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Wiessler AL, Hasenmüller AS, Fuhl I, Mille C, Cortes Campo O, Reinhard N, Schenk J, Heinze KG, Schaefer N, Specht CG, Villmann C. Role of the Glycine Receptor β Subunit in Synaptic Localization and Pathogenicity in Severe Startle Disease. J Neurosci 2024; 44:e0837232023. [PMID: 37963764 PMCID: PMC10860499 DOI: 10.1523/jneurosci.0837-23.2023] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 09/20/2023] [Accepted: 10/16/2023] [Indexed: 11/16/2023] Open
Abstract
Startle disease is due to the disruption of recurrent inhibition in the spinal cord. Most common causes are genetic variants in genes (GLRA1, GLRB) encoding inhibitory glycine receptor (GlyR) subunits. The adult GlyR is a heteropentameric complex composed of α1 and β subunits that localizes at postsynaptic sites and replaces embryonically expressed GlyRα2 homomers. The human GlyR variants of GLRA1 and GLRB, dominant and recessive, have been intensively studied in vitro. However, the role of unaffected GlyRβ, essential for synaptic GlyR localization, in the presence of mutated GlyRα1 in vivo is not fully understood. Here, we used knock-in mice expressing endogenous mEos4b-tagged GlyRβ that were crossed with mouse Glra1 startle disease mutants. We explored the role of GlyRβ under disease conditions in mice carrying a missense mutation (shaky) or resulting from the loss of GlyRα1 (oscillator). Interestingly, synaptic targeting of GlyRβ was largely unaffected in both mouse mutants. While synaptic morphology appears unaltered in shaky animals, synapses were notably smaller in homozygous oscillator animals. Hence, GlyRβ enables transport of functionally impaired GlyRα1 missense variants to synaptic sites in shaky animals, which has an impact on the efficacy of possible compensatory mechanisms. The observed enhanced GlyRα2 expression in oscillator animals points to a compensation by other GlyRα subunits. However, trafficking of GlyRα2β complexes to synaptic sites remains functionally insufficient, and homozygous oscillator mice still die at 3 weeks after birth. Thus, both functional and structural deficits can affect glycinergic neurotransmission in severe startle disease, eliciting different compensatory mechanisms in vivo.
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Affiliation(s)
- Anna-Lena Wiessler
- Institute for Clinical Neurobiology, University Hospital, Julius-Maximilians-University of Würzburg, 97078 Würzburg, Germany
| | - Ann-Sofie Hasenmüller
- Institute for Clinical Neurobiology, University Hospital, Julius-Maximilians-University of Würzburg, 97078 Würzburg, Germany
| | - Isabell Fuhl
- Institute for Clinical Neurobiology, University Hospital, Julius-Maximilians-University of Würzburg, 97078 Würzburg, Germany
| | - Clémence Mille
- Institut National de la Santé et de la Recherche Médicale (Inserm U1195), Université Paris-Saclay, 94276 Le Kremlin-Bicêtre, France
| | - Orlando Cortes Campo
- Institute for Clinical Neurobiology, University Hospital, Julius-Maximilians-University of Würzburg, 97078 Würzburg, Germany
| | - Nicola Reinhard
- Institute for Clinical Neurobiology, University Hospital, Julius-Maximilians-University of Würzburg, 97078 Würzburg, Germany
| | - Joachim Schenk
- Rudolf Virchow Center for Integrative and Translational Bioimaging, Julius-Maximilians-University of Würzburg, 97080 Würzburg, Germany
| | - Katrin G Heinze
- Rudolf Virchow Center for Integrative and Translational Bioimaging, Julius-Maximilians-University of Würzburg, 97080 Würzburg, Germany
| | - Natascha Schaefer
- Institute for Clinical Neurobiology, University Hospital, Julius-Maximilians-University of Würzburg, 97078 Würzburg, Germany
| | - Christian G Specht
- Institut National de la Santé et de la Recherche Médicale (Inserm U1195), Université Paris-Saclay, 94276 Le Kremlin-Bicêtre, France
| | - Carmen Villmann
- Institute for Clinical Neurobiology, University Hospital, Julius-Maximilians-University of Würzburg, 97078 Würzburg, Germany
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Esser TU, Anspach A, Muenzebrock KA, Kah D, Schrüfer S, Schenk J, Heinze KG, Schubert DW, Fabry B, Engel FB. Direct 3D-Bioprinting of hiPSC-Derived Cardiomyocytes to Generate Functional Cardiac Tissues. Adv Mater 2023; 35:e2305911. [PMID: 37655652 DOI: 10.1002/adma.202305911] [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] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/18/2023] [Indexed: 09/02/2023]
Abstract
3D-bioprinting is a promising technology to produce human tissues as drug screening tool or for organ repair. However, direct printing of living cells has proven difficult. Here, a method is presented to directly 3D-bioprint human induced pluripotent stem cell (hiPSC)-derived cardiomyocytes embedded in a collagen-hyaluronic acid ink, generating centimeter-sized functional ring- and ventricle-shaped cardiac tissues in an accurate and reproducible manner. The printed tissues contain hiPSC-derived cardiomyocytes with well-organized sarcomeres and exhibit spontaneous and regular contractions, which persist for several months and are able to contract against passive resistance. Importantly, beating frequencies of the printed cardiac tissues can be modulated by pharmacological stimulation. This approach opens up new possibilities for generating complex functional cardiac tissues as models for advanced drug screening or as tissue grafts for organ repair or replacement.
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Affiliation(s)
- Tilman U Esser
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Annalise Anspach
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Katrin A Muenzebrock
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Delf Kah
- Department of Physics, University of Erlangen-Nuremberg, 91052, Erlangen, Germany
| | - Stefan Schrüfer
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Joachim Schenk
- Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, Julius-Maximilians-Universität Würzburg (JMU), 97080, Würzburg, Germany
| | - Katrin G Heinze
- Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, Julius-Maximilians-Universität Würzburg (JMU), 97080, Würzburg, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Ben Fabry
- Department of Physics, University of Erlangen-Nuremberg, 91052, Erlangen, Germany
| | - Felix B Engel
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
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Appeltshauser L, Linke J, Heil HS, Karus C, Schenk J, Hemmen K, Sommer C, Doppler K, Heinze KG. Super-resolution imaging pinpoints the periodic ultrastructure at the human node of Ranvier and its disruption in patients with polyneuropathy. Neurobiol Dis 2023; 182:106139. [PMID: 37146836 DOI: 10.1016/j.nbd.2023.106139] [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] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 04/13/2023] [Accepted: 04/25/2023] [Indexed: 05/07/2023] Open
Abstract
The node of Ranvier is the key element in saltatory conduction along myelinated axons, but its specific protein organization remains elusive in the human species. To shed light on nanoscale anatomy of the human node of Ranvier in health and disease, we assessed human nerve biopsies of patients with polyneuropathy by super-resolution fluorescence microscopy. We applied direct stochastic optical reconstruction microscopy (dSTORM) and supported our data by high-content confocal imaging combined with deep learning-based analysis. As a result, we revealed a ~ 190 nm periodic protein arrangement of cytoskeletal proteins and axoglial cell adhesion molecules in human peripheral nerves. In patients with polyneuropathy, periodic distances increased at the paranodal region of the node of Ranvier, both at the axonal cytoskeleton and at the axoglial junction. In-depth image analysis revealed a partial loss of proteins of the axoglial complex (Caspr-1, neurofascin-155) in combination with detachment from the cytoskeletal anchor protein ß2-spectrin. High content analysis showed that such paranodal disorganization occurred especially in acute and severe axonal neuropathy with ongoing Wallerian degeneration and related cytoskeletal damage. We provide nanoscale and protein-specific evidence for the prominent, but vulnerable role of the node of Ranvier for axonal integrity. Furthermore, we show that super-resolution imaging can identify, quantify and map elongated periodic protein distances and protein interaction in histopathological tissue samples. We thus introduce a promising tool for further translational applications of super resolution microscopy.
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Affiliation(s)
| | - Janis Linke
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany; Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Hannah S Heil
- Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany; Optical Cell Biology, Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - Christine Karus
- Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Joachim Schenk
- Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Katherina Hemmen
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany
| | - Claudia Sommer
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany
| | - Kathrin Doppler
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany.
| | - Katrin G Heinze
- Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany.
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Schenk J, van der Ven WH, Schuurmans J, Roerhorst S, Cherpanath TGV, Lagrand WK, Thoral P, Elbers PWG, Tuinman PR, Scheeren TWL, Bakker J, Geerts BF, Veelo DP, Paulus F, Vlaar APJ. Definition and incidence of hypotension in intensive care unit patients, an international survey of the European Society of Intensive Care Medicine. J Crit Care 2021; 65:142-148. [PMID: 34148010 DOI: 10.1016/j.jcrc.2021.05.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/16/2021] [Accepted: 05/25/2021] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Although hypotension in ICU patients is associated with adverse outcome, currently used definitions are unknown and no universally accepted definition exists. METHODS We conducted an international, peer-reviewed survey among ICU physicians and nurses to provide insight in currently used definitions, estimations of incidence, and duration of hypotension. RESULTS Out of 1394 respondents (1055 physicians (76%) and 339 nurses (24%)), 1207 (82%) completed the questionnaire. In all patient categories, hypotension definitions were predominantly based on an absolute MAP of 65 mmHg, except for the neuro(trauma) category (75 mmHg, p < 0.001), without differences between answers from physicians and nurses. Hypotension incidence was estimated at 55%, and time per day spent in hypotension at 15%, both with nurses reporting higher percentages than physicians (estimated mean difference 5%, p = 0.01; and 4%, p < 0.001). CONCLUSIONS An absolute MAP threshold of 65 mmHg is most frequently used to define hypotension in ICU patients. In neuro(trauma) patients a higher threshold was reported. The majority of ICU patients are estimated to endure hypotension during their ICU admission for a considerable amount of time, with nurses reporting a higher estimated incidence and time spent in hypotension than physicians.
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Affiliation(s)
- J Schenk
- Amsterdam UMC, University of Amsterdam, Department of Anesthesiology, Meibergdreef 9, Amsterdam, Netherlands
| | - W H van der Ven
- Amsterdam UMC, University of Amsterdam, Department of Anesthesiology, Meibergdreef 9, Amsterdam, Netherlands
| | - J Schuurmans
- Amsterdam UMC, University of Amsterdam, Department of Intensive Care, Meibergdreef 9, Amsterdam, Netherlands
| | - S Roerhorst
- Amsterdam UMC, University of Amsterdam, Department of Anesthesiology, Meibergdreef 9, Amsterdam, Netherlands
| | - T G V Cherpanath
- Amsterdam UMC, University of Amsterdam, Department of Intensive Care, Meibergdreef 9, Amsterdam, Netherlands
| | - W K Lagrand
- Amsterdam UMC, University of Amsterdam, Department of Intensive Care, Meibergdreef 9, Amsterdam, Netherlands
| | - P Thoral
- Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Intensive Care, Laboratory for Critical Care Computational Intelligence, Amsterdam Medical Data Science, Amsterdam Cardiovascular Science, Amsterdam Infection and Immunity, de Boelelaan 1117, Amsterdam, Netherlands
| | - P W G Elbers
- Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Intensive Care, Laboratory for Critical Care Computational Intelligence, Amsterdam Medical Data Science, Amsterdam Cardiovascular Science, Amsterdam Infection and Immunity, de Boelelaan 1117, Amsterdam, Netherlands
| | - P R Tuinman
- Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Intensive Care, Laboratory for Critical Care Computational Intelligence, Amsterdam Medical Data Science, Amsterdam Cardiovascular Science, Amsterdam Infection and Immunity, de Boelelaan 1117, Amsterdam, Netherlands
| | - T W L Scheeren
- University Medical Center Groningen, University of Groningen, Department of Anesthesiology, Groningen, Netherlands
| | - J Bakker
- New York University Langone Medical Center, New York University Langone Health, Department of Pulmonary and Critical Care, New York, USA; Columbia University Medical Center, Columbia University, Department of Pulmonology and Critical Care, New York, USA; Erasmus MC University Medical Center, Erasmus University, Department of Intensive Care, Rotterdam, Netherlands; Hospital Clínico Pontificia Universidad Católica de Chile, Pontificia Universidad Católica de Chile, Departamento de Medicina Intensiva, Santiago, Chile
| | - B F Geerts
- Amsterdam UMC, University of Amsterdam, Department of Anesthesiology, Meibergdreef 9, Amsterdam, Netherlands
| | - D P Veelo
- Amsterdam UMC, University of Amsterdam, Department of Anesthesiology, Meibergdreef 9, Amsterdam, Netherlands
| | - F Paulus
- Amsterdam UMC, University of Amsterdam, Department of Intensive Care, Meibergdreef 9, Amsterdam, Netherlands; Amsterdam UMC, University of Amsterdam, Laboratory of Experimental Intensive Care and Anesthesiology, Meibergdreef 9, Amsterdam, Netherlands
| | - A P J Vlaar
- Amsterdam UMC, University of Amsterdam, Department of Intensive Care, Meibergdreef 9, Amsterdam, Netherlands; Amsterdam UMC, University of Amsterdam, Laboratory of Experimental Intensive Care and Anesthesiology, Meibergdreef 9, Amsterdam, Netherlands.
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Sagova-Mareckova M, Boenigk J, Bouchez A, Cermakova K, Chonova T, Cordier T, Eisendle U, Elersek T, Fazi S, Fleituch T, Frühe L, Gajdosova M, Graupner N, Haegerbaeumer A, Kelly AM, Kopecky J, Leese F, Nõges P, Orlic S, Panksep K, Pawlowski J, Petrusek A, Piggott JJ, Rusch JC, Salis R, Schenk J, Simek K, Stovicek A, Strand DA, Vasquez MI, Vrålstad T, Zlatkovic S, Zupancic M, Stoeck T. Expanding ecological assessment by integrating microorganisms into routine freshwater biomonitoring. Water Res 2021; 191:116767. [PMID: 33418487 DOI: 10.1016/j.watres.2020.116767] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 12/14/2020] [Accepted: 12/19/2020] [Indexed: 06/12/2023]
Abstract
Bioindication has become an indispensable part of water quality monitoring in most countries of the world, with the presence and abundance of bioindicator taxa, mostly multicellular eukaryotes, used for biotic indices. In contrast, microbes (bacteria, archaea and protists) are seldom used as bioindicators in routine assessments, although they have been recognized for their importance in environmental processes. Recently, the use of molecular methods has revealed unexpected diversity within known functional groups and novel metabolic pathways that are particularly important in energy and nutrient cycling. In various habitats, microbial communities respond to eutrophication, metals, and natural or anthropogenic organic pollutants through changes in diversity and function. In this review, we evaluated the common trends in these changes, documenting that they have value as bioindicators and can be used not only for monitoring but also for improving our understanding of the major processes in lotic and lentic environments. Current knowledge provides a solid foundation for exploiting microbial taxa, community structures and diversity, as well as functional genes, in novel monitoring programs. These microbial community measures can also be combined into biotic indices, improving the resolution of individual bioindicators. Here, we assess particular molecular approaches complemented by advanced bioinformatic analysis, as these are the most promising with respect to detailed bioindication value. We conclude that microbial community dynamics are a missing link important for our understanding of rapid changes in the structure and function of aquatic ecosystems, and should be addressed in the future environmental monitoring of freshwater ecosystems.
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Affiliation(s)
- M Sagova-Mareckova
- Dept. of Microbiology, Nutrition and Dietetics, Czech University of Life Sciences, Kamýcká 129, Prague 6, 16500, Czechia.
| | - J Boenigk
- Biodiversity, University of Duisburg-Essen, Universitaetsstraße 5, 45141 Essen, Germany
| | - A Bouchez
- UMR CARRTEL, INRAE, UMR Carrtel, 75 av. de Corzent, FR-74203 Thonon les Bains cedex, France; University Savoie Mont-Blanc, UMR CARRTEL, FR-73370 Le Bourget du Lac, France
| | - K Cermakova
- ID-Gene Ecodiagnostics, Campus Biotech Innovation Park, 15, av. Sécheron, 1202 Geneva, Switzerland
| | - T Chonova
- UMR CARRTEL, INRAE, UMR Carrtel, 75 av. de Corzent, FR-74203 Thonon les Bains cedex, France; University Savoie Mont-Blanc, UMR CARRTEL, FR-73370 Le Bourget du Lac, France
| | - T Cordier
- Department of Genetics and Evolution, University of Geneva, Science III, 4 Boulevard d'Yvoy, 1205 Geneva, Switzerland
| | - U Eisendle
- University of Salzburg, Hellbrunnerstraße 34, 5020 Salzburg, Austria
| | - T Elersek
- National Institute of Biology, Vecna pot 111, SI-1000 Ljubljana, Slovenia
| | - S Fazi
- Water Research Institute, National Research Council of Italy (IRSA-CNR), Via Salaria km 29,300 - C.P. 10, 00015 Monterotondo St., Rome, Italy
| | - T Fleituch
- Institute of Nature Conservation, Polish Academy of Sciences, ul. Adama Mickiewicza 33, 31-120 Krakow, Poland
| | - L Frühe
- Ecology Group, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
| | - M Gajdosova
- Dept. of Ecology, Faculty of Science, Charles University, Viničná 7, 12844 Prague, Czechia
| | - N Graupner
- Biodiversity, University of Duisburg-Essen, Universitaetsstraße 5, 45141 Essen, Germany
| | - A Haegerbaeumer
- Dept. of Animal Ecology, Bielefeld University, Konsequenz 45, 33615 Bielefeld, Germany
| | - A-M Kelly
- School of Natural Sciences, Trinity College Dublin, University of Dublin, College Green, Dublin 2, D02 PN40, Ireland
| | - J Kopecky
- Epidemiology and Ecology of Microoganisms, Crop Research Institute, Drnovská 507, 16106 Prague 6, Czechia
| | - F Leese
- Biodiversity, University of Duisburg-Essen, Universitaetsstraße 5, 45141 Essen, Germany; Aquatic Ecosystem Resarch, University of Duisburg-Essen, Universitaetsstrasse 5 D-45141 Essen, Germany
| | - P Nõges
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51006, Estonia
| | - S Orlic
- Institute Ruđer Bošković, Bijenička 54, 10000 Zagreb, Croatia; Center of Excellence for Science and Technology Integrating Mediterranean, Bijenička 54,10 000 Zagreb, Croatia
| | - K Panksep
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51006, Estonia
| | - J Pawlowski
- ID-Gene Ecodiagnostics, Campus Biotech Innovation Park, 15, av. Sécheron, 1202 Geneva, Switzerland; Department of Genetics and Evolution, University of Geneva, Science III, 4 Boulevard d'Yvoy, 1205 Geneva, Switzerland; Institute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712 Sopot, Poland
| | - A Petrusek
- Dept. of Ecology, Faculty of Science, Charles University, Viničná 7, 12844 Prague, Czechia
| | - J J Piggott
- School of Natural Sciences, Trinity College Dublin, University of Dublin, College Green, Dublin 2, D02 PN40, Ireland
| | - J C Rusch
- Norwegian Veterinary Institute, P.O. Box 750, Sentrum, NO-0106 Oslo, Norway; Department of Biosciences, University of Oslo, P.O. Box 1066, Blindern, NO-0316 Oslo, Norway
| | - R Salis
- Department of Biology, Faculty of Science, Lund University, Sölvegatan 37, 223 62 Lund, Sweden
| | - J Schenk
- Dept. of Animal Ecology, Bielefeld University, Konsequenz 45, 33615 Bielefeld, Germany
| | - K Simek
- Institute of Hydrobiology, Biology Centre CAS, Branišovská 31, 370 05 České Budějovice, Czechia
| | - A Stovicek
- Dept. of Microbiology, Nutrition and Dietetics, Czech University of Life Sciences, Kamýcká 129, Prague 6, 16500, Czechia
| | - D A Strand
- Norwegian Veterinary Institute, P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
| | - M I Vasquez
- Department of Chemical Engineering, Cyprus University of Technology, 30 Arch. Kyprianos Str., 3036 Limassol, Cyprus
| | - T Vrålstad
- Norwegian Veterinary Institute, P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
| | - S Zlatkovic
- Ministry of Environmental Protection, Omladinskih brigada 1, 11070 Belgrade, Serbia; Agency "Akvatorija", 11. krajiške divizije 49, 11090 Belgrade, Serbia
| | - M Zupancic
- National Institute of Biology, Vecna pot 111, SI-1000 Ljubljana, Slovenia
| | - T Stoeck
- Ecology Group, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
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Wijnberge M, Schenk J, Bulle E, Vlaar AP, Maheshwari K, Hollmann MW, Binnekade JM, Geerts BF, Veelo DP. Association of intraoperative hypotension with postoperative morbidity and mortality: systematic review and meta-analysis. BJS Open 2021; 5:6073395. [PMID: 33609377 PMCID: PMC7893468 DOI: 10.1093/bjsopen/zraa018] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 09/07/2020] [Indexed: 12/21/2022] Open
Abstract
Background Intraoperative hypotension, with varying definitions in literature, may be associated with postoperative complications. The aim of this meta-analysis was to assess the association of intraoperative hypotension with postoperative morbidity and mortality. Methods MEDLINE, Embase and Cochrane databases were searched for studies published between January 1990 and August 2018. The primary endpoints were postoperative overall morbidity and mortality. Secondary endpoints were postoperative cardiac outcomes, acute kidney injury, stroke, delirium, surgical outcomes and combined outcomes. Subgroup analyses, sensitivity analyses and a meta-regression were performed to test the robustness of the results and to explore heterogeneity. Results The search identified 2931 studies, of which 29 were included in the meta-analysis, consisting of 130 862 patients. Intraoperative hypotension was associated with an increased risk of morbidity (odds ratio (OR) 2.08, 95 per cent confidence interval 1.56 to 2.77) and mortality (OR 1.94, 1.32 to 2.84). In the secondary analyses, intraoperative hypotension was associated with cardiac complications (OR 2.44, 1.52 to 3.93) and acute kidney injury (OR 2.69, 1.31 to 5.55). Overall heterogeneity was high, with an I2 value of 88 per cent. When hypotension severity, outcome severity and study population variables were added to the meta-regression, heterogeneity was reduced to 50 per cent. Conclusion Intraoperative hypotension during non-cardiac surgery is associated with postoperative cardiac and renal morbidity, and mortality. A universally accepted standard definition of hypotension would facilitate further research into this topic.
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Affiliation(s)
- M Wijnberge
- Department of Anaesthesiology, Amsterdam University Medical Centre, Amsterdam, the Netherlands.,Department of Intensive Care, Amsterdam University Medical Centre, Amsterdam, the Netherlands.,Laboratory of Experimental Intensive Care and Anaesthesiology, Amsterdam University Medical Centre, Amsterdam, the Netherlands
| | - J Schenk
- Department of Anaesthesiology, Amsterdam University Medical Centre, Amsterdam, the Netherlands
| | - E Bulle
- Department of Anaesthesiology, Amsterdam University Medical Centre, Amsterdam, the Netherlands.,Department of Intensive Care, Amsterdam University Medical Centre, Amsterdam, the Netherlands
| | - A P Vlaar
- Department of Intensive Care, Amsterdam University Medical Centre, Amsterdam, the Netherlands.,Laboratory of Experimental Intensive Care and Anaesthesiology, Amsterdam University Medical Centre, Amsterdam, the Netherlands
| | - K Maheshwari
- Department of General Anaesthesiology, Outcomes Research, Anaesthesiology Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - M W Hollmann
- Department of Anaesthesiology, Amsterdam University Medical Centre, Amsterdam, the Netherlands.,Laboratory of Experimental Intensive Care and Anaesthesiology, Amsterdam University Medical Centre, Amsterdam, the Netherlands
| | - J M Binnekade
- Department of Intensive Care, Amsterdam University Medical Centre, Amsterdam, the Netherlands
| | - B F Geerts
- Department of Anaesthesiology, Amsterdam University Medical Centre, Amsterdam, the Netherlands
| | - D P Veelo
- Department of Anaesthesiology, Amsterdam University Medical Centre, Amsterdam, the Netherlands
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7
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Schwärzel LS, Jungmann AM, Schmoll N, Seiler F, Muellenbach RM, Schenk J, Dinh QT, Bals R, Lepper PM, Omlor AJ. A mock circulation loop to test extracorporeal CO 2 elimination setups. Intensive Care Med Exp 2020; 8:52. [PMID: 32915322 PMCID: PMC7484925 DOI: 10.1186/s40635-020-00341-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 09/02/2020] [Indexed: 01/01/2023] Open
Abstract
Background Extracorporeal carbon dioxide removal (ECCO2R) is a promising yet limited researched therapy for hypercapnic respiratory failure in acute respiratory distress syndrome and exacerbated chronic obstructive pulmonary disease. Herein, we describe a new mock circuit that enables experimental ECCO2R research without animal models. In a second step, we use this model to investigate three experimental scenarios of ECCO2R: (I) the influence of hemoglobin concentration on CO2 removal. (II) a potentially portable ECCO2R that uses air instead of oxygen, (III) a low-flow ECCO2R that achieves effective CO2 clearance by recirculation and acidification of the limited blood volume of a small dual lumen cannula (such as a dialysis catheter). Results With the presented ECCO2R mock, CO2 removal rates comparable to previous studies were obtained. The mock works with either fresh porcine blood or diluted expired human packed red blood cells. However, fresh porcine blood was preferred because of better handling and availability. In the second step of this work, hemoglobin concentration was identified as an important factor for CO2 removal. In the second scenario, an air-driven ECCO2R setup showed only a slightly lower CO2 wash-out than the same setup with pure oxygen as sweep gas. In the last scenario, the low-flow ECCO2R, the blood flow at the test membrane lung was successfully raised with a recirculation channel without the need to increase cannula flow. Low recirculation ratios resulted in increased efficiency, while high recirculation ratios caused slightly reduced CO2 removal rates. Acidification of the CO2 depleted blood in the recirculation channel caused an increase in CO2 removal rate. Conclusions We demonstrate a simple and cost effective, yet powerful, “in-vitro” ECCO2R model that can be used as an alternative to animal experiments for many research scenarios. Moreover, in our approach parameters such as hemoglobin level can be modified more easily than in animal models.
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Affiliation(s)
- Leonie S Schwärzel
- Department of Internal Medicine V - Pneumology and Intensive Care Medicine, University Hospital of Saarland, Kirrbergerstr. 1, 66421, Homburg, Germany
| | - Anna M Jungmann
- Department of Internal Medicine V - Pneumology and Intensive Care Medicine, University Hospital of Saarland, Kirrbergerstr. 1, 66421, Homburg, Germany
| | - Nicole Schmoll
- Department of Internal Medicine V - Pneumology and Intensive Care Medicine, University Hospital of Saarland, Kirrbergerstr. 1, 66421, Homburg, Germany
| | - Frederik Seiler
- Department of Internal Medicine V - Pneumology and Intensive Care Medicine, University Hospital of Saarland, Kirrbergerstr. 1, 66421, Homburg, Germany
| | - Ralf M Muellenbach
- Department of Anaesthesiology and Critical Care, Campus Kassel of the University of Southampton, Kassel, Germany
| | - Joachim Schenk
- Department of Transfusion Medicine and Hemostaseology, University Hospital of Saarland, Homburg, Germany
| | - Quoc Thai Dinh
- Department of Internal Medicine V - Pneumology and Intensive Care Medicine, University Hospital of Saarland, Kirrbergerstr. 1, 66421, Homburg, Germany
| | - Robert Bals
- Department of Internal Medicine V - Pneumology and Intensive Care Medicine, University Hospital of Saarland, Kirrbergerstr. 1, 66421, Homburg, Germany
| | - Philipp M Lepper
- Department of Internal Medicine V - Pneumology and Intensive Care Medicine, University Hospital of Saarland, Kirrbergerstr. 1, 66421, Homburg, Germany.
| | - Albert J Omlor
- Department of Internal Medicine V - Pneumology and Intensive Care Medicine, University Hospital of Saarland, Kirrbergerstr. 1, 66421, Homburg, Germany
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Wijnberge M, Schenk J, Terwindt LE, Mulder MP, Hollmann MW, Vlaar AP, Veelo DP, Geerts BF. The use of a machine-learning algorithm that predicts hypotension during surgery in combination with personalized treatment guidance: study protocol for a randomized clinical trial. Trials 2019; 20:582. [PMID: 31601239 PMCID: PMC6788048 DOI: 10.1186/s13063-019-3637-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 08/08/2019] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Intraoperative hypotension is associated with increased morbidity and mortality. Current treatment is mostly reactive. The Hypotension Prediction Index (HPI) algorithm is able to predict hypotension minutes before the blood pressure actually decreases. Internal and external validation of this algorithm has shown good sensitivity and specificity. We hypothesize that the use of this algorithm in combination with a personalized treatment protocol will reduce the time weighted average (TWA) in hypotension during surgery spent in hypotension intraoperatively. METHODS/DESIGN We aim to include 100 adult patients undergoing non-cardiac surgery with an anticipated duration of more than 2 h, necessitating the use of an arterial line, and an intraoperatively targeted mean arterial pressure (MAP) of > 65 mmHg. This study is divided into two parts; in phase A baseline TWA data from 40 patients will be collected prospectively. A device (HemoSphere) with HPI software will be connected but fully covered. Phase B is designed as a single-center, randomized controlled trial were 60 patients will be randomized with computer-generated blocks of four, six or eight, with an allocation ratio of 1:1. In the intervention arm the HemoSphere with HPI will be used to guide treatment; in the control arm the HemoSphere with HPI software will be connected but fully covered. The primary outcome is the TWA in hypotension during surgery. DISCUSSION The aim of this trial is to explore whether the use of a machine-learning algorithm intraoperatively can result in less hypotension. To test this, the treating anesthesiologist will need to change treatment behavior from reactive to proactive. TRIAL REGISTRATION This trial has been registered with the NIH, U.S. National Library of Medicine at ClinicalTrials.gov, ID: NCT03376347 . The trial was submitted on 4 November 2017 and accepted for registration on 18 December 2017.
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Affiliation(s)
- M Wijnberge
- Department of Anesthesiology, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Meibergdreef 9, Postbus 22660, 1105 AZ, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Meibergdreef 9, Postbus 22660, 1105 AZ, Amsterdam, The Netherlands
| | - J Schenk
- Department of Anesthesiology, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Meibergdreef 9, Postbus 22660, 1105 AZ, Amsterdam, The Netherlands
| | - L E Terwindt
- Department of Anesthesiology, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Meibergdreef 9, Postbus 22660, 1105 AZ, Amsterdam, The Netherlands
| | - M P Mulder
- Department of Anesthesiology, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Meibergdreef 9, Postbus 22660, 1105 AZ, Amsterdam, The Netherlands.,Department of Technical Medicine, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - M W Hollmann
- Department of Anesthesiology, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Meibergdreef 9, Postbus 22660, 1105 AZ, Amsterdam, The Netherlands
| | - A P Vlaar
- Department of Intensive Care Medicine, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Meibergdreef 9, Postbus 22660, 1105 AZ, Amsterdam, The Netherlands
| | - D P Veelo
- Department of Anesthesiology, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Meibergdreef 9, Postbus 22660, 1105 AZ, Amsterdam, The Netherlands.
| | - B F Geerts
- Department of Anesthesiology, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Meibergdreef 9, Postbus 22660, 1105 AZ, Amsterdam, The Netherlands
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9
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Wolf H, Vogel H, Römling L, Schenk J, Lukasczik M. Implementierung und formative Evaluation eines Gesundheitslotsen zur Beratung von Gesundheitsgästen in einem Kurort. Psychother Psychosom Med Psychol 2018. [DOI: 10.1055/s-0038-1668023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- H Wolf
- Universität Würzburg, Abteilung für Medizinische Psychologie, Würzburg, Deutschland
| | - H Vogel
- Universität Würzburg, Abteilung für Medizinische Psychologie, Würzburg, Deutschland
| | - L Römling
- Universität Würzburg, Abteilung für Medizinische Psychologie, Würzburg, Deutschland
| | - J Schenk
- Universität Würzburg, Abteilung für Medizinische Psychologie, Würzburg, Deutschland
| | - M Lukasczik
- Universität Würzburg, Abteilung für Medizinische Psychologie, Würzburg, Deutschland
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10
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Franke K, Richter W, Steiniger F, Seyfert U, Schenk J, Treuner J, Haberbosch W, Eisert R, Barthels M, Meyer M. New molecular defects in the γ subdomain of fibrinogen D-domain in four cases of (hypo)dysfibrinogenemia: fibrinogen variants Hannover VI, Homburg VII, Stuttgart and Suhl. Thromb Haemost 2017. [DOI: 10.1055/s-0037-1613585] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
SummaryFour new molecular abnormalities in the γ subdomain of the D domain elucidated in three unrelated thrombophilic patients and in one asymptomatic case of hypofibrinogenemia are reported: fibrinogen Suhl, γ 326,Cys →Tyr, fibrinogen Hannover VI, γ 336 Met →Ile, fibrinogen Stuttgart, γ 345, Asn→Asp and fibrinogen Homburg VII, γ354,Tyr→Cys. In all cases, fibrin polymerization in plasma is impaired. In the case of fibrinogen Suhl, there was a normalization of fibrin polymerization in plasma at higher Ca2+ concentration. The protective effect of Ca2+ on plasmic degradation of fibrinogen was incomplete with all three variants. The fibrinogen molecules in variants Homburg VII and Suhl contain covalently bound albumin. Fibrin clot structure was abnormal in case of variant Homburg VII, with finer and more branched fibers forming a less porous clot. Experimental data indicate possible effects of the molecular abnormalities on Ca2+-binding, D-E interaction and lateral association of protofibrils.
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11
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Schenk J, Jelusic D, Wittmann M, Schultz K, Schuler M. Erfassung von Angst bei COPD – Faktorielle Validität und Messinvarianz über die Zeit des Generalized Anxiety Disorder Questionnaire (GAD-7). Pneumologie 2017. [DOI: 10.1055/s-0037-1598581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- J Schenk
- Abteilung für Medizinische Psychologie und Psychotherapie, Medizinische Soziologie und Rehabilitationswissenschaften, Universität Würzburg
| | - D Jelusic
- Klinik Bad Reichenhall der Drv Bayern Süd
| | - M Wittmann
- Klinik Bad Reichenhall der Drv Bayern Süd
| | - K Schultz
- Klinik Bad Reichenhall der Drv Bayern Süd
| | - M Schuler
- Abteilung für Medizinische Psychologie und Psychotherapie, Medizinische Soziologie und Rehabilitationswissenschaften, Universität Würzburg
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12
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Schenk J. Elastografie bei Kindern. ROFO-FORTSCHR RONTG 2015. [DOI: 10.1055/s-0035-1551140] [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: 10/23/2022]
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13
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Kaestner F, Coulee L, Bedersdorfer M, Kaiser R, Böhmer P, Linn O, Trudzinski F, Tauchnitz M, Seiler F, Alqudrah M, Langer F, Klingele M, Wilkens H, Fähndrich S, Schenk J, Bals R, Lepper PM. Transfusion von Blutprodukten und Substitution von Gerinnungsfaktoren während ECMO bei Patienten im Lungenversagen. Pneumologie 2015. [DOI: 10.1055/s-0035-1544707] [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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Kaestner F, Coulee L, Bedersdorfer M, Kaiser R, Böhmer P, Linn O, Trudzinski F, Tauchnitz M, Seiler F, Alqudrah M, Schenk J, Wilkens H, Langer F, Fähndrich S, Klingele M, Bals R, Lepper PM. ECMO-Therapie bei akutem Lungenversagen: Entwicklung der Bilirubinwerte und deren Einfluss auf die Mortalität. Pneumologie 2015. [DOI: 10.1055/s-0035-1544703] [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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15
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Moeller L, Lehnig M, Schenk J, Zehnsdorf A. Foam formation in biogas plants caused by anaerobic digestion of sugar beet. Bioresour Technol 2015; 178:270-277. [PMID: 25446785 DOI: 10.1016/j.biortech.2014.09.098] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 09/18/2014] [Accepted: 09/19/2014] [Indexed: 06/04/2023]
Abstract
The use of sugar beet in anaerobic digestion (AD) during biogas production can lead to process upsets such as excessive foaming in fermenters. In the present study, foam formation in sugar beet-fed digestates was studied in foaming tests. The increasing disintegration grade of sugar beet was observed to have a promoting effect on foaming in the digestate but did not affect the biogas yield. Chemical analysis of foam and digestate from sugar beet silage AD showed high concentrations of pectin, other carbohydrates and N-containing substances in the foam. Both pectin and sucrose showed little foaming in AD. Nevertheless, sucrose and calcium chloride had a promoting effect on foaming for pectin AD. Salts of divalent ions also enhanced the foam intensity in the case of sugar beet silage AD, whereas ammonium chloride and urea had a lessening effect on sugar beet-based foaming.
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Affiliation(s)
- Lucie Moeller
- UFZ - Helmholtz Centre for Environmental Research, Centre for Environmental Biotechnology, Permoserstrasse 15, 04318 Leipzig, Germany.
| | - Marcus Lehnig
- Leipzig University of Applied Sciences, Koburger Strasse 62, D-04416 Markkleeberg, Germany.
| | - Joachim Schenk
- Leipzig University of Applied Sciences, Koburger Strasse 62, D-04416 Markkleeberg, Germany.
| | - Andreas Zehnsdorf
- UFZ - Helmholtz Centre for Environmental Research, Centre for Environmental Biotechnology, Permoserstrasse 15, 04318 Leipzig, Germany.
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Birschmann I, Klamroth R, Eichler H, Schenk J, Kirchmaier CM, Halimeh S. Results of the WIRK prospective, non-interventional observational study of recombinant activated factor VII (rFVIIa) in patients with congenital haemophilia with inhibitors and other bleeding disorders. Haemophilia 2013; 19:679-85. [DOI: 10.1111/hae.12156] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/02/2013] [Indexed: 12/01/2022]
Affiliation(s)
- I. Birschmann
- Institute for Laboratory and Transfusion Medicine; Heart and Diabetes Center; Ruhr University Bochum; Bad Oeynhausen; Germany
| | - R. Klamroth
- Department of Internal Medicine - Angiology; Haemostasis and Coagulation Disorders; Vivantes Hospital im Friedrichshain; Berlin; Germany
| | - H. Eichler
- Institute of Clinical Hemostaseology and Transfusion Medicine; Saarland University Hospital; Homburg/Saar; Germany
| | - J. Schenk
- Institute of Clinical Hemostaseology and Transfusion Medicine; Saarland University Hospital; Homburg/Saar; Germany
| | - C. M. Kirchmaier
- Section Internal Medicine I - Angiology and Haemostaseology; German Diagnostic Clinic; Wiesbaden; Germany
| | - S. Halimeh
- Coagulation Centre Rhine-Ruhr, Outpatient and Specialist Laboratory for Coagulation Disorders/Haemophilia; Duisburg; Germany
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Jenelten U, Helling C, Both S, Schenk J, Strube J. Model-based Design of Plant-based Extraction Processes. CHEM-ING-TECH 2012. [DOI: 10.1002/cite.201250542] [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: 11/10/2022]
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18
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Kassing M, Jenelten U, Schenk J, Hänsch R, Strube J. Combination of Rigorous and Statistical Modeling for Process Development of Plant-Based Extractions Based on Mass Balances and Biological Aspects. Chem Eng Technol 2011. [DOI: 10.1002/ceat.201100268] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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Dupuy A, Athes V, Schenk J, Jenelten U, Souchon I. Experimental and theoretical considerations on breakthrough pressure in membrane-based solvent extraction: Focus on citrus essential oil/hydro-alcoholic solvent systems with low interfacial tension. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2011.05.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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20
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Dupuy A, Athes V, Schenk J, Jenelten U, Souchon I. Solvent extraction of highly valuable oxygenated terpenes from lemon essential oil using a polypropylene membrane contactor: potential and limitations. FLAVOUR FRAG J 2011. [DOI: 10.1002/ffj.2052] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- A. Dupuy
- UMR 782 Laboratoire de Génie et Microbiologie des Procédés Alimentaires AgroParistech, INRA; 78850; Thiverval Grignon; France
| | - V. Athes
- UMR 782 Laboratoire de Génie et Microbiologie des Procédés Alimentaires AgroParistech, INRA; 78850; Thiverval Grignon; France
| | - J. Schenk
- Process Science Group, Corporate R&D Division, Firmenich S.A.; La Jonction, Route des Jeunes 1; 1211; Geneva 8; Switzerland
| | - U. Jenelten
- Process Science Group, Corporate R&D Division, Firmenich S.A.; La Jonction, Route des Jeunes 1; 1211; Geneva 8; Switzerland
| | - I. Souchon
- UMR 782 Laboratoire de Génie et Microbiologie des Procédés Alimentaires AgroParistech, INRA; 78850; Thiverval Grignon; France
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Miesbach W, Schenk J, Alesci S, Lindhoff-Last E. Comparison of the fibrinogen Clauss assay and the fibrinogen PT derived method in patients with dysfibrinogenemia. Thromb Res 2010; 126:e428-33. [DOI: 10.1016/j.thromres.2010.09.004] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2010] [Revised: 08/30/2010] [Accepted: 09/02/2010] [Indexed: 11/26/2022]
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22
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Mergenthaler U, Heymanns J, Köppler H, Thomalla J, van Roye C, Schenk J, Weide R. Evaluation of psychosocial distress in patients treated in a community-based oncology group practice in Germany. Ann Oncol 2010; 22:931-938. [PMID: 20926545 PMCID: PMC3065878 DOI: 10.1093/annonc/mdq455] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background: Systematic evaluation of psychosocial distress in oncology outpatients is an important issue. We assessed feasibility and benefit of standardized routine screening using the Distress Thermometer (DT) and Problem List (PL) in all patients of our community-based hematooncology group practice. Patients and methods: One thousand four hundred forty-six patients were screened between July 2008 and September 2008. Five hundred randomly selected patients were sent a feedback form. Results: The average distress level was 4.7, with 37% indicating a distress level >5. Patients with nonmalignant diseases (81% autoimmune diseases or hereditary hemochromatosis) showed the highest distress level of 5.2. Most distressed were patients who just learned about relapse or metastases (6.4), patients receiving best supportive care (5.4) and patients receiving adjuvant antihormonal therapy (5.4). Ninety-seven percent of patients appreciated to speak to their doctor about their distress. Fifty-six percent felt better than usual after this consultation. Conclusion: DT and PL are feasible instruments to measure distress in hematooncology outpatients receiving routine care. DT and PL are able to improve doctor–patient communication and thus should be implemented in routine patient care. The study shows that distress is distributed differently between individuals, disease groups and treatment phases.
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Affiliation(s)
| | | | | | | | | | - J Schenk
- Radiology Group Practice, Mammography Screening Unit Mittelrhein, Koblenz, Germany
| | - R Weide
- Hematology/Oncology Group Practice.
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Alahmad A, Preuss KD, Schenk J, Füreder W, Schrezenmeier H, Müller-Lantzsch N, Schubert J, Pfreundschuh M. Desmoplakin and KIF20B as target antigens in patients with paroxysmal nocturnal haemoglobinuria. Br J Haematol 2010; 151:273-80. [DOI: 10.1111/j.1365-2141.2010.08345.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Kerl R, Kaßing M, Schenk J, Jenelten U, Strube J. Standardisierte Vorgehensweise zur Verfahrensauslegung und -optimierung von Phytoextraktionsprozessen. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050622] [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: 11/09/2022]
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25
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Karl J, Borgya A, Gallusser A, Huber E, Krueger K, Rollinger W, Schenk J. Development of a novel, N-Terminal-proBNP (NT-proBNP) assay with a low detection limit. Scandinavian Journal of Clinical and Laboratory Investigation 2010. [DOI: 10.1080/00365519909168341] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Mergenthaler U, Heymanns J, Köppler H, Thomalla J, van Roye C, Schenk J, Weide R. 3009 Evaluation of psycho-social distress in patients treated in a community based oncology group practice in Germany. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)70608-1] [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: 10/20/2022] Open
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Kaßing M, Strube J, Jenelten U, Schenk J. Status der Fest-Flüssig-Extraktion von Pflanzenmaterial - Stand der Technik und Modellierung. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Sturn J, Voglsam S, Weiss B, Schenk J, Winter F. Evaluation of the Limiting Regime in Iron Ore Fines Reduction with H2-Rich Gases in Fluidized Beds: Fe2O3to Fe3O4. Chem Eng Technol 2009. [DOI: 10.1002/ceat.200800579] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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30
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Sturn J, Voglsam S, Weiss B, Winter F, Schenk J. Alternative Feineisenerzreduktion mit H 2-reichen Gasen unter Wirbel- schichtbedingungen. CHEM-ING-TECH 2008. [DOI: 10.1002/cite.200750463] [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: 11/12/2022]
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31
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Xu J, Guo Z, Su L, Nedambale TL, Zhang J, Schenk J, Moreno JF, Dinnyés A, Ji W, Tian XC, Yang X, Du F. Developmental potential of vitrified holstein cattle embryos fertilized in vitro with sex-sorted sperm. J Dairy Sci 2006; 89:2510-8. [PMID: 16772569 DOI: 10.3168/jds.s0022-0302(06)72326-8] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In vitro fertilization (IVF) is a feasible way to utilize sex-sorted sperm to produce offspring of a predetermined sex in the livestock industry. The objective of the present study was to examine the effects of various factors on bovine IVF and to systematically improve the efficiency of IVF production using sex-sorted sperm. Both bulls and sorting contributed to the variability among differential development rates of embryos fertilized by sexed sperm. Increased sorting pressures (275.8 to 344.75 kPa) did not have a significant effect on the in vitro fertility of the sorted sperm; neither did an extended period of 9 to 14 h from semen collection to sorting. As few as 600 sorted sperm were used to fertilize an oocyte, resulting in blastocyst development of 33.2%. Postwarming of vitrified sexed IVF embryos resulted in high morphological survival (96.3%) and hatching (84.4%) rates, similar to those fertilized by nonsexed sperm (93.1 and 80.6%, respectively). A 40.9% pregnancy rate was established following the transfer of 3,627 vitrified, sexed embryos into synchronized recipients. This was not different from the rates with nonsexed IVF (41.9%, n = 481), or in vivo-produced (53.1%, n = 192) embryos. Of 458 calves born, 442 (96.5%) were female and 99.6% appeared normal. These technologies (sperm sexing-IVF-vitrification-embryo transfer) provide farmers, as well as the livestock industry, with a valuable option for herd expansion and heifer replacement programs. In summary, calves were produced using embryos fertilized by sex-sorted sperm in vitro and cryopreserved by rapid cooling vitrification.
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Affiliation(s)
- J Xu
- Evergen Biotechnologies, Inc., Storrs, CT 06269, USA
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Boger-Megiddo I, Langeberg W, Schenk J, Li C. Neoplasms During Pregnancy and Risk of Adverse Birth Outcomes. Am J Epidemiol 2006. [DOI: 10.1093/aje/163.suppl_11.s50-b] [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: 11/13/2022] Open
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Schenk J, Crichton E. 351 INSEMINATION OF HOLSTEIN HEIFERS WITH SEXED SPERM PROCESSED WITH OR WITHOUT EGG YOLK IN THE GLYCEROL-CONTAINING FREEZING MEDIUM. Reprod Fertil Dev 2006. [DOI: 10.1071/rdv18n2ab351] [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: 11/23/2022] Open
Abstract
Preparation of media for use in processing sorted sperm is laborious and expensive. The objective was to determine whether pregnancy rates in heifers following AI of frozen/thawed X chromosome-bearing sperm were equivalent for sperm processed for cryopreservation using glycerol-containing medium with or without egg yolk. X chromosome-bearing sperm from each of two Holstein bulls were isolated on the basis of DNA content using a flow cytometer. Sorted sperm were collected in 50-mL plastic tubes containing 2-mL of 20% egg yolk-TRIS extender without glycerol until each tube contained 12.4 mL and approximately 12 million sperm. Sorted sperm were cooled (5�C) over 90 min before the addition of 12% glycerol-containing TIS medium with or without 20% egg yolk, as two equal volumes (6.5 mL) at 15-min intervals. Tubes containing 25 mL were centrifuged at 850g for 20 min (5�C). After the supernatant was removed, sperm pellets within treatments and bulls were pooled. Sperm concentration was adjusted to 10 � 106/mL with medium containing 6% glycerol and 20% egg yolk-TRIS. Sorted sperm were packaged and frozen in 0.25 mL-coded straws on freezing racks in LN2 vapor. Straws from each bull-treatment combination were equally packaged in goblets to assure random use. Post-thaw sperm progressive motility, determined with time-lapse photography ('track motility'), was 44% for non-egg yolk and 43% for 20% egg yolk-glycerol-containing media. Nonsynchronized Holstein heifers (n = 119) were inseminated 4, 12, or 24 h after observed standing estrus. Sperm were deposited into the uterine body anterior to the internal cervical os. Approximately 1 month after insemination, pregnancy was determined using ultrasound. Data were subjected to ANOVA. The pregnancy rate and 95% confidence interval for sorted sperm processed with non-egg yolk-glycerol-containing medium was 56% (49-73; n = 59), and 55% (38-62; n = 60) for the 20% egg yolk-glycerol-containing medium (P > 0.1). Bull or inseminator effects on pregnancy rates were not significant (P > 0.01). Pregnancy rates as a function of time of insemination at 4, 12, or 24 h relative to observed estrus were 62% n = 65; 48% n = 48; and 50% n = 6, respectively (P > 0.1). Even though the scope of the field trial was limited, omission of egg yolk from the glycerol-containing medium did not adversely affect pregnancy rates. Preparation of non-egg yolk-glycerol-containing medium greatly reduces associated time, labor, and expense. This study also resulted in quite acceptable pregnancy rates with insemination doses of 2 � 106 total sorted frozen/thawed sperm.
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Abstract
The recommended use of sexed sperm has been limited to heifers. The objective of this field trial was to determine pregnancy rates in lactating dairy cows following artificial insemination of 2 or 10 � 106 sexed or 10 � 106 unsexed frozen/thawed sperm. Sperm were separated into X chromosome-bearing populations at rates of 3000-5000/s, on the basis of DNA content, with a flow cytometer/sperm sorter operating at 40 psi and using 150 mW of laser intensity. Sperm were sorted, collected and cryopreserved in a Tris-based medium. Holstein cows, averaging 2.4 lactations (range: 1-9), were presynchronized with prostaglandin F2� (PGF)2�; (25 mg) i.m. at 40-58 days in milk (DIM) (average, 44 days). A second dose of PGF2� (25 mg) i.m. was administered 14 days later. All cows were screened with ultrasound 14 days later, and those with normal ovarian and uterine status were used for this study. Qualifying cows received 100 �g gonadotropin-releasing hormone (GnRH) i.m. (average, 72 DIM) and 25 mg PGF2� i.m. 7 days later, and then 100 �g GnRH i.m. 2 days after the prostaglandin. Cows (n = 172) were fixed-timed inseminated 16-19 h after the last GnRH treatment, balanced over three sperm insemination treatments, two Holstein bulls, and two inseminators. Both 32-day pregnancy and 60-day fetal sex were determined using ultrasound. Cows carrying fetuses identified as dying at the 32-day ultrasound check were considered not pregnant. Data were subjected to ANOVA. Effects of sperm treatment, bulls, inseminators, and subsequent interactions on pregnancy rate were not significant (P > 0.05). The 32-day pregnancy rate and 95% confidence interval for 10 � 106 unsexed, 10 � 106 sexed, and 2 � 106 sexed inseminates were 55.6 (42.5-68.6), 43.9 (31.6-57.0), and 40.4% (28.4-53.6), respectively. Additionally, DIM or cow parity did not affect pregnancy rate (P > 0.05). Fetal death (<32 days) for unsexed inseminates was 5.5% (two pregnancies) compared to 9.5% (four pregnancies) for pooled sexed inseminates (P > 0.05). There were four confirmed pregnancies of sexed sperm that also aborted between Days 32-60. Fetal sex ratio was significantly altered (P < 0.05) for sexed (93% female fetuses) compared to unsexed (52% female fetuses) inseminates. Pregnancy rate in these selected lactating cows inseminated with sexed sperm was not significantly lower (P > 0.05) than that for unsexed sperm. However, these results should be viewed cautiously due to the limited numbers of cows used. Successful use of sexed sperm in dairy cows, which approached an elective waiting period of 80 DIM, was achieved with cows that were selected for reproductive status prior to insemination.
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Meyer M, Franke K, Richter W, Steiniger F, Seyfert UT, Schenk J, Treuner J, Haberbosch W, Eisert R, Barthels M. New molecular defects in the gamma subdomain of fibrinogen D-domain in four cases of (hypo)dysfibrinogenemia: fibrinogen variants Hannover VI, Homburg VII, Stuttgart and Suhl. Thromb Haemost 2003; 89:637-46. [PMID: 12669117] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Four new molecular abnormalities in the gamma subdomain of the D domain elucidated in three unrelated thrombophilic patients and in one asymptomatic case of hypofibrinogenemia are reported: fibrinogen Suhl, gamma 326, Cys-->Tyr, fibrinogen Hannover VI, gamma 336 Met-->Ile, fibrinogen Stuttgart, gamma 345, Asn-->Asp and fibrinogen Homburg VII, gamma 354,Tyr-->Cys. In all cases, fibrin polymerization in plasma is impaired. In the case of fibrinogen Suhl, there was a normalization of fibrin polymerization in plasma at higher Ca(2+) concentration. The protective effect of Ca(2+) on plasmic degradation of fibrinogen was incomplete with all three variants. The fibrinogen molecules in variants Homburg VII and Suhl contain covalently bound albumin. Fibrin clot structure was abnormal in case of variant Homburg VII, with finer and more branched fibers forming a less porous clot. Experimental data indicate possible effects of the molecular abnormalities on Ca(2+)-binding, D-E interaction and lateral association of protofibrils.
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Affiliation(s)
- Michael Meyer
- Dept. Biomedical Engineering, University of Applied Sciences (FH), Carl-Zeiss-Promenade 2, D-0745 Jena, Germany.
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Abstract
The development of synthetic materials, textured polymers and metals and their increasing use in medicine make research of biomaterials' hemocompatibility very relevant. Problems arise from the polymorphism and diversity of the different materials, the static and dynamic test models and the patients' individual biologic factors. First, methods, models, tests as well as preanalytical factors have to be standardized according to the current knowledge in medicine laid down in the ISO 10993 part 4. The routine controls used in clinical chemistry and hematology have to be performed. Information about normal ranges (mean value, standard deviation, 95% confidence interval) should be provided. Tests have to be performed within a minimal delay of usually 2 h since some properties of blood change rapidly following collection. Various conditions (depending on the wall shear rate) were simulated within the centrifugation system and a Chandler system. Qualities and aspects of hemocompatibility such as platelet activation, oxidative burst, hemolysis, fibrinolysis, fibrin formation, generation of thrombin, contact activation, and complement activation were analysed and the results were entered non-dimensionally into a non-dimensional score system, where 0 points stand for the best and 65 points for the worst evaluation. We found a good correlation between the total score and contact activation, thrombin generation and leukocyte activation in a low shear stress system and a good correlation between the total score and thrombin generation, hemolysis and platelet activation in the high shear stress system. Further on the effect of additives and sterilization procedures can be measured. The concepts presented underline the relevance/importance of an efficient diagnostic approach to hemocompatibility that takes account of clinical and socio-economic concerns.
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Affiliation(s)
- Ulrich Theo Seyfert
- Abteilung Klinische Hämostaseologie und Transfusionsmedizin, Haus 75, Universitätskliniken, D-66421 Homburg, Germany.
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Schenk J. [Not Available]. Spieg Hist 2001; 17:576-83. [PMID: 11633290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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Abstract
In this article, we report on a family in which five examined members showed clinical signs of Fechtner syndrome, a condition which consists of hearing loss (49%), macro-thrombocytopenia (100%), leukocyte inclusion bodies (100%), eye anomalies (54.3%), and nephritis (38.7%). Hearing loss in Fechtner syndrome appears to be sensorineural with the higher frequencies primarily affected. One aim of the present report was to work out the clinical appearance of hearing loss compared to hearing loss in Alport's syndrome. The most striking difference between hearing loss in Fechtner syndrome and that in Alport's syndrome was that the vast majority of hearing disorders in the latter occur in male patients, which is not the case in Fechtner syndrome. Hearing loss in Fechtner syndrome develops from the second decade of life and progresses slowly with several episodes of sudden deafness.
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Affiliation(s)
- W Delb
- Universitätsklinik und Poliklinik für Hals-Nasen- Ohrenheilkunde, Homburg/Saar.
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Radziwon P, Schenk J, Boczkowska-Radziwon B, Wojtukiewicz MZ, Giedrojc J, Kloczko J, Breddin HK. The effects of polysulfonate derivative (GL 2021) on coagulation in vitro and thrombosis in vivo. Thromb Res 2000; 99:99-104. [PMID: 10904107 DOI: 10.1016/s0049-3848(00)00223-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- P Radziwon
- Department of Haematology, Medical Academy of Bialystok, Bialystok, Poland.
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Mörsdorf S, Pistorius G, Orthleb R, Pindur G, Schenk J. [Late onset of heparin-induced thrombocytopenia with recurrent arterial thromboses and amputation]. Dtsch Med Wochenschr 1999; 124:1271-4. [PMID: 10587714 DOI: 10.1055/s-2007-1024531] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
HISTORY An 80-year-old woman had been hospitalized in a psychiatric clinic where, on the 22nd day, she sustained a fracture of the neck of the left femur, which was treated by internal screw fixation. The postoperative course was at first without complication. But 9 days postoperatively her platelet count had fallen to 59,000/microliter. As heparin induced type II thrombocytopenia (HIT II) was suspected, the thrombosis prophylaxis with low-molecular heparin was replaced by sodium danaparoid (twice 750 units subcutaneously). Despite this, ischaemia of the right lower leg developed and required amputation. On the following day the left lower leg and foot also became ischemic, where upon she was admitted to the author's hospital (37 days after her admission to the psychiatric clinic). ADMISSION FINDINGS The patient was in a reduced general condition (body-mass index 19.5 kg/m2). She was disoriented as to place and time. Her blood pressure was 140/80 mmHg, her pulse irregular with a ventricular rate of 100/min. The skin below the middle of the left lower leg was cold and livid and the pedal pulses were not palpable. LABORATORY TESTS Haemoglobin content was 9.7 g/dl, the white cell count 9,200/microliter, and platelet count 54,000/microliter. Electrolytes and creatinine were within normal limits. TREATMENT AND COURSE Thrombendarterectomy was performed once via the left groin under danaparoid anticoagulation. There was no re-occlusion and the patient was able to walk again.--It was ascertained subsequently, she had already been given ordinary heparin in the psychiatric clinic for 20 days. Her platelet count of around 70,000/microliter returned to normal even though heparin administration was continued. CONCLUSION A reduction in platelet count by more than half during heparin treatment suggests heparin-induced thrombocytopenia, in which case heparin should be discontinued at once. In high-risk patients adequate treatment should be initiated with other anticoagulants even before the occurrence of thromboembolism.
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Affiliation(s)
- S Mörsdorf
- Abteilung für klinische Hämostaseologie und Transfusionsmedizin, Universitätskliniken des Saarlandes.
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Karl J, Borgya A, Gallusser A, Huber E, Krueger K, Rollinger W, Schenk J. Development of a novel, N-terminal-proBNP (NT-proBNP) assay with a low detection limit. Scand J Clin Lab Invest Suppl 1999; 230:177-81. [PMID: 10389216] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
A novel, highly sensitive and specific N-Terminal-proBNP (NT-proBNP) assay based on a sandwich format has been developed. The assay time is below 2 hours and no extraction process is needed. The calibration curve covers a NT-proBNP concentration range from 0 pmol/L up to 600 pmol/L. The analytical detection limit of the assay was estimated to be 2.7 pmol/L (3 SD). The intra-assay coefficient of variation is 5.7% (at 50 pmol/L) and 6.1% (at 250 pmol/L), while the inter-assay CVs are 15.8% (15 pmol/L) and 8.2% (250 pmol/L). There is no significant interference by bilirubin (up to 900 mumol/L), haemoglobin (up to 10 g/L), rheumatoid factors (up to 975 IU/mL), triglycerides (up to 20.5 mmol/L), biotin (up to 50 micrograms/L), digoxin (up to 100 micrograms/L) and digitoxin (up to 200 micrograms/L). The analyte NT-proBNP is fully stable in whole blood over 3 days and in EDTA-plasma over 24 hours. This good stability of NT-proBNP compared to other less stable natriuretic peptides is a significant advantage and a main prerequisite for a routine diagnostic marker. Preliminary results of using this new assay in clinical studies for diagnosing and monitoring left ventricular dysfunction demonstrate that there is a significant gain in diagnostic validity.
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Affiliation(s)
- J Karl
- Roche Diagnostics GmbH, Tutzing, Germany
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Karl J, Borgya A, Gallusser A, Huber E, Krueger K, Rollinger W, Schenk J. Development of a novel, N-Terminal-proBNP (NT-proBNP) assay with a low detection limit. Scand J of Clinical & Lab Investigation 1999. [DOI: 10.3109/00365519909168341] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Radziwon P, Boczkowska-Radziwon B, Giedrojc J, Schenk J, Wojtukiewicz MZ, Kloczko J, Breddin HK. Effects of polysulfonate derivative (GL 522-Y-1) on coagulation in vitro and thrombosis in vivo. Haemostasis 1998; 28:86-92. [PMID: 10087433 DOI: 10.1159/000022417] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We have investigated the influence of a polysulfonate derivative - GL 522-Y-1 - on platelet-induced thrombin generation time, platelet adhesion to siliconized glass, platelet aggregation induced by collagen and ADP, on aPTT, PT and TT in vitro and studied its antithrombotic effect in an animal model of thrombosis in vivo. In vitro, GL 522-Y-1 caused inhibition of ADP- and collagen-induced aggregation. In a dose-dependent manner this compound inhibited PITT, aPTT, and PT. GL 522-Y-1 did not prolong thrombin time. GL 522-Y-1 inhibited in vivo the laser-induced thrombus formation after intravenous and oral administration. On the basis of its unique antithrombotic properties, GL 522-Y-1 seems to open a new pathway in the field of antithrombotics.
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Affiliation(s)
- P Radziwon
- Department of Hematology, University Medical School, Bialystok, Poland
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Glusa E, Barthel W, Schenk J, Radziwon P, Butti A, Markwardt F, Breddin KH. Effects of a supersulfated low molecular weight heparin (IK-SSH) on different hemostatic parameters. Haemostasis 1998; 28:45-56. [PMID: 9885370 DOI: 10.1159/000022383] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In a phase I trial effects of a new supersulfated low molecular weight heparin (IK-SSH) on different hemostatic parameters were investigated in healthy volunteers. Parameters studied were activated partial thromboplastin time (aPTT), thrombin time, Heptest, anti-activated factor II (anti-FIIa) and anti-activated factor X (anti-FXa) activity, platelet adhesion, platelet count, platelet-induced thrombin generation time (PITT), bleeding time, antithrombin III, fibrinogen and several safety parameters. After single intravenous (i.v.) injections of IK-SSH (0.14, 0.33 and 0.66 mg/kg) aPTT, Heptest and PITT were strongly and dose-dependently prolonged. After ascending subcutaneous (s.c.) doses of IK-SSH (0.33, 0.66 and 1 mg/kg) aPTT, Heptest and PITT were prolonged in a dose-dependent manner. Repeat s.c. injections of 1 mg/kg IK-SSH for 5 days markedly prolonged aPTT, Heptest and PITT. No cumulative effects were observed. Anti-FIIa and anti-FXa activity were not or only slightly increased. Bleeding time, thrombin time and platelet adhesion were not significantly changed after i.v. and s.c. injections of IK-SSH. However, tissue factor pathway inhibitor (TFPI) concentration was markedly increased after each injection of IK-SSH and returned to the preinjection value 24 h later. IK-SSH prolongs aPTT, Heptest and PITT in a similar manner as other low molecular weight heparins but without significantly affecting thrombin time, FIIa and FXa activity. The release of TFPI may well be responsible for the prolongation of aPTT, Heptest and PITT. IK-SSH may be further developed as an antithrombotic agent.
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Affiliation(s)
- E Glusa
- Center for Vascular Biology and Medicine, Medical Faculty, University of Jena, Germany
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Schenk J, Hebden RA, Dai S, McNeill JH. Integrated cardiovascular function in the conscious streptozotocin-diabetic deoxycorticosterone-acetate-hypertensive rats. Pharmacology 1994; 48:211-5. [PMID: 8177907 DOI: 10.1159/000139182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 01/29/2023]
Abstract
Blood pressure, heart rate, and left ventricular function were measured in conscious diabetic Sprague-Dawley rats subjected to 5 weeks of deoxycorticosterone acetate (DOCA) treatment which was started 1 week following intravenous injection of streptozotocin (STZ) (60 mg/kg) to induce diabetes mellitus. It was found that chronic administration of DOCA in nondiabetic animals caused an increase in blood pressure and functional parameters of left ventricle, and a decrease in heart rate and plasma insulin levels. Normotensive diabetic rats exhibited hyperglycemia, hypoinsulinemia, and a lower body weight as compared with control animals but did not show significant abnormalities in cardiovascular function. DOCA-hypertensive STZ-diabetic rats had similar hyperglycemia, milder hypoinsulinemia, and a significantly lower rate of left ventricular relaxation and systolic blood pressure compared with the nondiabetic DOCA-hypertensive animals. It is concluded that the addition of DOCA hypertension to intact 6-week STZ-diabetic Sprague-Dawley rats results in the occurrence of cardiac dysfunction.
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Affiliation(s)
- J Schenk
- Division of Pharmacology and Toxicology, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada
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Abstract
Deoxycorticosterone acetate (DOCA) is an agent commonly used to induce hypertension in experimental animals. This form of hypertension is dependent on altered regulation of central pressor mechanisms including the brain renin-angiotensin system. Additionally, there are characteristic changes involving the cardiovascular system and baroreflex responses. This review will discuss aspects of the pathogenesis of DOCA hypertension and the effect of various antihypertensive agents on the development of this form of hypertension.
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Affiliation(s)
- J Schenk
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada
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Abstract
A fluid-filled catheter consisting of 100 cm of PE50 polyethylene tubing welded to 7 cm of PE10 polyethylene tubing (PE50/PE10) was constructed for the purpose of measuring the rate of left ventricular pressure development (+dP/dt) in conscious, freely moving rats. Prior to in vivo experiments, four PE50/PE10 catheters were randomly selected, and their natural frequencies and damping ratios were determined using a square wave impact. The mean (n = 4), natural frequency of these catheters was shown to be 35.0 +/- 5.5 Hz, and the mean damping ratio was 0.83 +/- 0.10. Natural frequency plotted against increasing PE50 tubing length was shown to have a slope of -0.44 Hz/cm with a correlation coefficient of 0.99. The effect of the 7-cm PE10 tubing segment on the catheter damping ratio was also demonstrated. One of the four PE50/PE10 type catheters exhibited a damping ratio of 0.74 +/- 0.09. When the 7-cm PE10 tube was removed, the damping ratio was reduced to 0.31 +/- 0.04. Left ventricular +dP/dt obtained in conscious rats with a PE50/PE10 catheter (n = 7; 6300 +/- 300 mmHg/sec) was significantly less than the +dP/dt obtained using a 100-cm PE50 catheter (n = 6; 9400 +/- 400 mmHg/sec). The results of this study make it clear that the PE50/PE10 catheter is suitable for the measurement of left ventricular +dP/dt in the conscious rat, and that catheter design has a profound influence on both the catheter natural frequency and damping ratio.
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Affiliation(s)
- J Schenk
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada
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van Straten RJ, Hitge ML, Kalk W, Schenk J. A study of acrylic resin denture base material distortion using computer-aided holographic interferometry. INT J PROSTHODONT 1991; 4:577-85. [PMID: 1817530] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A holographic interferometer for investigating deformations of dental prostheses is described. Residual stress relaxation resulting from the polymerization of acrylic resin dentures is qualitatively studied during the first 48 hours following fabrication. The resulting fringe patterns show a symmetry that is correlated to the shape of the denture. A quantitative analysis of the interferograms was performed with the aid of a computer program. The computer-aided holographic interferometer was tested using disk-shaped acrylic resin materials. Dimensional deformations resulting from temperature changes were measured with an accuracy better than 0.2 microns. Because of the aging of the resin material, the reaction to temperature changes may differ as a function of time and may be studied using quantitative comparison of deformation plots. For convenience, the original object shape can be added to or subtracted from the graphical deformation data.
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Schwarz JA, Gladigau V, Görlich HD, Klingmann I, Kori-Lindner C, Langen ML, Mangold B, Neis W, Schenk J, Uehleke B. [Future requirements for the composition and working methods of ethics commissions for the viewpoint of the Association of Physicians in the Pharmaceutical Industry e. V.(FAPI)]. Arzneimittelforschung 1990; 40:1056-60. [PMID: 2080944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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50
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