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Daptomycin

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https://www.readbyqxmd.com/read/29777985/liquid-chromatography-tandem-mass-spectrometry-for-the-quantification-of-moxifloxacin-ciprofloxacin-daptomycin-caspofungin-and-isavuconazole-in-human-plasma
#1
Julian Hösl, André Gessner, Nahed El-Najjar
A simple and precise ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was developed for the simultaneous analysis of five anti-infective agents used to treat severe infections [three antibiotics (daptomycin, moxifloxacin, ciprofloxacin) and two antifungals (isavuconazole, caspofungin)] in human plasma. Sample preparation was based on protein precipitation with ice cold methanol. All five agents were analyzed with the corresponding isotopically labeled internal standards. All analytes were detected in multiple reactions monitoring (MRM) using API 4000 triple-quadrupole mass spectrometer with electrospray (ESI) source operating in positive mode...
May 12, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29765236/methicillin-resistant-staphylococcus-aureus-bacteremia-among-liver-transplant-recipients-epidemiology-and-associated-risk-factors-for-morbidity-and-mortality
#2
REVIEW
Taohua Liu, Yuezhong Zhang, Qiquan Wan
Bacteremia due to Staphylococcus aureus , especially methicillin-resistant S. aureus (MRSA), complicates the clinical course of liver transplantation and is associated with high morbidity and mortality. Intravascular catheters had been reported to be the most frequent source of MRSA bacteremia. Among bacteremic liver recipients, 26.3%-100% of S. aureus were MRSA. Previous studies identified pre-transplant and post-transplant acquired S. aureus carriage, greater severity of liver disease, hepatocellular carcinoma and infection with immuno-modulatory viruses as predictors of S...
2018: Infection and Drug Resistance
https://www.readbyqxmd.com/read/29760141/efficacy-of-daptomycin-monotherapy-and-in-combination-with-%C3%AE-lactams-for-daptomycin-susceptible-enterococcus-faecium-harboring-liasr-substitutions-influence-of-the-inoculum-effect
#3
Razieh Kebriaei, Seth A Rice, Kavindra V Singh, Kyle C Stamper, An Q Dinh, Rafael Rios, Lorena Diaz, Barbara E Murray, Jose M Munita, Truc T Tran, Cesar A Arias, Michael J Rybak
Enterococcus faecium that harbor LiaFSR substitutions but are phenotypically susceptible to daptomycin (DAP) by current breakpoints are problematic since predisposition to resistance may lead to therapeutic failure. Using a simulated endocardial vegetation (SEV) PK/PD model, we investigated DAP regimens (6, 8 and 10 mg/kg/day) as monotherapy and in combination with ampicillin (AMP), ceftaroline (CPT) or ertapenem (ERT) against E. faecium HOU503, a DAP-susceptible strain that harbors common LiaS and LiaR substitutions found in clinical isolates (T120S and W73C, respectively)...
May 14, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29753135/daptomycin-and-vancomycin-heteroresistance-revealed-among-cc5-sccmecii-mrsa-clone-and-in-vitro-evaluation-of-treatment-alternatives
#4
Jessica Baleiro Okado, Juliana Sposto Avaca-Crusca, Alexandre Lima Oliveira, Andrei Nicoli Gebieluca Dabul, Ilana Lopes Baratella da Cunha Camargo
INTRODUCTION: Methicillin-resistant Staphylococcus aureus (MRSA) is a threat to clinical treatment. Besides high resistance, presence of heterogeneous vancomycin intermediate S. aureus (hVISA) and heterogeneous daptomycin non-susceptible S. aureus (hDNSSA) in the hospital environment are underestimated and associated with treatment failure. OBJECTIVES: To investigate a MRSA dissemination in a Brazilian hospital and to evaluate the efficacy of some treatment options in vitro...
May 9, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29744925/microcalorimetric-detection-of-staphylococcal-biofilm-growth-on-various-prosthetic-biomaterials-after-exposure-to-daptomycin
#5
Christen Ravn, Inês Santos Ferreira, Elena Maiolo, Søren Overgaard, Andrej Trampuz
Primary aim of this in vitro study was to test the efficacy of daptomycin to eradicate staphylococcal biofilms on various orthopedic implant materials. Secondary aim was to quantitatively estimate the formation of staphylococcal biofilm. We tested six clinically important biomaterials: cobalt chrome, pure titanium, grid-blasted titanium, porous plasma-coated titanium with/without hydroxyapatite, and polyethylene. Biofilms of S. aureus and S. epidermidis were formed on the samples and thereafter exposed to daptomycin...
May 10, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29735840/-in-vitro-analysis-of-the-minimal-inhibitory-concentration-values-of-different-generations-of-anti-methicillin-resistant-staphylococcus-aureus-antibiotics
#6
Aneta Guzek, Zbigniew Rybicki, Dariusz Tomaszewski
Methicillin-resistant Staphylococcus aureus (MRSA) resistance to antimicrobials may result in the increased risk of treatment failure. The objective of the study was to analyse in vitro MRSA susceptibility to vancomycin, linezolid, daptomycin, tigecycline, ceftaroline, dalbavancin, clindamycin, ciprofloxacin and trimethoprim/sulfamethoxazole. All MRSA strains isolated from hospitalised patients were analysed according to the current microbiological recommendations. Finally, a total of 124 MRSA strains were analysed; all were susceptible to tested antibiotics...
January 2018: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29735564/failure-of-daptomycin-to-kill-staphylococcus-aureus-impact-of-bacterial-membrane-fatty-acid-composition
#7
Rym Boudjemaa, Clément Cabriel, Florence Dubois-Brissonnet, Nicolas Bourg, Guillaume Dupuis, Alexandra Gruss, Sandrine Lévêque-Fort, Romain Briandet, Marie-Pierre Fontaine-Aupart, Karine Steenkeste
Daptomycin is a last-resort membrane-targeting lipopeptide approved for the treatment of drug-resistant staphylococcal infections such as bacteraemia and implant-related infections. Although cases of resistance to this antibiotic are rare, increasing clinical, in vitro and animal studies report treatment failure, notably against Staphylococcus aureus The aim of this study was to identify the features of daptomycin and its target bacteria that lead to daptomycin treatment failure. We show that daptomycin bactericidal activity against S...
May 7, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29718242/daptomycin-selects-for-genetic-and-phenotypic-adaptations-leading-to-antibiotic-tolerance-in-mrsa
#8
Andrew D Berti, Neehal Shukla, Aaron D Rottier, J Sue McCrone, Hannah M Turner, Ian R Monk, Sarah L Baines, Benjamin P Howden, Richard A Proctor, Warren E Rose
Objectives: Daptomycin non-susceptibility in Staphylococcus aureus can emerge via the accumulation of single or multiple mutations, each resulting in a slight increase in the daptomycin MIC. The daptomycin-non-susceptible phenotype may include other features such as daptomycin tolerance. This study identifies S. aureus genomic regions that frequently develop mutations following prolonged daptomycin exposure but have not been previously associated with daptomycin non-susceptibility. Methods: Sequence variations in the same eight loci independently observed following 28 day parallel serial passages of S...
April 27, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29712650/activity-of-combinations-of-antistaphylococcal-antibiotics-with-fusidic-acid-against-staphylococcal-biofilms-in-in-vitro-static-and-dynamic-models
#9
Wafi Siala, Hector Rodriguez-Villalobos, Prabhavathi Fernandes, Paul M Tulkens, Françoise Van Bambeke
Staphylococcal biofilms are a major cause of therapeutic failure, especially when caused by multiresistant strains. Oral fusidic acid is currently being re-developed in the US for skin and skin structure and orthopedic infections, in which biofilms play a major role. The aim of this study was to examine the activity of fusidic acid alone or combined with other anti-staphylococcal drugs against biofilms made by a reference strain and five clinical isolates of Staphylococcus aureus or Staphylococcus epidermidis in in vitro static or dynamic models (microtiter plates and CDC reactor) exposed to clinically-relevant concentrations...
April 30, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29708837/molecular-epidemiology-of-vancomycin-resistant-enterococcus-faecalis-and-enterococcus-faecium-isolated-from-clinical-specimens-in-the-northwest-of-iran
#10
Ali Jahansepas, Mohammad Ahangarzadeh Rezaee, Alka Hasani, Yaeghob Sharifi, Marjan Rahnamaye Farzami, Alireza Dolatyar, Mohammad Aghazadeh
This study was conducted to investigate the phenotypic and genotypic characteristics of vancomycin-resistant Enterococcus faecalis and Enterococcus faecium. Antibiotic resistance and virulence genes in the aforementioned resistant isolates were studied using the epsilometer (E)-test and polymerase chain reaction (PCR). These isolates were subjected to typing by pulsed-field gel electrophoresis (PFGE). Thirty vancomycin-resistant enterococci (VRE; 18.75%) were isolated from a total of 160 various clinical specimens cultured for any bacterial growth...
April 30, 2018: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/29695923/antibiotic-sensitivities-of-coagulase-negative-staphylococci-and-staphylococcus-aureus-in-hip-and-knee-periprosthetic-joint-infections-does-this-differ-if-patients-meet-the-international-consensus-meeting-criteria
#11
Elena De Vecchi, David A George, Carlo L Romanò, Fabrizio E Pregliasco, Roberto Mattina, Lorenzo Drago
Introduction: Coagulase-negative staphylococci (CoNS) are the main pathogens responsible for prosthetic joint infections (PJIs). As normal inhabitants of human skin, it is often difficult to define if they are contaminants, or if they have an active role in initiating infection. This study aims to evaluate differences in CoNS organisms ( Staphylococcus hominis, Staphylococcus capitis , Staphylococcus haemolyticus , Staphylococcus warneri) and Staphylococcus aureus in terms of isolation rate and antimicrobial susceptibility from patients who met the International Consensus Meeting (ICM) criteria for PJIs and those who did not...
2018: Infection and Drug Resistance
https://www.readbyqxmd.com/read/29692578/vancomycin-linezolid-and-daptomycin-susceptibility-pattern-among-clinical-isolates-of-methicillin-resistant-staphylococcus-aureus-mrsa-from-sub-himalyan-center
#12
Afzal Husain, Vinita Rawat, Umesh, Mukesh Kumar, Pankaj Kumar Verma
INTRODUCTION: The efficacy of vancomycin, drug of choice for methicillin-resistant Staphylococcus aureus (MRSA), has become questionable due to the emergence of MRSA isolates with reduced susceptibility. The present study was conducted to determine the vancomycin, linezolid, and daptomycin susceptibility pattern in clinical isolates of MRSA and to observe minimum inhibitory concentration (MIC) creep over 2 years if any. MATERIALS AND METHODS: MIC of vancomycin, linezolid, and daptomycin were determined by E-test in 198 MRSA isolates and their MIC 50, MIC 90, and geometric mean MIC were calculated...
April 2018: Journal of Laboratory Physicians
https://www.readbyqxmd.com/read/29690991/-treatment-of-vancomycin-resistant-enterococcal-infections
#13
Lars Christian Lund, Barbara Juliane Holzknecht, Ulrik Stenz Justesen
Vancomycin-resistant enterococci (VRE) are a growing healthcare concern, and since 2012 the incidence has increased eightfold in Denmark. Treatment options for infections with ampicillin-resistant VRE are sparse, and there are no Danish guidelines concerning this topic. For treatment of uncomplicated VRE urinary tract infections, ciprofloxacin or nitrofurantoin can be used. The mainstay of treatment of bacteraemia and other severe infections caused by VRE is linezolid or high-dose daptomycin. Combination treatment is recommended for complicated infections and/or prolonged therapy...
April 16, 2018: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/29668884/statin-coadministration-increases-the-risk-of-daptomycin-associated-myopathy
#14
Ryan K Dare, Chad Tewell, Bryan Harris, Patty W Wright, Sara L Van Driest, Eric Farber-Eger, George E Nelson, Thomas R Talbot
Background: Daptomycin-associated myopathy has been identified in 2-14% of patients, and rhabdomyolysis is a known adverse effect. Although risk factors for daptomycin-associated myopathy are poorly defined, creatine phosphokinase (CPK) monitoring and temporary discontinuation of HMG-CoA reductase inhibitors, or "statins", has been recommended. Methods: We conducted a single-center, retrospective, matched case-control risk factor analysis in adult and pediatric patients from 2004-2015...
April 16, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29661029/antimicrobial-stewardship-program-in-a-greek-hospital-implementing-a-mandatory-prescription-form-and-prospective-audits
#15
Vassiliki Pitiriga, Petros Kanellopoulos, Elsa Kampos, George Panagiotakopoulos, Athanasios Tsakris, George Saroglou
AIM: Antimicrobial stewardship programs (ASPs) are urgently needed for Greek hospitals in order to improve antibiotic usage. PATIENTS & METHODS: An ASP was implemented to a Greek hospital since February 2014. A mandatory order form was introduced for five antimicrobials; colistin, tigecycline, daptomycin, doripenem and linezolid. Prospective audits allowed for feedback to the prescribers without direct prescribing restriction. RESULTS: Antimicrobials' consumption at the baseline year and the 3 years of ASP implementation was 93...
April 17, 2018: Future Microbiology
https://www.readbyqxmd.com/read/29651552/prevention-of-high-level-daptomycin-resistance-emergence-in-vitro-in-streptococcus-mitis-oralis-by-using-combination-antimicrobial-strategies
#16
Brianne Zapata, Danya N Alvarez, Sabrina Farah, Cristina Garcia-de-la-Maria, Jose M Miro, George Sakoulas, Arnold S Bayer, Nagendra N Mishra
Among the viridans group streptococci, S. mitis-oralis strains are frequently resistant to multiple β-lactams and tolerant to vancomycin (VAN). This scenario has led to the proposed clinical use of newer agents, like daptomycin (DAP) for such S. mitis-oralis strains. However, recent recognition of the rapid and durable emergence of high-level DAP-resistance (DAP-R; DAP MICs > 256 µg/ml) induced by DAP exposures in vitro and in vivo has dampened enthusiasm for such approaches. In this study, we evaluated a broad range of DAP combination regimens in vitro for their capacity to prevent emergence of high-level DAP-R in a prototype S...
April 12, 2018: Current Microbiology
https://www.readbyqxmd.com/read/29649601/adjuvant-non-bacteriolytic-and-anti-inflammatory-combination-therapy-in-pneumococcal-meningitis-an-investigation-in-a-mouse-model
#17
M Klein, C Höhne, B Angele, T Högen, H W Pfister, H Tüfekci, U Koedel
OBJECTIVES: Therapy with antibiotics, dexamethasone, and supportive intensive care has improved the prognosis of pneumococcal meningitis, but mortality remains high. Here, we investigated an adjunctive combination therapy of the non-bacteriolytic antibiotic daptomycin plus several anti-inflammatory agents to identify the currently most promising adjunctive combination therapy for pneumococcal meningitis. METHODS: C57BL/6 mice were infected by injection of pneumococci into the cisterna magna...
April 9, 2018: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29627322/lipopeptide-daptomycin-interactions-with-bacterial-and-phospholipid-membranes-stability-of-membrane-aggregates-and-micellation-in-solution
#18
Bin Liu, Mikko Karttunen
Daptomycin is a cyclic lipopeptide effective against multidrug Gram-positive bacteria. Despite having a net negative charge, it is selective against negatively charged bacterial membranes. It has been established that daptomycin's antibiotic activity is based on directly targeting the bacterial membranes and that this antibacterial activity depends on calcium ions. Importantly, however, both the precise role of ions and the physical mechanisms responsible for daptomycin's action remain poorly understood. We investigate these issues using three types of molecular dynamics simulations: umbrella sampling free energy calculations for a single daptomycin, unbiased simulations for daptomycin tetramers, and unbiased simulations of micellation of daptomycin both in the absence and presence of calcium ions...
April 5, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29617860/whole-genome-sequencing-based-characterization-of-antimicrobial-resistance-in-enterococcus
#19
Gregory H Tyson, Jonathan L Sabo, Crystal Rice-Trujillo, Jacqueline Hernandez, Patrick F McDermott
Whole-genome sequencing (WGS) has transformed our understanding of antimicrobial resistance, yielding new insights into the genetics underlying resistance. To date, most studies using WGS to study antimicrobial resistance have focused on gram-negative bacteria in the family Enterobacteriaceae, such as Salmonella spp. and Escherichia coli, which have well-defined resistance mechanisms. In contrast, relatively few studies have been performed on gram-positive organisms. We sequenced 197 strains of Enterococcus from various animal and food sources, including 100 Enterococcus faecium and 97 E...
March 1, 2018: Pathogens and Disease
https://www.readbyqxmd.com/read/29616488/daptomycin-proliposomes-for-oral-delivery-formulation-characterization-and-in-vivo-pharmacokinetics
#20
Javier Rueda Arregui, Surya Prakasarao Kovvasu, Guru V Betageri
The aim of this study was to develop a proliposomal formulation of lipopeptide antibiotic drug daptomycin (DAP) for oral delivery. Thin film hydration was the selected method for preparation of proliposomes. Different phospholipids including soy-phosphatidylcholine (SPC), hydrogenated egg-phosphatidylcholine (HEPC), and distearoyl-phosphatidylcholine (DSPC) were evaluated in combination with cholesterol. The inclusion of surface charge modifiers in the formulation such as dicetyl phosphate (DCP) and stearylamine (SA) to enhance drug encapsulation was also evaluated...
April 3, 2018: AAPS PharmSciTech
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