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Venous catheters biofilm

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https://www.readbyqxmd.com/read/28704490/the-synthetic-killer-peptide-kp-impairs-candida-albicans-biofilm-in-vitro
#1
Simona Paulone, Andrea Ardizzoni, Arianna Tavanti, Serena Piccinelli, Cosmeri Rizzato, Antonella Lupetti, Bruna Colombari, Eva Pericolini, Luciano Polonelli, Walter Magliani, Stefania Conti, Brunella Posteraro, Claudio Cermelli, Elisabetta Blasi, Samuele Peppoloni
Candida albicans is a commensal organism, commonly inhabiting mucosal surfaces of healthy individuals, as a part of the resident microbiota. However, in susceptible hosts, especially hospitalized and/or immunocompromised patients, it may cause a wide range of infections. The presence of abiotic substrates, such as central venous or urinary catheters, provides an additional niche for Candida attachment and persistence, particularly via biofilm development. Furthermore, Candida biofilm is poorly susceptible to most antifungals, including azoles...
2017: PloS One
https://www.readbyqxmd.com/read/28674314/candida-tropicalis-biofilm-formation-and-efficacy-of-liposomal-amphotericin-b-using-time-lapse-images
#2
Akira Kawai, Yuka Yamagishi, Hiroshige Mikamo
Candida species bloodstream infection such as candidemia remains a significant with high morbidity and mortality. Bloodstream infections caused by Candida species is often associated with the ability of Candida to form biofilms by using medical devices, such as central venous catheters. Non-albicans Candida species are increasing gradually in recent clinical practices. One of the Candida species, C. tropicalis, is likely to form biofilms and is also an independent risk factor with high morbidity and mortality in hospitalized patients...
July 1, 2017: Japanese Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28656173/heparin-mimics-extracellular-dna-in-binding-to-cell-surface-localized-proteins-and-promoting-staphylococcus-aureus-biofilm-formation
#3
Surabhi Mishra, Alexander R Horswill
Staphylococcus aureus is a leading cause of catheter-related bloodstream infections. Biofilms form on these implants and are held together by a matrix composed of proteins, polysaccharides, and extracellular DNA (eDNA). Heparin is a sulfated glycosaminoglycan that is routinely used in central venous catheters to prevent thrombosis, but it has been shown to stimulate S. aureus biofilm formation through an unknown mechanism. Data presented here reveal that heparin enhances biofilm capacity in many S. aureus and coagulase-negative staphylococcal strains, and it is incorporated into the USA300 methicillin-resistant S...
May 2017: MSphere
https://www.readbyqxmd.com/read/28482226/microbially-and-phytofabricated-agnps-with-different-mode-of-bactericidal-action-were-identified-to-have-comparable-potential-for-surface-fabrication-of-central-venous-catheters-to-combat-staphylococcus-aureus-biofilm
#4
Roshmi Thomas, Shiji Mathew, A R Nayana, Jyothis Mathews, E K Radhakrishnan
In spite of newer innovations and process improvements, catheter related infections still pose serious threat to hospitalized patients. Silver nanoparticles (AgNPs) are well demonstrated to have antibacterial properties and also have been implemented for surface fabrication of many indwelling medical devices. So, herein we sought to compare the performance of AgNPs generated through biogenic routes using bacteria and plant extract for their antibacterial and antibiofilm potential against biofilm forming Staphylococcus aureus...
June 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28453851/eradication-of-staphylococcus-aureus-biofilm-infections-using-synthetic-antimicrobial-peptides
#5
Marta Zapotoczna, Éanna Forde, Siobhan Hogan, Hilary Humphreys, James P O'Gara, Deirdre Fitzgerald-Hughes, Marc Devocelle, Eoghan O'Neill
Here, we demonstrate that antimicrobial peptides (AMPs) are an effective antibiofilm treatment when applied as catheter lock solutions (CLSs) against S. aureus biofilm infections. The activity of synthetic AMPs (Bac8c, HB43, P18, Omiganan, WMR, Ranalexin, and Polyphemusin) was measured against early and mature biofilms produced by methicillin-resistant S. aureus and methicillin-susceptible S. aureus isolates from patients with device-related infections grown under in vivo-relevant biofilm conditions. The cytotoxic and hemolytic activities of the AMPs against human cells and their immunomodulatory potential in human blood were also characterized...
March 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28438824/comparison-of-linezolid-and-vancomycin-lock-solutions-with-and-without-heparin-against-biofilm-producing-bacteria
#6
Megan K Luther, Leonard A Mermel, Kerry L LaPlante
PURPOSE: The activity of linezolid and vancomycin lock solutions against biofilm-producing strains of Staphylococcus aureus, S. epidermidis, and Enterococcus faecalis was studied. METHODS: Two strains each of methicillin-susceptible S. aureus (MSSA), methicillin-resistant S. aureus (MRSA), and S. epidermidis, and 1 strain of vancomycin-susceptible E. faecalis and vancomycin-resistant E. faecalis were tested against vancomycin and linezolid to assess prevention of biofilm formation and eradication of these pathogens within a formed biofilm...
May 1, 2017: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/28433610/paraoxonases-and-infectious-diseases
#7
REVIEW
Jordi Camps, Simona Iftimie, Anabel García-Heredia, Antoni Castro, Jorge Joven
The paraoxonases (PON1, PON2 and PON3) are an enzyme family with a high structural homology. All of them have lactonase activity and degrade lipid peroxides in lipoproteins and cells. As such, they play a role in protection against oxidation and inflammation. Infectious diseases are often associated with oxidative stress and an inflammatory response. Infection and inflammation trigger a cascade of reactions in the host, known as the acute-phase response. This response is associated with dramatic changes in serum proteins and lipoproteins, including a decrease in serum PON1 activity...
April 19, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28416559/a-novel-nonantibiotic-nitroglycerin-based-catheter-lock-solution-for-prevention-of-intraluminal-central-venous-catheter-infections-in-cancer-patients
#8
Anne-Marie Chaftari, Ray Hachem, Ariel Szvalb, Mahnaz Taremi, Bruno Granwehr, George Michael Viola, Amin Sapna, Andrew Assaf, Yazan Numan, Pankil Shah, Ketevan Gasitashvili, Elizabeth Natividad, Ying Jiang, Rebecca Slack, Ruth Reitzel, Joel Rosenblatt, Elie Mouhayar, Issam Raad
For long-term central lines (CL), the lumen is the major source of central line-associated bloodstream infections (CLABSI). The current standard of care for maintaining catheter patency includes flushing the CL with saline or heparin. Neither agent has any antimicrobial activity. Furthermore, heparin may enhance staphylococcal biofilm formation. We evaluated the safety and efficacy of a novel nonantibiotic catheter lock solution for the prevention of CLABSI. Between November 2015 and February 2016, we enrolled 60 patients with hematologic malignancies who had peripherally inserted central catheters (PICC) to receive the study lock solution...
July 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28407421/central-venous-catheters-and-biofilms-where-do-we-stand-in-2017
#9
REVIEW
Marie Gominet, Fabrice Compain, Christophe Beloin, David Lebeaux
The use of central venous catheters (CVC) is associated with a risk of microbial colonization and subsequent potentially severe infection. Microbial contamination of the catheter leads to the development of a microbial consortia associated with the CVC surface and embedded in an extracellular matrix, named biofilm. This biofilm provides bacterial cells the ability to survive antimicrobial agents and the host immune system and to disseminate to other sites of the body. The best preventive strategy is to avoid any unnecessary catheterization or to reduce indwelling duration when a CVC is required...
April 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/28205241/septic-transfusion-case-caused-by-a-platelet-pool-with-visible-clotting-due-to-contamination-with-staphylococcus-aureus
#10
Maria Loza-Correa, Yuntong Kou, Mariam Taha, Miloslav Kalab, Jennifer Ronholm, Patrick M Schlievert, Michael P Cahill, Robert Skeate, Christine Cserti-Gazdewich, Sandra Ramirez-Arcos
BACKGROUND: Contamination of platelet concentrates (PCs) with Staphylococcus aureus is one of the most significant ongoing transfusion safety risks in developed countries. CASE REPORT: This report describes a transfusion reaction in an elderly patient diagnosed with acute myeloid leukemia, transfused with a 4-day-old buffy coat PC through a central venous catheter. The transfusion was interrupted when a large fibrous clot in the PC obstructed infusion pump flow...
May 2017: Transfusion
https://www.readbyqxmd.com/read/28118144/development-of-x-ray-micro-focus-computed-tomography-to-image-and-quantify-biofilms-in-central-venous-catheter-models-in-vitro
#11
Wilmari L Niehaus, Robert P Howlin, David A Johnston, Daniel J Bull, Gareth L Jones, Elizabeth Calton, Mark N Mavrogordato, Stuart C Clarke, Philipp J Thurner, Saul N Faust, Paul Stoodley
Bacterial infections of central venous catheters (CVCs) cause much morbidity and mortality, and are usually diagnosed by concordant culture of blood and catheter tip. However, studies suggest that culture often fails to detect biofilm bacteria. This study optimizes X-ray micro-focus computed tomography (X-ray µCT) for the quantification and determination of distribution and heterogeneity of biofilms in in vitro CVC model systems. Bacterial culture and scanning electron microscopy (SEM) were used to detect Staphylococcus epidermidis ATCC 35984 biofilms grown on catheters in vitro in both flow and static biofilm models...
December 30, 2016: Microbiology
https://www.readbyqxmd.com/read/27821454/sustained-nitric-oxide-releasing-nanoparticles-interfere-with-methicillin-resistant-staphylococcus-aureus-adhesion-and-biofilm-formation-in-a-rat-central-venous-catheter-model
#12
Mircea Radu Mihu, Vitor Cabral, Rodney Pattabhi, Moses T Tar, Kelvin P Davies, Adam J Friedman, Luis R Martinez, Joshua D Nosanchuk
Staphylococcus aureus is frequently isolated in the setting of infections of indwelling medical devices, which are mediated by the microbe's ability to form biofilms on a variety of surfaces. Biofilm-embedded bacteria are more resistant to antimicrobial agents than their planktonic counterparts and often cause chronic infections and sepsis, particularly in patients with prolonged hospitalizations. In this study, we demonstrate that sustained nitric oxide-releasing nanoparticles (NO-np) interfere with S. aureus adhesion and prevent biofilm formation on a rat central venous catheter (CVC) model of infection...
January 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27663229/co-release-of-dicloxacillin-and-thioridazine-from-catheter-material-containing-an-interpenetrating-polymer-network-for-inhibiting-device-associated-staphylococcus-aureus-infection
#13
Michael Stenger, Kasper Klein, Rasmus B Grønnemose, Janne K Klitgaard, Hans J Kolmos, Jes S Lindholt, Martin Alm, Peter Thomsen, Thomas E Andersen
Approximately half of all nosocomial bloodstream infections are caused by bacterial colonization of vascular catheters. Attempts have been made to improve devices using anti-adhesive or antimicrobial coatings; however, it is often difficult to bind coatings stably to catheter materials, and the low amounts of drug in thin-film coatings limit effective long-term release. Interpenetrating polymer networks (IPNs) are polymer hybrid materials with unique drug release properties. While IPNs have been extensively investigated for use in tablet- or capsule-based drug delivery systems, the potential for use of IPNs in drug release medical devices remains largely unexplored...
November 10, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/27648205/outcome-of-candida-parapsilosis-complex-infections-treated-with-caspofungin-in-children
#14
İlker Devrim, Rana İşgüder, Hasan Ağın, Gökhan Ceylan, Yüce Ayhan, Özlem Sara Sandal, Ferhat Sarı, Ahu Kara, Mine Düzgöl, Gamze Gülfidan, Nuri Bayram
BACKGROUND: We aimed to evaluate the correlation of caspofungin E-tests with the prognosis and response to caspofungin therapy of Candida parapsilosis complex bloodstream infections in children hospitalized in a pediatric intensive care unit. METHODS: All children who had C. parapsilosis complex bloodstream infections and who were treated with caspofungin were included in this retrospective study. For each patient, the following parameters, including all consecutive blood and central venous catheter (CVC) cultures, the duration between diagnosis and CVC removal, mortality rate, relapses of the C...
2016: Mediterranean Journal of Hematology and Infectious Diseases
https://www.readbyqxmd.com/read/27624133/global-identification-of-biofilm-specific-proteolysis-in-candida-albicans
#15
Michael B Winter, Eugenia C Salcedo, Matthew B Lohse, Nairi Hartooni, Megha Gulati, Hiram Sanchez, Julie Takagi, Bernhard Hube, David R Andes, Alexander D Johnson, Charles S Craik, Clarissa J Nobile
UNLABELLED: Candida albicans is a fungal species that is part of the normal human microbiota and also an opportunistic pathogen capable of causing mucosal and systemic infections. C. albicans cells proliferate in a planktonic (suspension) state, but they also form biofilms, organized and tightly packed communities of cells attached to a solid surface. Biofilms colonize many niches of the human body and persist on implanted medical devices, where they are a major source of new C. albicans infections...
September 13, 2016: MBio
https://www.readbyqxmd.com/read/27516141/evidence-based-criteria-for-the-choice-and-the-clinical-use-of-the-most-appropriate-lock-solutions-for-central-venous-catheters-excluding-dialysis-catheters-a-gavecelt-consensus
#16
REVIEW
Mauro Pittiruti, Sergio Bertoglio, Giancarlo Scoppettuolo, Roberto Biffi, Massimo Lamperti, Alberto Dal Molin, Nicola Panocchia, Nicola Petrosillo, Mario Venditti, Carla Rigo, Enrico DeLutio
BACKGROUND: The most appropriate lock solution for central venous access devices is still to be defined. GAVeCeLT - the Italian group for venous access devices - has developed a consensus on the evidence-based criteria for the choice and the clinical use of the most appropriate lock solution for central venous catheters (excluding dialysis catheters). METHOD: After the constitution of a panel of experts, a systematic collection and review of the literature has been performed, focusing on clinical studies dealing with lock solutions used for prevention of occlusion (heparin, citrate, urokinase, recombinant tissue plasminogen activator [r-TPA], normal saline) or for prevention of infection (citrate, ethanol, taurolidine, ethylene-diamine-tetra-acetic acid [EDTA], vancomycin, linezolid and other antibiotics), in both adults and in pediatric patients...
November 2, 2016: Journal of Vascular Access
https://www.readbyqxmd.com/read/27384949/development-of-x-ray-micro-focus-computed-tomography-to-image-and-quantify-biofilms-in-central-venous-catheter-models-in-vitro
#17
Wilmari L Niehaus, Robert Paul Howlin, David A Johnston, Daniel J Bull, Gareth L Jones, Elizabeth Calton, M N Mavrogordato, Stuart C Clarke, P J Thurner, Saul Nicholas Faust, P Stoodley
Bacterial infections of central venous catheters (CVCs) cause much morbidity and mortality, and are usually diagnosed by concordant culture of blood and catheter tip. However, studies suggest that culture often fails to detect biofilm bacteria. This study optimises X-ray micro computed tomography (X-ray µCT) for the quantification and determination of distribution and heterogeneity of biofilms in in vitro central venous catheter (CVC) model systems.Bacterial culture and scanning electron microscopy (SEM) were used to detect Staphylococcus epidermidis ATCC 35984 biofilms grown on catheters in vitro in both flow and static biofilm models...
July 6, 2016: Microbiology
https://www.readbyqxmd.com/read/27234944/vascular-catheter-colonization-surveillance-based-on-culture-of-needleless-connectors
#18
María Jesús Pérez-Granda, María Guembe, Raquel Cruces, Emilio Bouza
BACKGROUND: Superficial culture has a high negative predictive value in the assessment of catheter tip colonization (CC) and catheter-related bloodstream infection (C-RBSI). However, the process of hub culture requires the hubs to be swabbed, and this carries a risk of dislodging the biofilm. At present, most catheter hubs are closed by needleless connectors (NCs) that are periodically replaced. Our objective was to compare the yield of SC (skin + hub culture) with that of skin + NC culture in the assessment of CC and C-RBSI...
May 28, 2016: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/27196636/characterizing-the-in-vitro-biofilm-phenotype-of-staphylococcus-epidermidis-isolates-from-central-venous-catheters
#19
Marian Van Kerckhoven, An Hotterbeekx, Ellen Lanckacker, Pieter Moons, Christine Lammens, Monique Kerstens, Margareta Ieven, Peter Delputte, Philippe G Jorens, Surbhi Malhotra-Kumar, Herman Goossens, Louis Maes, Paul Cos
Central venous catheter (CVC)-related infections are commonly caused by Staphylococcus epidermidis that is able to form a biofilm on the catheter surface. Many studies involving biofilm formation by Staphylococcus have been published each adopting an own in vitro model. Since the capacity to form a biofilm depends on multiple environmental factors, direct comparison of results obtained in different studies remains challenging. This study characterized the phenotype (strong versus weak biofilm-producers) of S...
August 2016: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/27001822/successful-salvage-of-central-venous-catheters-in-patients-with-catheter-related-or-central-line-associated-bloodstream-infections-by-using-a-catheter-lock-solution-consisting-of-minocycline-edta-and-25-ethanol
#20
Issam Raad, Anne-Marie Chaftari, Ramia Zakhour, Mary Jordan, Zanaib Al Hamal, Ying Jiang, Ammar Yousif, Kumait Garoge, Victor Mulanovich, George M Viola, Soha Kanj, Egbert Pravinkumar, Joel Rosenblatt, Ray Hachem
In cancer patients with long-term central venous catheters (CVC), removal and reinsertion of a new CVC at a different site might be difficult because of the unavailability of accessible vascular sites. In vitro and animal studies showed that a minocycline-EDTA-ethanol (M-EDTA-EtOH) lock solution may eradicate microbial organisms in biofilms, hence enabling the treatment of central line-associated bloodstream infections (CLABSI) while retaining the catheter in situ Between April 2013 and July 2014, we enrolled 30 patients with CLABSI in a prospective study and compared them to a historical group of 60 patients with CLABSI who had their CVC removed and a new CVC inserted...
June 2016: Antimicrobial Agents and Chemotherapy
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