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deLaforcade A, Bacek L, Blais M, Boyd C, Brainard BM, Chan DL, Cortellini S, Goggs R, Hoareau GL, Koenigshof A, Li R, Lynch A, Ralph A, Rozanski E, Sharp CR. 2022 Update of the Consensus on the Rational Use of Antithrombotics and Thrombolytics in Veterinary Critical Care (CURATIVE) Domain 1- Defining populations at risk. J Vet Emerg Crit Care (San Antonio) 2022; 32:289-314. [PMID: 35499966 PMCID: PMC9322658 DOI: 10.1111/vec.13204] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 03/31/2022] [Accepted: 03/31/2022] [Indexed: 12/23/2022]
Abstract
OBJECTIVES To expand the number of conditions and interventions explored for their associations with thrombosis in the veterinary literature and to provide the basis for prescribing recommendations. DESIGN A population exposure comparison outcome format was used to represent patient, exposure, comparison, and outcome. Population Exposure Comparison Outcome questions were distributed to worksheet authors who performed comprehensive searches, summarized the evidence, and created guideline recommendations that were reviewed by domain chairs. The revised guidelines then underwent the Delphi survey process to reach consensus on the final guidelines. Diseases evaluated in this iteration included heartworm disease (dogs and cats), immune-mediated hemolytic anemia (cats), protein-losing nephropathy (cats), protein-losing enteropathy (dogs and cats), sepsis (cats), hyperadrenocorticism (cats), liver disease (dogs), congenital portosystemic shunts (dogs and cats) and the following interventions: IV catheters (dogs and cats), arterial catheters (dogs and cats), vascular access ports (dogs and cats), extracorporeal circuits (dogs and cats) and transvenous pacemakers (dogs and cats). RESULTS Of the diseases evaluated in this iteration, a high risk for thrombosis was defined as heartworm disease or protein-losing enteropathy. Low risk for thrombosis was defined as dogs with liver disease, cats with immune-mediated hemolytic anemia, protein-losing nephropathy, sepsis, or hyperadrenocorticism. CONCLUSIONS Associations with thrombosis are outlined for various conditions and interventions and provide the basis for management recommendations. Numerous knowledge gaps were identified that represent opportunities for future studies.
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Affiliation(s)
- Armelle deLaforcade
- Department of Clinical Sciences, Cummings School of Veterinary MedicineTufts UniversityNorth GraftonMassachusettsUSA
| | - Lenore Bacek
- Bluepearl Specialty and Emergency Pet HospitalTampaFloridaUSA
| | - Marie‐Claude Blais
- Department of Clinical SciencesUniversity of MontrealSaint‐HyacintheQCCanada
| | - Corrin Boyd
- School of Veterinary MedicineMurdoch UniversityMurdochAustralia
| | - Benjamin M Brainard
- Department of Small Animal Medicine and Surgery, Clinical SciencesUniversity of GeorgiaAthensGeorgiaUSA
| | - Daniel L. Chan
- Department of Clinical Science and ServicesThe Royal Veterinary CollegeLondonUK
| | - Stefano Cortellini
- Department of Clinical Science and ServicesThe Royal Veterinary CollegeLondonUK
| | - Robert Goggs
- Department of Clinical SciencesCornell University College of Veterinary MedicineIthacaNew YorkUSA
| | | | - Amy Koenigshof
- Department of Emergency CareTwo by Two Animal HospitalBerrien SpringsMichiganUSA
| | - Ron Li
- Department of Veterinary Surgical and Radiological SciencesSchool of Veterinary MedicineUniversity of California DavisDavisCaliforniaUSA
| | - Alex Lynch
- Department of Clinical SciencesNC State College of Veterinary MedicineRaleighNorth CarolinaUSA
| | | | - Elizabeth Rozanski
- Department of Clinical Sciences, Cummings School of Veterinary MedicineTufts UniversityNorth GraftonMassachusettsUSA
| | - Claire R Sharp
- School of Veterinary MedicineMurdoch UniversityMurdochAustralia
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2
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Queiroz DP, Pinto IM, Besteiro MCF, Silva AFM, Gil MH, Guiomar AJ, de Pinho MN. Surface and Hemocompatibility Studies of Bi-Soft Segment Polyurethane Membranes. Int J Artif Organs 2018; 29:866-72. [PMID: 17033994 DOI: 10.1177/039139880602900908] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Cross-linked urethane/urea membranes with two soft segments were prepared by extending a poly(propylene oxide) based tri-isocyanate-terminated prepolymer (PUR) with polybutadiene diol (PBDO). The ratio of prepolymer and polybutadiene diol was varied to yield cross-linked membranes with different compositions, exhibiting different degrees of phase-separation of the PBDO segments in the bulk and of surface enrichment in PUR. In this work, surface energy and hemocompatibility aspects (hemolysis and thrombosis) of the PUR/PBDO membranes were evaluated. The results showed that the membrane surface energy increased with the PBDO content until 25% of PBDO, and decreased thereafter. The introduction of the second, more hydrophobic, soft segment (PBDO) in the PUR membranes turned hemolytic into non-hemolytic membranes and, for a blood-material contact time of 10 minutes, decreased the thrombogenicity significantly. The 10% PBDO membrane was the least thrombogenic and was also non-hemolytic. The hemolysis degree did not vary significantly with the PBDO content while, for blood-material contact times of 10 minutes, the thrombogenicity increased with an increase in PBDO content above 10%. Membrane thrombogenicity varied with the blood-material contact time. For blood contact times of 10 minutes, all membranes tested were less thrombogenic than glass.
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Affiliation(s)
- D P Queiroz
- Department of Chemical Engineering, Higher Institute of Technology, Lisbon - Portugal
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3
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Nouman M, Jubeli E, Saunier J, Yagoubi N. Exudation of additives to the surface of medical devices: impact on biocompatibility in the case of polyurethane used in implantable catheters. J Biomed Mater Res A 2016; 104:2954-2967. [DOI: 10.1002/jbm.a.35837] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/21/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Micheal Nouman
- Université Paris-Sud, EA401 Matériaux et Santé, IFR 141, Faculté De Pharmacie; Châtenay Malabry France
| | - Emile Jubeli
- Université Paris-Sud, EA401 Matériaux et Santé, IFR 141, Faculté De Pharmacie; Châtenay Malabry France
| | - Johanna Saunier
- Université Paris-Sud, EA401 Matériaux et Santé, IFR 141, Faculté De Pharmacie; Châtenay Malabry France
| | - Najet Yagoubi
- Université Paris-Sud, EA401 Matériaux et Santé, IFR 141, Faculté De Pharmacie; Châtenay Malabry France
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Akhavan B, Jarvis K, Majewski P. Development of oxidized sulfur polymer films through a combination of plasma polymerization and oxidative plasma treatment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1444-1454. [PMID: 24428447 DOI: 10.1021/la4045489] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A novel two-step process consisting of plasma polymerization and oxidative plasma treatment is introduced in this article for the first time for the fabrication of -SO(x)(H)-functionalized surfaces. Plasma-polymerized thiophene (PPT) was initially deposited onto silicon wafers and subsequently SO(x)(H)-functionalized using air or oxygen plasma. The effectiveness of both air and oxygen plasma treatments in introducing sulfur-oxygen groups into the PPT film was investigated as the plasma input specific energy and treatment time were varied. The surface chemistries of untreated and treated PPT coatings were analyzed by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectroscopy (ToF-SIMS), whereas spectroscopic ellipsometry was used to evaluate the film thickness and ablation rate. Surface chemistry analyses revealed that high concentrations of -SO(x)(H) functionalities were generated on the surface upon either air or oxygen plasma treatment. It was found that, at low plasma input energies, the oxidation process was dominant whereas, at higher energies, ablation of the film became more pronounced. The combination of thiophene plasma polymerization and air/oxygen plasma treatment was found to be a successful approach to the fabrication of -SO(x)(H)-functionalized surfaces.
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Affiliation(s)
- Behnam Akhavan
- School of Engineering, Mawson Institute, University of South Australia , Mawson Lakes, South Australia 5095, Australia
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5
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Wang J, Wan Y, Huang Y. Immobilisation of heparin on bacterial cellulose-chitosan nano-fibres surfaces via the cross-linking technique. IET Nanobiotechnol 2012; 6:52-7. [PMID: 22559707 DOI: 10.1049/iet-nbt.2011.0038] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In recent years, bacterial cellulose (BC) has been fabricated in tubular shape as scaffold for vascular tissue engineering. However, in order to improve the blood compatibility and regenerative ability of BC, BC nano-fibres should be cross-linked with some materials which can prevent the formation of blood clot. In this work, a novel BC-chitosan (CS)/heparin (Hep) composite was prepared. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier-transformed infrared spectroscopy (FTIR) were used to analyse the obtained samples. It is observed by SEM and TEM that the obtained composites remain the three-dimensional (3D) network and porous structure. The results of XRD reveal that the curve of BC-CS/Hep composite assumes the characteristic absorption peaks of BC, CS and Hep. The FTIR results also confirm the presence of CS and Hep on the surface of BC nano-fibres. In conclusion, BC-CS/Hep composites were obtained by the co-synthesis technique and the cross-linking method, respectively. Furthermore, the MC3T3-E1 cells were seeded on the obtained samples to test the cell compatibility. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide results indicated that the BC-CS/Hep composites were suitable for cell proliferation and ingrowth.
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Affiliation(s)
- J Wang
- Tianjin University, School of Materials Science and Engineering, Tianjin, People's Republic of China.
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6
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Kostadinova A, Seifert B, Albrecht W, Malsch G, Groth T, Lendlein A, Altankov G. Novel Polymer Blends for the Preparation of Membranes for Biohybrid Liver Systems. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 20:821-39. [DOI: 10.1163/156856209x427005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Aneliya Kostadinova
- a Institute of Biophysics, Bulgarian Academy of Science, Akad. G. Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria
| | - Barbara Seifert
- b GKSS Research Center, Institute of Polymer Research, Kantstrasse 55, 14513 Teltow, Germany
| | - Wolfgang Albrecht
- c GKSS Research Center, Institute of Polymer Research, Kantstrasse 55, 14513 Teltow, Germany
| | - Guenter Malsch
- d GKSS Research Center, Institute of Polymer Research, Kantstrasse 55, 14513 Teltow, Germany
| | - Thomas Groth
- e Biomedical Materials Group, Dept. Pharmaceutics and Biopharmaceutics, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Strasse 1, 06120 Halle (Saale), Germany
| | - Andreas Lendlein
- f GKSS Research Center, Institute of Polymer Research, Kantstrasse 55, 14513 Teltow, Germany
| | - George Altankov
- g ICREA and Institute for Bioengineering of Catalonia, Parc Scientific de Barcelona, Josep Samitier 1/5, 08028 Barcelona, Spain
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Alibeik S, Sheardown H, Rizkalla AS, Mequanint K. Protein adsorption and platelet adhesion onto ion-containing polyurethanes. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 18:1195-210. [DOI: 10.1163/156856207781554055] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Sara Alibeik
- a Biomedical Engineering Graduate Program, University of Western Ontario, London, ON, Canada N6A 5B9
| | - Heather Sheardown
- b Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, ON, Canada L8S 4L7; Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Amin S. Rizkalla
- c Biomedical Engineering Graduate Program, University of Western Ontario, London, ON, Canada N6A 5B9; Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, Canada N6A 5B9; Division of Biomaterials Science, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada N6A 5C1
| | - Kibret Mequanint
- d Biomedical Engineering Graduate Program, University of Western Ontario, London, ON, Canada N6A 5B9; Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, Canada N6A 5B9
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8
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Qin X, Zhao F, Liu Y, Feng S. Frontal photopolymerization synthesis of multilayer hydrogels with high mechanical strength. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2011.07.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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9
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Qin X, Zhao F, Feng S. Chemical modification and synthesizing conditions of nanocomposite hydrogels with high mechanical strength crosslinked by hydrophilic reactive microgels. J Appl Polym Sci 2011. [DOI: 10.1002/app.34389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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10
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Faria M, Brogueira P, de Pinho MN. Sub-micron tailoring of bi-soft segment asymmetric polyurethane membrane surfaces with enhanced hemocompatibility properties. Colloids Surf B Biointerfaces 2011; 86:21-7. [PMID: 21497070 DOI: 10.1016/j.colsurfb.2011.03.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Revised: 03/03/2011] [Accepted: 03/11/2011] [Indexed: 12/01/2022]
Abstract
Enhancement of membrane hemocompatibility is achieved through the control of the surface morphology. Bi-soft segment integrally skinned poly(ester urethane urea) (PEUU) membranes containing polycaprolactone (PCL) as a second soft segment are synthesized with PCL-diol ranging from 0% to 15% (w/w). Scanning electron microscopy and atomic force microscopy characterized membrane asymmetry and sub-micron roughnesses, R(a), of top dense surfaces as major assets to the development of platelet/membrane surface interactions. Here we show that the top dense surfaces of asymmetric PEUU membranes can be tailored with different morphologies when the ratio of the two soft segments PPO/PCL varies. A strong correlation between the top surface roughnesses, R(a) and platelet deposition is identified. The membrane with 15% (w/w) of PCL-diol, PEUU 85, shows the smoothest top dense layer with a R(a) as low as 1 nm which is 5 times below the characteristic value of the PEUU membrane with a single soft segment. The PEUU 85 asymmetric membrane displayed minimal platelet deposition and inhibition of extreme stages of platelet activation.
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Affiliation(s)
- Mónica Faria
- ICEMS and Department of Chemical and Biological Engineering, Instituto Superior Tecnico, Technical University of Lisbon, 1049-001 Lisboa, Portugal
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11
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Ding YX, Streitmatter S, Wright BE, Hlady V. Spatial variation of the charge and sulfur oxidation state in a surface gradient affects plasma protein adsorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:12140-6. [PMID: 20568822 PMCID: PMC2929825 DOI: 10.1021/la101674b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
A gradient of negative surface charge based on the 1D spatial variation from surface sulfhydryl to mixed sulfhydryl-sulfonate moieties was prepared by the controlled UV oxidation of a 3-mercaptopropylsilane monolayer on fused silica. The adsorption of three human plasma proteins--albumin (HSA), immunoglobulin G (IgG), and fibrinogen (Fgn)--onto such a surface gradient was studied using spatially resolved total internal reflection fluorescence (TIRF) and autoradiography. Adsorption was measured from dilute solutions equivalent to 1/100 (TIRF, autoradiography), 1/500, and 1/1000 (autoradiography) of protein physiological concentrations in plasma. All three proteins adsorbed more to the nonoxidized sulfhydryl region than to the oxidized, mixed sulfhydryl-sulfonate region of the gradient. In the case of HSA, the adsorption contrast along the gradient was largest when the adsorption took place from more dilute protein solutions. Increasing the concentration to 1/100 of the protein plasma concentration eliminated the effect of the gradient on HSA adsorption and, to the lesser extent, on IgG adsorption. In the case of Fgn, the greatest adsorption contrast was observed at the highest concentration used. On the basis of adsorption kinetics, the estimated binding affinity of HSA for the sulfhydryl region was twice the affinity for the mixed sulfhydryl-sulfonate region of the gradient. For IgG and Fgn, the initial adsorption was transport-limited and the initial adsorption rates approached the computed flux of the protein to the surface.
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Affiliation(s)
- Yong-Xue Ding
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112
| | - Seth Streitmatter
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112
| | - Bryon E. Wright
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112
| | - Vladimir Hlady
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112
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12
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Vasilev K, Sah VR, Goreham RV, Ndi C, Short RD, Griesser HJ. Antibacterial surfaces by adsorptive binding of polyvinyl-sulphonate-stabilized silver nanoparticles. NANOTECHNOLOGY 2010; 21:215102. [PMID: 20431209 DOI: 10.1088/0957-4484/21/21/215102] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This paper presents a novel and facile method for the generation of efficient antibacterial coatings which can be applied to practically any type of substrate. Silver nanoparticles were stabilized with an adsorbed surface layer of polyvinyl sulphonate (PVS). This steric layer provided excellent colloidal stability, preventing aggregation over periods of months. PVS-coated silver nanoparticles were bound onto amine-containing surfaces, here produced by deposition of an allylamine plasma polymer thin film onto various substrates. SEM imaging showed no aggregation upon surface binding of the nanoparticles; they were well dispersed on amine surfaces. Such nanoparticle-coated surfaces were found to be effective in preventing attachment of Staphylococcus epidermidis bacteria and also in preventing biofilm formation. Combined with the ability of plasma polymerization to apply the thin polymeric binding layer onto a wide range of materials, this method appears promising for the fabrication of a wide range of infection-resistant biomedical devices.
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Affiliation(s)
- Krasimir Vasilev
- Mawson Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia.
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13
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Real-time measurements of coagulation on bacterial cellulose and conventional vascular graft materials. Acta Biomater 2010; 6:1125-30. [PMID: 19800035 DOI: 10.1016/j.actbio.2009.09.019] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 08/19/2009] [Accepted: 09/24/2009] [Indexed: 11/20/2022]
Abstract
The search for a functional, small diameter (<5mm) vascular graft has been ongoing for over 30 years, but yet there is no consistently reliable synthetic graft. The primary mechanisms of graft failure are intimal hyperplasia, poor blood flow and surface thrombogenicity. Bacterial cellulose (BC) became therefore a proposed new biosynthetic vascular graft material. Since conventional methods are not suited for coagulation measurements on BC, we have adapted the automated calibrated thrombin generation method for measurements of biomaterial-induced coagulation of BC as compared with clinically used graft materials i.e., expanded poly(tetrafluoroethylene) (ePTFE) and poly(ethyleneterephtalat) (PET). We have also visualized the coagulation propagation at the material surfaces. Thrombin generation experiments revealed dramatic differences between the materials tested. Both ePTFE and BC were found to generate longer lag times and ttpeak values than PET. Most importantly, BC was found to generate the lowest "peak", indicating a slower coagulation process at the surface. These results are also supported by the measurements of factor XIIa generation and analysis of surface coagulation times, which were detected in the following increasing order (mean + or - SD): PET (27 + or - 8 min)<BC (46 + or - 9 min)<ePTFE (61 + or - 21 min). Real-time measurement of coagulation seems to have the potential for becoming a powerful tool for evaluation of biomaterials for blood-contacting devices.
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Yamanaka H, Rosenberg G, Weiss WJ, Snyder AJ, Zapanta CM, Siedlecki CA. Multiscale analysis of surface thrombosis in vivo in a left ventricular assist system. ASAIO J 2006; 51:567-77. [PMID: 16322720 DOI: 10.1097/01.mat.0000181707.06225.a0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Thrombosis limits the success of ventricular assist devices as the demand for alternatives to heart transplants is increasing. This study mapped the occurrence of thrombosis in a left ventricular assist system (LVAS) to better understand the biologic response to these devices. Nine calves divided into two groups were implanted with LVAS for 28 to 30 days. One group was anticoagulated, whereas the second group received no long-term anticoagulation. The blood-contacting poly(urethane urea) surfaces of blood sacs in the LVAS were examined for macroscopic thrombi upon retrieval. The sac was partitioned into eight sections and imaged for thrombi by scanning electron microscopy. No difference in thrombosis was observed macroscopically between the groups. Anticoagulation appeared to result in reduction of platelet-like structures, but the presence of fibrin-like structures remained similar between groups. Regional differences correlating with high and low shear stress regions were observed. At the macroscale, fewer thrombi were recorded in the high shear stress ports. At the microscale, features resembling fibrin were observed primarily in the ports and platelet-like features were common in lower shear stress regions. These variations in thrombosis with anticoagulation and location are likely due to varied fluid dynamics within the LVAS blood sac.
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Affiliation(s)
- Hanako Yamanaka
- Department of Bioengineering, The Pennsylvania State University, Hershey, PA 17033, USA
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16
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Rathna GVN. Hydrogels of modified ethylenediaminetetraacetic dianhydride gelatin conjugated with poly(ethylene glycol) dialdehyde as a drug-release matrix. J Appl Polym Sci 2003. [DOI: 10.1002/app.13205] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Moser D, Rasse M, Schopper C, Lagogiannis G, Frass M, Ewers R, Kaye AD, Hofbauer R. A scanning electron microscopic study on thrombogenicity of intraarterial catheters for chemotherapeutic treatment in head and neck cancer. Head Neck 2002; 24:566-74. [PMID: 12112554 DOI: 10.1002/hed.10099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND The purpose of this study was to assess the impact of standard anticoagulation and intermittent catheter irrigation on clot formation on intraarterial chemotherapeutical catheters. METHODS Sixteen nonheparinized catheters were placed in the carotid vessels of 10 patients. Ten catheters were perfused with chemotherapeutic drugs; six catheters were not perfused. Patients received LMWH anticoagulation; catheters were irrigated with boluses of heparinized saline daily. Catheters were retrieved for SEM evaluation after a mean intravessel placement interval of 21 days. RESULTS All samples demonstrated accumulation of thrombotic debris on luminal sides and outsides of catheters. Obliteration was seen in three samples. Detachment of thrombus fragments was present in several specimens. No significant dependence of clot formation on placement interval and chemotherapeutic perfusion was calculated. CONCLUSIONS Standard anticoagulation was ineffective in clot prevention. Heparinized catheters might potentially reduce the risk of clot formation. A delivery system should be engaged for continuous irrigation of catheters with heparinized saline.
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Affiliation(s)
- Doris Moser
- University Hospital of Cranio-Maxillofacial and Oral Surgery, Medical School, University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria.
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Higuchi A, Tamiya S, Tsubomura T, Katoh A, Cho CS, Akaike T, Hara M. Growth of L929 cells on polymeric films prepared by Langmuir-Blodgett and casting methods. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2000; 11:149-68. [PMID: 10718476 DOI: 10.1163/156856200743625] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The growth and spreading of fibroblast, L929 cells, on various polymeric films prepared by the Langmuir-Blodgett (LB) and casting methods were investigated. L929 cells, which were cultivated on collagen and synthetic polymeric films prepared by the LB method, adhered and spread much more than those on synthetic films prepared by the casting method. This is explained by the fact that cell growth and cell spreading are suitable for L929 cells on the films having serum proteins that contain a high alpha-helix content, because LB films adsorbed those serum proteins estimated from the circular dichroism measurements of the films immersed in cell culture medium. An exponential relationship was observed from the plot of the cell density vs root mean square of roughness of the films, which is estimated by atomic force microscopy, whereas a linear relationship was observed from the plot of the spreading ratio vs the root mean square of roughness. It is suggested that the correlation between the cell growth or spreading ratio and surface roughness of the films where L929 cells were cultivated is considered to be more important than the correlation between the cell growth or spreading ratio and the contact angle of the films.
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Affiliation(s)
- A Higuchi
- Department of Industrial Chemistry, Seikei University, Musashino, Tokyo, Japan
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Labow RS, Meek E, Santerre JP. Synthesis of cholesterol esterase by monocyte-derived macrophages: a potential role in the biodegradation of poly(urethane)s. J Biomater Appl 1999; 13:187-205. [PMID: 9934625 DOI: 10.1177/088532829901300302] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Many studies have described the role of monocyte-derived macrophages (MDM) in inflammation leading to atherosclerosis, a process in which alterations in the metabolism of cholesterol esters is well established. On the other hand, the mechanism of MDM activation in response to biomaterial surfaces is still not well understood. Several studies have described the different degrees of activation of monocytes on poly(urethane) surfaces by measuring the release of early markers of differentiation, such as cytokines. It has been possible to decrease MDM activation in contact with materials by modifying the material surface with antioxidants. Therefore, it has been proposed that it is the reactive oxygen species provided by MDM which are responsible for deleterious effects observed in material-derived inflammation. A recent study has shown that one of the markers of the degree of differentiation of MDM is the synthesis of cholesterol esterase (CE), an enzyme demonstrated as causing biodegradation of polyester(urethane)s and more recently polyether- and polycarbonate-poly(urethane)s as well. In this review article, markers used to assess MDM differentiation on material surfaces will be described and related to the activation of MDM. In particular, the CE accumulation in MDM which is associated with atherosclerosis will be related to its degradative potential during chronic inflammation. How this may impact on the biostability of implanted poly(urethane) medical devices is discussed.
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Affiliation(s)
- R S Labow
- University of Ottawa Heart Institute, ON, Canada
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Disley DM, Blyth J, Cullen DC, You HX, Eapen S, Lowe CR. Covalent coupling of immunoglobulin G to a poly(vinyl)alcohol-poly(acrylic acid) graft polymer as a method for fabricating the interfacial-recognition layer of a surface plasmon resonance immunosensor. Biosens Bioelectron 1998; 13:383-96. [PMID: 9642773 DOI: 10.1016/s0956-5663(97)00114-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The synthesis of a terminally thiolated poly(vinyl)alcohol (PVA) grafted with Poly (acrylic acid) (PAA) side chains is described. The PVA-PAA graft polymer (PVAg) was end-tethered to silver surfaces via the terminal thiol functionality and the resultant mobile, hydrophilic polymer matrix exploited for the covalent immobilization of large quantities of polyclonal goat (anti-hIgG) antibody (IgG) with low levels of non-specific adsorption. An SPR immunosensor, fabricated with an IgG-PVA-silver interfacial layer proved capable of performing a sensitive label-free assay of human IgG antigen (hIgG) with minimal non-specific binding interference. A detection limit (DL) for hIgG from serum of 0.8 microgram/ml (5 nM) and an assay sensitivity of 0.66 ng hIgG/mm2/nM are reported.
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Affiliation(s)
- D M Disley
- Institute of Biotechnology, University of Cambridge, UK
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