospital Center Zvezdara | Korkut-Tesic R.,Childrens Hospital Korkut Tesic
Journal of Medical Biochemistry

Pharmacotherapy of pediatric diseases represents a major challenge considering that the majority of medicines in everyday practice have not been pediatrically evaluated. The efficacy of therapy depends to a large extent on the knowledge of pathophysiological processes in the children organism at different ages. Therefore, research in that direction is of the utmost importance. An imbalance in the production of free oxygen/nitrogen species and parameters of antioxidative protection is a significant factor in many diseases (e.g. heart failure, pulmonary hypertension, asthma, neonatal sepsis, cancer etc.) in children of different age groups. Reactive oxygen/nitrogen species serve as cell signaling molecules for normal biologic processes. An increase in their generation can cause damages which can disrupt normal physiological cellular processes and eventually cause cell death. This review outlines the previous assessments of oxidative stress parameters in children of different ages for some diseases. Also, the potential diagnostic and therapeutic possibilities for the oxydative stress parameters in children have been considered. Source

Svetel M.,University of Belgrade | Smiljkovic T.,Clinical Hospital Center Zvezdara | Pekmezovic T.,University of Belgrade | Kostic V.,University of Belgrade
Acta Neurologica Belgica

The aim of this study was to estimate the prevalence and risk factors for the development of hallucinations in patients with Parkinson's disease (PD). This crosssectional study included 180 consecutive, non-demented patients with PD. Out of them, 24 patients (13%) experienced some kind of hallucinations. Visual hallucinations were present in 22/24 (90%) subjects. Univariate logistic regression analysis has shown relationship between presence of hallucinations and the following variables: age of patients (p = 0.025), PD duration (p = 0.001), duration of levodopa treatment (p = 0.001), total daily dose of levodopa (p = 0.033), presence of levodopa-induced dyskinesia (p = 0.002) and their duration (p = 0.021), and experience of nightmares (p = 0.042). Hallucinations were also associated with higher scores of the UPDRS (p = 0.001), HDRS (p = 0.001) and the NPI total score (p = 0.001), and higher H-Y stages of the disease (p = 0.001). Multivariate regression analysis has demonstrated that the duration of PD (p = 0.024) as well as NPI total score (p = 0.002) was significant independent risk factors for hallucinations in PD. © Belgian Neurological Society 2012. Source

Smiljkovic T.,Clinical Hospital Center Zvezdara
Srpski Arhiv za Celokupno Lekarstvo

Introduction: Sleep problems, common in Parkinson's disease (PD), are the consequence of the neurodegenerative process, as well as of neurochemical changes on one side, and of drug intake on the other side. Objective: To estimate the frequency of sleep problems and its correlation with the disease, therapy and demographic factors in patients with idiopathic Parkinson's disease. Methods: The study enrolled 65 consecutive patients who fulfilled criteria for idiopathic PD. The original questionnairewas performed to obtain demographic, disease and treatment data. The patients were tested with standardized scales: unified PD rating scale (UPDRS) and Hoehn and Yahr staging scale (HY scale). Mini mental stage examination (MMSE) was performed for the evaluation of cognitive status. Parkinson's disease sleep scale (PDSS) was applied for the assessment of sleep problems. Results: There were 37 male and 28 female patients. Negative correlations (p<0.01) were found between mean total PDSS and mean total UPDRS, as well as the mean scores of each part of UPDRS and HY stage. There was no difference in PDSS scores regarding gender. Analyzing each item in the PDSS scale, the lowest score was obtained for item 8 (nocturia). We did not find any difference in total PDSS scores between the patients on d-agonist and those who did not take d-agonist. Regarding amantadin, intake there were differences between groups for items concerning nocturnal motor symptoms. Conclusion: Patients in advanced stages of the disease and worse motility have more prominent sleep problems. Drug therapy has important impact on sleep quality in patients with PD. Source

Zugic A.,Serbian Institute for Medicinal Plant Research Dr Josif Pancic | Dordevic S.,Serbian Institute for Medicinal Plant Research Dr Josif Pancic | Arsic I.,University of Nis | Markovic G.,Clinical Hospital Center Zvezdara | And 3 more authors.
Industrial Crops and Products

There is a growing research interest on investigation of appropriate alternatives of natural origin to synthetic additives used in food products. The aim of this study was to investigate correlation of chemical composition of the best known biomarker plants from the locality of Vrujci Spa, Serbia with their antioxidant activity in vitro, in terms of their potential usage as feedstock materials in the food industry. Total phenolic (TP), total tannins (TT) and total flavonoid (TF) contents were determined using spectrophotometric methods. Qualitative and quantitative analyses of major phenolics by high-performance liquid chromatography (HPLC) were also used. Major phenolic acids identified in analyzed species were chlorogenic, caffeic and ferulic acid, while predominant flavonoids were flavonols (hyperoside, rutin, isoquercitrin, quercetin) and, in lesser extent flavones (luteolin, apigenin and their 7-O-glucosides). Vitexin 2-O″-rhamnoside was found only in Crataegus species. Antioxidant capacity was estimated by the following methods: 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) test and ferric reducing antioxidant power (FRAP). Majority of investigated plants had high levels of phenolics and exhibited noteworthy antioxidant activity. Moreover, a positive linear correlation was found between TP and TT with antioxidant capacities regarding both methods used. The plants showing the highest antioxidant activities were Veronica officinalis, Mentha pulegium and Fragaria vesca. Hypericum perforatum demonstrated by far the most potent antioxidant activity, as well as TP and TT content. Our results indicate that, in addition to their traditional usage in folk medicine, these plants represent a valuable source of natural antioxidants, and thus may be considered as great potential for the food industry, representing possible alternatives to synthetic additives. © 2013 Elsevier B.V. Source

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