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Topic: Coagulation system

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	Coagulation - Wikipedia, the free encyclopedia
		Contrary to popular belief, coagulation from a cut on the skin is not initiated by air or drying out, but by platelets adhering to and activated by collagen in the blood vessel endothelium.
		Coagulation factors are generally indicated by Roman numerals, with a lowercase a appended to indicate an active form, ultimately resulting in cross-linked fibrin.
		Following activation by the contact factor or tissue factor pathways the coagulation cascade is maintained in a prothrombotic state by the continued activation of FVIII and FIX to form the tenase complex, until it is down regulated by the anticoagulant pathways.
	en.wikipedia.org /wiki/Coagulation (2350 words)

	eMedicine - Disseminated Intravascular Coagulation : Article by Marcel Levi, MD, PhD
		DIC is characterized by a systemic activation of the blood coagulation system, which results in the generation and deposition of fibrin, leading to microvascular thrombi in various organs and contributing to the development of multiorgan failure.
		Coagulation factor concentrates, such as prothrombin complex concentrate, will overcome this obstacle, but these compounds lack essential factors, such as factor V. Moreover, in older literature caution is advocated with the use of prothrombin complex concentrates in DIC because it may worsen the coagulopathy due to small traces of activated factors in the concentrate.
		Diagnostic algorithm for the diagnosis of overt disseminated intravascular coagulation.
	www.emedicine.com /MED/topic577.htm (4708 words)

	HEMOSTASIS
		This platelet mass is the substrate on which the coagulation system reacts to form a fibrin clot (scab).
		The coagulation system is a series of enzymatic reactions that results in the formation of an insoluble fibrin mesh around the platelets.
		The coagulation factors were numbers by order of discovery, not by their place in the coagulation cascade.
	www.medaille.edu /vmacer/204_lec10_hemostasis.htm (1887 words)

	Hemostasis Basics - Programmed Learner
		According to the international nomenclature system, coagulation cofactors and procoagulants were assigned roman numerals in the order of their discovery and don't correspond to their location in the coagulation sequence of activation.
		The cascade is separated into three areas: the intrinsic system, commonly measured by the aPTT test, which is activated by surface contact; the extrinsic system, commonly measured by the PT test, which is activated by vascular injury, and, the common pathway, which is set into motion by activation from the intrinsic and/or the extrinsic pathway.
		The coagulation factors, except for calcium and thromboplastin, are proteins and are involved in a sequential reaction or coagulation cascade.
	www.dadebehring.com /education/hemostasis/tutorial.htm (3211 words)

	Hypercoagulation and Illness
		As the hypercoagulability was decreased by heparin injections, the chronic illness symptoms diminished.
		Thus, the ISAC or Immune System Activation of Coagulation panel consisting of fibrinogen (FIB), soluble fibrin monomer (SFM), F1+2, T/AT, and PA by Flow was born.
		The model proposes that the end result of such pathogenmediated activation is increased blood viscosity due to 1) an underlying coagulation regulatory protein defect, and 2) activation of the coagulation system by the pathogen.
	www.springboard4health.com /notebook/health_hypercoagulation_ill.html (1549 words)

	Platelet Activation Is Not Involved in Acceleration of the Coagulation System in Acute Cardioembolic Stroke With ...
		Platelet Activation Is Not Involved in Acceleration of the Coagulation System in Acute Cardioembolic Stroke With Nonvalvular Atrial Fibrillation -- Nagao et al.
		Platelet Activation Is Not Involved in Acceleration of the Coagulation System in Acute Cardioembolic Stroke With Nonvalvular Atrial Fibrillation
		However, the coagulation system of the patients was markedly stimulated.
	stroke.ahajournals.org /cgi/content/full/26/8/1365 (2495 words)

	Blood Coagulation (Site not responding. Last check: 2007-10-24)
		In contrast to clotting times, the thrombogram measures both low and high reactivity of the clotting system and is sensitive to the action of all types of antithrombotic drugs, so that it can be used as a universal monitor of clotting function.
		This mechanism is often referred to as the coagulation cascade, even though this does not reflect the augmentation inherent to the system.
		This holds a fortiori for disorders of the coagulation mechanism and anticoagulant drugs: we have not found a single one yet that is not reflected in the thrombogram.
	www.thrombin.com /BloodCoagulation.phtml (3208 words)

	Hemostatic Mechanism (Site not responding. Last check: 2007-10-24)
		The extrinsic pathway begins with the interaction of the phospholipid tissue factor with factor VII to activate factor X. Activated factor X is also generated by the intrinsic pathway, which is initiated by contact activation of factor XII (Hageman factor) when it comes in contact with the negatively charged surfaces underlying the endothelium.
		It was assumed that the extrinsic system was the minor pathway simply because there were so few factors involved and because it was soon shown that birds and reptiles, species which are obviously lower on the evolutionary scale, posses only an extrinsic system.
		Even though the rest of the "coagulation gurus" were running with this explanation, Rosemary Biggs recognized that all was not well in the world of "cascade coagulation".
	www.cariboo.bc.ca /schs/medtech/rice/newcoag.htm (2720 words)

	MLO Online
		Hemostasis is achieved through the interaction of several systems, which include the vascular system, the coagulation system, the fibrinolytic system and platelets, as well as the kinin system, serine protease inhibitors and the complement system.
		The coagulation status of infant and pediatric patients can be severely compromised during the course of cardiopulmonary bypass due primarily to hemodilution and hypothermia.
		Dysfibrinogenemia is a coagulation disorder caused by a variety of structural abnormalities in the fibrinogen molecule that result in abnormal fibrinogen function.
	www.mlo-online.com /articles/mlo1203coverstory-hemostasis.htm (2646 words)

	Implementing a standardized POCT coagulation system Medical Laboratory Observer - Find Articles
		In choosing the best point of care system for a facility, laboratorians must validate precision and accuracy of all new assays, ensure compliance with the CLIA regulations, and most importantly, run comparative studies of old and new instrumentation to gain acceptance by all end users.
		In addition to selecting a single test system, individuals responsible for system implementation must ensure all tests are precise and accurate, and that they adhere to the CLIA regulations.
		While differences between this system and our previous instrumentation were anticipated, each hospital group involved in this area of testing had concerns, all of which had to be addressed prior to final execution of the new equipment.
	www.findarticles.com /p/articles/mi_m3230/is_6_33/ai_76638554 (387 words)

	Abstract
		The purpose of this study is to examine the effect of activated platelets on activation threshold of the coagulation system using mathematical modeling technique.
		The threshold is defined as a minimal surface tissue factor (TF) concentration at which the baseline state of the coagulation system loses its stability.
		In the absence of activated platelets, coagulation biochemical reactions occur mainly in volume, i.e.
	www.blackwellpublishing.com /isth2005/abstract.asp?id=47409 (266 words)

	The Coagulation System
		Calcium is essential in the activation of the soluble proteins of the coagulation pathway.
		There is a rapid initiation of coagulation when "Tissue Factor" (a protein-phospholipid complex normally present on vascular cells and activated monocytes), is exposed to factor VII in the presence of calcium.
		Antithrombin III, a circulating serine protease inhibitor (serpin) and heparan sulphate from the endothelium inactivate thrombin, IXa, Xa and XIa.
	www.anaesthetist.com /icu/organs/blood/coag.htm (821 words)

	TEG® Tests vs Std
		Recent advances in the understanding of coagulation mechanisms have allowed for a reappraisal and a questioning of the value of the previous standards of the PT and APTT while giving credence to the value of the whole-blood monitoring technique of the TEG® analyzer.
		The older view of a separate intrinsic and extrinsic coagulation system has been abandoned along with the waterfall descriptions of coagulation mechanisms with one enzyme working after another and with some mechanisms of feedback amplification and inhibition derived in a plasma milieu.
		Once the importance of the platelet surfaces and of other cellular surfaces and their interactions with the coagulation process are understood, the value of the PT or APTT in clinical management should be questioned.
	www.haemoscope.com /interp.html (577 words)

	Coagulation
		The primary mechanism of the coagulation pathway in vivo is tissue factor binding to activated factor VII (factor VIIa)
		Anticoagulant and fibrinolytic systems are activated simultaneously and overwhelmed, leading to disseminated microthrombi and tissue ischemia, consumption of platelets, coagulation factors and natural anticoagulants, and variable bleeding
		Clinical note: As a general rule in coagulation, type I deficiencies refer to a decrease in the absolute amount of a normal factor and type II deficiencies indicate a defective protein that may be present in normal amounts
	www.pathologyoutlines.com /coagulation.html (4544 words)

	Automated thrombogram to monitor blood coagulation: News from Thermo Electron Laboratory Equipment
		The easier it is to trigger the coagulation system, the higher the thrombotic risk.
		The automated technique is based on fluorescence and, therefore, is not affected by the appearance of a clot or the presence of platelets.
		The calibrated automated thrombogram system is described as an excellent solution for research laboratories that monitor any antithrombotic drug or combination of drugs.
	www.laboratorytalk.com /news/thr/thr113.html (379 words)

	Diseases from Clotting Problems (Site not responding. Last check: 2007-10-24)
		To understand the possible disorders associated with the blood clotting (coagulation) system, consider the goal of the system: to prevent excess bleeding.
		If the clotting system can not adequately form clots (thrombi), then the result is a bleeding disorder (hemophilia); if the clotting system forms clots too easily, then the result is formation of excess clots (thrombophilia).
		The second portion of the clotting system, the coagulation cascade, also has the potential to cause both an inability to form clots (hemophilia) or an excessive ability to form clots (thrombophilia).
	www-admin.med.uiuc.edu /hematology/Ptdiseases.htm (890 words)

	Coagulation: Consultative Hemostasis -- Hambleton et al. 2002 (1): 335 -- Hematology
		Activation of coagulation is initiated by tissue factor expression on activated mononuclear cells and endothelial cells.
		Dysfunction of the protein C system in disseminated intravascular coagulation (DIC) is due to low levels of zymogen protein C, downregulation of thrombomodulin and the endothelial protein C receptor, and low levels of free protein S due to acute phase-induced high levels of its binding protein (i.e., C4b-binding protein).
		Inhibition of endotoxin-induced activation of coagulation and fibrinolysis by pentoxifylline or by a monoclonal anti-tissue factor antibody in chimpanzees.
	www.asheducationbook.org /cgi/content/full/2002/1/335 (8425 words)

	Press Release - 03 Apr 2006 - A new coagulation monitoring system for healthcare professionals available now (Site not responding. Last check: 2007-10-24)
		Specifically designed for healthcare professionals, coagulation monitoring is made easy and safe in their daily practice, thanks to the instrument’s data storing and data management capabilities, its user-friendly design, and its new increased safety features.
		The CoaguChek XS Plus system represents the third generation of coagulation monitoring devices from Roche Diagnostics for use at the Point of Care, but is the first system specifically developed to meet healthcare professionals’ needs.
		The CoaguChek XS Plus system gives healthcare professionals information about their patients’ level of anticoagulation directly on the spot and allows them to adjust - if necessary - the doses of medication to a level which protects the patient from major complications such as thrombosis (excessive clotting) or hemorrhage (excessive bleeding).
	www.roche-diagnostics.com /publish/pr_49285.html (864 words)

	ProTech Completes Successful Demonstration of Polymer Coagulation System for Stormwater Treatment (Site not responding. Last check: 2007-10-24)
		Polymer-based coagulation systems are among the most efficient and cost-effective methods available.
		ProTech’s water treatment systems are designed to meet site-specific flow requirements and discharge permit criteria, and typically include clarifier tanks, sand filters, bag or cartridge filters, as well as the polymer coagulation system.
		Systems are also equipped with automated turbidity meters with chart recorders, overflow sensors, automatic flow control switches, or pressure sensors linked to cellular devices for remote monitoring and operation.
	www.emediawire.com /releases/2004/4/emw120469.htm (985 words)

	Temporal Relation Between Ischemic Episodes and Activation of the Coagulation System in Unstable Angina -- Biasucci et ... (Site not responding. Last check: 2007-10-24)
		Temporal Relation Between Ischemic Episodes and Activation of the Coagulation System in Unstable Angina -- Biasucci et al.
		An episodic activation of the clotting system was observed in
		episodic activation of the coagulation system was observed in
	circ.ahajournals.org /cgi/content/full/93/12/2121 (5008 words)

	Activation of the Contact System of Coagulation Does Not Contribute to the Hemostatic Imbalance in Hypertriglyceridemia ... (Site not responding. Last check: 2007-10-24)
		Activation of human factor VII in plasma and in purified systems: role of activated factor IX, kallikrein and activated factor XII.
		Detection of activation of the contact system of coagulation in vitro and in vivo: quantification of activated Hageman factor-C1-inhibitor and kallikrein-C1-inhibitor complexes by specific radioimmunoassays.
		Activation of the contact system of coagulation by a monoclonal antibody directed against a neodeterminant in the heavy chain region of human coagulation factor XII (Hageman factor).
	atvb.ahajournals.org /cgi/content/full/19/10/2548 (3470 words)

	Biology and Pathogenesis of Thrombosis and Procoagulant Activity in Invasive Infections Caused by Group A Streptococci ...
		Interleukin-1 receptor blockade in patients with sepsis syndrome: evidence that interleukin-1 contributes to the release of interleukin-6, elastase and phospholipase A2, and to the activation of the complement, coagulation and fibrnolytic system.
		Contribution of interleukin 1 to activation of coagulation and fibrinolysis, to neutrophil degranulation and the release of sPLA2 in sepsis.
		TNF and the dysbalance between coagulant and anticoagulant mechanisms in septicemia.
	cmr.asm.org /cgi/content/full/16/3/451 (6711 words)

	Coagulation Tests
		Any patient who has had major surgery, a tonsillectomy or dental extractions without unusual bleeding, has had the best evaluation of their coagulation system possible.
		This test derives its name from the use of a partial thromboplastin, or "cephalin" which is a phospholipid component that is added to a specimen that has been "activated" by exposure to a negatively charged substance (kaolin, celite or ellagic acid).
		The Haemoscope is connected to a computer and the coagulation profile is then displayed on the screen as an outline of a Thromboelastograph
	www.anaesthetist.com /icu/organs/blood/test.htm (1854 words)

	Activation of the coagulation system in Gulf War Illness: a potential pathophysiologic link with chronic fatigue ... (Site not responding. Last check: 2007-10-24)
		Activation of the coagulation system in Gulf War Illness: a potential pathophysiologic link with chronic fatigue syndrome.
		The coagulation assays include activation markers of the cascade, platelet activation and hereditary risk factors.
		This evidence of a hypercoagulable state suggests that symptoms may be due to poor blood flow and, therefore, a basis for the potential utility of anticoagulant therapy.
	www.ncf-net.org /library/hemex-GWI-CFS2000.htm (155 words)

	Surface-Mediated Control of Blood Coagulation: The Role of Binding Site Densities and Platelet Deposition -- Kuharsky ...
		Coagulation is believed to be initiated when tissue factor (TF) molecules embedded in the vessel wall are exposed by injury
		Thrombin is the final enzyme produced by the coagulation cascade, and it plays several roles in coagulation.
		system is a brief pulse of fXa, and a threshold response to this
	www.biophysj.org /cgi/content/full/80/3/1050 (6504 words)

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