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ANTIPLATELET AGENTS

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https://www.readbyqxmd.com/read/28531882/%C3%AE-thromboglobulin-and-incident-cardiovascular-disease-risk-the-atherosclerosis-risk-in-communities-study
#1
Yasuhiko Kubota, Alvaro Alonso, Aaron R Folsom
INTRODUCTION: Although it has been suggested that increased concentrations of activated platelet biomarkers are associated with increased risk of incident cardiovascular disease (CVD) in the general population, evidence for this association is still controversial. Thus, we tested the hypothesis that activated platelets, measured by higher concentrations of β-thromboglobulin, are associated with increased risk of incident CVD (coronary heart disease, heart failure ischemic stroke, and atrial fibrillation)...
May 17, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28528236/-management-of-the-bleeding-risk-associated-with-antiplatelet-agents
#2
A-C Martin, S Houssany-Pissot, D Zlotnik, G Taylor, A Godier
Like all antithrombotic drugs, antiplatelet agents expose to a risk of bleeding complications. Clinical research has extensively focused on the efficacy of these drugs to reduce ischemic events. The bleeding risk associated with them was solely considered as an inevitable and acceptable complication. When two new potent P2Y12-receptor inhibitors, prasugrel and ticagrelor, were marketed, the risk of major bleeding increased. These new agents have modified the balance between the absolute risk reduction in ischemic events and the absolute risk increase in bleeding events...
May 17, 2017: La Revue de Médecine Interne
https://www.readbyqxmd.com/read/28526159/anticoagulation-and-neuraxial-peripheral-anesthesia
#3
REVIEW
Mudit Kaushal, Ryan E Rubin, Alan D Kaye, Karina Gritsenko
Novel anticoagulants (NAGs) have emerged as the preferred alternatives to vitamin K antagonists. In patients being considered for regional anesthesia, these drugs present a layer of complexity in the preprocedure evaluation. There are no established tests to monitor anticoagulant activity and our experience is short with these drugs. These authors believe it is important to review the relevant hematology, orthopedics, and anesthesiology literature to provide a valuable reference for the clinician who is met with these challenges...
June 2017: Anesthesiology Clinics
https://www.readbyqxmd.com/read/28526024/protective-effect-on-the-coronary-microcirculation-of-patients-with-diabetes-by-clopidogrel-or-ticagrelor-predict-study-rationale-and-design-a-randomized-multicenter-clinical-trial-using-intracoronary-multimodal-physiology
#4
Enrico Cerrato, Alicia Quirós, Mauro Echavarría-Pinto, Hernan Mejia-Renteria, Andres Aldazabal, Nicola Ryan, Nieves Gonzalo, Pilar Jimenez-Quevedo, Luis Nombela-Franco, Pablo Salinas, Iván J Núñez-Gil, José Ramón Rumoroso, Antonio Fernández-Ortiz, Carlos Macaya, Javier Escaned
BACKGROUND: In diabetic patients a predisposed coronary microcirculation along with a higher risk of distal particulate embolization during primary percutaneous intervention (PCI) increases the risk of peri-procedural microcirculatory damage. However, new antiplatelet agents, in particular Ticagrelor, may protect the microcirculation through its adenosine-mediated vasodilatory effects. METHODS: PREDICT is an original, prospective, randomized, multicenter controlled study designed to investigate the protective effect of Ticagrelor on the microcirculation during PCI in patient with diabetes mellitus type 2 or pre-diabetic status...
May 19, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28510131/generation-of-radical-form-of-dipyridamole-at-illumination-of-photosynthetic-reaction-centers-of-rb-sphaeroides
#5
P P Knox, K N Timofeev, V V Gorokhov, N Kh Seifullina, A B Rubin
The study of the effect of vasodilator, antiplatelet agent, and inhibitor P-glycoprotein dipyridamole (DIP) on the functioning of the transmembrane protein of the reaction center (RC) of Rb. sphaeroides showed that the activation of RC by constant light generates the DIP radical cation, which significantly affects the kinetics of recombination of charges divided between photoactive bacteriochlorophyll and quinone acceptors. Thus, the antioxidant properties of DIP may affect the functional activity of membrane proteins, and this apparently should be taken into account in the studies of the mechanisms of therapeutic action of this drug...
March 2017: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28504994/preoperative-low-dose-aspirin-exposure-and-outcomes-after-emergency-neurosurgery-for-traumatic-intracranial-hemorrhage-in-elderly-patients
#6
Alex T Lee, Arni Gagnidze, Sharon R Pan, Pimwan Sookplung, Bala Nair, Shu-Fang Newman, Alon Ben-Ari, Ahmed Zaky, Kevin Cain, Monica S Vavilala, Irene Rozet
BACKGROUND: Antiplatelet medications are usually discontinued before elective neurosurgery, but this is not an option for emergent neurosurgery. We performed a retrospective cohort study to examine whether preoperative aspirin use was associated with worse outcomes after emergency neurosurgery in elderly patients. METHODS: We analyzed all cases of emergency neurosurgical procedures for traumatic intracranial hemorrhage from 2008 to 2012 at a level 1 trauma center...
May 11, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28504052/adenosine-a2a-receptor-agonists-with-potent-antiplatelet-activity
#7
Eduardo Fuentes, Manuel Fuentes, Julio Caballero, Iván Palomo, Sonja Hinz, Ali El-Tayeb, Christa E Müller
Selected adenosine A2A receptor agonists (PSB-15826, PSB-12404, and PSB-16301) have been evaluated as new antiplatelet agents. In addition, radioligand-binding studies and receptor-docking experiments were performed in order to explain their differential biological effects on a molecular level. Among the tested adenosine derivatives, PSB-15826 was the most potent compound to inhibit platelet aggregation (EC50 0.32 ± 0.05 µmol/L) and platelet P-selectin cell-surface localization (EC50 0.062 ± 0.2 µmol/L), and to increase intraplatelets cAMP levels (EC50 0...
May 15, 2017: Platelets
https://www.readbyqxmd.com/read/28494138/rational-design-and-synthesis-of-1-arylideneamino-4-aryl-1h-imidazole-2-amine-derivatives-as-antiplatelet-agents
#8
Salimeh Amidi, Marjan Esfahanizadeh, Kimia Tabib, Zohreh Soleimani, Farzad Kobarfard
Based on the previous studies indicating the pharmacophoric role of hydrazone group and azole rings for antiplatelet aggregation activity, a few series of compounds with both hydrazone and azole (imidazole) ring in their structures were synthesized and their platelet aggregation inhibitory effect was evaluated. Two compounds among the 1-(arylideneamino)-4-aryl-1H-imidazole-2-amine derivatives compound 4a and 4p showed IC50 values comparable to that of aspirin against collagen as platelet aggregation inducer...
May 11, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28489475/antithrombotic-strategies-for-preventing-long-term-major-adverse-cardiovascular-events-in-patients-with-non-valvular-atrial-fibrillation-who-undergo-percutaneous-coronary-intervention
#9
Manan Pareek, Deepak L Bhatt, Jürrien M Ten Berg, Steen D Kristensen, Erik L Grove
Balancing the risk of recurrent ischemia and bleeding among patients with non-valvular atrial fibrillation who undergo percutaneous coronary intervention (PCI) is challenging. Postprocedural antithrombotic therapy aims to reduce the risk related to coronary artery disease, stent placement, and atrial fibrillation, with acceptable risks of bleeding. Areas Covered: This brief review summarizes evidence and recommendations related to long-term antithrombotic strategies in such patients. An overview of the findings from recent meta-analyses and select observational studies is provided, and important completed and ongoing randomized trials are described in detail...
May 10, 2017: Expert Opinion on Pharmacotherapy
https://www.readbyqxmd.com/read/28488110/platelets-as-crucial-partners-for-tumor-metastasis-from-mechanistic-aspects-to-pharmacological-targeting
#10
REVIEW
Annalisa Contursi, Angela Sacco, Rosalia Grande, Melania Dovizio, Paola Patrignani
Platelets are anucleated cells that circulate in the blood as sentinels of tissue integrity. In fact, they are rich in a plethora of proteins and other factors stored in different granules which they selectively release upon stimulation. Moreover, platelets synthesize a vast number of lipids and release various types of vesicles, including exosomes which are rich in genetic material. Platelets possess a central function to interact with other cell types, including inflammatory cells and cancer cells. Recent findings have enlightened the capacity of platelets to induce changes in the phenotype of cancer cells which acquire invasiveness thus enhancing their metastatic potential...
May 9, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28487393/potent-thrombolytic-effect-of-n-acetylcysteine-on-arterial-thrombi
#11
Sara Martinez de Lizarrondo, Clément Gakuba, Bradley A Herbig, Yohann Repessé, Carine Ali, Cécile V Denis, Peter Lenting, Emmanuel Touzé, Scott L Diamond, Denis Vivien, Maxime Gauberti
Background -Platelet crosslinking during arterial thrombosis involves von Willebrand Factor (VWF) multimers. Therefore, proteolysis of VWF appears promising to disaggregate platelet-rich thrombi and restore vessel patency in acute thrombotic disorders such as ischemic stroke, acute coronary syndrome or acute limb ischemia. N-Acetylcysteine (NAC, a clinically approved mucolytic drug) can reduce intrachain disulfide bonds in large polymeric proteins. In the present study, we postulated that NAC might cleave the VWF multimers inside occlusive thrombi, thereby leading to their dissolution and arterial recanalization...
May 9, 2017: Circulation
https://www.readbyqxmd.com/read/28484732/use-of-over-the-scope-clips-otsc-for-hemostasis-in-gastrointestinal-bleeding-in-patients-under-antithrombotic-therapy
#12
Regina Lamberts, Anna Koch, Christian Binner, Marcus Zachäus, Ingrid Knigge, Mark Bernhardt, Ulrich Halm
Background and study aims In patients taking different regimens of antithrombotic and/or anticoagulant therapy, endoscopic management of gastrointestinal bleeding represents a major challenge due to failing endogenous hemostasis. In this retrospective study we report on success rates with the over-the-scope clip (OTSC) system in upper and lower gastrointestinal bleeding in this high-risk patient population. Patients and methods Between February 2011 and June 2014, 75 patients were treated with an OTSC for active gastrointestinal bleeding...
May 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/28483209/the-population-based-long-term-impact-of-anticoagulant-and-antiplatelet-therapies-in-low-risk-patients-with-atrial-fibrillation
#13
Anjani Golive, Heidi T May, Tami L Bair, Victoria Jacobs, Brian G Crandall, Michael J Cutler, John D Day, Charles Mallender, Jeffrey S Osborn, Scott M Stevens, J Peter Weiss, Scott C Woller, T Jared Bunch
Among patients with atrial fibrillation (AF), the risk of stroke risk is a significant concern. CHADS2 and CHA2DS2-VASc ≤2 scoring have been used to stratify patients into categories of risk. Without randomized, prospective data, the need and type of long-term antithrombotic medications for thromboembolism prevention in lower risk AF patients remains controversial. We sought to define the long-term impact of anticoagulant and antiplatelet therapy use in AF patients at low risk of stroke. A total of 56,764 patients diagnosed with AF and a CHADS2 score of 0 or 1, or CHA2DS2-VASc score of 0, 1, or 2 were studied...
April 12, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28481519/fibrin-targeted-and-h2o2-responsive-nanoparticles-as-a-theranostics-for-thrombosed-vessels
#14
Changsun Kang, Sian Gwon, Chulgyu Song, Peter M Kang, Seong-Cheol Park, Jongho Jeon, Do Won Hwang, Dongwon Lee
Thrombus (blood clot) is formed in the injured vessels to maintain the integrity of vasculature. However, obstruction of blood vessels by thrombosis slows blood flow, leading to death of tissues fed by the artery and is the main culprit of various life-threatening cardiovascular diseases. Herein, we report novel nanomedicine which could specifically image obstructed vessels and inhibit thrombus formation. Based on the unique physicochemical and biological characteristics of thrombus such as the abundance of fibrin and the elevated level of hydrogen peroxide (H2O2), we developed fibrin-targeted imaging and antithrombotic nanomedicine, termed FTIAN as a theranostic system for obstructive thrombosis...
May 8, 2017: ACS Nano
https://www.readbyqxmd.com/read/28479454/the-current-status-of-carotid-endarterectomy-part-i-randomized-trials-versus-medical-management
#15
Norman R Hertzer
A vascular surgeon is consulted to evaluate a patient because of carotid stenosis. By the time the surgeon enters the examining room or arrives at the bedside, he (she) is aware of the sex and age of the patient as well as the severity of the stenosis on a recent high-quality imaging study. After asking if the patient has had any related symptoms and how long ago they occurred, the surgeon has all of the information that is necessary to determine, in the absence of serious comorbidities, whether this patient is an appropriate candidate for carotid intervention and even how quickly it should be performed...
May 4, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28476519/the-underutilisation-of-dual-antiplatelet-therapy-in-acute-coronary-syndrome
#16
Malcolm Anastasius, Jerrett K Lau, Karice Hyun, Mario D'Souza, Anushka Patel, Jamie Rankin, Darren Walters, Craig Juergens, Bernadette Aliprandi-Costa, Andrew T Yan, Shaun G Goodman, Derek Chew, David Brieger
BACKGROUND: Despite guideline recommendation of dual antiplatelet therapy (DAPT) in treating ACS, DAPT is underutilized. Our objective was to determine independent predictors of DAPT non-prescription in ACS and describe pattern of DAPT prescription over time. METHODS: Patients presenting to 41 Australian hospitals with an ACS diagnosis between 2009 and 2016 were stratified according to discharge prescription with DAPT and single antiplatelet therapy (SAPT) or no antiplatelet therapy...
April 25, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28475757/a-multicenter-cohort-comparison-study-of-the-safety-efficacy-and-cost-of-ticagrelor-compared-to-clopidogrel-in-aneurysm-flow-diverter-procedures
#17
Justin M Moore, Nimer Adeeb, Hussain Shallwani, Raghav Gupta, Apar S Patel, Christoph J Griessenauer, Roy Youn, Adnan Siddiqui, Christopher S Ogilvy, Ajith J Thomas
BACKGROUND: Thromboembolic and hemorrhagic complications are among the most feared adverse events in the endovascular treatment of aneurysms, and this is particularly the case for flow diverter devices. Dual antiplatelet therapy has become standard of care; however, the safety, efficacy, and cost profiles of newer antiplatelet agents are not well characterized in the neurovascular context. OBJECTIVE: To compare the safety, efficacy, and cost of one of these newer agents, ticagrelor, to the most frequently used agent, clopidogrel...
May 5, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28475282/risk-of-intracranial-hemorrhage-in-ground-level-fall-with-antiplatelet-or-anticoagulant-agents
#18
Michael Ganetsky, Gregory Lopez, Tara Coreanu, Victor Novack, Steven Horng, Nathan I Shapiro, Kenneth A Bauer
OBJECTIVES: Anticoagulant and antiplatelet medications are known to increase the risk and severity of traumatic intracranial hemorrhage (tICH), even with minor head trauma. Most studies on bleeding propensity with head trauma are retrospective, based on trauma registries, or include heterogeneous mechanisms of injury. The goal of this study was to determine the rate of tICH from only a common low-acuity mechanism of injury, that of a ground level fall, in patients taking one or more of the following antiplatelet or anticoagulant medications: aspirin, warfarin, prasugrel, ticagrelor, dabigatran, rivaroxaban, apixaban or enoxaparin...
May 5, 2017: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/28472526/glycoprotein-iib-iiia-inhibitors-in-prevention-and-rescue-treatment-of-thromboembolic-complications-during-endovascular-embolization-of-intracranial-aneurysms
#19
David Dornbos, Joel S Katz, Patrick Youssef, Ciarán J Powers, Shahid M Nimjee
Thromboembolic complications remain a major risk of endovascular neurosurgery during the treatment of intracranial aneurysms, despite the use of therapeutic heparinization and oral antiplatelet therapy when indicated. Glycoprotein (GP) IIb/IIIa inhibitors target a nonredundant pathway of platelet aggregation following adhesion and activation. Initially established and implemented in the cardiovascular arena, this drug class has provided a new tool in the neurovascular armamentarium as well. Numerous case reports, case series, and retrospective reviews have evaluated the safety and efficacy of abciximab, eptifibatide, and tirofiban in the treatment of acute thromboembolic complications during the endovascular treatment of intracranial aneurysms...
May 3, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28463896/a-meta-analysis-of-the-impact-of-aspirin-clopidogrel-and-dual-antiplatelet-therapy-on-bleeding-complications-in-noncardiac-surgery
#20
Jesse A Columbo, Andrew J Lambour, Rebecca A Sundling, Nirali B Chauhan, Sarah Y Bessen, David L Linshaw, Ravinder Kang, Natalie B V Riblet, Philip P Goodney, David H Stone
OBJECTIVE: The aim of this study was to determine the bleeding risks associated with single (aspirin) and dual (aspirin + clopidogrel) antiplatelet therapy (DAPT) versus placebo or no treatment in adults undergoing noncardiac surgery. SUMMARY OF BACKGROUND DATA: The impact of antiplatelet therapy on bleeding during noncardiac surgery remains controversial. A meta-analysis was performed to examine the risk associated with single and DAPT. METHODS: A systematic review of antiplatelet therapy, noncardiac surgery, and perioperative bleeding was performed...
May 1, 2017: Annals of Surgery
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