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https://www.readbyqxmd.com/read/27917714/antiplatelet-and-anticoagulation-treatment-in-patients-with-thrombocytopenia
#1
Nuccia Morici, Silvia Cantoni, Paola Vallerio, Marco Cattaneo, Stefano Savonitto
Thrombocytopenia (TP) is a common finding in patients hospitalized for cardiovascular causes and needing antiplatelet and anticoagulant therapies. However, TP is not only a numeric parameter, but mostly a dynamic condition affected by the patients' underlying disorders and concomitant treatments. Platelets are important players in the hemostatic process, taking part to both primary and secondary hemostasis. Although both TP and antithrombotic treatment contribute to the risk of bleeding, the complexity of the pathogenesis of bleeding events makes it difficult to predict them accurately simply based on these two parameters...
December 5, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27913536/reversal-of-direct-oral-anticoagulants-a-practical-approach
#2
Andrew W Shih, Mark A Crowther
Direct oral anticoagulants (DOACs) have at least noninferior efficacy compared with other oral anticoagulants and have ancillary benefits, including overall better safety profiles, lack of the need for routine monitoring, rapid onset of action, and ease of administration. Reversal of these agents may be indicated in certain situations such as severe bleeding and for perioperative management. DOAC-associated bleeding should be risk stratified: patients with moderate or severe bleeding should have the DOAC discontinued and reversal strategies should be considered...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27900590/assessment-of-oxidative-nitrative-modifications-of-plasma-proteins-selected-rotem-parameters-and-kinetics-of-fibrinogen-polymerization-in-patients-with-multiple-myeloma-at-diagnosis
#3
W Nowak, J Treliński, K Chojnowski, J Matczak, M Robak, M Misiewicz, P Nowak
Patients with multiple myeloma (MM) are at increased risk of thrombosis. Growing evidence indicates that oxidative and nitrative modifications of proteins, including fibrinogen, may lead to changes in hemostasis. The study compares samples from patients with MM at diagnosis and healthy volunteers with regard to the oxidative/nitrative modifications of proteins, ROTEM and thrombin-catalyzed fibrin polymerization. The content of carbonyl groups in plasma proteins of patients with MM was significantly higher than in controls (2...
January 2017: Medical Oncology
https://www.readbyqxmd.com/read/27886814/regulation-of-platelet-activation-and-coagulation-and-its-role-in-vascular-injury-and-arterial-thrombosis
#4
REVIEW
Maurizio Tomaiuolo, Lawrence F Brass, Timothy J Stalker
Hemostasis requires tightly regulated interaction of the coagulation system, platelets, blood cells, and vessel wall components at a site of vascular injury. Dysregulation of this response may result in excessive bleeding if the response is impaired, and pathologic thrombosis with vessel occlusion and tissue ischemia if the response is robust. Studies have elucidated the major molecular signaling pathways responsible for platelet activation and aggregation. Antithrombotic agents targeting these pathways are in clinical use...
January 2017: Interventional cardiology clinics
https://www.readbyqxmd.com/read/27876598/antithrombotic-activity-of-batroxase-a-metalloprotease-from-bothrops-atrox-venom-in-a-model-of-venous-thrombosis
#5
Anna L Jacob-Ferreira, Danilo L Menaldo, Marco A Sartim, Thalita B Riul, Marcelo Dias-Baruffi, Suely V Sampaio
BACKGROUND: Snake venoms are great sources of bioactive molecules, which may be used as models for new drugs. Toxins that interfere in hemostasis have received considerable attention over the years. OBJECTIVES: This study aimed at the evaluation of the antithrombotic activity of Batroxase, a P-I metalloprotease from Bothrops atrox venom, in an animal model of venous thrombosis. METHODS: The antithrombotic activity of Batroxase was tested in vivo in a model based on two factors of the Virchow's Triad: blood flow alterations (partial stenosis of the inferior vena cava), and vessel wall injury (10% ferric chloride for 5min), in comparison with sodium heparin (positive control) and saline (negative control)...
November 19, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27876233/role-of-platelets-in-neutrophil-extracellular-trap-net-production-and-tissue-injury
#6
REVIEW
Seok-Joo Kim, Craig N Jenne
In addition to their well-known role as the cellular mediator of thrombosis, numerous studies have identified key roles for platelets during various disease processes. Importantly, platelets play a critical role in the host immune response, directly interacting with, and eliminating pathogens, from the blood stream. In addition to pathogen clearance, platelets also contribute to leukocyte recruitment at sites of infection and inflammation, and modulate leukocyte activity. Platelet interaction with activated neutrophils is a potent inducer of neutrophil extracellular trap (NET)...
November 18, 2016: Seminars in Immunology
https://www.readbyqxmd.com/read/27871158/platelet-shape-changes-and-cytoskeleton-dynamics-as-novel-therapeutic-targets-for-anti-thrombotic-drugs
#7
REVIEW
Eun-Kyung Shin, Hanseul Park, Ji-Yoon Noh, Kyung-Min Lim, Jin-Ho Chung
Platelets play an essential role in hemostasis through aggregation and adhesion to vascular injury sites but their unnecessary activation can often lead to thrombotic diseases. Upon exposure to physical or biochemical stimuli, remarkable platelet shape changes precede aggregation or adhesion. Platelets shape changes facilitate the formation and adhesion of platelet aggregates, but are readily reversible in contrast to the irrevocable characteristics of aggregation and adhesion. In this dynamic phenomenon, complex molecular signaling pathways and a host of diverse cytoskeleton proteins are involved...
November 25, 2016: Biomolecules & Therapeutics
https://www.readbyqxmd.com/read/27866916/blood-coagulation-in-immunothrombosis-at-the-frontline-of-intravascular-immunity
#8
REVIEW
Florian Gaertner, Steffen Massberg
While hemostasis is the physiological process that prevents blood loss after vessel injury, thrombosis is often portrayed as a pathologic event involving blood coagulation and platelet aggregation eventually leading to vascular occlusion and tissue damage. However, recent work suggests that thrombosis can also be a physiological process, termed immunothrombosis, initiated by the innate immune system providing a first line of defense to locally control infection. Fibrin forms the structural basis of immunothrombotic clots and its assembly involves the concerted action of coagulation factors, platelets and leukocytes...
November 17, 2016: Seminars in Immunology
https://www.readbyqxmd.com/read/27866581/thrombosis-hypercoagulable-states-and-anticoagulants
#9
REVIEW
Marie A Hollenhorst, Elisabeth M Battinelli
Patients with derangements of secondary hemostasis resulting from inherited or acquired thrombophilias are at increased risk of venous thromboemboli (VTE). Evaluation of a patient with suspected VTE proceeds via evidence-based algorithms that involve computing a pretest probability based on the history and physical examination; this guides subsequent work-up, which can include D dimer and/or imaging. Testing for hypercoagulable disorders should be pursued only in patients with VTE with an increased risk for an underlying thrombophilia...
December 2016: Primary Care
https://www.readbyqxmd.com/read/27865965/palladin-is-involved-in-platelet-activation-and-arterial-thrombosis
#10
Xuejiao Chen, Xuemei Fan, Juan Tan, Panlai Shi, Xiyi Wang, Jinjin Wang, Ying Kuang, Jian Fei, Junling Liu, Suying Dang, Zhugang Wang
The dynamics of actin cytoskeleton have been shown to play a critical role during platelet activation. Palladin is an actin-associated protein, serving as a cytoskeleton scaffold to bundle actin fibers and actin cross linker. The functional role of palladin on platelet activation has not been investigated. Here, we characterized heterozygous palladin knockout (palladin(+/-)) mice to elucidate the platelet-related functions of palladin. The results showed that palladin was expressed in platelets and moderate palladin deficiency accelerated hemostasis and arterial thrombosis...
November 10, 2016: Thrombosis Research
https://www.readbyqxmd.com/read/27861945/rapid-hemostasis-in-a-sheep-model-using-particles-that-propel-thrombin-and-tranexamic-acid
#11
James R Baylis, Andres Finkelstein-Kulka, Luis Macias-Valle, Jamil Manji, Michael Lee, Elina Levchenko, Christopher Okpaleke, Salahuddin Al-Salihi, Amin Javer, Christian J Kastrup
OBJECTIVES/HYPOTHESIS: Bleeding during endoscopic sinus surgery and open surgeries can easily obstruct the surgeons' field of view and increase morbidity and risk of intraoperative complications. Intraoperative bleeding could potentially be addressed by a hemostatic agent that safely disperses itself through the escaping blood. We tested the safety and efficacy of a self-propelling formulation of thrombin and tranexamic acid (SPTT) in stopping bleeding in a paranasal sinus injury and in an open surgical carotid injury sheep model...
November 10, 2016: Laryngoscope
https://www.readbyqxmd.com/read/27861597/comparison-of-two-diagnostic-scores-of-disseminated-intravascular-coagulation-in-pregnant-women-admitted-to-the-icu
#12
Marie Jonard, Anne Sophie Ducloy-Bouthors, François Fourrier
OBJECTIVE: To compare the validity of two previously published diagnostic scores of disseminated intravascular coagulation (DIC) in pregnant women admitted to ICU for an acute thrombotic or hemorrhagic complication of delivery and postpartum. METHODS: This was a population based retrospective study of 154 patients admitted to ICU for severe delivery and postpartum complications in a University Hospital. A recently published score (adapted to physiological changes of pregnancy and based on three components: platelet count, prothrombin time difference and fibrinogen) was compared to the International Society for Thrombosis and Hemostasis (ISTH) score (based on four components: platelet count, fibrinogen, prothrombin time, and fibrin related marker)...
2016: PloS One
https://www.readbyqxmd.com/read/27829265/recent-advances-in-thrombosis-and-hemostasis-part-i
#13
Sam Schulman, Md Shahidul Islam
No abstract text is available yet for this article.
November 2016: Seminars in Thrombosis and Hemostasis
https://www.readbyqxmd.com/read/27829061/rgs10-negatively-regulates-platelet-activation-and-thrombogenesis
#14
Nicole R Hensch, Zubair A Karim, Kirk M Druey, Malú G Tansey, Fadi T Khasawneh
Regulators of G protein signaling (RGS) proteins act as GTPase activating proteins to negatively regulate G protein-coupled receptor (GPCR) signaling. Although several RGS proteins including RGS2, RGS16, RGS10, and RGS18 are expressed in human and mouse platelets, the respective unique function(s) of each have not been fully delineated. RGS10 is a member of the D/R12 subfamily of RGS proteins and is expressed in microglia, macrophages, megakaryocytes, and platelets. We used a genetic approach to examine the role(s) of RGS10 in platelet activation in vitro and hemostasis and thrombosis in vivo...
2016: PloS One
https://www.readbyqxmd.com/read/27809712/first-report-of-the-point-of-care-teg-a-technical-validation-study-of-the-teg-6s-system
#15
Paul A Gurbel, Kevin P Bliden, Udaya S Tantry, Amy L Monroe, Adina A Muresan, Norman E Brunner, Carlos G Lopez-Espina, Peter R Delmenico, Eli Cohen, Gabriel Raviv, DeAnna L Haugen, Mark H Ereth
Thrombelastography (TEG) measured by the TEG5000 Hemostasis Analyzer is an established but the labor-intensive method for assessing global hemostasis. The first true point-of-care TEG, the TEG6s system, uses resonance-frequency viscoelasticity measurements and a disposable multi-channel microfluidic cartridge to assess hemostasis and response to antiplatelet therapy. TEG assays (n = 5,100) were performed on the blood of healthy volunteers (n = 157) and patients undergoing coronary revascularization at three hospitals (n = 300)...
November 2016: Platelets
https://www.readbyqxmd.com/read/27803165/galpha13-switch-region-2-relieves-talin-autoinhibition-to-activate-alphaiibbeta3-integrin
#16
James Schiemer, Andrew Bohm, Li Lin, Glenn Merrill-Skoloff, Robert Flaumenhaft, Jin-Sheng Huang, Guy C Le Breton, Athar H Chishti
Integrins function as bi-directional signaling transducers that regulate cell-cell and cell-matrix signals across the membrane. A key modulator of integrin activation is talin, a large cytoskeletal protein that exists in an autoinhibited state in quiescent cells. Talin is a large 235 kDa protein comprised of an N-terminal 45 kDa FERM domain, also known as the talin head domain (THD), and a series of helical bundles known as the rod domain. The talin head domain consists of 4 distinct lobes designated as F0-F3...
November 1, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27801884/changing-concepts-of-cirrhotic-coagulopathy
#17
REVIEW
Armando Tripodi, Massimo Primignani, Pier M Mannucci, Stephen H Caldwell
The state of clinical art of the coagulopathy of cirrhosis changed considerably over the last decade. Until 2005, cirrhosis was considered as the epitome of the hemorrhagic coagulopathies and the abnormal hemostasis tests associated with the disease were corrected with infusion of fresh frozen plasma or platelets to minimize the risk of bleeding. Since that time, a great deal of work has been done and there is now a change of paradigm. The prothrombin time once considered as an isolated measure of bleeding risk was rejected, and cirrhosis shifted from a purely hemorrhagic construct to a mixed and thrombosis-prone paradigm...
November 1, 2016: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/27796581/treatment-of-accidental-perianal-injection-of-topical-thrombin-with-intravenous-antithrombin
#18
Vance G Nielsen, Samata R Paidy, Whitney McLeod, Alexandra Fox, Valentine N Nfonsam
While topical thrombin application can markedly improve surgical hemostasis, rapid absorption of thrombin can result in pulmonary embolism and death. We report a case of accidental interstitial infiltration of topical thrombin after hemorrhoidectomy that was treated with administration of human antithrombin and heparin anticoagulation. Except for a marked decrease in antithrombin activity from super normal to normal values, the patient exhibited no laboratory or clinical signs of pulmonary embolism, thrombin mediated consumptive loss of procoagulants, or regional thrombosis...
October 28, 2016: Journal of Thrombosis and Thrombolysis
https://www.readbyqxmd.com/read/27795525/how-to-choose-and-understand-clinical-laboratory-tests-in-daily-clinical-management-of-hematologic-diseases
#19
Yoshinobu Seki
General statements have been published regarding the clinical laboratory tests for thrombosis and hemostasis to be used by hematologists who do not specialize in this field. Screening tests for bleeding are bleeding time, capillary fragility test, platelet count, prothrombin time, activated partial thromboplastin time (APTT), fibrinogen, fibrin/fibrinogen degradation products (FDP), and the cross mixing test conducted by measuring APTT. Screening tests for thrombosis and related factors include measurements of FDP, D-dimer, and thrombin-antithrombin complex...
2016: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
https://www.readbyqxmd.com/read/27795523/diagnosis-and-management-of-dic-complicated-by-hematological-malignancies
#20
Takayuki Ikezoe
The clinical features noted in individuals with disseminated intravascular coagulation (DIC) complicated by hematological malignancies include life threatening hemorrhage that is associated with thrombocytopenia and consumptive deficiency of coagulation factors. Exacerbation of DIC after the initiation of chemotherapy is also related to fatal hemorrhage. The Japanese Society of Thrombosis and Hemostasis recently proposed provisional DIC diagnostic criteria allowing evaluation of hypercoagulable markers such as soluble fibrin and thrombin-antithrombin complex to help physicians to diagnose DIC and initiate treatment in the early phase of coagulopathy...
2016: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
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