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https://www.readbyqxmd.com/read/28230635/valproic-acid-modulates-platelet-and-coagulation-function-ex-vivo
#1
Ted Bambakidis, Simone E Dekker, Ihab Halaweish, Baoling Liu, Vahagn C Nikolian, Patrick E Georgoff, Patryk Piascik, Yongqing Li, Martin Sillesen, Hasan B Alam
Trauma-induced coagulopathy is associated with adverse patient outcome. Animal models demonstrate that histone deacetylase inhibitors, such as valproic acid (VPA), improve survival following injury. While in-vivo data suggest that improved survival may in part be because of an attenuation of coagulopathy, it remains unknown whether this is a direct effect of the drug, or the establishment of an overall prosurvival phenotype. We thus conducted an ex-vivo experiment to determine if VPA has an effect on coagulation and platelet function...
February 21, 2017: Blood Coagulation & Fibrinolysis: An International Journal in Haemostasis and Thrombosis
https://www.readbyqxmd.com/read/28229159/platelet-turnover-predicts-outcome-after-coronary-intervention
#2
Matthias K Freynhofer, Liana Iliev, Veronika Bruno, Miklos Rohla, Florian S Egger, Thomas W Weiss, Wolfgang Hübl, Martin Willheim, Johann Wojta, Kurt Huber
Elevated platelet turnover contributes to high platelet reactivity. High platelet reactivity after percutaneous coronary intervention (PCI) is associated with major adverse cardiovascular events (MACE). The purpose of this study was to determine the prognostic value of platelet turnover and function with regard to MACE after PCI with stent implantation. In this prospective observational study, 486 consecutive patients after PCI on aspirin and clopidogrel were included to determine platelet turnover (mean platelet volume (MPV), reticulated platelet fraction (RPF)) and platelet function (multiple electrode aggregometry (MEA), vasodilator-stimulated phosphoprotein-phosphorylation (VASP-P) assay)...
February 23, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28224106/impact-of-high-dose-vitamin-c-on-platelet-function
#3
Bassem M Mohammed, Kimberly W Sanford, Bernard J Fisher, Erika J Martin, Daniel Contaifer, Urszula Osinska Warncke, Dayanjan S Wijesinghe, Charles E Chalfant, Donald F Brophy, Alpha A Fowler Iii, Ramesh Natarajan
AIM: To examine the effect of high doses of vitamin C (VitC) on ex vivo human platelets (PLTs). METHODS: Platelet concentrates collected for therapeutic or prophylactic transfusions were exposed to: (1) normal saline (control); (2) 0.3 mmol/L VitC (Lo VitC); or (3) 3 mmol/L VitC (Hi VitC, final concentrations) and stored appropriately. The VitC additive was preservative-free buffered ascorbic acid in water, pH 5.5 to 7.0, adjusted with sodium bicarbonate and sodium hydroxide...
February 4, 2017: World Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28207883/application-of-an-optimized-flow-cytometry-based-quantification-of-platelet-activation-pact-monitoring-platelet-activation-in-platelet-concentrates
#4
Cécile H Kicken, Mark Roest, Yvonne M C Henskens, Bas de Laat, Dana Huskens
BACKGROUND: Previous studies have shown that flow cytometry is a reliable test to quantify platelet function in stored platelet concentrates (PC). It is thought that flow cytometry is laborious and hence expensive. We have optimized the flow cytometry-based quantification of agonist induced platelet activation (PACT) to a labor, time and more cost-efficient test. Currently the quality of PCs is only monitored by visual inspection, because available assays are unreliable or too laborious for use in a clinical transfusion laboratory...
2017: PloS One
https://www.readbyqxmd.com/read/28203684/crushed-sublingual-versus-oral-ticagrelor-administration-strategies-in-patients-with-unstable-angina-a-pharmacokinetic-pharmacodynamic-study
#5
Piotr Niezgoda, Joanna Sikora, Malwina Barańska, Adam Sikora, Katarzyna Buszko, Emilia Siemińska, Michał Piotr Marszałł, Jolanta M Siller-Matula, Bernd Jilma, Dimitrios Alexopoulos, Tomasz Fabiszak, Jacek Kubica
Oral administration of crushed ticagrelor tablets turned out to be an efficacious method that improves its pharmacokinetics and pharmacodynamics. This strategy, however, is unlikely to eliminate the drug-drug interaction in patients receiving intravenous morphine, as the impairment of the P2Y12 inhibitor absorption related to decreased propulsive motility of the gastro-intestinal tract is the most likely mechanism of interaction. Thus, we designed a pharmacokinetic and pharmacodynamic study setting the feasibility of platelet inhibition with a loading dose of ticagrelor given as crushed tablets sublingually compared with two other ticagrelor loading dose administration strategies: integral tablet given orally and crushed tablet given orally in patients with unstable angina...
February 16, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28202132/comparison-of-platelet-reactivity-in-black-versus-white-patients-with-acute-coronary-syndromes-after-treatment-with-ticagrelor
#6
Michael A Gaglia, Michael J Lipinski, Thibault Lhermusier, Arie Steinvil, Sarkis Kiramijyan, Shreejana Pokharel, Rebecca Torguson, Dominick J Angiolillo, Lars Wallentin, Robert F Storey, Ron Waksman
Ticagrelor, a potent platelet inhibitor, has primarily been studied in white patients. Platelet reactivity among black patients with acute coronary syndrome (ACS) on ticagrelor, however, is unknown. Our objective was to compare platelet reactivity in black versus white patients with ACS treated with ticagrelor. We conducted a prospective, pharmacodynamic study of 29 black patients with ACS treated with ticagrelor. Platelet reactivity was assessed at 1, 4, and 8 hours after a loading dose of ticagrelor 180 mg and at 30 days on a maintenance dose of ticagrelor 90 mg twice daily...
January 25, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28190562/a-combined-approach-to-early-detect-in-vitro-drug-induced-hemostatic-changes-in-preclinical-safety
#7
Myriam Defontis, Serge Côté, David Ledieu
Early detection of drug-induced alterations of hemostasis is challenging. Drugs can affect different components of the Virchow's triad and measurement of plasmatic coagulation times lacks sensitivity. New techniques for a more global assessment of the hemostasis are now available: the impedance platelet aggregometry, the thromboelastography and the thrombin generation measurement. The aim of this study was to evaluate three techniques (i.e.: Multiplate(®), TEG(®) and CAT) for the in vitro detection of the effect of a drug known to induce hemostatic alterations in a preclinical safety environment...
February 9, 2017: Experimental and Toxicologic Pathology: Official Journal of the Gesellschaft Für Toxikologische Pathologie
https://www.readbyqxmd.com/read/28178148/monitoring-the-hemostasis-with-rotation-thromboelastometry-in-patients-with-acute-stemi-on-dual-antiplatelet-therapy-first-experiences
#8
Matej Samoš, Lucia Stančiaková, Lukáš Duraj, František Kovář, Marián Fedor, Radoslava Šimonová, Tomáš Bolek, Peter Galajda, Ján Staško, Peter Kubisz, Marián Mokáň
Rotation thromboelastometry (ROTEM) is a viscoelastometric point-of-care-test for the complex evaluation of changes in hemostasis, performed in whole blood. However, no prospective study evaluating the efficacy of the antiplatelet therapy using ROTEM was performed.Fifty-six patients (34 men, 22 women, mean age 67.75 years, and age range 34-88 years) with acute ST-elevation myocardial infarction (STEMI), treated with dual antiplatelet therapy, undergoing urgent coronary angiography and percutaneous coronary intervention (PCI) of culprit coronary lesion were included...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28175583/304%C3%A2-the-contribution-of-whole-platelet-aggregometry-to-the-endovascular-management-of-unruptured-aneurysms-an-institutional-experience
#9
Babu Guai Welch, Salah G Aoun, G Lee Pride, Kim L Rickert, Jonathan A White, Kathryn Hoes, Robin Novakovic, R Sarode
No abstract text is available yet for this article.
August 1, 2016: Neurosurgery
https://www.readbyqxmd.com/read/28159767/ticagrelor-reversal-in-vitro-assessment-of-four-haemostatic-agents
#10
Leyla Calmette, Anne-Céline Martin, Bernard Le Bonniec, Diane Zlotnik, Isabelle Gouin-Thibault, Christilla Bachelot-Loza, Pascale Gaussem, Anne Godier
AIM: Management of ticagrelor-induced bleeding is challenging as platelet transfusion is ineffective. An effective strategy is needed. This study aimed to investigate in vitro the efficacy of four haemostatic drugs (HDs), namely recombinant activated factor VII (rFVIIa), fibrinogen concentrate (Fib), tranexamic acid (TXA) and factor XIII concentrate (FXIII) to improve the haemostatic capacity in the presence of ticagrelor. METHODS: Blood was spiked with ticagrelor then supplemented by either HD or control...
February 3, 2017: Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28152437/platelet-function-as-a-risk-factor-for-venous-thromboembolism-in-the-framingham-heart-study
#11
Marja K Puurunen, Shih-Jen Hwang, Chris J O'Donnell, Geoffrey Tofler, Andrew D Johnson
INTRODUCTION: The relationship of venous thromboembolism (VTE) with platelet reactivity is unclear. Platelet function plays a key role in arterial thrombosis. Evidence suggests antiplatelet agents also effects in reducing VTE. Our aim is to describe the role of baseline platelet function in development of VTE in the community-based Framingham Heart Study (FHS) cohort. MATERIALS AND METHODS: Participants in the Framingham Offspring cohort fifth examination and Omni cohort first examination were eligible...
January 25, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28150526/evaluation-of-an-automated-light-transmission-aggregometry
#12
Li-Qin Ling, Juan Liao, Qian Niu, Xia Wang, Jin Jia, Cheng-Hua Zuo, Hong Jiang, Jing Zhou
Light transmission aggregometry (LTA) is the "gold standard" for platelet function assessment, but it is time-consuming and labor intensive. Recently, an automated platelet aggregation method has been developed on a routine coagulation analyzer (Sysmex CS-2100i). In this study, the performances of CS-2100i including repeatability, correlation with a reference aggregometer (Chrono-log Model 700), and the threshold limitation of platelet counts in platelet-rich plasma (PRP) were evaluated for clinical use. The agonists were adenosine diphosphate (ADP), arachidonic acid, collagen, epinephrine, and ristocetin...
February 2, 2017: Platelets
https://www.readbyqxmd.com/read/28150519/ticagrelor-pharmacokinetics-and-pharmacodynamics-in-patients-with-nstemi-after-a-180-mg-loading-dose
#13
Manne Holm, Per Tornvall, Julia Westerberg, Shaym Rihan Hye, Jan van der Linden
The pharmacokinetics after a 180-mg loading dose (LD) of ticagrelor has not been thoroughly investigated in NSTEMI patients. We aimed to compare the ticagrelor uptake and on-treatment platelet reactivity between non-ST-segment elevation myocardial infarction (NSTEMI) patients and a control group of patients with stable coronary artery disease (SCAD) undergoing elective percutaneous coronary intervention. We performed an observational, prospective, single-center study including 40 NSTEMI patients and 20 SCAD controls...
February 2, 2017: Platelets
https://www.readbyqxmd.com/read/28078347/alterations-of-the-platelet-proteome-in-type-i-glanzmann-thrombasthenia-caused-by-different-homozygous-delg-frameshift-mutations-in-itga2b
#14
Stefan Loroch, Katharina Trabold, Stepan Gambaryan, Cora Reiß, Kathrin Schwierczek, Ingrid Fleming, Albert Sickmann, Wolfgang Behnisch, Barbara Zieger, René P Zahedi, Ulrich Walter, Kerstin Jurk
Glanzmann thrombasthenia (GT) is one of the best characterized inherited platelet function disorders but global platelet proteome has not been determined in these patients. We investigated the proteome and function of platelets from two patients with type I GT, caused by different homozygous ITGA2b mutations, from family members and unrelated controls. The global proteome of highly purified washed platelets was quantified by liquid chromatography-mass spectrometry (LC-MS) and targeted MS-methods. Platelet function was analysed by flow cytometry, light transmission aggregometry and flow-based assays...
January 12, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28076455/decreased-platelet-responsiveness-to-clopidogrel-correlates-with-cyp2c19-and-pon1-polymorphisms-in-atherosclerotic-patients
#15
J F M Marchini, M R Pinto, G C Novaes, A V Badran, R B Pavão, G L Figueiredo, I M Lago, M O Lima-Filho, D C Lemos, M Tonani, C M Antloga, L Oliveira, J C Lorenzi, J A Marin-Neto
Clopidogrel and aspirin are the most commonly used medications worldwide for dual antiplatelet therapy after percutaneous coronary intervention. However, clopidogrel hyporesponsiveness related to gene polymorphisms is a concern. Populations with higher degrees of genetic admixture may have increased prevalence of clopidogrel hyporesponsiveness. To assess this, we genotyped CYP2C19, ABCB1, and PON1 in 187 patients who underwent percutaneous coronary intervention. Race was self-defined by patients. We also performed light transmission aggregometry with adenosine diphosphate (ADP) and arachidonic acid during dual antiplatelet therapy...
January 9, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28067098/glycated-albumin-modifies-platelet-adhesion-and-aggregation-responses
#16
Ioana Soaita, Wei Yin, David A Rubenstein
A diabetic vasculature is detrimental to cardiovascular health through the actions of advanced glycation end products (AGEs) on endothelial cells and platelets. Platelets activated by AGEs agonize endothelial responses promoting cardiovascular disease (CVD) development. While it has been established that AGEs can alter platelet functions, little is known about the specific platelet pathways that AGEs modify. Therefore, we evaluated the effects of AGEs on specific salient platelet pathways related to CVDs and whether the effects that AGEs elicit are dependent on glycation extent...
January 9, 2017: Platelets
https://www.readbyqxmd.com/read/28067094/the-use-of-regression-analysis-in-determining-reference-intervals-for-low-hematocrit-and-thrombocyte-count-in-multiple-electrode-aggregometry-and-platelet-function-analyzer-100-testing-of-platelet-function
#17
Gerhardus J A J M Kuiper, Rik Houben, Rick J H Wetzels, Paul W M Verhezen, Rene van Oerle, Hugo Ten Cate, Yvonne M C Henskens, Marcus D Lancé
Low platelet counts and hematocrit levels hinder whole blood point-of-care testing of platelet function. Thus far, no reference ranges for MEA (multiple electrode aggregometry) and PFA-100 (platelet function analyzer 100) devices exist for low ranges. Through dilution methods of volunteer whole blood, platelet function at low ranges of platelet count and hematocrit levels was assessed on MEA for four agonists and for PFA-100 in two cartridges. Using (multiple) regression analysis, 95% reference intervals were computed for these low ranges...
January 9, 2017: Platelets
https://www.readbyqxmd.com/read/28065907/platelet-reactivity-in-human-immunodeficiency-virus-infected-patients-on-dual-antiplatelet-therapy-for-an-acute-coronary-syndrome-the-evere2st-hiv-study
#18
Marie Hauguel-Moreau, Franck Boccara, Anders Boyd, Joe-Elie Salem, Delphine Brugier, Angélique Curjol, Jean-Sébastien Hulot, Mathieu Kerneis, Sophie Galier, Ariel Cohen, Gilles Montalescot, Jean-Philippe Collet, Johanne Silvain
AIM: To explore platelet reactivity on dual antiplatelet therapy (DAPT) of acute coronary syndrome (ACS) patients infected with HIV. METHODS AND RESULTS: Acute coronary syndrome patients infected with HIV (n = 80) were matched to ACS patients without HIV (n = 160) on age, sex, diabetes, and DAPT (aspirin 100%, clopidogrel 68%, prasugrel 31%, ticagrelor 1%). Platelet reactivity was evaluated after ACS (>30 days) by measuring residual platelet aggregation (RPA) to aspirin and to P2Y12 inhibitors with light transmission aggregometry (LTA), VerifyNow aspirin assay (ARU), and P2Y12 assay (PRU) and with the VASP platelet reactivity index (VASP-PRI)...
January 8, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28064328/pharmacogenetics-of-cyp2c19-genetic-polymorphism-on-clopidogrel-response-in-patients-with-ischemic-stroke-from-saudi-arabia
#19
Adel A Alhazzani, Murali Munisamy, Gauthaman Karunakaran
OBJECTIVE: To elucidate the degree of genetic polymorphisms CYP2C19 (CYP2C19*2, CYP2C19*3) of key drug metabolizing enzymes on the antiplatelet effect of clopidogrel response in patients with acute ischemic stroke from Saudi Arabia. METHODS: A case-control study carried out at Neurology Clinics at Asser Central Hospital, Abha, Kingdom of Saudi Arabia from October 2015 to January 2016 and included 25 stroke patients responding to clopidogrel therapy and 25 stroke patients non responding to clopidogrel monotherapy...
January 2017: Neurosciences: the Official Journal of the Pan Arab Union of Neurological Sciences
https://www.readbyqxmd.com/read/28060550/evaluating-platelet-function-disorders-in-children-with-bleeding-tendency-a-single-center-study
#20
Osama Tanous, Orna Steinberg Shemer, Joanne Yacobovich, Meira Zoldan, Yoseph Horovitz, Isaac Yaniv, Esther Rabizadeh, Hannah Tamary, Sigal Nakav, Judith Lahav
Platelet function disorders (PFDs) are a common cause of mild bleeding tendency. However, they cannot be recognized by standard screening studies. The gold standard test for PFD is platelet aggregation, performed by light transmission aggregometry (LTA). A newer and less validated method is the closure time (CT), performed by the platelet function Analyzer 100 (PFA-100). Data regarding the validity of these tests in children are limited. The aim of this study was to evaluate the usefulness of LTA and PFA-100 for the diagnosis of pediatric patients with bleeding tendency...
January 6, 2017: Platelets
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