Abstract:
:The pharmacokinetics of heparin differ markedly from those of its fractions both in man and in experimental animal models. The route of administration determines the relative availability of different molecular species that exert the anti-Xa, anti-IIa, fibrinopeptide A generation inhibiting actions and the release of tissue plasminogen activator-like activity from the endothelial cell lining. The bioavailability of heparin fractions has proved to be much greater than heparin after subcutaneous or intraperitoneal administration. Most of the low molecular weight heparin fractions exhibit sustained antiprotease and antithrombotic actions. The pharmacokinetics of the specific anti-IIa and anti-Xa actions of heparin and its fractions is dependent on the molecular composition of these agents. Even if the fractions are standardized for identical potencies by the in vitro assays, the elimination rate of anti-Xa and anti-IIa actions are significantly different for each fraction. The antithrombotic actions of heparin and its fractions also vary widely in the rabbit stasis thrombosis model. Different fractions show variable antithrombotic actions against defined thrombogenic challenges. Moreover, selection and potency of a thrombogenic agent is of crucial importance in these studies. The primate (Macaca mulatta) model offers a useful preclinical model for the pharmacologic evaluation of the low molecular heparin fractions. Since the coagulation system and heparinizability index of this model approximate a human response, the data may be used to reflect therapeutic and prophylactic responses, as well as to assess toxic effects, such as bleeding.
journal_name
Semin Thromb Hemostjournal_title
Seminars in thrombosis and hemostasisauthors
Fareed J,Walenga JM,Williamson K,Emanuele RM,Kumar A,Hoppensteadt DAdoi
10.1055/s-2007-1004360subject
Has Abstractpub_date
1985-01-01 00:00:00pages
56-74issue
1eissn
0094-6176issn
1098-9064journal_volume
11pub_type
杂志文章,评审abstract::This report describes the first two Japanese cases of AIDS developed in patients with hemophilia. One was a 48-year-old man with hemophilia B and the other was a 62-year-old patient with hemophilia A. They had nonspecific prodromal syndromes of AIDS initially, and later developed fatal opportunistic infections with Ca...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章
doi:10.1055/s-2007-1004393
更新日期:1985-10-01 00:00:00
abstract::Thrombophilia can be defined as an increased tendency to thrombosis. There are several defined risk factors for thrombosis, and these are generally separated into acquired and congenital factors. Congenital risk factors include deficiencies or defects in natural anticoagulants, such as antithrombin, protein C and prot...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章
doi:10.1055/s-2005-863800
更新日期:2005-02-01 00:00:00
abstract::Thrombophilia includes multiple inherited and acquired risk factors that determine a shift in the balance of procoagulant and anticoagulant factors promoting hypercoagulability, which is associated with an increased risk of venous thromboembolism (VTE). VTE is characterized by more common clinical manifestations, such...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-2007-985754
更新日期:2007-09-01 00:00:00
abstract::Several studies have suggested that patients with non-O blood group have an increased risk of both venous and arterial thromboembolic events. On the contrary, the role of ABO blood group on the risk of bleeding complications remains unclear. Thus, we performed a meta-analysis of the literature with the aim of assessin...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,meta分析,评审
doi:10.1055/s-0032-1329550
更新日期:2013-02-01 00:00:00
abstract::Available data suggest that elevated triglyceride levels in plasma, associated with increased VLDL or chylomicron remnants, are associated with premature coronary artery atherosclerosis. Whether this is a direct effect or as a result of the association of hypertriglyceridemia with decreased HDL as well as decreased LD...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-2007-1002768
更新日期:1988-04-01 00:00:00
abstract::Non-Shiga toxin-associated hemolytic uremic syndrome (atypical HUS) is a rare form of thrombotic microangiopathy that associates hemolytic anemia, thrombocytopenia, and acute renal failure. The disease has been demonstrated to be linked with a complement alternative pathway dysregulation due to genetic defects but als...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-0030-1262885
更新日期:2010-09-01 00:00:00
abstract::A new in vitro system for the detection of platelet dysfunction, PFA-100, has been developed. It provides a quantitative measure of platelet function in anticoagulated whole blood. The system comprises a microprocessor-controlled instrument and a disposable test cartridge containing a biologically active membrane. The...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章
doi:10.1055/s-0032-1313612
更新日期:1995-01-01 00:00:00
abstract::A simple RIA method for B beta 15-42 RPs has been evaluated in our laboratory to investigate experimental and clinical fibrinolytic states. The assay utilizes bentonite precipitation to remove cross-reacting fibrinogen. Due to the heterogeneity in molecular weights of the B beta RPs, the results are expressed as nanog...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章
doi:10.1055/s-2007-1004430
更新日期:1984-10-01 00:00:00
abstract::To elucidate the mechanisms by which hematopoietic progenitor cells selectively lodge in bone marrow, we established endothelial cell lines derived from bone marrow and lung and then examined the transendothelial migration of hematopoietic progenitor cells by using cells was examined by a Transwell migration assay. He...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章
doi:10.1055/s-2007-995854
更新日期:1998-01-01 00:00:00
abstract::Patients undergoing surgery for malignancy are at increased risk of initial and recurrent venous thromboembolism (VTE). Several factors have been found to increase the risk of deep vein thrombosis (DVT) in cancer patients both during the first days after the operation and after discharge from hospital. Although, in ge...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-2002-36701
更新日期:2002-12-01 00:00:00
abstract::The quiescent vascular system in the adult body represents the imbalanced net outcome of overproduction of endogenous angiogenesis inhibitors and reduced levels of angiogenic factors. While some endogenous inhibitors are expressed under physiological conditions, they can also be generated in association with tumor gro...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-2004-822973
更新日期:2004-02-01 00:00:00
abstract::The catastrophic variant of the antiphospholipid syndrome (APS) is a condition characterized by multiple vascular occlusive events, usually affecting small vessels and evolving over a short period of time, together with laboratory confirmation of the presence of antiphospholipid antibodies. The pathogenesis of catastr...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-0028-1082274
更新日期:2008-04-01 00:00:00
abstract::D-dimer is the biochemical gold standard for diagnosing a variety of thrombotic disorders, but result reporting is heterogeneous in clinical laboratories. A specific five-item questionnaire was developed to gain a clear picture of the current standardization of D-dimer test results. The questionnaire was opened online...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章
doi:10.1055/s-0035-1549092
更新日期:2015-04-01 00:00:00
abstract::Clotting activation occurs frequently in cancer. Tissue factor (TF), the most potent initiator of coagulation, is expressed aberrantly in many types of malignancy and is involved not only in tumor-associated hypercoagulability but also in promoting tumor angiogenesis and metastasis via coagulation-dependent and coagul...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-2007-991531
更新日期:2007-10-01 00:00:00
abstract::There is a persuasive body of evidence suggesting that tissue factor (TF) is a major determinant of tumor progression. In addition to its "traditional" function as the initiator of hemostasis, TF may support tumor progression through signaling mechanisms involving either direct signal transduction through the TF cytop...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-2008-1079255
更新日期:2008-03-01 00:00:00
abstract::Epidemiological and laboratory studies performed in the last decades have changed our understanding of coagulopathy in cirrhosis, from a condition at increased risk of hemorrhagic events to one at higher thrombotic risk. However, it is not clear whether the decrease in factors that promote (except factor [F] VIII) ver...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章
doi:10.1055/s-0040-1715102
更新日期:2020-09-01 00:00:00
abstract:: ...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 社论,历史文章
doi:10.1055/s-0038-1677460
更新日期:2019-02-01 00:00:00
abstract::Neonatal hemostasis differs qualitatively, but in particular quantitatively, from hemostasis in older children and adults. Nevertheless, hemostasis in healthy neonates is functionally stable with no tendency to bleeding or thrombotic complications. In sick neonates, however, risk factors may disrupt this equilibrium a...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章
doi:10.1055/s-0036-1592299
更新日期:2016-10-01 00:00:00
abstract::In order to obtain a global assessment of circulating clopidogrel-related products and of the excretion of the drug, the pharmacokinetic behavior and the excretion balance of 14C radioactivity following the administration of a single dose of 75 mg of 14C-labeled clopidogrel were compared in 6 clopidogrel-free healthy ...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 临床试验,杂志文章
doi:
更新日期:1999-01-01 00:00:00
abstract::Systolic heart failure is a common syndrome whose incidence is expected to increase. Several treatment modalities, such as beta-blockers and angiotensin-converting enzyme inhibitors, improve survival. Whether antithrombotic treatment is effective remains to be elucidated, although observations suggest a prothrombotic ...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-0029-1234145
更新日期:2009-07-01 00:00:00
abstract::Molecular linkages between von Willebrand factor (VWF) and the alternative complement pathway (AP) have recently been discovered. Endothelial cell (EC)-anchored ultra-large (UL) VWF multimeric strings function as an activating surface for the AP. C3 (in active C3b form) binds to the EC-anchored ULVWF strings, and prom...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-0034-1383547
更新日期:2014-07-01 00:00:00
abstract::Heparanase is an endo-β-glucuronidase that enzymatically cleaves heparan sulfates (HS) and heparan sulfate proteoglycan (HSPG) structures. Heparanase expression levels by tumors were correlated with cell invasion, angiogenic activity, and poor prognosis. Heparanase can also possess pro-tumorigenic effects independent ...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章
doi:10.1055/s-0035-1544229
更新日期:2015-03-01 00:00:00
abstract::Statins are approved by the Food and Drug Administration (FDA) for the treatment of hypercholesterolemia and have shown remarkable activity in preventing cardiovascular morbidity and mortality. The versatility of statins is increasingly being appreciated, however, and lowering cholesterol is only one attribute among m...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-2003-40964
更新日期:2003-06-01 00:00:00
abstract::Endothelial cells secrete von Willebrand factor (vWF) multimers that are larger than those found in the circulating plasma. These very large multimeric forms of vWF, capable of spontaneously binding to and agglutinating the blood platelets under conditions of high fluid shear rate, are degraded by a specific metallopr...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-2002-27819
更新日期:2002-04-01 00:00:00
abstract::Quiescent pulmonary endothelium establishes an antithrombotic, anti-inflammatory surface that promotes blood flow. However, the endothelium rapidly responds to injury and inflammation by promoting thrombosis and enabling the directed transmigration of inflammatory cells, such as neutrophils, into the alveolar airspace...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-0030-1253452
更新日期:2010-04-01 00:00:00
abstract::Thrombocytosis is frequently (10 to 57%) observed in cancer patients. Although the mechanisms underlying thrombocytosis are not yet fully elucidated, tumor-derived factors with thrombopoietin-like activity, growth factors, platelet-derived microparticles, and factors released from bone marrow endothelial cells as well...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-2007-991540
更新日期:2007-10-01 00:00:00
abstract::Life expectancy for persons with hemophilia (PWH) has considerably increased in the last decades as a direct result of the availability of modern therapies to control the clotting defect. Because their life expectancy now matches that of the general population, PWH are experiencing age-related comorbidities, such as, ...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-0033-1354424
更新日期:2013-10-01 00:00:00
abstract::Point-of-care (POC) testing in hemostasis has experienced a significant increase in the spectrum of available tests and the number of tests performed. Short turn-around time and observation of rapid changes in test results are facilitated. The quality control process in POC testing must encompass a preanalytic (collec...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-0035-1544184
更新日期:2015-02-01 00:00:00
abstract::The number of hip fractures in anticoagulated patients is predicted to increase, due to people living longer. However, evidence regarding urgent perioperative management of elderly patients with hip fracture who take oral anticoagulants (vitamin K antagonists or direct oral anticoagulants) is scarce. In this article, ...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-0039-1678718
更新日期:2019-03-01 00:00:00
abstract::Type 2B von Willebrand disease (VWD2B) is a rare, autosomal-dominant inherited bleeding disorder, characterized by an enhanced ristocetin-induced platelet aggregation in platelet-rich plasma and often with variable degree of thrombocytopenia and loss of high-molecular-weight multimers von Willebrand factor (VWF). All ...
journal_title:Seminars in thrombosis and hemostasis
pub_type: 杂志文章,评审
doi:10.1055/s-0036-1579638
更新日期:2016-07-01 00:00:00