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Lukas M, Kolar M, Reissigova J, Duricova D, Machkova N, Hruba V, Lukas M, Vasatko M, Jirsa J, Pudilova K, Malickova K. A switch from originator-adalimumab to the biosimilar SB5 in patients with Crohn's disease: an analysis of two propensity score-matched cohorts. Scand J Gastroenterol 2022; 57:814-824. [PMID: 35234552 DOI: 10.1080/00365521.2022.2041082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND/AIMS Originator-adalimumab, an established treatment for patients with Crohn's disease (CD), showed no difference in efficacy or adverse events versus adalimumab biosimilar SB5 (SB5-adalimumab) over 10 weeks (W) of treatment. To understand the long-term effectiveness of SB5-adalimumab in CD, patients switched from originator-adalimumab to SB5-adalimumab were compared with patients remaining on originator-adalimumab over 104 W. METHODS Data on patients aged ≥18 years, diagnosed with CD and treated at ISCARE, were collected prospectively from July 2018 to January 2021. Primary outcome: clinical disease activity at W52, measured by Harvey-Bradshaw index (HBI). Secondary outcomes: C-reactive protein (CRP), faecal calprotectin (FC) and adalimumab concentrations at W10, 26, 52 and 104, and treatment persistence. To ensure comparable cohorts, patients were propensity score (PS)-matched for age, gender and disease activity. RESULTS After matching, 54 patients remained per cohort. At W52, mean (SD) HBI score was 3.2 (2.5) for originator-adalimumab and 4.0 [3.6] for SB5-adalimumab (difference [95% CI] -0.78 [-2.8, 1.3]; n = 18/cohort); no clinically meaningful differences in CRP, FC or drug concentrations were noted. Kaplan-Meier's estimates (95% CI) of remaining on treatment were originator-adalimumab: 0.870 (0.785-0.965) versus SB5-adalimumab: 0.648 (0.533-0.789) at W52 and significantly lower for SB5-adalimumab versus originator-adalimumab (p < .001) over 104 W. Local skin reaction events/pain was the main reason for treatment discontinuation in the SB5-adalimumab cohort (n = 20/54 [37%]). CONCLUSIONS These long-term results of CD patients receiving originator-adalimumab or following nonmedical switch to SB5-adalimumab show similar therapeutic effects on clinical disease activity, biological parameters and pharmacokinetic profile in both cohorts from 52 to 104 W. A separation in persistence was observed beyond W26, mainly due to differences in local reactions at the injection site.
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Affiliation(s)
- M Lukas
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic.,First Medical Faculty, Charles University, Prague, Czech Republic
| | - M Kolar
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic
| | - J Reissigova
- Institute of Computer Science of the Czech Academy of Sciences, Prague, Czech Republic
| | - D Duricova
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic
| | - N Machkova
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic
| | - V Hruba
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic
| | - M Lukas
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic
| | - M Vasatko
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic
| | - J Jirsa
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic
| | - K Pudilova
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic
| | - K Malickova
- IBD Clinical and Research Centre, ISCARE a.s., Prague, Czech Republic.,First Medical Faculty, Charles University, Prague, Czech Republic
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Abstract
Summary
Differential graphical models are designed to represent the difference between the conditional dependence structures of two groups, and thus are of particular interest for scientific investigations. Motivated by modern applications, this manuscript considers an extended setting where each group is generated by a latent variable Gaussian graphical model. Due to the existence of latent factors, the differential network is decomposed into sparse and low-rank components, both of which are symmetric indefinite matrices. We estimate these two components simultaneously using a two-stage procedure: (i) an initialization stage, which computes a simple, consistent estimator, and (ii) a convergence stage, implemented using a projected alternating gradient descent algorithm applied to a nonconvex objective, initialized using the output of the first stage. We prove that given the initialization, the estimator converges linearly with a nontrivial, minimax optimal statistical error. Experiments on synthetic and real data illustrate that the proposed nonconvex procedure outperforms existing methods.
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Affiliation(s)
- S Na
- Department of Statistics, University of Chicago, 5747 South Ellis Avenue, Chicago, Illinois 60637, U.S.A
| | - M Kolar
- Booth School of Business, University of Chicago, 5807 South Woodlawn Avenue, Chicago, Illinois 60637, U.S.A
| | - O Koyejo
- Department of Computer Science, University of Illinois at Urbana-Champaign, 201 North Goodwin Avenue, Urbana, Illinois 61801, U.S.A
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Lukas M, Malickova K, Kolar M, Bortlik M, Vasatko M, Machkova N, Hruba V, Duricova D, Lukas M. Switching From Originator Adalimumab to the Biosimilar SB5 in Patients With Inflammatory Bowel Disease: Short-term Experience From a Single Tertiary Clinical Centre. J Crohns Colitis 2020; 14:915-919. [PMID: 31905382 DOI: 10.1093/ecco-jcc/jjaa001] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND AND AIMS Patients' perspectives after switching from originator to biosimilar adalimumab have yet to be assessed. We evaluated the efficacy of switching from the originator adalimumab to a biosimilar compound [SB5] in patients with inflammatory bowel disease [IBD]. METHODS Data on IBD patients who were switched from the originator to biosimilar adalimumab [SB5] at IBD Center ISCARE were analysed. Disease activity was assessed using standard clinical indices (Harvey-Bradshaw index [HBI] for Crohn's disease [CD] and partial Mayo score for ulcerative colitis [UC]), and laboratory parameters (C-reactive protein [CRP] and faecal calprotectin [FC]). Trough levels and anti-drug antibodies were measured. Patients were evaluated 10 weeks [W10] after the switch, and results were compared with the control group of patients on originator compound. RESULTS A total of 93 patients switched to biosimilar adalimumab were included [CD 86%] and were matched to 93 controls for age, gender, diagnosis, and disease activity. There was no difference in the disease activity in either SWITCH or ORIGINATOR cohorts between Weeks 0 and 10. Similarly, no difference was found between cohorts at both prespecified time points. Moreover, no significant differences in CRP or FC concentrations were seen between W0 and W10 either in the SWITCH, or in the ORIGINATOR cohort [p >0.05]. Adalimumab serum trough levels remained stable after the switch. No new safety signals were detected. CONCLUSIONS Our study confirmed that switching IBD patients from the originator adalimumab to a biosimilar compound [SB5] does not affect treatment efficacy.
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Affiliation(s)
- Martin Lukas
- Clinical and Research Centre for Inflammatory Bowel Disease, ISCARE, Prague, Czech Republic.,Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Libechov, Czech Republic
| | - K Malickova
- Clinical and Research Centre for Inflammatory Bowel Disease, ISCARE, Prague, Czech Republic.,Institute of Medical Biochemistry and Laboratory Medicine, General University Hospital and First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - M Kolar
- Clinical and Research Centre for Inflammatory Bowel Disease, ISCARE, Prague, Czech Republic.,Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Libechov, Czech Republic
| | - M Bortlik
- Clinical and Research Centre for Inflammatory Bowel Disease, ISCARE, Prague, Czech Republic.,Department of Internal Medicine, Military University Hospital and First Faculty of Medicine, Charles University, Prague, Czech Republic.,Institute of Pharmacology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - M Vasatko
- Clinical and Research Centre for Inflammatory Bowel Disease, ISCARE, Prague, Czech Republic
| | - N Machkova
- Clinical and Research Centre for Inflammatory Bowel Disease, ISCARE, Prague, Czech Republic
| | - V Hruba
- Clinical and Research Centre for Inflammatory Bowel Disease, ISCARE, Prague, Czech Republic
| | - D Duricova
- Clinical and Research Centre for Inflammatory Bowel Disease, ISCARE, Prague, Czech Republic.,Institute of Pharmacology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Milan Lukas
- Clinical and Research Centre for Inflammatory Bowel Disease, ISCARE, Prague, Czech Republic.,Institute of Medical Biochemistry and Laboratory Medicine, General University Hospital and First Faculty of Medicine, Charles University, Prague, Czech Republic
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Oravcova V, Kolar M, Literak I. Highly variable vancomycin-resistant enterococci in the north-eastern part of the Czech Republic. Lett Appl Microbiol 2019; 69:16-22. [DOI: 10.1111/lam.13121] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 12/18/2018] [Accepted: 01/16/2019] [Indexed: 12/19/2022]
Affiliation(s)
- V. Oravcova
- Department of Biology and Wildlife Diseases; Faculty of Veterinary Hygiene and Ecology; University of Veterinary and Pharmaceutical Sciences Brno; Brno Czech Republic
| | - M. Kolar
- Department of Microbiology; Faculty of Medicine and Dentistry; Palacký University Olomouc; Olomouc Czech Republic
| | - I. Literak
- Department of Biology and Wildlife Diseases; Faculty of Veterinary Hygiene and Ecology; University of Veterinary and Pharmaceutical Sciences Brno; Brno Czech Republic
- CEITEC VFU; University of Veterinary and Pharmaceutical Sciences Brno; Brno Czech Republic
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Balik M, Sedivy J, Waldauf P, Kolar M, Smejkalova V, Pachl J. Can Bioimpedance Determine the Volume of Distribution of Antibiotics in Sepsis? Anaesth Intensive Care 2019; 33:345-50. [PMID: 15973917 DOI: 10.1177/0310057x0503300310] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The relationship between the volume of distribution, assessed according to the two-compartmental pharmacokinetic model, and extracellular water estimated by bioimpedance was studied in mechanically ventilated patients with sepsis and capillary leak. A prospective observational study was performed in a twenty-bed general intensive care unit in the university hospital. Patients received either vancomycin (n=16) or netilmicin (n=12) for more than 48 hours. Those with ascites, pleural effusion, on renal replacement therapy or with haemodynamic instability were excluded. Serum concentrations of drugs were taken for pharmacokinetic analysis before, 1 hour and 4 hours after the 30 minute infusion. Bioimpedance measurement was performed at the time of the third sampling. The protocol was repeated after 24 hours. Fluid balance during the 24 hour interval was recorded. Extracellular water was increased and represented 45.6 to 46.6% of total body water. Fluid balance correlated with the change of extracellular water (r=0.82, P<0.0001) and total body water (r=0.74, P<0.0001). Volumes of distribution of vancomycin (0.677±0.339 l/kg) and netilmicin (0.505±0.172 l/kg) were increased compared to normal values. A correlation was demonstrated between volume of distribution (Vdarea) of vancomycin and extra cellular water/total body ratio (r=0.70, P<0.0001). The central compartment distribution volume (V1) of netilmicin correlated with extracellular water/total body water ratio (r=0.60, P<0.003). Serum concentrations above the recommended therapeutic range were detected in 81.2% of patients on vancomycin and in 50% of patients on netilmicin. Increased volumes of distribution can be estimated by the bioimpedance measurements but are not associated with requirements for higher dosage of the glycopeptide or aminoglycoside antibiotics.
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Affiliation(s)
- M Balik
- Department of Anaesthesia, University Hospital Kralovske Vinohrady, Srobarova, Prague, Czech Republic
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Kolar M, Nohejlova K, Duska F, Mares J, Pachl J. Changes of cortical perfusion in the early phase of subarachnoid bleeding in a rat model and the role of intracranial hypertension. Physiol Res 2018; 66:S545-S551. [PMID: 29355383 DOI: 10.33549/physiolres.933795] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Brain perfusion is reduced early after subarachnoid hemorrhage (SAH) due to intracranial hypertension and early vasospasm. The contribution of these two mechanisms is unknown. By performing a prophylactic decompressive craniectomy (DC) in a rat model of SAH we aimed to study brain perfusion after the component of intracranial hypertension has been eliminated. We used 2x2 factorial design, where rats received either decompressive craniectomy or sham operation followed by injection of 250 microl of blood or normal saline into prechiasmatic cistern. The cortical perfusion has been continually measured by laser speckle-contrast analysis for 30 min. Injection of blood caused a sudden increase of intracranial pressure (ICP) and drop of cerebral perfusion, which returned to baseline within 6 min. DC effectively prevented the rise of ICP, but brain perfusion after SAH was significantly lower and took longer to normalize compared to non-DC animals due to increased cerebral vascular resistance, which lasted throughout 30 min experimental period. Our findings suggest that intracranial hypertension plays dominant role in the very early hypoperfusion after SAH whilst the role of early vasospasm is only minor. Prophylactic DC effectively maintained cerebral perfusion pressure, but worsened cerebral perfusion by increased vascular resistance.
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Affiliation(s)
- M Kolar
- Department of Anesthesiology and Critical Care Medicine, Teaching Hospital Kralovske Vinohrady and Third Faculty of Medicine, Charles University, Prague, Czech Republic.
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Balagamwala E, Leyrer C, Tom M, Potemin S, Kolar M, Polkowski W, Sperk E, Wenz F, Suh J, Amarnath S, Rose P, Hull T, Chalikonda S, Mahdi H, Stephans K, Cherian S. EP-1534: International multi-institutional study of intraoperative radiotherapy for abdominopelvic tumors. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31843-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kolar M, Nohejlova K, Mares J, Pachl J. Early changes of brain perfusion after subarachnoid hemorrhage - the effect of sodium nitroprusside. Physiol Res 2017; 65:S591-S599. [PMID: 28006941 DOI: 10.33549/physiolres.933536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Causes of early hypoperfusion after subarachnoid hemorrhage (SAH) include intracranial hypertension as well as vasoconstriction. The aim of the study was to assess the effect of intracerebroventricular (ICV) administration of sodium nitroprusside (SNP) on early hypoperfusion after SAH. Male Wistar rats (220-240 g) were used, SAH group received 250 microl of fresh autologous arterial blood into the prechiasmatic cistern; sham-operated animals received 250 microl of isotonic solution. Therapeutic intervention: ICV administration of 10 microg SNP; 5 microl 5 % glucose (SNP vehicle) and untreated control. Brain perfusion and invasive blood pressure were monitored for 30 min during and after induction of SAH. Despite SNP caused increase of perfusion in sham-operated animals, no response was observed in half of SAH animals. The other half developed hypotension accompanied by brain hypoperfusion. There was no difference between brain perfusion in SNP-treated, glucose-treated and untreated SAH animals during the monitored period. We did not observe expected beneficial effect of ICV administration of SNP after SAH. Moreover, half of the SNP-treated animals developed serious hypotension which led to brain hypoperfusion. This is the important finding showing that this is not the option for early management in patient after SAH.
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Affiliation(s)
- M Kolar
- Department of Anesthesiology and Critical Care Medicine, Third Faculty of Medicine, Charles University, Prague, Czech Republic; Department of Normal, Pathological and Clinical Physiology, Third Faculty of Medicine, Charles University, Prague, Czech Republic.
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Kolar M, Duricova D, Bortlik M, Hruba V, Machkova N, Mitrova K, Malickova K, Lukas M, Lukas M. Infliximab Biosimilar (Remsima™) in Therapy of Inflammatory Bowel Diseases Patients: Experience from One Tertiary Inflammatory Bowel Diseases Centre. Dig Dis 2017; 35:91-100. [PMID: 28147356 DOI: 10.1159/000453343] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND The evidence on the efficacy and safety of biosimilar infliximab (IFX) in patients with inflammatory bowel diseases (IBD) is sparse. METHODS Consecutive IBD patients visiting our centre were included. One cohort composed of prospectively followed patients who were switched from original to biosimilar IFX between January and March 2015. The second cohort included retrospectively assessed anti-tumor necrosis factor α-naïve patients who started therapy between January 2015 and January 2016. Disease activity was assessed using standard clinical indices, endoscopic evaluation, and laboratory parameters (blood count, C-reactive protein (CRP) and fecal calprotectin (FC)). Trough levels and anti-drug antibodies (ATIs) were also measured. Patients were evaluated 56 weeks (W56) after switch and at week 14 (W14) and week 46 (W46) in the naïve cohort. RESULTS Seventy-four IBD patients were switched to biosimilar IFX and 119 naïve patients newly initiated therapy with the preparation. Disease activity remained stable in a majority of switched patients (remission at week 0 (W0) vs. W56: 72.2 vs. 77.8%; median difference of both Harvey-Bradshaw index and Simple Clinical Colitis Activity Index between W0 and W56 was 0). When W0 and W56 were compared, no significant difference in CRP (4.3 ± 8.0 vs. 3.3 ± 3.8 mg/l; p = 0.89) and FC (135 ± 153 vs. 199 ± 225 µg/g; p = 0.17) was observed. In total, 92% of Crohn's disease (CD) and 83% of ulcerative colitis (UC) patients responded to induction therapy (W14) with biosimilar IFX. At W46, the response rate was 86% in CD and 64% in UC. Moreover, half of UC patients experienced mucosal healing at W14 and improvement of perianal disease occurred in 95% of CD at W46. In this cohort, clear steroid-sparing effect was observed. No increase in immunogenicity was found in switched patients (ATI positivity: 9.5 vs. 6.0%, p = 0.54) and the type and frequency of adverse events were comparable to the original preparation in both cohorts. CONCLUSION Switching of IBD patients from original to biosimilar IFX is effective and safe.
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Affiliation(s)
- M Kolar
- IBD Clinical and Research Centre, ISCARE, Prague, Czech Republic
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Kolar M, Szwedowski R, Greskovich J, Xia P. SU-F-T-338: Flattening Filter Free Photon Beams Can Achieve the Same Plan Quality as Conventional Flattened Beams for Prostate Radiotherapy. Med Phys 2016. [DOI: 10.1118/1.4956523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Stechova K, Kolar M, Blatny R, Halbhuber Z, Vcelakova J, Hubackova M, Petruzelkova L, Sumnik Z, Obermannova B, Pithova P, Stavikova V, Krivjanska M, Neuwirth A, Kolouskova S, Filipp D. Healthy first-degree relatives of patients with type 1 diabetes exhibit significant differences in basal gene expression pattern of immunocompetent cells compared to controls: expression pattern as predeterminant of autoimmune diabetes. Scand J Immunol 2015; 75:210-9. [PMID: 21923738 DOI: 10.1111/j.1365-3083.2011.02637.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Expression features of genetic landscape which predispose an individual to the type 1 diabetes are poorly understood. We addressed this question by comparing gene expression profile of freshly isolated peripheral blood mononuclear cells isolated from either patients with type 1 diabetes (T1D), or their first-degree relatives or healthy controls. Our aim was to establish whether a distinct type of 'prodiabetogenic' gene expression pattern in the group of relatives of patients with T1D could be identified. Whole-genome expression profile of nine patients with T1D, their ten first-degree relatives and ten healthy controls was analysed using the human high-density expression microarray chip. Functional aspects of candidate genes were assessed using the MetaCore software. The highest number of differentially expressed genes (547) was found between the autoantibody-negative healthy relatives and the healthy controls. Some of them represent genes critically involved in the regulation of innate immune responses such as TLR signalling and CCR3 signalling in eosinophiles, humoral immune reactions such as BCR pathway, costimulation and cytokine responses mediated by CD137, CD40 and CD28 signalling and IL-1 proinflammatory pathway. Our data demonstrate that expression profile of healthy relatives of patients with T1D is clearly distinct from the pattern found in the healthy controls. That especially concerns differential activation status of genes and signalling pathways involved in proinflammatory processes and those of innate immunity and humoral reactivity. Thus, we posit that the study of the healthy relative's gene expression pattern is instrumental for the identification of novel markers associated with the development of diabetes.
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Affiliation(s)
- K Stechova
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - M Kolar
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - R Blatny
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - Z Halbhuber
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - J Vcelakova
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - M Hubackova
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - L Petruzelkova
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - Z Sumnik
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - B Obermannova
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - P Pithova
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - V Stavikova
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - M Krivjanska
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - A Neuwirth
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - S Kolouskova
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
| | - D Filipp
- Department of Paediatrics, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicLaboratory of Genomics and Bioinformatics, Institute of Molecular Genetics AS CR, Prague, Czech RepublicCentral European Biosystems, Prague, Czech RepublicDepartment of Internal Medicine, 2nd Medical Faculty of Charles University and University Hospital Motol, Prague, Czech RepublicDepartment of Immunobiology, Institute of Molecular Genetics, Czech Academy of Science, Prague, Czech Republic
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Kolar M, Mozetič M, Stana-Kleinschek K, Fröhlich M, Turk B, Vesel A. Covalent Binding of Heparin to Functionalized PET Materials for Improved Haemocompatibility. Materials (Basel) 2015; 8:1526-1544. [PMID: 28788016 PMCID: PMC5507051 DOI: 10.3390/ma8041526] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 01/19/2015] [Accepted: 03/20/2015] [Indexed: 11/16/2022]
Abstract
The hemocompatibility of vascular grafts made from poly(ethylene terephthalate) (PET) is insufficient due to the rapid adhesion and activation of blood platelets that occur upon incubation with whole blood. PET polymer was treated with NHx radicals created by passing ammonia through gaseous plasma formed by a microwave discharge, which allowed for functionalization with amino groups. X-ray photoelectron spectroscopy characterization using derivatization with 4-chlorobenzaldehyde indicated that approximately 4% of the –NH2 groups were associated with the PET surface after treatment with the gaseous radicals. The functionalized polymers were coated with an ultra-thin layer of heparin and incubated with fresh blood. The free-hemoglobin technique, which is based on the haemolysis of erythrocytes, indicated improved hemocompatibility, which was confirmed by imaging the samples using confocal optical microscopy. A significant decrease in number of adhered platelets was observed on such samples. Proliferation of both human umbilical vein endothelial cells and human microvascular endothelial cells was enhanced on treated polymers, especially after a few hours of cell seeding. Thus, the technique represents a promising substitute for wet-chemical modification of PET materials prior to coating with heparin.
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Affiliation(s)
- Metod Kolar
- Jozef Stefan International Postgraduate School, Jamova 39, Ljubljana 1000, Slovenia.
| | - Miran Mozetič
- Plasma Laboratory, Institute Jozef Stefan, Jamova 39, Ljubljana 1000, Slovenia.
| | - Karin Stana-Kleinschek
- Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, Maribor 2000, Slovenia.
| | - Mirjam Fröhlich
- Department of Biochemistry, Molecular and Structural Biology, Institute Jozef Stefan, Jamova 39, Ljubljana 1000, Slovenia.
- Educell Ltd., Prevale 9, Trzin 1236, Slovenia.
| | - Boris Turk
- Department of Biochemistry, Molecular and Structural Biology, Institute Jozef Stefan, Jamova 39, Ljubljana 1000, Slovenia.
| | - Alenka Vesel
- Plasma Laboratory, Institute Jozef Stefan, Jamova 39, Ljubljana 1000, Slovenia.
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Meier T, Suh J, Godley A, Hugebeck B, Barrett P, Kolar M, Chao S. A Rapid Large Increase in Patient Visits Can Compromise Quality and Safety in Radiation Oncology Treatment Delivery. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Wilkinson D, Kolar M. SU-E-T-546: Use of Implant Volume for Quality Assurance of Low Dose Rate Brachytherapy Treatment Plans. Med Phys 2014. [DOI: 10.1118/1.4888880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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15
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Vesel A, Kolar M, Stana-Kleinschek K, Mozetic M. Etching rates of blood proteins, blood plasma and polymer in oxygen afterglow of microwave plasma. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5394] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Alenka Vesel
- Plasma Laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
| | - Metod Kolar
- Jozef Stefan International Postgraduate School; Jamova 39 Ljubljana Slovenia
| | - Karin Stana-Kleinschek
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Miran Mozetic
- Plasma Laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
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16
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Hanulik V, Webber MA, Holy O, Roterva M, Kolar M. Epidemiology of Burkholderia multivorans strains obtained from non-cystic fibrosis patients isolated in large hospitals across the Czech Republic. J Hosp Infect 2013; 86:74-5. [PMID: 24309418 DOI: 10.1016/j.jhin.2013.10.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 10/04/2013] [Indexed: 11/29/2022]
Affiliation(s)
- V Hanulik
- Department of Microbiology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
| | - M A Webber
- Antimicrobial Agents Research Group, School of Immunity and Infection, Institute for Microbiology and Infection, University of Birmingham, Birmingham, UK.
| | - O Holy
- Department of Preventive Medicine, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
| | - M Roterva
- Department of Microbiology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
| | - M Kolar
- Department of Microbiology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
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17
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Yechieli R, Reddy C, Hunter G, Wilkinson D, Kolar M, Ciezki J. Segmental Analysis of Permanent Prostate Implant Dosimetry and Effects on Long-term Clinical Outcomes. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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18
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Jaganjac M, Vesel A, Milkovic L, Recek N, Kolar M, Zarkovic N, Latiff A, Kleinschek KS, Mozetic M. Oxygen-rich coating promotes binding of proteins and endothelialization of polyethylene terephthalate polymers. J Biomed Mater Res A 2013; 102:2305-14. [DOI: 10.1002/jbm.a.34911] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 07/21/2013] [Accepted: 08/07/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Morana Jaganjac
- Toxicology and Multipurpose; Anti Doping Lab Qatar; Doha State of Qatar
- Divison Molecular Medicine; Rudjer Boskovic Institute; 10000 Zagreb Croatia
| | - Alenka Vesel
- Plasma Laboratory; Jozef Stefan Institute; 1000 Ljubljana Slovenia
| | - Lidija Milkovic
- Divison Molecular Medicine; Rudjer Boskovic Institute; 10000 Zagreb Croatia
| | - Nina Recek
- Plasma Laboratory; Jozef Stefan Institute; 1000 Ljubljana Slovenia
| | - Metod Kolar
- Faculty of Mechanical Engineering, University of Maribor; 2000 Maribor Slovenia
| | - Neven Zarkovic
- Divison Molecular Medicine; Rudjer Boskovic Institute; 10000 Zagreb Croatia
| | - Aishah Latiff
- Toxicology and Multipurpose; Anti Doping Lab Qatar; Doha State of Qatar
| | | | - Miran Mozetic
- Plasma Laboratory; Jozef Stefan Institute; 1000 Ljubljana Slovenia
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19
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Wilkinson D, Kolar M. SU-E-T-225: Factors Influencing Point A Treatment Volume for Tandem/Ring Applicators. Med Phys 2013. [DOI: 10.1118/1.4814660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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20
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Hanulik V, Webber MA, Chroma M, Uvizl R, Holy O, Whitehead RN, Baugh S, Matouskova I, Kolar M. An outbreak of Burkholderia multivorans beyond cystic fibrosis patients. J Hosp Infect 2013; 84:248-51. [PMID: 23706672 DOI: 10.1016/j.jhin.2013.04.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 04/03/2013] [Indexed: 11/16/2022]
Abstract
Strains of the Burkholderia cepacia complex (Bcc) are opportunistic pathogens capable of causing serious infection in cystic fibrosis patients. Recently we identified a suspected outbreak of infection with Bcc strains at the University Hospital Olomouc. Seventy-four Bcc strains were isolated from 52 patients, most of whom (N = 48) did not suffer from cystic fibrosis. Most frequently (N = 46) Burkholderia multivorans was isolated and 24 (52.2%) of these strains were clonal. Fifteen of these strains were isolated from intensive care patients, five of whom died from hospital-acquired pneumonia. B. multivorans can cause serious outbreaks of infection beyond cystic fibrosis sufferers.
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Affiliation(s)
- V Hanulik
- Department of Microbiology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
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Meier T, Hugebeck B, Kovacs T, Belfi C, Suh J, Kolar M, Chao S. Continuous Quality Improvement in Radiation Oncology is Feasible at a Major Tertiary Teaching Institution. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Vesel A, Kolar M, Doliska A, Stana-Kleinschek K, Mozetic M. Etching of polyethylene terephthalate thin films by neutral oxygen atoms in the late flowing afterglow of oxygen plasma. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.5064] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alenka Vesel
- Plasma laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
| | - Metod Kolar
- Jozef Stefan International Postgraduate School; Jamova 39 Ljubljana Slovenia
| | - Ales Doliska
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Karin Stana-Kleinschek
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Miran Mozetic
- Plasma laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
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23
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Greskovich J, Kolar M, Godley A, Wilkinson A. PO-394 IMPROVED CTV DOSE HOMOGENEITY AND NORMAL TISSUE MAXIMUM DOSE FOR ESOPHAGEAL HDR USING A THREE TUBE TECHNIQUE. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)72360-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Kvitek L, Panacek A, Prucek R, Soukupova J, Vanickova M, Kolar M, Zboril R. Antibacterial activity and toxicity of silver – nanosilver versus ionic silver. ACTA ACUST UNITED AC 2011. [DOI: 10.1088/1742-6596/304/1/012029] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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25
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Wilkinson D, Kolar M. SU-D-214-03: Experience with Using Treatment Volume for Quality Assurance of HDR Treatment Plans. Med Phys 2011. [DOI: 10.1118/1.3611533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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26
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Doliška A, Vesel A, Kolar M, Stana-Kleinschek K, Mozetič M. Interaction between model poly(ethylene terephthalate) thin films and weakly ionised oxygen plasma. SURF INTERFACE ANAL 2011. [DOI: 10.1002/sia.3769] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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Nordmann P, Picazo JJ, Mutters R, Korten V, Quintana A, Laeuffer JM, Seak JCH, Flamm RK, Morrissey I, Azadian B, El-Bouri K, Jones G, Masterton B, Morgan M, Oppenheim B, Waghorn D, Smyth E, Abele-Horn M, Jacobs E, Mai U, Mutters R, Pfister W, Schoerner C, Seifert H, Bebear C, Bingen E, Bonnet R, Jehl F, Levy PY, Nordmann P, Delvallez MR, Paniara O, Papaparaskevas J, Piotr H, Kolar M, Zemlickova H, Hanzen J, Kotulova D, Campa M, Fadda G, Fortina G, Gesu G, Manso E, Milano F, Nicoletti G, Pucillo L, Rigoli R, Rossolini G, Sambri V, Sarti M, Akalin H, Sinirtas M, Akova M, Hascelik G, Arman D, Dizbay M, Aygen B, Sumerkan B, Dokuzoguz B, Esener H, Eraksoy H, Basaran S, Koksal I, Bayramoglu G, Korten V, Soyletir G, Ulusoy S, Tunger A, Yalcin AN, Ogunc D, Bou G, Bouza E, Canton R, Coll P, Garcia-Rodriguez JA, Gimeno C, Gobernado M, Bertomeu FG, Gomez-Garces JL, Marco F, Martinez-Martinez L, Pascual A, Perez JL, Picazo J, Prats G, Linares MS, Ghaly F, Cristino M, Diogo J, Ramos H, Balode A, Jurna-Ellam M, Koslov R. Comparative activity of carbapenem testing: the COMPACT study. J Antimicrob Chemother 2011; 66:1070-8. [DOI: 10.1093/jac/dkr056] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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28
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Krikava I, Kolar M, Garajova B, Balik T, Sevcikova A, Pachl J, Sevcik P, Trubac R. Polyhexanide anti-infective coating of central venous catheters in prevention of catheter colonization and bloodstream infection: Study HC-G-H-0507. Crit Care 2011. [PMCID: PMC3066903 DOI: 10.1186/cc9649] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
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29
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Stroes-Gascoyne S, Moir DL, Kolar M, Porth RJ, McConnell JL, Kerr AH. Measurement of Gap and Grain-Boundary Inventories of 129I Used in Candu Fuels. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-353-625] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractCombined gap and grain-boundary inventories of 129I in 14 used CANDU fuel elements were measured by crushing and simultaneously leaching fuel segments for 4 h in a solution containing KI carrier. From analogy with previous work a near one-to-one correlation vas anticipated between the amount of stable Xe and the amount of 129I in the combined gap and grain-boundary regions of the fuel. However, the results showed that such a correlation was only apparent for low linear power rating (LLPR) fuels with an average linear power rating of 642 kV/m. For high linear power rating (HLPR) fuels (>44 kw/m), the 129I values were considerably smaller than expected. The combined gap and grain-boundary inventories of 129I in the 14 fuels tested varied from 1.8 to 11.01, with an average value of 3.6 ± 2.4% which suggests that the average value of 8.1 ± 1% used in safety assessment calculations overestimates the instant release fraction for 129I. Segments of used CANDU fuels were leached for 92 d (samples taken at 5, 28 and 92 d) to determine the kinetics of 129I release. Results could be fitted tentatively to half-order reaction kinetics, implying that 129I release is a diffusion-controlled process for LLPR fuels, and also for HLPR fuels, once the gap inventory has been leached. However, more data are needed over longer leaching periods to gain more understanding of the processes that control grain-boundary release of 129I from used CANDU fuel.
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30
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Grmec Š, Lah K, Kolar M, Zadel S, Borovnik Lesjak V, Fafangel M. Partial pressure of end-tidal carbon-dioxide—Reliable criteria for termination of nontraumatic cardiac arrest resuscitative efforts in the field. Resuscitation 2010. [DOI: 10.1016/j.resuscitation.2010.09.113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Gajdos S, Kolar M, Xia P. SU-GG-I-115: Clinical Evaluation of Three Automatic Image Registration Algorithms from Two Commercial Systems. Med Phys 2010. [DOI: 10.1118/1.3468148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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32
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Krancevic B, Kolar M, Wilkinson D. SU-GG-T-75: Phantom Studies of Difficulties with Seed Detection Software Following I-125 Prostate Implants. Med Phys 2010. [DOI: 10.1118/1.3468461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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33
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Kolar M, Xia P. SU-GG-T-144: Dosimetric Effect of Using Non-Flat Photon Beam to Create Conventional Open Fields and Standard Phantom IMRT Plans. Med Phys 2010. [DOI: 10.1118/1.3468534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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34
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Wilkinson D, Kolar M, Juliano J. TU-D-BRB-02: Failure Modes and Effects Analysis Applied to HDR Treatment Planning. Med Phys 2010. [DOI: 10.1118/1.3469251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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35
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Hradil P, Hlavac J, Soural M, Hajduch M, Kolar M, Vecerova R. 3-Hydroxy-2-phenyl-4(1H)-quinolinones as Promising Biologically Active Compounds. Mini Rev Med Chem 2009; 9:696-702. [DOI: 10.2174/138955709788452720] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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36
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Bardon J, Kolar M, Cekanova L, Hejnar P, Koukalova D. Prevalence of Campylobacter jejuni and its resistance to antibiotics in poultry in the Czech Republic. Zoonoses Public Health 2008; 56:111-6. [PMID: 18771516 DOI: 10.1111/j.1863-2378.2008.01176.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Thermotolerant Campylobacter spp., in particular Campylobacter jejuni, are among the most frequently identified pathogens, found to be causing human gastrointestinal infections in Europe, with the Czech Republic being no exception. The presented work aimed at assessing results of the first nationwide monitoring of prevalence and antibiotic resistance of Campylobacter spp. in broiler flocks in the Czech Republic, including a comparison of antibiotic resistance of C. jejuni isolates collected from poultry and the human community. The monitoring was carried out in poultry slaughterhouses in 2006 and 2007. From broilers, cloacal swabs were collected and examined. The human isolates of C. jejuni were acquired from rectal swabs in community patients with diarrhoeal diseases. Suspected isolates of both animal and human origin were confirmed by the PCR methods. Antibiotic resistance to selected anti-microbial agents was tested by the microdilution method. In the monitored period, the prevalence of thermotolerant Campylobacter spp. in broilers in the Czech Republic reached almost 50%. In 2006, C. jejuni was detected in 46% and Campylobacter coli in 3% of the tested samples. In 2007, C. jejuni was found in 43% and C. coli in 2% of the samples. The results of anti-microbial susceptibility testing of C. jejuni showed higher resistance in animals when compared with humans. The only exception was tetracycline with higher resistance in isolates of human origin. The highest resistance detected was to quinolone antibiotics. Resistance to oxolinic acid was 77% in animal and 60% in human isolates, to ciprofloxacin 72% in isolates from poultry and 55% in those from humans. In ampicillin, 26% of poultry isolates and 16% of human isolates were resistant. Moreover, 9% of animal isolates demonstrated resistance to streptomycin, undetected in human isolates. In erythromycin, resistance was found in 6% of poultry and 1% of human isolates.
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Affiliation(s)
- J Bardon
- National Reference Laboratory for Campylobacter, State Veterinary Institute Olomouc, Czech Republic.
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37
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Angelov L, Chao S, Heng D, Djemil T, Kolar M, Suh J. Stereotactic Spine Radiosurgery (SRS) for Pain and Tumor Control in Patients with Spinal Metastases from Renal Cell Carcinoma: A Prospective Study. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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38
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Wilkinson DA, Kolar M, Fleming PA, Singh AD. Dosimetric comparison of 106Ru and 125I plaques for treatment of shallow (<or=5 mm) choroidal melanoma lesions. Br J Radiol 2008; 81:784-9. [PMID: 18628320 DOI: 10.1259/bjr/76813976] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The aim of this study was to compare dosimetric parameters between iodine-125 ((125)I) and ruthenium-106 ((106)Ru) plaques of similar sizes in the treatment of choroidal melanomas. The study design included retrospective double planning of each case. 26 consecutive patients with choroidal melanomas measuring 5 mm or less in thickness were included. Dose distributions were calculated using Plaque Simulator treatment-planning software for a prescription of 85 Gy to the tumour apex. Doses to the outer sclera, lens, fovea and optic disc were obtained for each case using appropriately sized plaques of each isotope. Statistical inferences were made using the non-parametric Wilcoxon signed rank test. The mean dose to the macula, disc and lens was 18%, 53% and 89% less, respectively, with (106)Ru than with (125)I. Scleral doses were greater for (106)Ru. The use of collaborative ocular melanoma study dosimetry results in even higher mean doses to the macula, disc, lens and sclera. Two-dimensional dose distributions and dose volume histograms demonstrated the increase in dose outside the tumour volume using (125)I. This comparison shows that, for tumours not exceeding 5 mm in thickness, the use of (106)Ru plaques has the potential to reduce the radiation dose to nearby normal structures and possibly lower the risk of radiation-induced visual loss.
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Affiliation(s)
- D A Wilkinson
- Department of Radiation Oncology, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.
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39
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Bardon J, Kolar M, Sauer P, Koukalova D, Petrzelova J, Cekanova L. R2137 First report of methicillin-resistant Staphylococcus aureus strain of animal provenience in the Czech Republic. Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)71976-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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40
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Kolar M, Latal T, Cermak P, Bartonikova N, Chmelarova E, Sauer P, Kesselova M. Prevalence of extended-spectrum β-lactamase-positive Klebsiella pneumoniae isolates in the Czech Republic. Int J Antimicrob Agents 2006; 28:49-53. [PMID: 16769203 DOI: 10.1016/j.ijantimicag.2006.02.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2005] [Accepted: 02/03/2006] [Indexed: 10/24/2022]
Abstract
This study focused on the prevalence and molecular biology of extended-spectrum beta-lactamase (ESBL)-positive Klebsiella pneumoniae isolates collected in the Czech Republic. Clinical material from patients hospitalised in 16 Czech hospitals in September 2004 was used to isolate K. pneumoniae strains. Strains were identified by standard identification procedures. Susceptibility of the strains to antibiotics was tested using a microdilution method. The double-disk synergy test and combination disk method were used to determine ESBL production. Molecular biology characteristics of ESBL-positive isolates were determined using genomic DNA isolation, XbaI restriction digestion and pulsed-field gel electrophoresis differentiation. The acquired restriction maps of individual isolates were compared using GelCompar II software and their relationships were determined. During the 3-week period, 483 K. pneumoniae strains causing clinically detectable diseases were isolated. Of these, 117 (24.2%) were determined to be ESBL-positive. The prevalence of ESBL-positive isolates was 38.9% in Intensive Care Units (ICUs) and 13.1% in standard wards. More than 50% of ESBL-positive isolates were treated effectively only with meropenem (98%), cefoperazone/sulbactam (61%) and amikacin (54%). Conversely, ESBL-negative isolates showed high susceptibility to all tested antibiotics (76-99%). Molecular biology analysis identified 18 clonal types containing two to six identical isolates. Seventeen clones usually contained isolates from only one hospital; isolates from two hospitals were identified only in one clone. Based on the abovementioned results, the prevalence of ESBL-positive K. pneumoniae isolates in the Czech Republic can be perceived as relatively high, especially in ICUs. Extensive spread of 'epidemic clones' within Czech hospitals and, to a limited extent, between them can be demonstrated.
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Affiliation(s)
- M Kolar
- Institute of Microbiology, Faculty of Medicine, Palacký University, Hnevotinska 3, 775 15 Olomouc, Czech Republic.
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Kolar M, Pantucek R, Vagnerova I, Kesselova M, Sauer P, Matouskova I, Doskar J, Koukalova D, Hejnar P. Genotypic characterisation of vancomycin-resistant Enterococcus faecium isolates from haemato-oncological patients at Olomouc University Hospital, Czech Republic. Clin Microbiol Infect 2006; 12:353-60. [PMID: 16524412 DOI: 10.1111/j.1469-0691.2006.01365.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study describes the first molecular characterisation of clinical isolates of vancomycin-resistant enterococci (VRE) in the Czech Republic. Of 2647 patient isolates of Enterococcus spp. from 1997-2002, 121 (4.6%) were identified as VRE. The most common isolates were VanA+ Enterococcus faecium (78%) and VanB+ Enterococcus faecalis (10%). In addition, five VanA+ E. faecium isolates were obtained from environmental and staff sampling. Macrorestriction analysis of SmaI restriction fragment length polymorphism was performed for 54 VanA+ E. faecium clinical isolates and the five VanA+ E. faecium environmental isolates. Thirty-two unique restriction endonuclease patterns were identified, including two predominant clonal types represented by five or more isolates. Two environmental VanA+ E. faecium isolates were closely related to two patient isolates, which had an identical SmaI macrorestriction pattern. The results indicated potential survival of strains in the hospital environment and possible subsequent transmission to hospitalised patients.
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Affiliation(s)
- M Kolar
- Department of Microbiology, Faculty of Medicine, Palacky University, Olomouc, Czech Republic.
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Abstract
BACKGROUND Several studies have documented the influence of antibiotic selective pressure, mainly from the use of glycopeptides, third-generation cephalosporins, quinolones and lincosamides, on the frequency of vancomycin-resistant enterococci (VRE) occurrence in hospitals. The aim of this study was to evaluate the relationship between VRE occurrence and antibiotic use in the Department of Hemato-Oncology of the Teaching Hospital in Olomouc (DHO), Czech Republic, over a 6-year period under standard and unchanged hygienic and epidemiological conditions. METHODS During the period of 1998-2003, Enterococcus sp. strains and VRE were isolated by standard methods from clinical samples taken from DHO in-patients. The frequency of VRE occurrence was expressed as the number of isolated strains per 100 bed-days/year. DHO antibiotic consumption data were processed according to the anatomical therapeutic chemical (ATC)/defined daily dose (DDD) system valid in 2003 and expressed in defined daily dose per 100 bed-days (DDD/100 bed-days) for each year of the period. RESULTS Since 1998, the occurrence of VRE decreased significantly (from 0.28 to 0.17 VRE/100 bed-days in 2001). Between 2001 and 2003, a significant (P < 0.05) increase from 0.17 to 0.38 was observed. The antibiotic use decreased from 205.2 in 1998 to 161.0 DDD/100 bed-days in 1999 and after an increase in 2001 (to 181.8 DDD/100 bed-days) it remained relatively stable. A significant decrease was observed in third-generation cephalosporins and quinolones (from 29.5 to 9.7 and from 42.2 to 30.2 DDD/100 bed-days respectively) between 1998 and 1999. In 2002-2003, the use of third-generation cephalosporins and glycopeptides increased substantially (from 10.1 to 13.9 and from 11.3 to 15.2 DDD/100 bed-days respectively). The Pearson correlation value was significantly positive (P < 0.05) for VRE occurrence and the use of glycopeptides and third-generation cephalosporins. CONCLUSIONS While our study confirms the effect of use of glycopeptides and third-generation cephalosporins on occurrence of VRE, no influence of quinolones and lincosamides over the 6-year period was shown.
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Affiliation(s)
- M Kolar
- Department of Microbiology, Medical Faculty, Palacky University, Hnĕvotínská 3, 775-15 Olomouc, Czech Republic.
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Abstract
Urinary tract infection in babies often presents with non specific symptoms and signs. It must be considered in the differential diagnosis of a febrile sick baby or any baby with failure to thrive. In a significant proportion of babies with recurrent urinary tract infection, urological abnormality is demonstrable. The diagnosis of urinary tract infection is confirmed by the presence of pus cells and growth of microorganism in a fresh urine specimen. The voidoing history and detailed ultrasound examination in the baby including a post void evaluation of the upper and lower urinary tract can lead to the possible diagnosis in the majority. Antibiotic therapy for urinary tract infection should be followed by consideration about the need for urinary drainage at the appropriate level, particularly in cases where resolution is delayed despite antibiotics. There is a role for prophylactic antibiotics after the resolution of acute infection, at least until detailed evaluation several weeks after the acute episode, has excluded any abnormality. Micturating cytourethrogram is usually done under antibiotic cover and better done in centres with facility for fluoroscopic examination. Isotope studies have to be evaluated in the light of inherent limitations. Transient urodynamic abnormality of the urinary bladder in infancy is being increasingly recognized and should be the subject of evaluation in specific circumstances. A multidisciplinary team improves the quality of investigations, subsequent interpretation and long term care of these children. A large majority of urological abnormality in infancy and early childhood can be effectively managed by endocopic procedures. Temporary urinary diversion may be required in a small proportion. Urological reconstruction should be approached with caution, after a detailed analysis of the evolving urological tract in a baby. An aggressive approach to early diagnosis and appropriate treatment of urinary tract infection and any underlying abnormality, has been shown to significantly reduce the incidence of chronic renal failure in long term longitudinal studies in children.
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Affiliation(s)
- S K Chowdhary
- Division of Pediatric Urology, Prince of Wales University Hospital, Shatin, Hong Kong S.A.R.
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Büttner A, Latarnik S, Rode S, Remer H, Kolar M, Bennefeld H, Rühle KH. Die Vigilanz bei schlafbezogenen und neurologischen Krankheitsbildern. Pneumologie 2004. [DOI: 10.1055/s-2004-828910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Abstract
In Austria additional in-patient treatment facilities for psychosomatic patients are currently established. In this context an advisory board of the planned psychosomatic clinics suggests to develop a network for psychosomatics and psychotherapy. This suggestion focuses on four goals: further integration of specialised psychosomatic care into general medical care; further promotion of general psychosomatic care in primary health care; increasing acceptance of psychotherapy among psychosomatic patients in need of psychotherapeutic interventions; decreasing the number of chronic psychosomatic disorders by early and adequate treatment. The proposed network should involve three levels of cooperation: the primary care level, the specialised psychosomatic-psychotherapeutic level and the institutional level of planning future structural developments according to the actual needs and demands. Such a network should also facilitate a common approach regarding the admission of patients, in-patient treatment and post-treatment care. A need inventory and an implementation analysis involving all levels of cooperation as well as the patients perspective are regarded as a prerequisite for the implementation of the network.
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Affiliation(s)
- Ch Fazekas
- Universitätsklinik für Medizinische Psychologie und Psychotherapie, Karl-Franzens-Universität Graz.
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Kolar M, Dobcnik D. Chemically prepared silver electrode for determination of N-acetyl-L-cysteine by flow-injection potentiometry. Pharmazie 2003; 58:25-8. [PMID: 12622248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
This paper describes the use of the silver electrode by means of chemical pretreatment of the electrode surface with mercuric(II) chloride solution and potassium iodide solution in flow injection analysis (FIA). The electrode is used as a potentiometric sensor for the indirect determination of NAC in a carrier stream containing iodine. A one-channel flow system that consists of a peristaltic pump, injection valve, a silver wire electrode and a saturated calomel reference electrode (SCE) was used. Some typical FIA parameters such as flow rate, tube length and composition of the carrier stream were varied. The electrode is further characterised by a constant linear response within the concentration range for NAC between 4.0 x 10(-6) and 1.0 x 10(-3) M at the slope of 60.6 +/- 1.0 mV/p(NAC). Some pharmaceutical products containing NAC were also tested. These results can be compared to the results obtained by the direct potentiometric titrations with silver nitrate and are also in good agreement with values declared by pharmaceutical manufacturers.
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Affiliation(s)
- M Kolar
- Faculty of Chemistry and Chemical Engineering, University of Maribor, Slovenia.
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Kolar M, Vagnerova I, Latal T, Urbanek K, Typovska H, Hubacek J, Papajik T, Raida L, Faber E. The occurrence of vancomycin-resistant enterococci in hematological patients in relation to antibiotic use. New Microbiol 2002; 25:205-12. [PMID: 12019727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Very important bacterial pathogens found in hematological patients at present are vancomycin-resistant enterococci (VRE). The main goal of this retrospective study was to assess their occurrence in relation to antibiotic use. We isolated 1918 Enterococcus strains, in toto, 138 (7.2%) of which proved to be VRE. The VRE most frequently identified were Enterococcus faecium VanA (77%) and Enterococcusfaecalis VanB (12%), mostly isolated from stools (57%). Comparing the development of the selection pressure of antibiotics and percentage of VRE in each period of observation, an effect of the administration of each antibiotic group on the occurrence of VRE can be presumed. A reduction in the administration of third generation cephalosporins, glycopeptides and fluoroquinolones and its replacement by penicillin antibiotics combined with inhibitors of bacterial beta-lactamases, contributed to the cessation of VRE incidence and succeeding reduced occurrence from 15.1% in the second half of 1998 to 6.1% in the first half of 2000.
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Affiliation(s)
- M Kolar
- Department of Microbiology, Faculty of Medicine, Palackỳ University Olomouc, Czech Republic
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Kolar M, Dobcnik D, Radić N. Potentiometric flow-injection determination of vitamin C and glutathione with a chemically prepared tubular silver electrode. Pharmazie 2000; 55:913-6. [PMID: 11189866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
This paper describes the preparation and use of a tubular electrode by means of chemical pretreatment of a silver tube with mercuric (II) chloride solution and iodide solution in flow injection analysis (FIA). The electrode was used as a potentiometric sensor for the indirect determination of vitamin C and glutathione in a carrier stream containing iodine. A simple FIA system that consists of a peristaltic pump, an injection T valve, a tubular silver electrode and a saturated calomel reference electrode (SCE) was used. Some typical FIA parameters such as flow rate, tube length, sample volume and composition of the carrier stream were varied. After optimisation of these parameters, the electrode was further characterised by a constant linear response within the concentration range for the vitamin C between 5 x 10(-5) and 5 x 10(-3) M at the slope of 60.5 +/- 1.0 mV/p (vitamin C). Glutathione has a linear concentration range between 5 x 10(-5) and 10(-2) M at a slope of 55.2 +/- 1.0 mV/p (glutathione). The experimental slope was in good agreement with the theoretical values. Some pharmaceutical products containing vitamin C were also tested. These results can be compared to the results obtained by the standard volumetric method for the determination of vitamin C and are also in good agreement with values declared by pharmaceutical manufacturers.
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Affiliation(s)
- M Kolar
- Faculty of Chemistry and Chemical Engineering, University of Maribor, Slovenia
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Balik M, Kazda A, Kolar M, Hendl A. The combination of lactate and bicarbonate buffers in continuous venovenous hemodiafiltration and its impact on serum lactate levels and homeostasis. Crit Care 2000. [PMCID: PMC3332965 DOI: 10.1186/cc761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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