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https://www.readbyqxmd.com/read/28427966/intravenous-immunoglobulin-for-treatment-of-severe-refractory-heparin-induced-thrombocytopenia
#1
Anand Padmanabhan, Curtis G Jones, Shannon M Pechauer, Brian R Curtis, Daniel W Bougie, Mehraboon S Irani, Barbara J Bryant, Jack B Alperin, Thomas G Deloughery, Kevin P Mulvey, Binod Dhakal, Renren Wen, Demin Wang, Richard H Aster
BACKGROUND: HIT complicated by severe thrombocytopenia and thrombosis can pose significant treatment challenges. Use of alternative anticoagulants in this setting may increase bleeding risks, especially in patients who have a protracted disease course. Additional therapies are lacking in this severely affected patient population. METHODS: We describe three HIT patients who had severe thromboembolism and prolonged thrombocytopenia refractory to standard treatment but achieved an immediate and sustained response to intravenous immunoglobulin G (IVIg) therapy...
April 17, 2017: Chest
https://www.readbyqxmd.com/read/28418908/plasma-protein-profiling-in-patients-undergoing-coronary-artery-bypass-grafting-surgery-and-clinical-significance
#2
Zhi-Peng Guo, Hai-Tao Hou, Rui Jing, Zhen-Guo Song, Xiao-Cheng Liu, Guo-Wei He
This study was designed to identify the protein profiling in patients with triple vessel coronary artery disease (CAD) undergoing CABG, in order to detect CAD-related differential proteins in these patients. CABG patients with triple vessel disease with/without left main stenosis (n =160) were compared to normal coronary angiographic subjects (n =160). Plasma samples of 20 males and 20 females in each group were analyzed with iTRAQ technique. ELISA test was used to test the chosen proteins from iTRAQ results in plasma samples from a new cohort of the CABG group (n=120, male/femal=61/59) and control (n =120, male/female=60/60)...
March 18, 2017: Oncotarget
https://www.readbyqxmd.com/read/28416511/heparin-induced-thrombocytopenia
#3
Gowthami M Arepally
Heparin-induced thrombocytopenia (HIT) is an immune complication of heparin therapy caused by antibodies to complexes of platelet factor 4 (PF4) and heparin. Pathogenic antibodies to PF4/heparin bind and activate cellular FcγRIIA on platelets and monocytes to propagate a hypercoagulable state culminating in life-threatening thrombosis. It is now recognized that anti-PF4/heparin antibodies develop commonly after heparin exposure, but only a subset of sensitized patients progress to life-threatening complications of thrombocytopenia and thrombosis...
April 17, 2017: Blood
https://www.readbyqxmd.com/read/28407821/-association-between-platelet-activating-factor-acetylhydrolase-gene-polymorphisms-and-gastrointestinal-bleeding-in-children-with-henoch-sch%C3%A3-nlein-purpura
#4
Bao-Xiang Wang, Hong Mei, Han-Ming Peng, Yuan Gao, Yan Ding
OBJECTIVE: To study the association between the single nucleotide polymorphisms (SNPs) of the ninth exon Val279Phe of platelet-activating factor acetylhydrolase (PAF-AH) gene and gastrointestinal bleeding in children with Henoch-Schönlein purpura (HSP). METHODS: A total 516 children with HSP were enrolled, among whom 182 had gastrointestinal bleeding and 334 had no gastrointestinal bleeding. PCR was used to investigate the distribution of genotypes and alleles in the SNPs of Val97Phe...
April 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28391124/performance-characteristics-of-an-automated-latex-immunoturbidimetric-assay-hemosil-%C3%A2-hit-ab-pf4-h-for-the-diagnosis-of-immune-heparin-induced-thrombocytopenia
#5
Theodore E Warkentin, Jo-Ann I Sheppard, Lori-Ann Linkins, Donald M Arnold, Ishac Nazy
BACKGROUND: Heparin-induced thrombocytopenia (HIT) is a prothrombotic drug reaction caused by platelet-activating anti-PF4/heparin antibodies. Given time-sensitive treatment considerations, a rapid and accurate laboratory test for HIT antibodies is needed. AIMS: To determine operating characteristics for the HemosIL(®) HIT-Ab(PF4/H), a rapid, on-demand, fully-automated, latex immunoturbidimetric assay (LIA), for diagnosis of HIT. METHODS: We evaluated LIA sensitivity, specificity, negative (NPV) and positive predictive value (PPV), negative (LR-) and positive likelihood ratio (LR+), using citrated-plasma from 429 patients (prospective cohort study of 4Ts scoring; HIT, n=31), and from consecutive HIT patients (n=125), using reference standard serotonin-release assay (SRA)...
March 11, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28384443/effect-of-platelet-derived-%C3%AE-thromboglobulins-on-coagulation
#6
Karl Egan, Johanna P van Geffen, Hui Ma, Barry Kevane, Aine Lennon, Seamus Allen, Elaine Neary, Martin Parsons, Patricia Maguire, Kieran Wynne, Richard O' Kennedy, Johan W M Heemskerk, Fionnuala Ní Áinle
BACKGROUND: β-thromboglobulins are derived from the cleavage of the CXC chemokine platelet basic protein and are released in high concentrations by activated platelets. Platelet-derived β-thromboglobulins (βTG) share 70% homology with platelet factor 4 (PF4), another CXC chemokine released by activated platelets. PF4 modulates coagulation by inhibiting heparin-antithrombin interactions, promoting protein C activation, and attenuating the activity of activated protein C. In contrast, the effect of βTG on coagulation is unknown...
March 30, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28374939/diagnostic-accuracy-of-igg-specific-versus-polyspecific-enzyme-linked-immunoassay-for-the-diagnosis-of-heparin-induced-thrombocytopenia-a-systematic-review-and-meta-analysis
#7
H D Husseinzadeh, P A Gimotty, A M Pishko, M Buckley, T E Warkentin, A Cuker
BACKGROUND: There is conflicting data on whether the IgG-specific or polyspecific anti-platelet factor 4/heparin (PF4/H) enzyme-linked immunosorbent assay (ELISA) is preferred for the laboratory diagnosis of heparin-induced thrombocytopenia (HIT). OBJECTIVES: To directly compare diagnostic accuracy of IgG- versus polyspecific ELISA in HIT. PATIENTS/METHODS: A systematic search yielded 9 studies comprised of 1,948 patients with suspected HIT tested by both IgG- and polyspecific ELISAs and a reference standard against which the diagnostic accuracy of the ELISAs could be measured...
April 4, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28369702/the-unique-immunological-features-of-heparin-induced-thrombocytopenia
#8
REVIEW
Phillip Staibano, Donald M Arnold, Dawn M E Bowdish, Ishac Nazy
Heparin-induced thrombocytopenia (HIT) is a serious drug reaction that leads to a decrease in platelet count and a high risk of thrombosis. HIT patients produce pathogenic immunoglobulin G (IgG) antibodies that bind to complexes of platelet factor-4 (PF4) and heparin. HIT immune complexes crosslink Fc-receptors resulting in platelet and monocyte activation. These events lead to the release of procoagulant chemokines and tissue factor, which together create an intensely prothrombotic state. HIT represents an atypical immune response because it has features of both T cell-dependent and T cell-independent mechanisms...
April 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/28360858/saponins-from-sanguisorba-officinalis-improve-hematopoiesis-by-promoting-survival-through-fak-and-erk1-2-activation-and-modulating-cytokine-production-in-bone-marrow
#9
Xin Chen, Bogang Li, Yue Gao, Jianxin Ji, Zhongliu Wu, Shuang Chen
Radix Sanguisorbae, the root of Sanguisorba officinalis L. is used as traditional Chinese medicine. In recent decades, it has been reported to be clinically effective against myelosuppression induced by chemotherapy and/ or radiotherapy. However, the underlining mechanism has not been well studied. In this work, we evaluated the hematopoietic effect of total saponins from S. officinalis L. on myelosuppressive mice induced by cyclophosphamide and by(60)Co-γ-irradiation and confirmed the therapeutic effect. Then, we found total saponins and their characteristic constituents Ziyuglycoside I and Ziyuglycoside II can inhibit apoptosis of TF-1 cells caused by cytokine deprivation, and promote survival of mouse bone marrow nuclear cells through focal adhesion kinase (FAK) and extracellular signal-regulated kinase 1/2 (Erk1/2) activation in vitro...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28346881/heparin-and-homogeneous-model-heparin-oligosaccharides-form-distinct-complexes-with-protamine-light-scattering-and-zeta-potential-analysis
#10
Cynthia D Sommers, Hongping Ye, Jian Liu, Robert J Linhardt, David A Keire
Large multimolecular complexes of heparin with positively charged proteins such as platelet factor 4 (PF4) or protamine can initiate immune responses associated with heparin use in patients, including the most significant adverse event, heparin-induced thrombocytopenia (HIT). Current evidence suggests that platelet-activating antibodies that recognize large multi-molecular complexes (300-700kDa) of PF4 bound to heparin cause HIT [1] and in very rare cases anti-protamine-heparin antibodies can induce thrombocytopenia [2]...
June 5, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28344423/anti-platelet-factor-4-heparin-antibody-plays-a-significant-role-in-progression-of-arterial-stiffness-among-hemodialysis-patients
#11
Chieh Kuo, Chiang-Chin Tsai, Chien-An Chen, Yueh-Feng Tsai, Yen-Hsun Chen
BACKGROUND: Arterial stiffness is a determinant of cardiovascular disease in end stage renal disease. Hemodialysis patients may develop anti-platelet factor 4/heparin antibody (PF4-H Ab) because of heparin treatment in dialysis. We tested whether PF4-H Ab was associated with progression of arterial stiffness in a 3-year follow-up. METHODS: We enrolled 74 hemodialysis patients and studied their clinical, biochemical and arterial stiffness measurement with brachial-ankle pulse wave velocity (baPWV) over 3 years...
March 2017: Acta Cardiologica Sinica
https://www.readbyqxmd.com/read/28302997/platelets-cellular-and-functional-characteristics-in-patients-with-atrial-fibrillation-a-comprehensive-meta-analysis-and-systematic-review
#12
Alexander Weymann, Sadeq Ali-Hasan-Al-Saegh, Anton Sabashnikov, Aron-Frederik Popov, Seyed Jalil Mirhosseini, Luis Nombela-Franco, Luca Testa, Mohammadreza Lotfaliani, Mohamed Zeriouh, Tong Liu, Hamidreza Dehghan, Senol Yavuz, Michel Pompeu Barros de Oliveira Sá, William L Baker, Jae-Sik Jang, Mengqi Gong, Umberto Benedetto, Pascal M Dohmen, Fabrizio D'Ascenzo, Abhishek J Deshmukh, Giuseppe Biondi-Zoccai, Hugh Calkins, Gregg W Stone, Integrated Meta-Analysis Of Cardiac Surgery And Cardiology-Group Imcsc-Group
BACKGROUND This systematic review with meta-analysis aimed to determine the strength of evidence for evaluating the association of platelet cellular and functional characteristics including platelet count (PC), MPV, platelet distribution width (PDW), platelet factor 4, beta thromboglobulin (BTG), and p-selectin with the occurrence of atrial fibrillation (AF) and consequent stroke. MATERIAL AND METHODS We conducted a meta-analysis of observational studies evaluating platelet characteristics in patients with paroxysmal, persistent and permanent atrial fibrillations...
March 17, 2017: Medical Science Monitor Basic Research
https://www.readbyqxmd.com/read/28296751/serum-platelet-factor-4-is-a-reliable-activity-parameter-in-adult-patients-with-inflammatory-bowel-disease-a-pilot-study
#13
Lei Ye, Yu-Ping Zhang, Na Yu, Ya-Xu Jia, Shu-Jun Wan, Fang-Yu Wang
To investigate the diagnostic utility of serum platelet factor 4 (PF4) levels and to assess its accuracy in detecting inflammatory bowel disease activity.This study included 45 patients with ulcerative colitis (UC), 45 patients with Crohn disease (CD), and 30 control subjects at Jinling Hospital between May 2014 and July 2015. Laboratory tests measured white blood count, C-reactive protein, erythrocyte sedimentation rate, and platelet count. PF4 was examined by enzyme-linked immunosorbent assays. Patients were divided into 2 groups according to disease activity: active and inactive...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28287032/new-platelet-functional-method-for-identification-of-pathogenic-antibodies-in-hit-patients
#14
M L Guarino, I Massimi, S Mardente, A Lappa, S Donfrancesco, G P Visentin, F M Pulcinelli
Heparin-induced thrombocytopenia (HIT) is a thrombotic complication of heparin therapy. The most used functional method for HIT diagnosis is serotonin release assay (SRA). A different functional method based on ATP release with luciferin/luciferase long-life and stable luminescent signal is used here, which is shown to be comparable for accuracy with SRA in both negative (patients 4Ts ≤3, and negative for both anti-PF4/heparin immunoassay and SRA) and positive (4Ts >3, and positive for both PF4/heparin antibodies and SRA) patients...
March 13, 2017: Platelets
https://www.readbyqxmd.com/read/28271738/profile-of-instrumentation-laboratory-s-hemosil%C3%A2-acustar-hit-ab-pf4-h-assay-for-diagnosis-of-heparin-induced-thrombocytopenia
#15
Michael Nagler, Adam Cuker
Immunoassays play an essential role in the diagnosis of heparin-induced thrombocytopenia (HIT). The objective of this article is to review HemosIL® AcuStar HIT-Ab(PF4-H) (Instrumentation Laboratory, Bedford, MA, USA), a new chemiluminescent immunoassay for HIT. Areas covered: The authors searched the published literature for evaluation studies of HemosIL® AcuStar HIT-Ab(PF4-H) and sought information from the manufacturer. In this paper, the authors discuss the analytical principle and technical aspects of the assay; describe its diagnostic performance in validation studies; report on its reproducibility, cost-effectiveness, and regulatory status; and discuss the implications of the assay on clinical practice and means of integrating it in diagnostic pathways...
March 16, 2017: Expert Review of Molecular Diagnostics
https://www.readbyqxmd.com/read/28267395/the-role-of-platelets-in-antiphospholipid-syndrome
#16
G Baroni, A Banzato, E Bison, G Denas, G Zoppellaro, V Pengo
Despite extensive research, the pathogenesis of antiphospholipid syndrome (APS) remains obscure in many aspects. However, it is widely accepted that thrombosis is the result of a hypercoagulable state caused by antibodies directed against β2-glycoprotein I (β2-GPI), a protein whose physiological role is unknown. Although underestimated, platelets may be involved in APS and its thrombotic manifestations, especially arterial, in several ways. Thrombocytopenia is the most relevant non-criteria manifestation of APS, possibly caused by direct binding of anti-β2-GPI antibodies or anti-β2-GPI-β2-GPI complexes...
March 7, 2017: Platelets
https://www.readbyqxmd.com/read/28256034/platelet-factor-4-upregulates-matrix-metalloproteinase-1-production-in-gingival-fibroblasts
#17
M Javaid, J Bi, C Biddle, C M Tsai, L Häkkinen, H Kim
BACKGROUND AND OBJECTIVE: Periodontitis is a highly prevalent chronic inflammatory disease that causes tooth loss, morbidity and confers an increased risk for systemic disease. Tissue destruction during periodontitis is due in large part to collagen-degrading matrix metalloproteinases (MMPs) released by resident cells of the periodontium in response to proinflammatory cytokines. Platelets are immune-competent blood cells with a newly recognized role in chronic inflammation; however, their role in the pathogenesis of periodontitis is undefined...
March 2, 2017: Journal of Periodontal Research
https://www.readbyqxmd.com/read/28207794/protected-graft-copolymer-formulated-fibroblast-growth-factors-mitigate-the-lethality-of-partial-body-irradiation-injury
#18
Gerardo M Castillo, Akiko Nishimoto-Ashfield, Cynthia C Jones, Kasim K Kabirov, Alexander Zakharov, Alexander V Lyubimov
We evaluated the mitigating effects of fibroblast growth factor 4 and 7 (FGF4 and FGF7, respectively) in comparison with long acting protected graft copolymer (PGC)-formulated FGF4 and 7 (PF4 and PF7, respectively) administered to C57BL/6J mice a day after exposure to LD50/30 (15.7 Gy) partial body irradiation (PBI) which targeted the gastrointestinal (GI) system. The PGC that we developed increased the bioavailability of FGF4 and FGF7 by 5- and 250-fold compared to without PGC, respectively, and also sustained a 24 hr presence in the blood after a single subcutaneous administration...
2017: PloS One
https://www.readbyqxmd.com/read/28185978/long-term-serial-changes-in-platelet-activation-indices-following-sirolimus-elution-and-bare-metal-stent-implantation-in-patients-with-stable-coronary-artery-disease
#19
Maria Marketou, George E Kochiadakis, Aikaterini Giaouzaki, Katerini Sfiridaki, Stelios Petousis, Fragiskos Maragoudakis, Konstantinos Roufas, Despoina Vougia, John Logakis, Gregory Chlouverakis, Panos E Vardas
BACKGROUND: Platelet activation is crucial in the development of stent thrombosis following percutaneous coronary intervention (PCI). We carried out a long-term assessment of multiple factors implicated in the thrombotic process and monitored markers of platelet activation after the implantation of sirolimus-eluting stents (SES) in patients with stable coronary artery disease (CAD). Additionally, we compared these findings with those after bare-metal stent (BMS) implantation. METHODS: A cohort of 47 consecutive patients, aged <70 years, with severe stenosis (>70% narrowing of the lumen) of one major epicardial coronary artery and stable CAD underwent successful elective PCI...
February 6, 2017: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
https://www.readbyqxmd.com/read/28167447/associations-between-ambient-wood-smoke-and-other-particulate-pollutants-and-biomarkers-of-systemic-inflammation-coagulation-and-thrombosis-in-cardiac-patients
#20
Daniel P Croft, Scott J Cameron, Craig N Morrell, Charles J Lowenstein, Frederick Ling, Wojciech Zareba, Philip K Hopke, Mark J Utell, Sally W Thurston, Kelly Thevenet-Morrison, Kristin A Evans, David Chalupa, David Q Rich
BACKGROUND: Increased particulate air pollution has been associated with both an increased risk of myocardial infarction (MI) and adverse changes in cardiac biomarkers. Up to 30% of ambient wintertime fine particles (PM2.5) in Rochester, NY are from wood burning. Our study examined associations between ambient levels of a marker of wood smoke (Delta-C) and other particulate air pollutants and biomarkers of inflammation, coagulation and thrombosis. METHODS: We measured blood concentrations of C-reactive protein (CRP), D-dimer, fibrinogen, P-selectin, platelet factor 4 (PF-4), von Willebrand factor (vWF), and myeloperoxidase (MPO) of 135 patients undergoing cardiac catheterization during the winters of 2011-2013...
April 2017: Environmental Research
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