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https://www.readbyqxmd.com/read/28652649/bleeding-with-the-artificial-heart-gastrointestinal-hemorrhage-in-cf-lvad-patients
#1
EDITORIAL
Grigoriy E Gurvits, Elena Fradkov
Continuous-flow left ventricular assist devices (CF-LVADs) have significantly improved outcomes for patients with end-stage heart failure when used as a bridge to cardiac transplantation or, more recently, as destination therapy. However, its implantations carries a risk of complications including infection, device malfunction, arrhythmias, right ventricular failure, thromboembolic disease, postoperative and nonsurgical bleeding. A significant number of left ventricular assist devices (LVAD) recipients may experience recurrent gastrointestinal hemorrhage, mainly due to combination of antiplatelet and vitamin K antagonist therapy, activation of fibrinolytic pathway, acquired von Willebrand factor deficiency, and tendency to develop small intestinal angiodysplasias due to increased rotary speed of the pump...
June 14, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28652401/interaction-between-multimeric-von-willebrand-factor-and-complement-a-fresh-look-to-the-pathophysiology-of-microvascular-thrombosis
#2
Serena Bettoni, Miriam Galbusera, Sara Gastoldi, Roberta Donadelli, Chiara Tentori, Giuseppina Spartà, Elena Bresin, Caterina Mele, Marta Alberti, Agustin Tortajada, Hugo Yebenes, Giuseppe Remuzzi, Marina Noris
von Willebrand factor (VWF), a multimeric protein with a central role in hemostasis, has been shown to interact with complement components. However, results are contrasting and inconclusive. By studying 20 patients with congenital thrombotic thrombocytopenic purpura (cTTP) who cannot cleave VWF multimers because of genetic ADAMTS13 deficiency, we investigated the mechanism through which VWF modulates complement and its pathophysiological implications for human diseases. Using assays of ex vivo serum-induced C3 and C5b-9 deposits on endothelial cells, we documented that in cTTP, complement is activated via the alternative pathway (AP) on the cell surface...
June 26, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28652214/elevated-levels-of-vwf-and-hmgb1-are-associated-with-disease-severity-and-clinical-outcome-of-scrub-typhus
#3
Hongliu Chen, Zong Ning, Ying Qiu, Yuanli Liao, Haihua Chang, Yuanyuan Ai, Yinghua Wei, Yiming Deng, Ying Shen
OBJECTIVE: This study aimed to investigate whether von Willebrand factor (vWF) and high mobility group box 1(HMGB1) were associated with severity and clinical outcome of scrub typhus and to seek novel biomarkers for surveillance and prognosis prediction of this infection. METHODS: Serum concentrations of vWF and HMGB1 were measured twice by enzyme linked immunosorbent assay (ELISA) for scrub typhus patients (n = 103), one prior to doxycycline therapy and the other at the 7th day of doxycycline therapy, and once for health controls (n = 32)...
June 23, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28651990/a-novel-function-of-vitellogenin-subdomain-vwf-type-d-as-a-toxin-binding-protein-in-the-pufferfish-takifugu-pardalis-ovary
#4
Xianzhe Yin, Aya Kiriake, Akira Ohta, Yoichiro Kitani, Shoichiro Ishizaki, Yuji Nagashima
Marine pufferfish of the Tetraodontidae family contain high levels of tetrodotoxin (TTX) in the liver and ovary. TTX is suggested to transfer from the liver to the ovary in female pufferfish during maturation. TTX in pufferfish eggs may act as a repellent against predators and as a sexual pheromone to attract male pufferfish. The toxification mechanism of the pufferfish ovary is poorly understood. Here we evaluated the chemical form of TTX and its related substances in the ovary of the panther pufferfish Takifugu pardalis by LC-ESI/MS...
June 23, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28651806/von-willebrand-factor-deposition-and-adamts-13-consumption-in-allograft-tissue-of-thrombotic-microangiopathy-like-disorder-after-living-donor-liver-transplantation-a-case-report
#5
S Nakanuma, T Miyashita, H Hayashi, Y Ohbatake, H Takamura, M Okazaki, T Yamaguchi, S Sakai, I Makino, K Oyama, H Tajima, I Ninomiya, S Fushida, T Ohta
BACKGROUND: Thrombotic microangiopathy (TMA) pathogenesis after living donor liver transplantation (LDLT) is thought to be caused by release of unusually large von Willebrand factor multimers (UL-vWFMs) resulting from sinusoidal endothelial cell damage and induction of platelet adhesion and aggregation. A decrease in a disintegrin-like and metalloproteinase with thrombospondin type 1 motifs-13 (ADAMTS-13) that cleave UL-vWFMs might cause excessive UL-vWFMs activity and result in platelet thrombus formation...
June 23, 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28650450/endothelial-damage-is-aggravated-in-acute-gvhd-and-could-predict-its-development
#6
E Mir, M Palomo, M Rovira, A Pereira, G Escolar, O Penack, E Holler, E Carreras, M Diaz-Ricart
The aim of the present study was to explore whether there is enhanced endothelial dysfunction in patients developing acute GvHD (aGvHD) after allogeneic hematopoietic cell transplantation (allo-HCT) and to identify biomarkers with predictive and/or diagnostic value. In in vitro experiments, endothelial cells (ECs) were exposed to serum from patients with (aGvHD, n=31) and without (NoGvHD, n=13) aGvHD, to evaluate changes in surface adhesion receptors, the reactivity of the extracellular matrix by measuring the presence of Von Willebrand factor (VWF) and platelet adhesion, and the activation of intracellular signaling proteins...
June 26, 2017: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/28649180/procoagulatory-changes-induced-by-head-up-tilt-test-in-patients-with-syncope-observational-study
#7
Viktor Hamrefors, Artur Fedorowski, Karin Strandberg, Richard Sutton, Nazim Isma
BACKGROUND: Orthostatic hypercoagulability is proposed as a mechanism promoting cardiovascular and thromboembolic events after awakening and during prolonged orthostasis. We evaluated early changes in coagulation biomarkers induced by tilt testing among patients investigated for suspected syncope, aiming to test the hypothesis that orthostatic challenge evokes procoagulatory changes to a different degree according to diagnosis. METHODS: One-hundred-and-seventy-eight consecutive patients (age, 51 ± 21 years; 46% men) were analysed...
2017: Thrombosis Journal
https://www.readbyqxmd.com/read/28648867/an-initial-investigation-into-endothelial-cc-chemokine-expression-in-the-human-rheumatoid-synovium
#8
Lisa Rump, Derek L Mattey, Oksana Kehoe, Jim Middleton
Rheumatoid arthritis (RA) is a destructive and chronic autoimmune inflammatory disease. Synovial inflammation is a major feature of RA and is associated with leukocyte recruitment. Leukocytes cross the endothelial cells (ECs) into the synovial tissue and fluid and this migration is mediated via a range of chemokines and adhesion molecules on the ECs. As important mediators of leukocyte extravasation, a number of chemokines from each of the chemokine families have been established as expressed in the RA joint...
June 22, 2017: Cytokine
https://www.readbyqxmd.com/read/28648774/the-carmat-bioprosthetic-total-artificial-heart-is-associated-with-early-hemostatic-recovery-and-no-acquired-von-willebrand-syndrome-in-calves
#9
David M Smadja, Sophie Susen, Antoine Rauch, Bernard Cholley, Christian Latrémouille, Daniel Duveau, Luca Zilberstein, Denis Méléard, Marie-Fazia Boughenou, Eric Van Belle, Pascale Gaussem, Antoine Capel, Piet Jansen, Alain Carpentier
OBJECTIVES: To determine hemostasis perturbations, including von Willebrand factor (VWF) multimers, after implantation of a new bioprosthetic and pulsatile total artificial heart (TAH). DESIGN: Preclinical study SETTING: Single-center biosurgical research laboratory. PARTICIPANTS: Female Charolais calves, 2-to-6 months old, weighing 102-to-122 kg. INTERVENTIONS: Surgical implantation of TAH through a mid-sternotomy approach...
March 1, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28648306/cost-benefit-analysis-and-assessment-of-quality-of-care-in-patients-with-hemophilia-undergoing-treatment-at-national-rural-health-mission-in-maharashtra-india
#10
Priyanka Singh, Kanchan Mukherjee
BACKGROUND: Hemophilia is a genetic disorder with high health care burden. In India, most patients with hemophilia seek care through self-purchasing factor concentrate and incur huge out-of-pocket (OOP) expenditure. In March 2013, the government of India launched a pilot hematology program through the National Rural Health Mission for providing free treatment services to patients with hemophilia in the state of Maharashtra. OBJECTIVES: To estimate the benefit-cost ratio of the program from a patient perspective, to estimate reduction in OOP expenditure of the patients and their families, and to assess the quality of care delivered and the barriers to access care among patients with hemophilia...
May 2017: Value in Health Regional Issues
https://www.readbyqxmd.com/read/28645643/management-of-thrombotic-thrombocytopenic-purpura
#11
P Coppo
Daily therapeutic plasma exchange (TPE) transformed the historically fatal prognosis of acquired, anti-ADAMTS13 antibody-mediated thrombotic thrombocytopenic purpura (TTP), leading to the current overall survival rates of >80%. However, relapses occur in up to 40% of patients and refractory disease with fatal outcomes still occurs, typically within the first days of management. In this context, the introduction of rituximab has been the second major breakthrough in TTP management. Rituximab is now routinely recommended during the acute phase, typically in patients with a suboptimal response to treatment, and increasingly as frontline therapy, with high response rates in the following weeks...
June 20, 2017: Transfusion Clinique et Biologique: Journal de la Société Française de Transfusion Sanguine
https://www.readbyqxmd.com/read/28642239/a-novel-single-domain-antibody-against-von-willebrand-factor-a1-domain-resolves-leukocyte-recruitment-and-vascular-leakage-during-inflammation
#12
Gabriel Aymé, Frédéric Adam, Paulette Legendre, Amine Bazaa, Valérie Proulle, Cécile V Denis, Olivier D Christophe, Peter J Lenting
OBJECTIVE: von Willebrand factor (VWF) is crucial to hemostasis, but also plays a role in inflammatory processes. Unfortunately, no proper monoclonal antibodies to study VWF function in mice are currently available. We therefore aimed to generate single-domain antibodies (sdAbs) recognizing murine VWF and blocking its function in vivo. APPROACH AND RESULTS: Llama-derived sdAbs recognizing both human and murine VWF were isolated via phage display technology. One of them (designated KB-VWF-006) recognized the VWF A1 domain with picomolar affinity...
June 22, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28641568/an-expanding-role-of-biomarkers-in-pulmonary-arterial-hypertension
#13
Mustafa Yildiz, Alparslan Sahin, Michael Behnes, İbrahim Akin
BACKGROUND: Pulmonary arterial hypertension (PAH), is a chronic disease which may cause or result from mulitple cardiopulmonary disorders. The disease has complex pathophysiological mechanisms and involves many systematic, cellular and molecular changes. Therefore, it is crutial to find out underlying mechanisms and detect biomarkers to achieve early and proper diagnosis, evaluate of disease severity, for follow-up and monitor response to treatment. Many biomarker for PAH have been investigated but yet no such biomarker has been found specific and easily accessible to use for the patients...
June 14, 2017: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/28640903/type-2b-von-willebrand-disease-with-or-without-large-multimers-a-distinction-of-the-two-sides-of-the-disorder-is-long-overdue
#14
Alessandra Casonato, Viviana Daidone, Eva Galletta, Antonella Bertomoro
Most, but not all patients with type 2B von Willebrand disease (VWD)-which features gain-of-function mutations in the A1 domain of von Willebrand factor (VWF)-have no circulating large VWF multimers. Similarities and differences were analysed in 33 type 2B patients, 12 with a normal and 21 with an abnormal multimer pattern, to see whether they should be considered separately. The minimum aggregating dose of ristocetin was similarly reduced in both patient groups, and modulated by their underlying VWF mutations...
2017: PloS One
https://www.readbyqxmd.com/read/28639572/relation-of-biochemical-parameters-with-flow-mediated-dilatation-in-patients-with-metabolic-syndrome
#15
Nurver Turfaner Sipahioglu, Barıs Ilerigelen, Zeynep B Gungor, Gulsel Ayaz, Hakan Ekmekci, Cigdem Bayram Gurel, Gunay Can, Huseyin Sonmez, Turgut Ulutin, Fikret Sipahioglu
BACKGROUND: Metabolic syndrome (MetS) is one of the high cardiovascular (CV) situations. Endothelial dysfunction, which is a common finding in patients with MetS, is related with increased CV risk. In patients with MetS, the effect of the major CV risk factors, not included in the MetS definition, on endothelial dysfunction is not well known. The aim of this study was to determine the effect of major CV risk factors such as gender, smoking, family history, and biochemical parameters on endothelial dysfunction in patients with MetS...
July 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28636092/impact-of-diagnosis-of-von-willebrand-disease-on-patient-outcomes-analysis-of-medical-insurance-claims-data
#16
R F Sidonio, K M Haley, D Fallaize
The inherited bleeding disorder von Willebrand disease (VWD) is challenging to diagnose owing to disease heterogeneity, lack of a definitive laboratory test and variations in diagnostic criteria. We evaluated the impact of diagnosis and diagnostic delay on patient outcomes. The PharMetrics Plus Database was interrogated for medical claims for VWD (ICD-9 286.4) and bleeding events between 1 January 2006 and 30 June 2015. Longitudinal analysis was performed of patients newly diagnosed with VWD (≥9 months' continuous enrolment before first VWD claim) through 24 months following diagnosis...
June 21, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28634421/the-role-of-von-willebrand-factor-in-vascular-inflammation-from-pathogenesis-to-targeted-therapy
#17
REVIEW
Felice Gragnano, Simona Sperlongano, Enrica Golia, Francesco Natale, Renatomaria Bianchi, Mario Crisci, Fabio Fimiani, Ivana Pariggiano, Vincenzo Diana, Andreina Carbone, Arturo Cesaro, Claudia Concilio, Giuseppe Limongelli, Mariagiovanna Russo, Paolo Calabrò
Beyond its role in hemostasis, von Willebrand factor (VWF) is an emerging mediator of vascular inflammation. Recent studies highlight the involvement of VWF and its regulator, ADAMTS13, in mechanisms that underlie vascular inflammation and immunothrombosis, like leukocyte rolling, adhesion, and extravasation; vascular permeability; ischemia/reperfusion injury; complements activation; and NETosis. The VWF/ADAMTS13 axis is implicated in the pathogenesis of atherosclerosis, promoting plaque formation and inflammation through macrophage and neutrophil recruitment in inflamed lesions...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28633902/calcium-sensing-receptor-initiating-cystathionine-gamma-lyase-hydrogen-sulfide-pathway-to-inhibit-platelet-activation-in-hyperhomocysteinemia-rat
#18
Yuwen Wang, Ziqing Zhao, Sa Shi, Fei Gao, Jichao Wu, Shiyun Dong, Weihua Zhang, Yanhong Liu, Xin Zhong
Hyperhomocysteinemia (HHcy, high homocysteine) induces the injury of endothelial cells (ECs). Hydrogen sulfide (H2S) protects ECs and inhibits the activation of platelets. Calcium-sensing receptor (CaSR) regulates the production of endogenous H2S. However, whether CaSR inhibits the injury of ECs and the activation of platelets by regulating the endogenous cystathionine-gamma-lyase (CSE, a major enzyme that produces H2S)/H2S pathway in hyperhomocysteinemia has not been previously investigated. Here, we tested the ultrastructure alterations of ECs and platelets, the changes in the concentration of serum homocysteine and the parameters of blood of hyperhomocysteinemia rats were measured...
June 19, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28628948/platelet-hyperaggregability-is-associated-with-decreased-adamts13-activity-and-enhanced-endotoxemia-in-patients-with-acute-cholangitis
#19
Hiroaki Takaya, Hideto Kawaratani, Takuya Kubo, Kenichiro Seki, Yasuhiko Sawada, Kosuke Kaji, Yasushi Okura, Kosuke Takeda, Mitsuteru Kitade, Kei Moriya, Tadashi Namisaki, Akira Mitoro, Masanori Matsumoto, Hiroshi Fukui, Hitoshi Yoshiji
AIM: Insufficient ADAMTS13 activity (ADAMTS13:AC) leads to increased levels of unusually large von Willebrand factor (VWF) multimers and causes microcirculatory disturbance and multiple organ failure (MOF). Endotoxin (Et) triggers the activation of coagulation and cytokine cascades, leading to MOF in severe inflammatory response syndrome (SIRS). Here, we investigated the potential role of endotoxemia-related ADAMTS13 in acute cholangitis. METHODS: Twenty-four patients with acute cholangitis, including 7 with severe acute cholangitis, were recruited in this study...
June 19, 2017: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/28628220/importance-of-endothelial-dysfunction-biomarkers-in-patients-with-crimean-congo-hemorrhagic-fever
#20
Mustafa Arslan, Gürdal Yilmaz, Ahmet Mentese, Hülya Yilmaz, S Caner Karahan, Iftihar Koksal
BACKGROUND: The pathogenesis of the Crimean-Congo hemorrhagic fever (CCHF) and the cause of the hemorrhage are not yet fully understood. However, the endothelium plays a key role in the pathogenesis. The purpose of this study was to investigate endothelial dysfunction markers [asymmetrical dimethyl arginine(ADMA), endothelin 1(ET-1), thrombomodulin(TM), von Willebrand factor(vWf) and intercellular adhesion molecule(ICAM-1)] in serum in patients with CCHF and their associations with hemorrhage...
June 19, 2017: Journal of Medical Virology
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