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https://www.readbyqxmd.com/read/28196509/point-of-care-testing-for-emergency-assessment-of-coagulation-in-patients-treated-with-direct-oral-anticoagulants
#1
Matthias Ebner, Ingvild Birschmann, Andreas Peter, Charlotte Spencer, Florian Härtig, Joachim Kuhn, Gunnar Blumenstock, Christine S Zuern, Ulf Ziemann, Sven Poli
BACKGROUND: Point-of-care testing (POCT) of coagulation has been proven to be of great value in accelerating emergency treatment. Specific POCT for direct oral anticoagulants (DOAC) is not available, but the effects of DOAC on established POCT have been described. We aimed to determine the diagnostic accuracy of Hemochron® Signature coagulation POCT to qualitatively rule out relevant concentrations of apixaban, rivaroxaban, and dabigatran in real-life patients. METHODS: We enrolled 68 patients receiving apixaban, rivaroxaban, or dabigatran and obtained blood samples at six pre-specified time points...
February 15, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28159824/novel-thrombolytic-drug-based-on-thrombin-cleavable-microplasminogen-coupled-to-a-single-chain-antibody-specific-for-activated-gpiib-iiia
#2
Thomas Bonnard, Zachary Tennant, Be'Eri Niego, Ruchi Kanojia, Karen Alt, Shweta Jagdale, Lok Soon Law, Sheena Rigby, Robert Lindsay Medcalf, Karlheinz Peter, Christoph Eugen Hagemeyer
BACKGROUND: Thrombolytic therapy for acute thrombosis is limited by life-threatening side effects such as major bleeding and neurotoxicity. New treatment options with enhanced fibrinolytic potential are therefore required. Here, we report the development of a new thrombolytic molecule that exploits key features of thrombosis. We designed a recombinant microplasminogen modified to be activated by the prothrombotic serine-protease thrombin (HtPlg), fused to an activation-specific anti-glycoprotein IIb/IIIa single-chain antibody (SCE5), thereby hijacking the coagulation system to initiate thrombolysis...
February 3, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28134790/efficient-synthesis-of-novel-pyridine-based-derivatives-via-suzuki-cross-coupling-reaction-of-commercially-available-5-bromo-2-methylpyridin-3-amine-quantum-mechanical-investigations-and-biological-activities
#3
Gulraiz Ahmad, Nasir Rasool, Hafiz Mansoor Ikram, Samreen Gul Khan, Tariq Mahmood, Khurshid Ayub, Muhammad Zubair, Eman Al-Zahrani, Usman Ali Rana, Muhammad Nadeem Akhtar, Noorjahan Banu Alitheen
The present study describes palladium-catalyzed one pot Suzuki cross-coupling reaction to synthesize a series of novel pyridine derivatives 2a-2i, 4a-4i. In brief, Suzuki cross-coupling reaction of 5-bromo-2-methylpyridin-3-amine (1) directly or via N-[5-bromo-2-methylpyridine-3-yl]acetamide (3) with several arylboronic acids produced these novel pyridine derivatives in moderate to good yield. Density functional theory (DFT) studies were carried out for the pyridine derivatives 2a-2i and 4a-4i by using B3LYP/6-31G(d,p) basis with the help of GAUSSIAN 09 suite programme...
January 27, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28129263/tissue-injury-suppresses-fibrinolysis-following-hemorrhagic-shock-in-non-human-primates-rhesus-macaque
#4
Antoni R Macko, Hunter Moore, Andrew P Cap, M Adam Meledeo, Ernest E Moore, Forest R Sheppard
BACKGROUND: Hypoperfusion is associated with hyperfibrinolysis and early death from exsanguination, while tissue trauma is associated with hypofibrinolysis and delayed death from organ failure. We sought to elucidate the effects of injury patterns on fibrinolysis phenotypes using a non-human primate (NHP) model. METHODS: NHPs were randomized to three injury groups (n=8/group): 60 min severe pressure-targeted controlled hemorrhagic shock (HS); HS + soft tissue injury (HS+); or HS + soft tissue injury + femur fracture (HS++)...
January 26, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28119314/most-surgical-patients-do-not-need-anti-clotting-drugs-analysis-finds
#5
Jacqui Wise
No abstract text is available yet for this article.
January 23, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28113560/biomedical-and-catalytic-applications-of-gold-and-silver-gold-alloy-nanoparticles-biosynthesized-using-cell-free-extract-of-bacillus-safensis-lau-13-antifungal-dye-degradation-anti-coagulant-and-thrombolytic-activities
#6
Sunday A Ojo, Agbaje Lateef, Musibau A Azeez, Suliat M Oladejo, Abiola S Akinwale, Tesleem B Asafa, Taofeek A Yekeen, Akeem Akinboro, Iyabo C Oladipupo, Evariste B Gueguim-Kana, Lorika S Beukes
This study investigated the green biosynthesis of gold (Au) and silver-gold alloy (Ag-Au) nanoparticles using cell-free extract of Bacillus safensis LAU 13 strain (GenBank accession No: KJ461434). The biosynthesized AuNPs and Ag-AuNPs were characterized using UV-Vis spectroscopy, Fourier-transform infrared spectroscopy, and Transmission electron microscopy. Evaluation of the antifungal activities, degradation of malachite green, anti-coagulation of blood and thrombolysis of human blood clot by the biosynthesized nanoparticles were investigated...
April 29, 2016: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28110073/sphingosine-1-phosphate-improves-endothelialization-with-reduction-of-thrombosis-in-recellularized-human-umbilical-vein-graft-by-inhibiting-syndecan-1-shedding-in-vitro
#7
Kai Hsia, Ming-Jie Yang, Wei-Min Chen, Chao-Ling Yao, Chih-Hsun Lin, Che-Chuan Loong, Yi-Long Huang, Ya-Ting Lin, Arthur D Lander, Hsinyu Lee, Jen-Her Lu
: Sphingosine-1-phosphate (S1P) has been known to promote endothelial cell (EC) proliferation and protect Syndecan-1 (SDC1) from shedding, thereby maintaining this antithrombotic signal. In the present study, we investigated the effect of S1P in the construction of a functional tissue-engineered blood vessel by using human endothelial cells and decellularized human umbilical vein (DHUV) scaffolds. Both human umbilical vein endothelial cells (HUVEC) and human cord blood derived endothelial progenitor cells (EPC) were seeded onto the scaffold with or without the S1P treatment...
January 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28107663/antibacterial-anti-oxidant-electroactive-injectable-hydrogel-as-self-healing-wound-dressing-with-hemostasis-and-adhesiveness-for-cutaneous-wound-healing
#8
Xin Zhao, Hao Wu, Baolin Guo, Ruonan Dong, Yusheng Qiu, Peter X Ma
Injectable self-healing hydrogel dressing with multifunctional properties including anti-infection, anti-oxidative and conductivity promoting wound healing process will be highly desired in wound healing application and its design is still a challenge. We developed a series of injectable conductive self-healed hydrogels based on quaternized chitosan-g-polyaniline (QCSP) and benzaldehyde group functionalized poly(ethylene glycol)-co-poly(glycerol sebacate) (PEGS-FA) as antibacterial, anti-oxidant and electroactive dressing for cutaneous wound healing...
January 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/28107496/studies-on-new-activities-of-enantiomers-of-2-2-hydroxypropanamido-benzoic-acid-antiplatelet-aggregation-and-antithrombosis
#9
Qili Zhang, Danlin Wang, Meiyan Zhang, Yunli Zhao, Zhiguo Yu
R-/S-2-(2-Hydroxypropanamido) benzoic acid (R-/S-HPABA), a marine-derived anti-inflammatory drug, however, the antiplatelet and antithrombotic effects have not been investigated. In this paper, the in vitro antiplatelet activities and in vivo antithrombotic effects of R-/S-HPABA were investigated, for the first time. The effects of R-/S-HPABA on platelet aggregation induced by adenosine diphosphate (ADP), collagen (COLL) and arachidonic acid (AA) were evaluated. In addition, the in vivo bleeding time, clotting time, collagen-epinephrine induced pulmonary thrombosis and common carotid artery thrombosis were also investigated in rats...
2017: PloS One
https://www.readbyqxmd.com/read/28102731/microfluidic-whole-blood-testing-of-platelet-response-to-pharmacological-agents
#10
Ruizhi Li, Tilo Grosser, Scott L Diamond
Platelets present a number of intracellular and transmembrane targets subject to pharmacological modulation, either for cardiovascular disease reduction or as an unintended drug response. Microfluidic devices allow human blood to clot on a defined surface under controlled hemodynamic and pharmacological conditions. The potencies of a number of antiplatelet and anticancer drugs have been tested with respect to platelet deposition on collagen under flow. Inhibitors of cyclooxygenase-1 (COX-1) reduce platelet deposition, either when added ex vivo to blood or ingested orally by patients prior to testing...
January 19, 2017: Platelets
https://www.readbyqxmd.com/read/28074788/comparison-of-two-doses-of-heparin-on-outcome-in-off-pump-coronary-artery-bypass-surgery-patients-a-prospective-randomized-control-study
#11
Murali Chakravarthy, Dattatreya Prabhakumar, Patil Thimmannagowda, Jayaprakash Krishnamoorthy, Antony George, Vivek Jawali
INTRODUCTION: While off pump coronary artery bypass surgery is practiced with an intention to reduce the morbidity associated with cardiopulmonary bypass, the resultant 'hypercoagulability' needs to be addressed. Complications such as cavitary thrombus possibly due to the hyper coagulability after off pump coronary artery bypass surgery have been described. Many clinicians use higher doses of heparin - up to 5 mg/kg in order to thwart this fear. Overall, there appears to be no consensus on the dose of heparin in off pump coronary artery bypass surgeries...
January 2017: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/28073784/platelets-and-neutrophil-extracellular-traps-collaborate-to-promote-intravascular-coagulation-during-sepsis-in-mice
#12
Braedon McDonald, Rachelle P Davis, Seok-Joo Kim, Mandy Tse, Charles T Esmon, Elzbieta Kolaczkowska, Craig N Jenne
Neutrophil extracellular traps (NETs; webs of DNA coated in anti-microbial proteins) are released into the vasculature during sepsis where they contribute to host defense, but also cause tissue damage and organ dysfunction. Various components of NETs have also been implicated as activators of coagulation. Using multi-color confocal intravital microscopy in mouse models of sepsis, we observed profound platelet aggregation, thrombin activation, and fibrin clot formation within (and downstream of) NETs in vivo...
January 10, 2017: Blood
https://www.readbyqxmd.com/read/28053193/promyelocytic-extracellular-chromatin-exacerbates-coagulation-and-fibrinolysis-in-acute-promyelocytic-leukemia
#13
Muhua Cao, Tao Li, Zhangxiu He, Lixiu Wang, Xiaoyan Yang, Yan Kou, Lili Zou, Xue Dong, Valerie A Novakovic, Yayan Bi, Junjie Kou, Bo Yu, Shaohong Fang, Jinghua Wang, Jin Zhou, Jialan Shi
Despite routine treatment of unselected acute promyelocytic leukemia (APL) with all-trans-retinoic acid (ATRA), early death due to hemorrhage remains unacceptably common and the mechanism underlying this complication remains elusive. We have recently demonstrated that APL cells undergo a novel cell death program, termed ETosis, which involves release of extracellular chromatin. However, the role of promyelocytic extracellular chromatin in APL-associated coagulation remains unclear. Our objectives were to identify the novel role of ATRA-promoted extracellular chromatin in inducing a hypercoagulable and hyperfibrinolytic state in APL and to evaluate its interaction with fibrin and endothelial cells (ECs)...
January 4, 2017: Blood
https://www.readbyqxmd.com/read/28052306/laboratory-monitoring-of-parenteral-direct-thrombin-inhibitors
#14
Elizabeth M Van Cott, A Joshua Roberts, William E Dager
Argatroban and bivalirudin are parenteral direct inhibitors of the activity of thrombin, but, unlike heparin, can inhibit both soluble as well as clot-bound thrombin. These agents do not require antithrombin as a cofactor for activity. The parenteral direct thrombin inhibitors (DTIs) can be used in a variety of settings, including heparin-induced thrombocytopenia (HIT) or an allergy to heparin, and patients requiring anticoagulation for an invasive cardiovascular intervention. Both agents have a relatively short half-life in patients without organ system failure and are typically administered by continuous infusion...
January 4, 2017: Seminars in Thrombosis and Hemostasis
https://www.readbyqxmd.com/read/28007922/synergistic-interaction-between-phage-therapy-and-antibiotics-clears-pseudomonas-aeruginosa-infection-in-endocarditis-and-reduces-virulence
#15
Frank Oechslin, Philippe Piccardi, Stefano Mancini, Jérôme Gabard, Philippe Moreillon, José M Entenza, Gregory Resch, Yok-Ai Que
BACKGROUND: Increasing antibiotic resistance warrants therapeutic alternatives. Here we investigated the efficacy of bacteriophage-therapy (phage) alone or combined with antibiotics against experimental endocarditis (EE) due to Pseudomonas aeruginosa, an archetype of difficult-to-treat infection. METHODS: In vitro fibrin-clots and rats with aortic EE were treated with an anti-pseudomonas phage cocktail alone or combined with ciprofloxacin. Phage pharmacology, therapeutic efficacy, and resistance were determined...
December 22, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27993886/acquired-dysfibrinogenemia-caused-by-autoantibody-inhibiting-fibrin-polymerization-in-a-patient-with-melas-syndrome-and-bleeding-tendency
#16
Nuri Lee, Ji-Eun Kim, Hyun Ju Yoo, JaYoon Gu, Hyori Kim, Junho Chung, Youngil Koh, Hyun Kyung Kim
We present a case of acquired dysfibrinogenemia caused by an autoantibody that inhibited fibrin polymerization in a patient previously diagnosed with MELAS (mitochondrial myopathy, encephalopathy, lactic acidosis, stroke-like episodes). The patient showed prolonged PT, aPTT, and thrombin time. There was no factor deficiency but fibrinogen antigen and activity were decreased. ELISA for detection of fibrinogen antibodies were performed and IgG purified from the patient's plasma bound to fibrinogen more strongly than did control IgG, indicating the presence of a fibrinogen-specific antibody...
December 2016: Annals of Clinical and Laboratory Science
https://www.readbyqxmd.com/read/27988438/detection-of-lupus-anticoagulant-in-the-era-of-direct-oral-anticoagulants
#17
REVIEW
Ariela Hoxha, Alessandra Banzato, Amelia Ruffatti, Vittorio Pengo
Lupus anticoagulant (LAC) is an in vitro phenomenon determining a phospholipid-dependent elongation of clotting times. The presence of LAC associated with anticardiolipin (aCL) and anti-β2 glycoprotein I (anti-β2GPI) antibodies is strongly associated with thrombosis and pregnancy morbidity. Direct oral anticoagulants (DOACs) targeting thrombin and factor Xa are currently widely use to prevent and treat venous and arterial thromboembolism. Some concern has, however, been expressed about the possibility of false laboratory results during LAC assessment in patients taking these drugs...
February 2017: Autoimmunity Reviews
https://www.readbyqxmd.com/read/27986971/management-of-bleeding-in-patients-receiving-non-vitamin-k-antagonists
#18
REVIEW
Sudarshan Balla, Scott Koerber, Greg Flaker
Anticoagulation with non-vitamin K antagonists (Non vitamin K oral anticoagulant (NOACs)) including dabigatran, rivaroxaban, apixaban and edoxaban is at least as effective as warfarin, has fewer drug and food interactions and does not require monthly monitoring. Although major bleeding with NOACs is infrequent, there remains concern about the ability to effectively treat episodes of major bleeding. New agents have been developed that are capable of providing rapid reversal of the anticoagulation effect of NOACs...
December 16, 2016: Postgraduate Medical Journal
https://www.readbyqxmd.com/read/27983747/laboratory-and-clinical-monitoring-of-direct-acting-oral-anticoagulants-what-clinicians-need-to-know
#19
Susan E Conway, Andrew Y Hwang, Charles D Ponte, John G Gums
The direct acting oral anticoagulants (DOACs), including dabigatran, rivaroxaban, apixaban, and edoxaban, have favorable pharmacokinetic and pharmacodynamic properties and equal or superior efficacy and an improved safety profile compared with warfarin. Noted shortcomings with DOACs are shorter half-lives requiring stricter adherence, lack of standardized laboratory monitoring, lack of anticoagulation reversal agents, and loss of routine coagulation monitoring leading to fewer patient-clinician interactions...
December 16, 2016: Pharmacotherapy
https://www.readbyqxmd.com/read/27976897/potent-selective-allosteric-inhibition-of-human-plasmin-by-sulfated-non-saccharide-glycosaminoglycan-mimetics
#20
Daniel K Afosah, Rami A Al-Horani, Nehru Viji Sankaranarayanan, Umesh R Desai
Although plasmin inhibitors could be used in multiple disorders, their use has been restricted to preventing blood loss in hemostatic dysregulation because of poor efficacy and adverse effects of current agents. We reasoned that a new class of direct inhibitors that offer better efficacy, selectivity, and safety could be discovered by exploiting allosterism in plasmin, a protease homologous to other allosteric serine proteases. We report on the synthesis, biological activity, and mechanism of action of a group of small molecules, called non-saccharide glycosaminoglycan mimetics (NSGMs), as direct allosteric plasmin inhibitors...
January 5, 2017: Journal of Medicinal Chemistry
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