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https://www.readbyqxmd.com/read/28707312/selective-pd-ii-catalyzed-carbonylation-of-methylene-beta-c-h-bonds-in-aliphatic-amines
#1
Matthew James Gaunt, Jaime Cabrera-Pardo, Aaron Trowbridge, Manuel Nappi, Kyohei Ozaki
Pd(II)-catalyzed C-H carbonylation of methylene C-H bonds in secondary aliphatic amines leads to the formation trans-disubstituted beta-lactams in excellent yields and selectivities. The generality of the C-H carbonylation process is aided by the action of xantphos-based ligands and is important in securing good yields of the beta-lactam products.
July 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28706447/treatment-patterns-resource-utilization-and-outcomes-among-hospitalized-patients-with-methicillin-resistant-staphylococcus-aureus-complicated-skin-and-soft-tissue-infections-in-lebanon-and-saudi-arabia
#2
Madonna J Matar, Rima Moghnieh, Adel F Alothman, Abdulhakeem O Althaqafi, Thamer H Alenazi, Fayssal M Farahat, Shelby Corman, Caitlyn T Solem, Nirvana Raghubir, Cynthia Macahilig, Seema Haider, Jennifer M Stephens
OBJECTIVES: To describe treatment patterns and medical resource use for methicillin-resistant Staphylococcus aureus (MRSA) complicated skin and soft tissue infections (cSSTI) in Saudi Arabia and Lebanon in terms of drug selection against the infecting pathogen as well as hospital resource utilization and clinical outcomes among patients with these infections. METHODS: This retrospective chart review study evaluated 2011-2012 data from five hospitals in Saudi Arabia and Lebanon...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28702304/oral-versus-intravenous-clarithromycin-in-moderate-to-severe-community-acquired-pneumonia-an-observational-study
#3
Nikolas Rae, Aran Singanayagam, Stuart Schembri, James D Chalmers
OBJECTIVES: British Thoracic Society guidelines recommend clarithromycin in addition to beta-lactam antibiotics for patients with community-acquired pneumonia and CURB-65 score 2-5. Intravenous therapy is commonly used but there are few data on whether oral therapy is equally effective. METHODS: This observational study used propensity matching to compare two groups of patients with moderate to severe community-acquired pneumonia (CURB-65 score 2-5) treated with oral (n = 226) or intravenous (n = 226) clarithromycin on admission...
2017: Pneumonia
https://www.readbyqxmd.com/read/28699429/the-order-of-administration-of-macrolides-and-beta-lactams-may-impact-the-outcomes-of-hospitalized-patients-with-community-acquired-pneumonia-results-from-the-community-acquired-pneumonia-organization
#4
Paula Peyrani, Timothy L Wiemken, Mark L Metersky, Forest W Arnold, William A Mattingly, Charles Feldman, Rodrigo Cavallazzi, Rafael Fernandez-Botran, Jose Bordon, Julio A Ramirez
BACKGROUND: The beneficial effect of macrolides for the treatment of community-acquired pneumonia (CAP) in combination with beta-lactams may be due to their anti-inflammatory activity. In patients with pneumococcal meningitis, the use of steroids improves outcomes only if they are administered before beta-lactams. The objective of this study was to compare outcomes in hospitalized patients with CAP when macrolides were administered before, simultaneously with, or after beta-lactams. METHODS: Secondary data analysis of the Community-Acquired Pneumonia Organization (CAPO) International Cohort Study database...
July 12, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28694235/clinical-benefits-of-antimicrobial-de-escalation-in-adults-with-community-onset-monomicrobial-escherichia-coli-klebsiella-species-and-proteus-mirabilis-bacteremia
#5
Ching-Chi Lee, Jiun-Ling Wang, Chung-Hsun Lee, Yuan-Pin Hung, Ming-Yuan Hong, Hung-Jen Tang, Wen-Chien Ko
The clinical benefits of an antimicrobial de-escalation strategy were compared with those of a no-switch strategy in bacteremic patients. Adults with community-onset monomicrobial Escherichia coli, Klebsiella species and Proteus mirabilis bacteremia treated empirically using broad-spectrum beta-lactams, including third-generation cephalosporins (GCs), fourth-GC or carbapenems, were treated definitively with first- or second-GCs (de-escalation group), the same regimens as empirical antibiotics (no-switch group), or antibiotics with a broader-spectrum than empirical antibiotics (escalation group)...
July 7, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28692817/complications-of-hematopoietic-stem-transplantation-bacterial-infections
#6
REVIEW
Ali S Omrani, Reem S Almaghrabi
Bacterial infections remain a common complication of hematopoietic stem cell transplantation (HSCT), especially in the pre-engraftment phase. The risk of bacterial infections is mainly related to neutropenia, mucositis, and the presence of vascular lines. Most parts of the world have witnessed a shift in epidemiology toward Gram-negative bacteria; a large proportion of which are resistant to fluoroquinolones, extended-spectrum beta-lactams, carbapenems, and in some units even colistin. Meticulous infection control practices are essential for prevention of bacterial infections in HSCT...
July 3, 2017: Hematology/oncology and Stem Cell Therapy
https://www.readbyqxmd.com/read/28692690/risk-of-surgical-site-infection-acute-kidney-injury-and-clostridium-difficile-infection-following-antibiotic-prophylaxis-with-vancomycin-plus-a-beta-lactam-versus-either-drug-alone-a-national-propensity-score-adjusted-retrospective-cohort-study
#7
MULTICENTER STUDY
Westyn Branch-Elliman, John E Ripollone, William J O'Brien, Kamal M F Itani, Marin L Schweizer, Eli Perencevich, Judith Strymish, Kalpana Gupta
BACKGROUND: The optimal regimen for perioperative antimicrobial prophylaxis is controversial. Use of combination prophylaxis with a beta-lactam plus vancomycin is increasing; however, the relative risks and benefits associated with this strategy are unknown. Thus, we sought to compare postoperative outcomes following administration of 2 antimicrobials versus a single agent for the prevention of surgical site infections (SSIs). Potential harms associated with combination regimens, including acute kidney injury (AKI) and Clostridium difficile infection (CDI), were also considered...
July 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28681315/management-of-lyme-disease-in-european-children-a-review-for-practical-purpose
#8
REVIEW
Matteo D'Alessandro, Anna Loy, Elio Castagnola
PURPOSE OF REVIEW: Lyme disease is a tick-borne zoonosis transmitted through a bite of a tick carrying a spirochete belonging to Borrelia species. In the last 20 years, the reported incidence of Lyme disease is increased by three times in Europe. Clinically, the illness develops through a primary stage with a typical skin rash (erythema marginatum), then a secondary stage with possible neurologic or cardiac involvement. The last stage (chronic Lyme disease) is mainly represented by arthritis or late neurological complications but nowadays is rarely seen due to precocious antibiotic use...
July 5, 2017: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/28674559/-resistant-phenotypes-of-escherichia-coli-strains-responsible-for-urinary-tract-infection-in-the-laboratory-of-the-university-hospital-joseph-raseta-befelatanana-antananarivo
#9
Zafindrasoa Domoina Rakotovao-Ravahatra, Fidiniaina Mamy Randriatsarafara, Saïda Rasoanandrasana, Léa Raverohanta, Andriamiadana Luc Rakotovao
INTRODUCTION: Urinary tract infection caused by Escherichia coli frequently occurs in the hospital environment. This study aims to describe resistant phenotypes of Escherichia coli strains to monitor their occurrence. METHODS: We conducted a descriptive retrospective study of 102 Escherchia coli strains responsible for urinary tract infection in the laboratory of the University Hospital Joseph Raseta Befelatanana, Antananarivo from January 2014 to October 2016. RESULTS: Beta-lactam antibiotic resistance screening identified high-level penicillinases 50% (n=51), Escherichia coli producing extended-spectrum beta-lactamases (ESBLs) 22...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28671522/molecular-epidemiology-of-beta-lactamase-producing-nosocomial-gram-negative-pathogens-from-north-and-south-indian-hospitals
#10
Surbhi Khurana, Purva Mathur, Arti Kapil, Chithra Valsan, Bijayini Behera
PURPOSE: Resistant Gram-negative bacterial (GNB) infections, apart from tremendously escalating the cost of treatment, are a cause for substantial morbidity and mortality among hospitalized patients. Such bacteria are rapidly acquiring resistance to many antimicrobial agents, especially the beta-lactams which are the most frequently prescribed antimicrobials in hospital and community patient care settings, and now also to colistin; a last-line drug to treat infections with such bacteria...
July 3, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28664350/emergence-of-antimicrobial-resistance-to-pseudomonas-aeruginosa-in-the-intensive-care-unit-association-with-the-duration-of-antibiotic-exposure-and-mode-of-administration
#11
Erlangga Yusuf, Bruno Van Herendael, Walter Verbrugghe, Margareta Ieven, Emiel Goovaerts, Kristof Bergs, Kristien Wouters, Philippe G Jorens, Herman Goossens
BACKGROUND: Antibiotics are frequently used in intensive care units (ICUs), and their use is associated with the emergence of bacterial resistance to antibiotics. The aim of this study was to investigate the association between the emergence of Pseudomonas aeruginosa resistance and the duration of antibiotic exposure or mode of administration in an ICU unit. METHODS: A 4-year cohort study of intensive care unit was performed in patients with P. aeruginosa isolates from clinical specimens, initially susceptible to the investigated antibiotics (piperacillin/tazobactam, ceftazidime, ciprofloxacin, meropenem and amikacin)...
December 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28657373/extended-infusion-of-beta-lactam-antibiotics-optimizing-therapy-in-critically-ill-patients-in-the-era-of-antimicrobial-resistance
#12
Nesrine A Rizk, Zeina A Kanafani, Hussam Z Tabaja, Souha S Kanj
Beta-lactams are at the cornerstone of therapy in critical care settings, but their clinical efficacy is challenged by the rise in bacterial resistance. Infections with multi-drug resistant organisms are frequent in intensive care units, posing significant therapeutic challenges. The problem is compounded by a dearth in the development of new antibiotics. In addition, critically-ill patients have unique physiologic characteristics that alter the drugs pharmacokinetics and pharmacodynamics. Areas covered: The prolonged infusion of antibiotics (extended infusion [EI] and continuous infusion [CI]) has been the focus of research in the last decade...
July 3, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/28655352/evaluation-of-early-antimicrobial-therapy-adaptation-guided-by-the-betalacta%C3%A2-test-a-case-control-study
#13
Marc Garnier, Sacha Rozencwajg, Tài Pham, Sophie Vimont, Clarisse Blayau, Mehdi Hafiani, Jean-Pierre Fulgencio, Francis Bonnet, Jean-Luc Mainardi, Guillaume Arlet, Muriel Fartoukh, Salah Gallah, Christophe Quesnel
BACKGROUND: Rapid diagnostic tests detecting microbial resistance are needed for limiting the duration of inappropriateness of empirical antimicrobial therapy (EAT) in intensive care unit patients, besides reducing the use of broad-spectrum antibiotics. We hypothesized that the betaLACTA® test (BLT) could lead to early increase in the adequacy of antimicrobial therapy. METHODS: This was a case-control study. Sixty-one patients with BLT-guided adaptation of EAT were prospectively included, and then matched with 61 "controls" having similar infection characteristics (community or hospital-acquired, and source of infection), in whom EAT was conventionally adapted to antibiogram results...
June 28, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28652240/the-non-antibiotic-macrolide-em703-improves-survival-in-a-model-of-quinolone-treated-pseudomonas-aeruginosa-airway-infection
#14
Gopinath Kasetty, Ravi K V Bhongir, Praveen Papareddy, Heiko Herwald, Arne Egesten
Macrolide antibiotics are used as anti-inflammatory agents, e.g. for prevention of exacerbations in COPD and cystic fibrosis. Several studies have shown improved outcomes after addition of macrolides to beta-lactam antibiotics when treating severe community-acquired pneumonia. However, a beneficial effect of macrolides when treating Gram-negative bacterial airway infections, e.g. those caused by Pseudomonas aeruginosa, remains to be shown. Macrolide antibiotics have significant side effects, in particular motility-stimulating activity of the gastrointestinal tract and promotion of bacterial resistance...
June 26, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28650275/first-description-of-blandm-7-carried-on-an-incx4-plasmid-in-escherichia-coli-st679-isolated-in-spain
#15
Paula Espinal, Elisenda Miró, Concepción Segura, Laura Gómez, Virginia Plasencia, Pere Coll, Ferran Navarro
This study describes the molecular characterization of an NDM-7 carbapenemase-producing Escherichia coli strain Ec188, recovered from a rectal swab of a male patient who had travelled to Pakistan before his hospitalization at the Hospital del Mar in Barcelona, Spain. The Ec188 isolate, assigned to a new multilocus sequence type ST679, was resistant to all beta-lactams, aminoglycosides (gentamicin, tobramycin, and with reduced susceptibility to amikacin), and ciprofloxacin. The blaNDM-7 gene was located on a 50 kb IncX4 plasmid (pEc188-NDM7), both in the original and transconjugant strains...
June 26, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28638846/the-pandemic-h30-subclone-of-sequence-type-131-st131-as-the-leading-cause-of-multidrug-resistant-escherichia-coli-infections-in-the-united-states-2011-2012
#16
James R Johnson, Stephen Porter, Paul Thuras, Mariana Castanheira
BACKGROUND: Extraintestinal Escherichia coli infections are increasingly challenging due to emerging antimicrobial resistance, including resistance to extended-spectrum beta-lactams and fluoroquinolones. Sequence type 131 (ST131) is a leading contributor. METHODS: Three hundred sixty E. coli clinical isolates from across the United States (2011-2012), selected randomly from the SENTRY collection within 3 resistance categories (extended-spectrum cephalosporin [ECS]-reduced susceptibility [RS]; fluoroquinolone-resistant, ESC-susceptible; and fluoroquinolone-susceptible, ESC-susceptible) were typed for phylogroup, sequence type complex (STc), subsets thereof, virulence genotype, O type, and beta-lactamase genes...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28634829/potential-inhibitory-effect-of-indolizine-derivatives-on-the-two-enzymes-nicotinamide-phosphoribosyltransferase-and-beta-lactamase-a-molecular-dynamics-study
#17
Beata Szefler, Przemysław Czeleń
Nicotinamide phosphoribosyl-transferases (NAMPT) are enzymes that play a role in targeting cancer metabolism, while beta lactamases are involved in bacterial resistance to beta-lactam antibiotics. Many protein inhibitors exhibit such property which is often correlated with their cellular potency. In order to understand such a phenomenon, the present article conducts an analysis of the dynamic behavior of complexes formed by the inhibitors, that is indolizine derivatives, with the studied enzymes. Both docking and molecular dynamics led to identification of their interactions and showed the mechanism of inhibition of the two studied enzymes...
July 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28632991/uncovering-the-repertoire-of-fungal-secondary-metabolites-from-fleming-s-laboratory-to-the-international-space-station
#18
Tomasz Boruta
Fungi produce a variety of secondary metabolites (SMs), low-molecular weight compounds associated with many potentially useful biologic activities. The examples of biotechnologically relevant fungal metabolites include penicillin, a β-lactam antibiotic, and lovastatin, a cholesterol-lowering drug. The discovery of pharmaceutical lead compounds within the microbial metabolic pools relies on the selection and biochemical characterization of promising strains. Not all SMs are produced under standard cultivation conditions, hence the uncovering of chemical potential of investigated strains often requires the use of induction strategies to awake the associated biosynthetic genes...
June 20, 2017: Bioengineered
https://www.readbyqxmd.com/read/28630187/cumulative-effect-of-an-antimicrobial-stewardship-and-rapid-diagnostic-testing-bundle-on-early-streamlining-of-antimicrobial-therapy-in-gram-negative-bloodstream-infections
#19
P B Bookstaver, E B Nimmich, T J Smith, J A Justo, J Kohn, K L Hammer, C Troficanto, H A Albrecht, M N Al-Hasan
OBJECTIVES: The use of rapid diagnostic tests (RDT) enhances antimicrobial stewardship programs (ASP) interventions in optimization of antimicrobial therapy. This quasi-experimental cohort study evaluates the combined impact of an ASP/RDT bundle on appropriateness of empirical antimicrobial therapy (EAT) and time to de-escalation of broad-spectrum agents (BSAA) in gram-negative bloodstream infections (GNBSI). METHODS: ASP/RDT bundle consisted of a system-wide GNBSI treatment guidelines, prospective stewardship monitoring, and sequential introduction of two RDTs, Matrix Assisted Laser Desorption Ionization Time-of-Flight (MALDI-TOF) and FilmArray® Blood Culture Identification (BCID) panel...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28625995/novel-antibiotic-resistance-determinants-from-agricultural-soil-exposed-to-antibiotics-widely-used-in-human-medicine-and-animal-farming
#20
Calvin Ho-Fung Lau, Kalene van Engelen, Stephen Gordon, Justin Renaud, Edward Topp
Antibiotic resistance has emerged globally as one of the biggest threats to human and animal health. Although the excessive use of antibiotics is recognized for accelerating the selection for resistance, there is a growing body of evidence suggesting that natural environments are "hotspots" for the development of both ancient and contemporary resistance mechanisms. Given that pharmaceuticals can be entrained onto agricultural land through anthropogenic activities, this could be a potential driver for the emergence and dissemination of resistance in soil bacteria...
June 16, 2017: Applied and Environmental Microbiology
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