Xem 1-16 trên 16 kết quả Coagulation system
  • The coagulation and fibrinolytic systems are central to the hemostatic mechanism, which works promptly on vascular injury and tissue damage. The rapid response is generated by specific molecular interactions between components in these systems. Thus, the regulation mechanism of the sys-tems is programmed in each component, as exemplified by the elegant pro-cesses in zymogen activation.

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  • The central mechanism of DIC is the uncontrolled generation of thrombin by exposure of the blood to pathologic levels of tissue factor (Fig. 110-3). Simultaneous suppression of physiologic anticoagulant mechanisms and abnormal fibrinolysis further accelerate the process. Together these abnormalities contribute to systemic fibrin deposition in small and mid-sized vessels. The duration and intensity of the fibrin deposition can compromise the blood supply of many organs, especially the lung, kidney, liver, and brain, with consequent organ failure.

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  • Coagulation Disorders Associated with Liver Failure The liver is central to hemostasis because it is the site of synthesis and clearance of most procoagulant and natural anticoagulant proteins and of essential components of the fibrinolytic system. Liver failure is associated with a high risk of bleeding due to deficient synthesis of procoagulant factors and enhanced fibrinolysis. Thrombocytopenia is common in patients with liver disease and may be due to congestive splenomegaly (hypersplenism), or immune-mediated shortened platelet life span (primary biliary cirrhosis).

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  • Members of the serine protease inhibitor (serpin) superfamily play import-ant roles in the inhibition of serine proteases involved in complex systems. This is evident in the regulation of coagulation serine proteases, especially the central enzyme in this system, thrombin. This review focuses on three serpins which are known to be key players in the regulation of thrombin: antithrombin and heparin cofactor II, which inhibit thrombin in its pro-coagulant role, and protein C inhibitor, which primarily inhibits the throm-bin⁄thrombomodulin complex, where thrombin plays an anticoagulant role.

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  • Introduction: As coumarin rodenticides, warfarin, coumatetralyl, coumafuryl, coumachlor and bromadiolone are commercially available in Japan. The coumarin rodenticides do not show direct anticoagulant action causing bleeding, but inhibit the metabolic cycle of vitamin K; the inhibition causes the interference with protein biosynthesis of vitamin K-dependent coagulant factors (II, VII, IX and X factors) in the liver, which are very important for the blood coagulation system. The lowered coagulant factors cause the bleeding deaths of the rodents [1].

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  • I am grateful to the publishers for the invitation to produce a second edition of Applied Basic Science for Basic Surgical Training. Despite the considerable changes to education and examination, the requirement of any future surgeon to possess a comprehensive knowledge of the applied basic sciences remains the core of surgical training; a fact that is universally acknowledged by the organisations most closely involved in the shaping of the surgical curriculum.

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  • Hence, tourism marketing should not only be regarded as a tool for attracting more visitors to a region, as it has been the case for most destinations. Instead, tourism marketing should operate as a mechanism to facilitate regional development objectives and to rationalise the provision of tourism in order to ensure that the strategic objectives of destinations are achieved. Tourism marketing should also ensure equitable returns-on-resources-utilised for the production and delivery of tourism products, as well as the regeneration of these resources.

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  • The People's Republic of China operates an Internet ltering system which is widely considered to be one of the most sophisticated in the world [9]. It works, in part, by inspecting web (HTTP) trac to determine if speci c keywords are present [8]. These keywords relate to matters such as groups that the Chinese Government has banned, political ideologies that they consider unacceptable and historical events that the regime does not wish to have discussed.

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  • Introduction: Cresol is being used for an antiseptic, disinfectant, maggot-killing agent and cresol soap solution. Since various kinds of more powerful and odorless disinfectants have nowadays become available in practical use, the frequency in the use of cresol seems decreasing. However, the cases of acute poisoning by cresol are still being reported at the present time. The toxic effects of cresol are due to its corrosive actions, resulting in the destruction of cell membranes and coagulation of proteins, and its suppressive action on the central nervous system [1].

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  • Tham khảo sách 'the nature of disease: pathology for the health professions_1', y tế - sức khoẻ, y học thường thức phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Harrison's Internal Medicine Chapter 59. Bleeding and Thrombosis Bleeding and Thrombosis: Introduction The human hemostatic system provides a natural balance between procoagulant and anticoagulant forces. The procoagulant forces include platelet adhesion and aggregation and fibrin clot formation; anticoagulant forces include the natural inhibitors of coagulation and fibrinolysis. Under normal circumstances, hemostasis is regulated to promote blood flow; however, it is also prepared to clot blood rapidly to arrest blood flow and prevent exsanguination.

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  • Sites of action of the four major physiologic antithrombotic pathways: antithrombin (AT); protein C/S (PC/PS); tissue factor pathway inhibitor (TFPI); and the fibrinolytic system, consisting of plasminogen, plasminogen activator (PA), and plasmin. PT, prothrombin; Th, thrombin; FDP, fibrin(ogen) degradation products. [Modified from BA Konkle, AI Schafer, in DP Zipes et al (eds): Braunwald's Heart Disease, 7th ed. Philadelphia, Saunders, 2005.] Antithrombin (or antithrombin III) is the major plasma protease inhibitor of thrombin and the other clotting factors in coagulation.

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  • Underlying Systemic Diseases that Cause or Exacerbate a Bleeding Tendency Acquired bleeding disorders are commonly secondary to, or associated with, systemic disease. The clinical evaluation of a patient with a bleeding tendency must therefore include a thorough assessment for evidence of underlying disease. Bruising or mucosal bleeding may be the presenting complaint in liver disease, severe renal impairment, hypothyroidism, paraproteinemias or amyloidosis, and conditions causing bone marrow failure.

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  • The study aimed to investigate hemostasis system of myeloma patients. Platelet , PT, APTT, TT, fibrinogen, Ethanol test, euglobulin lysis time, D- Dimer were mesured in 45 patients with myeloma. The result shows that patients with myeloma have disorders in the coagulant balance with hypocoagulability. There is a positive correlation between elevated blood protein negative correlation between elevated blood protein and PT% and APTT, TT; Tóm tắt Nhằm mục đích đánh giá hệ thống đông cầm máu ở bệnh nhân đa u tuỷ xương, chúng tôi tiến hành các XN…..

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  • joined the academic community after a career in private practice, the classroom was an alien place to me. I puzzled over the fact that the students I taught, who were of the very highest quality, still had trouble grasping the topics. I began to pay more critical attention to the textbooks I had selected for them, and I quickly learned the student perspective of most pathology texts: they are difficult to read. Most pathology books are compilations written by multiple authors, each with a certain writing style and with differing views about the relative importance of things.

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  • The human hemostatic system provides a natural balance between procoagulant and anticoagulant forces. The procoagulant forces include platelet adhesion and aggregation and fibrin clot formation; anticoagulant forces include the natural inhibitors of coagulation and fibrinolysis. Under normal circumstances, hemostasis is regulated to promote blood flow; however, it is also prepared to clot blood rapidly to arrest blood flow and prevent exsanguination. After bleeding is successfully halted, the system remodels the damaged vessel to restore normal blood flow. ...

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