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https://www.readbyqxmd.com/read/28804832/measuring-direct-oral-anticoagulants
#1
Robert C Gosselin, Jonathan Douxfils
Direct oral anticoagulants (DOACs) can be quantified using methods that can be performed in any clinical or research laboratory using manual or automated instrument platforms. Dabigatran etexilate, the oral direct thrombin inhibitor, can be quantified by drug-calibrated clot or chromogenic-based assays using either thrombin or ecarin as substrates. Oral direct anti-Xa inhibitors, such as rivaroxaban, apixaban, and edoxaban, can be quantified with drug-calibrated anti-Xa kits or reagents as typically used for measuring heparins (unfractionated, low molecular weight, or pentasaccharides)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28803708/anti-phospholipid-syndrome-current-opinion-on-mechanisms-involved-laboratory-characterization-and-diagnostic-aspects
#2
REVIEW
Jean Amiral, Marie Peyrafitte, Claire Dunois, Anne Marie Vissac, Jerard Seghatchian
Anti-phospholipid syndrome is a complex and severe clinical situation, associated with symptoms such as recurrent thrombosis, arterial or venous, at any site, pregnancy loss, and other related syndromes. These clinical burdens, are highly variable from patient to patient, and are associated with biological abnormalities, such as the presence of the Lupus Anticoagulant or phospholipid dependent antibodies, confirmed on two occasions at least 12 weeks apart. From the diagnosis standpoint, both, functional (clotting) or immunological assays, are difficult to standardize and to optimize, due to the absence of reference material, or a characteristic clinical group, and international reference preparations...
July 15, 2017: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/28777290/anti-coagulant-and-anti-thrombotic-properties-of-blacklip-abalone-haliotis-rubra-in-vitro-and-animal-studies
#3
Hafiz Ansar Rasul Suleria, Paul P Masci, Kong-Nan Zhao, Rama Addepalli, Wei Chen, Simone A Osborne, Glenda C Gobe
Sulphated polysaccharides with anti-thrombotic and anti-coagulant activities have been found in various marine biota. In this study, a previously characterised anti-thrombotic and anti-coagulant extract from blacklip abalone was fractionated by anion exchange chromatography (AEC), pooled (on a sulphated polysaccharide basis) and administered to Wistar rats via oral gavage (N = 8) for assessment as an oral therapeutic. To ensure that the preparation had anti-coagulant activity prior to oral administration, it was assessed in rat blood by thromboelastography (TEG) significantly increasing reaction (R) time (or time until clot formation)...
August 4, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28755727/plasma-antiphospholipid-antibodies-effects-on-activated-partial-thromboplastin-time-assays
#4
Ke Yao, Lingyun Zhang, Hang Zhou, Ning Tang, Dengju Li
BACKGROUND: Activated partial thromboplastin time (aPTT) assays can be affected by plasma antiphospholipid antibodies (aPLs), but the degree of the interference is not easy to predict. This study aimed to investigate the effects on aPTT assay results of different types and combinations of aPLs, including anti-β2-glycoprotein I antibodies, anticardiolipin antibodies and lupus anticoagulant. MATERIALS AND METHODS: We retrospectively collected clinical information and laboratory tests from aPL-positive patients...
July 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28748111/dimerized-domain-v-of-beta2-glycoprotein-i-is-sufficient-to-upregulate-procoagulant-activity-in-pma-treated-u937-monocytes-and-require-intact-residues-in-two-phospholipid-binding-loops
#5
Alexey Kolyada, David A Barrios, Natalia Beglova
Upregulation of the procoagulant activity of monocytes by antibodies to beta2- glycoprotein I (β2GPI) is one of the mechanisms contributing to thrombosis in antiphospholipid syndrome. Current knowledge about receptors responsible for the upregulation of procoagulant activity by β2GPI/anti-β2GPI complexes and their binding sites on β2GPI is far from complete. We quantified the procoagulant activity expressed by phorbol 12-myristate 13-acetate (PMA)- differentiated U937 cells by measuring clotting kinetics in human plasma exposed to stimulated cells...
June 2017: Antibodies
https://www.readbyqxmd.com/read/28718695/enhanced-procoagulant-activity-of-platelets-after-chemotherapy-in-non-small-cell-lung-cancer
#6
Ruishuang Ma, Yayan Bi, Junjie Kou, Jin Zhou, Jialan Shi
The procoagulant status of patients with non-small cell lung cancer (NSCLC) after chemotherapy is poorly characterized and the role of platelets in hypercoagulative state of NSCLC is unknown. The aim of this study was to evaluate the procoagulant activity (PCA) of platelets in NSCLC before and after chemotherapy. The subjects were 52 patients newly diagnosed with NSCLC. The patients had decreased clotting time compared with healthy subjects, and the thrombin-antithrombin complex increased 2.5 fold after chemotherapy...
July 18, 2017: Cancer Biology & Therapy
https://www.readbyqxmd.com/read/28693359/coagulation-monitoring-correlation-with-heparin-dose-in-pediatric-extracorporeal-life-support
#7
Katie Moynihan, Kerry Johnson, Lahn Straney, Christian Stocker, Ben Anderson, Prem Venugopal, John Roy
OBJECTIVES: Extracorporeal Life Support (ECLS) risks thrombotic and hemorrhagic complications. Optimal anti-coagulation monitoring is controversial. We compared coagulation tests evaluating the heparin effect in pediatric ECLS. METHODS: A retrospective study of children (<18yrs) undergoing ECLS over 12 months in a tertiary pediatric intensive care unit (PICU). Variables included anti-Factor Xa activity (anti-Xa), activated partial thromboplastin time (aPTT), activated clotting time (ACT) and thromboelastogram (TEG(®)6s) parameters: ratio and delta reaction (R) times (the ratio and difference, respectively, between R times in kaolin assays with and without heparinase)...
July 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28682477/preclinical-safety-and-efficacy-of-andexanet-alfa-in-animal-models
#8
G Lu, S J Hollenbach, D C Baker, S Tan, A Hutchaleelaha, J T Curnutte, P B Conley
Essentials There is currently no approved reversal agent for factor Xa (FXa) inhibitors Andexanet alfa has been developed to reverse the anticoagulant effects of FXa inhibitors Andexanet reduced blood loss and anticoagulation markers in rivaroxaban-anticoagulated rabbits Andexanet was well tolerated in monkeys and rats, with no evidence of prothrombotic activity SUMMARY: Background Andexanet alfa is a recombinant modified form of factor Xa (FXa), designed to bind to and reverse the anticoagulant activity of FXa inhibitors...
July 6, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28679384/transperineal-ultrasound-guided-prostate-biopsy-is-safe-even-when-patients-are-on-combination-antiplatelet-and-or-anticoagulation-therapy
#9
Kimitoshi Saito, Satoshi Washino, Yuhki Nakamura, Tsuzumi Konishi, Masashi Ohshima, Yoshiaki Arai, Tomoaki Miyagawa
BACKGROUND: To assess whether hemorrhagic complications associated with transperineal prostate biopsy increased in patients on antiplatelet and/or anticoagulant therapy. METHODS: In total, 598 consecutive patients underwent transperineal prostate biopsy. The medication group comprised patients who took anti-thromboembolic agents, and the control group comprised those who did not take these agents. No anti-thromboembolic agent was stopped before, during, or after prostate biopsy in the medication group...
July 5, 2017: BMC Urology
https://www.readbyqxmd.com/read/28672932/intravascular-application-of-electrocautery-in-a-rabbit-model-of-abdominal-aortic-endarterectomy
#10
Chuan Wang, Yi Xin, Na Li, Diankun Li, Jingxing Li, Chengxiong Gu
Effective therapies for preventing perioperative complications such as thrombosis and inflammation after coronary endarterectomy (CE) are lacking. Electrocoagulation electrotomes have been routinely used in surgery for their cutting, clotting, and hemostatic properties. As strong flattening tools, their electrocautery function may prevent mechanical intimal-adventitial injury to arterial circulation and attenuate stenosis. The present study investigated the effects of intravascular application of electrocautery on ameliorating inflammation and thrombosis in a rabbit model of abdominal aortic endarterectomy...
July 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28669410/thrombin-activatable-fibrinolysis-inhibitor-tafi-a-possible-link-between-coagulation-and-complement-activation-in-the-antiphospholipid-syndrome-aps
#11
Giorgia Grosso, Anna Vikerfors, Barry Woodhams, Mariette Adam, Katarina Bremme, Margareta Holmström, Anna Ågren, Anna Eelde, Maria Bruzelius, Elisabet Svenungsson, Aleksandra Antovic
BACKGROUND: Thrombosis and complement activation are pathogenic features of antiphospholipid syndrome (APS). Their molecular link is Plasma carboxypeptidase-B, also known as thrombin activatable fibrinolysis inhibitor (TAFIa), which plays a dual role: anti-fibrinolytic, by cleaving carboxyl-terminal lysine residues from partially degraded fibrin, and anti-inflammatory, by downregulating complement anaphylatoxins C3a and C5a. AIM: To investigate the levels of TAFI (proenzyme) and TAFIa (active enzyme) in relation to complement activation, fibrin clot permeability and fibrinolytic function in clinical and immunological subsets of 52 APS patients and 15 controls...
June 24, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28652670/satisfaction-with-and-adherence-to-warfarin-treatment-a-cross-sectional-study-among-sudanese-patients
#12
Tarig Yousif Mohamed Eltayeb, Malik Suliman Mohamed, Abubaker Ibrahim Elbur, Ahmed Sayed Ahmed Elsayed
BACKGROUND: Satisfaction with and adherence to oral anticoagulant treatment are important measures that decrease morbidity and mortality. Higher satisfaction and adherence to warfarin therapy was found to be associated among other factors with good International Normalized Ratio (INR) control. OBJECTIVES: To assess patient satisfaction with and adherence to oral anticoagulant therapy and to identify predictors of the two studied domains. METHODS: A cross-sectional study was conducted at the Cardiothoracic Clinic in Alshaab Teaching Hospital; Khartoum; Sudan during March-April 2015...
July 2017: Journal of the Saudi Heart Association
https://www.readbyqxmd.com/read/28632925/a-kallikrein-targeting-rna-aptamer-inhibits-the-intrinsic-pathway-of-coagulation-and-reduces-bradykinin-release
#13
K-A Steen-Burrell, J Layzer, B A Sullenger
BACKGROUND: Plasma kallikrein is a serine protease that plays an integral role in many biological processes including coagulation, inflammation, and fibrinolysis. The main function of kallikrein in coagulation is the amplification of activated factor XIIa (FXIIa) generation which ultimately leads to thrombin generation and fibrin clot formation. Kallikrein is generated by FXIIa-mediated cleavage of the zymogen, prekallikrein which is usually complexed with the nonenzymatic cofactor, high-molecular-weight kininogen (HK)...
June 20, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28623360/endothelial-cell-derived-extracellular-vesicles-size-dependently-exert-procoagulant-activity-detected-by-thromboelastometry
#14
Wolfgang Holnthoner, Cornelia Bonstingl, Carina Hromada, Severin Muehleder, Johannes Zipperle, Stefan Stojkovic, Heinz Redl, Johann Wojta, Herbert Schöchl, Johannes Grillari, Sylvia Weilner, Christoph J Schlimp
Endothelial cells (ECs) are major modulators of hemostasis by expressing and releasing pro- and anticoagulant mediators into the circulation. Previous studies showed that cultured ECs release procoagulant mediators into cell culture supernatants as evidenced by the reduction of viscoelastic clotting time. This effect was reversed with an anti-tissue factor antibody. Here, we aimed to investigate whether tissue factor (TF) was released by endothelial-derived extracellular vesicles (EVs) and which portion of the released vesicles displays the most prominent procoagulant properties...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28611512/hepatitis-a-virus-infection-and-hepatitis-a-vaccination-in-human-immunodeficiency-virus-positive-patients-a-review
#15
REVIEW
Kuan-Yin Lin, Guan-Jhou Chen, Yu-Lin Lee, Yi-Chia Huang, Aristine Cheng, Hsin-Yun Sun, Sui-Yuan Chang, Chun-Eng Liu, Chien-Ching Hung
Hepatitis A virus (HAV) is one of the most common infectious etiologies of acute hepatitis worldwide. The virus is known to be transmitted fecal-orally, resulting in symptoms ranging from asymptomatic infection to fulminant hepatitis. HAV can also be transmitted through oral-anal sex. Residents from regions of low endemicity for HAV infection often remain susceptible in their adulthood. Therefore, clustered HAV infections or outbreaks of acute hepatitis A among men who have sex with men and injecting drug users have been reported in countries of low endemicity for HAV infection...
May 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28611276/vitamin-k-and-its-analogs-potential-avenues-for-prostate-cancer-management
#16
REVIEW
Subramanyam Dasari, Syed M Ali, Guoxing Zheng, Aoshuang Chen, Venkata Satish Dontaraju, Maarten C Bosland, Andre Kajdacsy-Balla, Gnanasekar Munirathinam
Epidemiological studies have demonstrated a relationship between cancer incidence and dietary habits. Especially intake of certain essential nutrients like vitamins has been shown to be beneficial in experimental studies and some clinical trials. Vitamin K (VK) is an essential nutrient involved in the blood clotting cascade, and there are considerable experimental data demonstrating its potential anticancer activity in several cancer types including prostate cancer. Previous in vitro and in vivo studies have focused mainly on anti-oxidative effects as the underlying anticancer mechanism of VK...
May 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/28606852/new-prodrugs-of-metformin-do-not-influence-the-overall-haemostasis-potential-and-integrity-of-the-erythrocyte-membrane
#17
Magdalena Markowicz-Piasecka, Joanna Sikora, Łukasz Mateusiak, Elżbieta Mikiciuk-Olasik, Kristiina M Huttunen
Although metformin, an oral anti-diabetic drug, has been found to have multidirectional effects over the past decade, it is characterised by unfavourable pharmacokinetic properties. This study discusses the effects of metformin, phenformin and three prodrugs of metformin on the haemostasis and integrity of Red Blood Cells (RBCs). The influence of examined biguanide derivatives on haemostasis was evaluated spectrophotometrically by clot formation and lysis test (CL-test) at 405nm. The extrinsic and intrinsic coagulation pathway were examined by measuring the PT (Prothrombin Time) and aPTT (Activated Partial Tromboplastin Time)...
June 10, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28597369/first-report-of-real-time-monitoring-of-coagulation-function-potential-and-igg-subtype-of-anti-fviii-autoantibodies-in-a-child-with-acquired-hemophilia-a-associated-with-streptococcal-infection-and-amoxicillin
#18
Masahiro Takeyama, Keiji Nogami, Takahiro Kajimoto, Kenichi Ogiwara, Tomoko Matsumoto, Midori Shima
We describe an 8-year-old boy with acquired hemophilia A (AHA) associated with streptococcal infection and amoxicillin. Laboratory data revealed low factor VIII activity (FVIII:C, 1.5 IU/dl), and FVIII inhibitor (15.9 BU/ml). Comprehensive coagulation function assays, including rotation thromboelastometry (ROTEM(®)), revealed a markedly prolonged clotting time. Thrombin and plasmin generation (TG/PG) appeared to be moderately impaired. The inhibitor epitope of his anti-FVIII autoantibody recognized light and heavy chains...
June 8, 2017: International Journal of Hematology
https://www.readbyqxmd.com/read/28592212/low-dose-versus-high-dose-anti-snake-venom-therapy-in-the-treatment-of-haematotoxic-snake-bite-in-south-india
#19
Imanto M Joseph, Cijoy K Kuriakose, Anand Vimal Dev, George A Philip
Most of the studies on the appropriate dose of anti-snake venom (ASV) are from tertiary hospitals and the guidelines are unclear. Our observational study compared the outcomes of two prevalent treatment regimes for haematotoxic snake bite in a secondary care hospital in South India. The time to normalisation of whole blood clotting time, mortality and complications were not different between the groups. The average dose of ASV required in the low and high dose groups were 106 mL and 246 mL, respectively...
January 1, 2017: Tropical Doctor
https://www.readbyqxmd.com/read/28580870/application-of-microfluidic-devices-in-studies-of-thrombosis-and-hemostasis
#20
Changjie Zhang, Sriram Neelamegham
Due to the importance of fluid flow during thrombotic episodes, it is quite appropriate to study clotting and bleeding processes in devices that have well-defined fluid shear environments. Two common devices for applying these defined shear stresses include the cone-and-plate viscometer and parallel-plate flow chamber. While such tools have many salient features, they require large amounts of blood or other protein components. With growth in the area of microfluidics over the last two decades, it has become feasible to miniaturize such flow devices...
July 2017: Platelets
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