Abstract:
:Clinical and epidemiological trials often involve central laboratory analyses of coagulation tests, including fibrinogen, which requires freezing of the plasma samples. Although rapid freezing by immersion of sample tubes in liquid nitrogen and storage at -70 degrees C is recommended, plasma samples are often transferred directly to the storage compartments, and stored at -20 degrees C. Prothrombin time (PT), activated partial thromboplastin time (aPTT), and fibrinogen using a kinetic fibrinogen assay, PT-derived fibrinogen, and an immunoassay were measured in fresh plasma samples from 16 healthy blood donors. In addition, four sets of aliquots were prepared. Set A was transferred directly to a -20 degrees C storage compartment, set B was first snap-frozen in liquid nitrogen and then transferred to the -20 degrees C compartment. Set C was transferred directly to a -70 degrees C freezer, set D was first snap-frozen in liquid nitrogen and then stored at -70 degrees C. Aliquots were thawed after one, two, three and four months storage and laboratory assays repeated. PT and aPTT were strongly influenced by freezing and storage. In contrast, freezing had little effect on fibrinogen levels. Differences were below three percent for all variants. Changes were smaller for samples stored at -70 degrees C compared to -20 degrees C, and for snap-frozen compared to not snap-frozen samples. Frozen and thawed samples generated slightly higher fibrinogen levels compared to fresh samples. Prothrombin time and aPTT should be measured in fresh samples, since freezing has an inconstant and unpredictable effect on the results. In contrast, freezing and storage has little effect on results of fibrinogen assays. A limitation of the study is that only samples from healthy blood donors were used. Plasma samples with abnormal fibrinogen concentration, or with abnormal concentrations of coagulation factors might behave differently.
journal_name
Thromb Resjournal_title
Thrombosis researchauthors
Alesci S,Borggrefe M,Dempfle CEdoi
10.1016/j.thromres.2008.11.010subject
Has Abstractpub_date
2009-05-01 00:00:00pages
121-6issue
1eissn
0049-3848issn
1879-2472pii
S0049-3848(08)00537-9journal_volume
124pub_type
杂志文章abstract::Von Willebrand Factor is a multimer produced by endothelial cells and megakaryocytes, being stored in intracellular organelles, such as the Weibel-Palade bodies and alpha-granules in endothelial cells and platelets, respectively. This molecule acts as a carrier protein for factor VIIIc, involved in the intrinsic pathw...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/s0049-3848(99)00122-x
更新日期:2000-01-15 00:00:00
abstract:INTRODUCTION:Incidence and risk factors of venous thromboembolism (VTE) are well established in surgical and medical settings, but data in psychiatric units are lacking. The aim of this study was to estimate the incidence of VTE in hospitalized psychiatric patients, and to assess the risk factors for VTE in this specif...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2012.10.002
更新日期:2012-12-01 00:00:00
abstract::Forty women undergoing surgery under general anaesthesia for hyperplasia mammae were randomized to treatment with low dose heparin (5000 IU twice daily) or not. Preoperatively, and repeated on the 3. postoperative day, assays of euglobulin clot lysis time (ELT) after venous stasis, tissue plasminogen activator (t-PA) ...
journal_title:Thrombosis research
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/0049-3848(87)90318-5
更新日期:1987-03-01 00:00:00
abstract:INTRODUCTION:Aging and renal impairment may prolong the half-life and lead to accumulation of low molecular weight heparins. Correct dosing is critical to prevent bleeding or thrombosis. MATERIALS AND METHODS:Open, parallel study. Healthy adult [n=13] and elderly (>65yrs) [n=12] volunteers; and subjects with mild (ClC...
journal_title:Thrombosis research
pub_type: 杂志文章,多中心研究
doi:10.1016/j.thromres.2014.03.038
更新日期:2014-06-01 00:00:00
abstract:INTRODUCTION:The activated partial thromboplastin time (APTT) is commonly used to monitor unfractionated heparin (UFH) but may not accurately measure the amount of heparin present. The anti-Xa assay is less susceptible to confounding factors and may be a better assay for this purpose. MATERIALS AND METHODS:The validit...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2017.07.006
更新日期:2017-09-01 00:00:00
abstract::Envenomation caused by Lonomia obliqua caterpillars is an increasing problem in Southern Brazil. The clinical profile is characterized by a profound hemorrhagic disorder. In the present study, we describe the characterization of a fibrin(ogen)olytic factor (lonofibrase) isolated from a venomous secretion of the caterp...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2004.01.012
更新日期:2004-01-01 00:00:00
abstract::Heparanase is an endo-beta-D-glucuronidase capable of cleaving heparan sulfate (HS) side chains of heparan sulfate proteoglycans (HSPG) on cell surfaces and the extracellular matrix, activity that is strongly implicated in tumor metastasis and angiogenesis. Evidence was provided that heparanase over-expression in canc...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/S0049-3848(10)70018-9
更新日期:2010-04-01 00:00:00
abstract::Two functional assays for protein C inhibitor (PCI) were evaluated in parallel for the same plasma samples. One assay is specific for active PCI and measures its ability to form complexes with activated protein C (APC) in the presence of heparin (España et al, Thromb Res 64, 309, 1991) (Method A). After incubation of ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(93)90079-4
更新日期:1993-06-01 00:00:00
abstract::Anticoagulant properties of three sulfated compounds prepared from xylans isolated from corn cobs, larchwood and oatspelts were compared with heparin and sodium pentosan polysulfate (SP-54) by studying their effects on activated partial thromboplastin time (APTT), prothrombin time (PT) and thrombin time (TT) using poo...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(87)90148-4
更新日期:1987-08-01 00:00:00
abstract::Thrombus formation was electrically induced in the left common carotid artery of rats with preoccluded both vertebral and right carotid arteries. Following thrombus induction, animals became unresponsive and lost their righting reflex. The loss of righting reflex was observed when cortical tissular pO2 reached 55 +/- ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(87)90340-9
更新日期:1987-10-01 00:00:00
abstract:INTRODUCTION:Inter-individual variability in clopidogrel responsiveness is dependent on genetic polymorphisms. We aimed to investigate the impact of 3 genetic polymorphisms involved in clopidogrel metabolism on a strategy of dose-adjustment according to platelet reactivity (PR) monitoring. MATERIAL AND METHODS:[correc...
journal_title:Thrombosis research
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1016/j.thromres.2011.12.038
更新日期:2012-07-01 00:00:00
abstract::Using the standard turbidimetric method of platelet aggregation and quantitation of platelet secretion with 14C-Serotonin, we have examined the responsiveness of the platelets of mongrel dogs to arachidonic acid (AA), and the thromboxane agonist U46619 in the presence and absence of a subthreshold concentration of epi...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(89)90300-9
更新日期:1989-09-15 00:00:00
abstract::There is now compelling evidence that use of oral contraceptives and postmenopausal hormonal therapies containing various estrogens is associated with a weak, but clinically relevant risk of both arterial and venous thrombosis. The increased risk is related to type and dose of both estrogen and combined progestagen an...
journal_title:Thrombosis research
pub_type: 杂志文章,评审
doi:10.1016/S0049-3848(13)70009-4
更新日期:2013-01-01 00:00:00
abstract:BACKGROUND:Immune thrombocytopenia (ITP) is an immune-mediated bleeding disorder in children. Activated T cells have been shown to play important roles in ITP. The aims of this study were to evaluate whether these T cell activation markers could be used as indicators to differentiate ITP patients from controls, and to ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2019.05.010
更新日期:2019-08-01 00:00:00
abstract:BACKGROUND:In patients who are receiving warfarin therapy and require cataract surgery, it may be possible to continue warfarin in the perioperative period but the safety of this management strategy has not been systematically evaluated. METHODS:We performed a systematic review of the literature to assess the safety (...
journal_title:Thrombosis research
pub_type: 杂志文章,meta分析,评审
doi:10.1016/j.thromres.2009.01.007
更新日期:2009-07-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:According to US Food and Drugs Administration (FDA), 2 hour recombinant tissue plasminogen activator (rt-PA) 100mg infusion is recommended for eligible patients with acute pulmonary embolism (PE). However,there exists evidence implying that a lower dosage of rt-PA can be equally effective but p...
journal_title:Thrombosis research
pub_type: 杂志文章,meta分析,评审
doi:10.1016/j.thromres.2013.12.026
更新日期:2014-03-01 00:00:00
abstract::The thrombin inhibitory role of antithrombin III (ATIII) and heparin cofactor II (HCII) was studied in vitro using intact and injured rabbit aortae. When intact vessels were loaded with thrombin and then exposed to either heat defibrinogenated human plasma (HDHP) or ATIII the same degree of thrombin inhibition was ach...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(91)90014-n
更新日期:1991-06-01 00:00:00
abstract:PURPOSE:The study sought to synthesize anionic peptide-conjugated tissue plasminogen activator (tPA) for its targeted/triggered delivery, where tPA's activity would be masked in the circulation and regenerated at the thrombus site by a commonly used anticoagulant, heparin, to minimize tPA associated bleeding complicati...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2012.11.030
更新日期:2013-03-01 00:00:00
abstract:INTRODUCTION:Pulmonary embolism (PE) has a high morbidity and mortality. Hence it is important to recognize factors associated with higher risk of adverse outcomes in hemodynamically stable patients. Heart-type fatty acid binding protein (H-FABP) is a novel marker evaluated in recent years for prognosis in acute PE. Ou...
journal_title:Thrombosis research
pub_type: 杂志文章,meta分析
doi:10.1016/j.thromres.2014.10.007
更新日期:2015-01-01 00:00:00
abstract::The enzymatic activities of uPA, and a collagenase-like proteinase in the post-nuclear fraction of cell homogenates of a metastatic carcinomatous cell line following X-ray irradiation were examined by the use of chromogenic substrates and by casein- or gelatin-containing zymographies and electrophoretic gel stained wi...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(94)90214-3
更新日期:1994-06-15 00:00:00
abstract::A significantly higher platelet malondialdehyde-like material (MDA--LM) content after physical and N-ethylmaleimide (NEM) stimulation is found in chronic ischemic heart disease (CHD) patients when compared to the control group. In subjects under aspirin treatment "in vivo" (1 gr/day) no difference is found between CHD...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(82)90305-x
更新日期:1982-09-01 00:00:00
abstract::The incidence of thrombotic events is higher in neonates compared to children of other age groups. Perinatal and maternal risk factors, as well as the developing neonatal hemostatic system, are contributing factors in the higher rate of thrombosis in this pediatric population. This review summarizes the available lite...
journal_title:Thrombosis research
pub_type: 杂志文章,评审
doi:10.1016/j.thromres.2010.10.009
更新日期:2010-12-01 00:00:00
abstract::Incubation of platelets with pronase or chymotrypsin results in the exposure of fibrinogen receptors. We determined that these enzymes did not affect the membrane fluidity as evaluated by the depolarization of the fluorescence of 1,6-diphenyl-1,3,5 hexatriene (DPH). There was no significant difference in either the de...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(85)90124-0
更新日期:1985-07-01 00:00:00
abstract:BACKGROUND:Predictors of venous thromboembolism (VTE) after trauma are uncertain. OBJECTIVE:To identify independent predictors of VTE after acute trauma. METHODS:Using Rochester Epidemiology Project (REP) resources, we identified all Olmsted County, MN residents with objectively-diagnosed incident VTE within 92days a...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2016.03.026
更新日期:2016-08-01 00:00:00
abstract::Patients with the nephrotic syndrome are at increased risk of developing venous and arterial thromboembolism, the most common of which is renal vein thrombosis. There are several unanswered or controversial issues relating to the nephrotic syndrome and thromboembolism, which include the mechanism of thromboembolism, a...
journal_title:Thrombosis research
pub_type: 杂志文章,评审
doi:10.1016/j.thromres.2005.03.030
更新日期:2006-01-01 00:00:00
abstract::Four murine monoclonal antibodies against rat platelets were produced by fusion of spleen cells from mice intravenously immunized with whole rat platelets. All four antibodies immunoprecipitated two major platelet membrane proteins with apparent molecular weights of 130,000 and 82,000 (nonreduced) and of 120,000 and 9...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(90)90118-v
更新日期:1990-09-15 00:00:00
abstract:INTRODUCTION:Thrombotic storm (TS) presents as a severe, acute thrombotic phenotype, characterized by multiple clotting events and frequently affecting younger adults. Understanding the extensive hypercoagulation of an extreme phenotype as TS will also provide insight into the pathogenesis of a wider spectrum of thromb...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2017.11.016
更新日期:2018-01-01 00:00:00
abstract::Activation of plasma plasminogen to plasmin is the objective of current strategies for thrombolytic therapy. Although thrombolytic activity in blood involves a large cellular component as well as that in plasma, the contribution of this cellular phase to clinical thrombolysis has not been examined. Using a 125I-fibrin...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(90)90128-y
更新日期:1990-07-15 00:00:00
abstract:INTRODUCTION:Extracellular histones are reported to increase thrombin generation in the plasma and induce endothelial cell death in vitro. These effects of histones were suggested to involve histone-induced inhibition of TM-dependent activated protein C (APC) generation. Therefore, we hypothesized that TM alfa, a recom...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2017.10.019
更新日期:2017-12-01 00:00:00
abstract:BACKGROUND:Brain tumor patients have an increased risk of venous thromboembolism (VTE). An important role in cancer-related VTE has been suggested for tissue factor (TF), the main initiator of the coagulation cascade. We conducted a prospective cohort study to determine whether expression levels of TF in brain tumors a...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2012.09.020
更新日期:2013-02-01 00:00:00