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Intravascular hemolysis

The hemoglobin dimers that remain in circulation are oxidized to methemoglobin, which disassociates into a free heme and globin chains. The oxidized free heme (met-heme) binds to hemopexin (a β-globulin, Hpx) and the met-heme and hemopexin complex (met-heme/Hpx) is taken up by a receptor on hepatocytes and macrophages within the spleen, liver and bone marrow (only hepatocyte uptake is illustrated in the image above). Similarly, the hemoglobin/h…

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The pivotal role of thrombin in coagulation

…ulation is triggered in DIC via the extrinsic pathway, when FVII binds extravascular or intravascular tissue factor (TF), forming an autocatalytic complex. This binds to and activates FX; the TF-FVIIa-FXa complex then converts small amounts of prothrombin to thrombin. Thrombin amplifies its own production via the intrinsic pathway through FXI, which in turn activates FIX. Thrombin also activates the cofactors, FVIII and FV. Factor IXa forms a pot…

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Bilirubin in a hemolytic anemia with cholestasis

…e premature removal of RBCs, typically by extravascular hemolysis (intravascular hemolysis contributes a little to bilirubin production – the small proportion of free hemoglobin that is bound to haptoglobin is taken up by macrophages as a hemoglobin-haptoglobin complex, and the hemoglobin is degraded to unconjugated bilirubin; any unbound or free hemoglobin is excreted in the urine). The unconjugated bilirubin binds to albumin and is taken…

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Bilirubin and hemolytic anemia

…r membranes, or a parasite such as Babesia exits the cell, rupturing as it goes), the hemoglobin is liberated into the circulation, resulting in hemoglobinemia. Some of this free hemoglobin binds to proteins called haptoglobulin (shown) and hemopexin and the hemoglobin complexed to these proteins is taken up by macrophages and hepatocytes, who have receptors for the binding proteins (e.g. CD163 for haptoglobin). Both the macrophage and hepatocyte…

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Bilirubin in a hemolytic anemia

…e premature removal of RBCs, typically by extravascular hemolysis (intravascular hemolysis contributes a little to bilirubin production – the small proportion of free hemoglobin that is bound to haptoglobin is taken up by macrophages as the hemoglobin-haptoglobin complex, and the hemoglobin is degraded to unconjugated bilirubin; any unbound or free hemoglobin is excreted in the urine). The unconjugated bilirubin binds to albumin and is take…

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Biological variation within and between individuals

…um and maximum (whiskers) were created. The gray shaded area represents the population-based reference interval for each test. For creatinine, the variation within dog (width along the Y-axis between the top and bottom whisker for each dog) is lower than the variation between dogs (width along the Y-axis spanning the top whisker and bottom whisker from all dogs combined). This indicates that the variation within animals is less than the variation…

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Different hemostatic states as defined by thrombelastography

…d increased clot strength (high MA). In hypocoagulable states (C, any of the following may be seen: Slower time for fibrin formation to start (long R), slower rate of fibrin formation (long K, low α) and decreased clot strength (low MA). Note that similar results are obtained with thromboelastrometry (ROTEM) although the terminology of results is different. There is variability among investigators as to the individual or combination of test resul…

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July 2016 Case of the Month

…ould falsely decrease all counts in blood. Puppies of this age can be mildly microcytic, which may be secondary to a physiologic iron deficiency (low stores combined with rapid growth) (Question 3). However, the microcytosis is more severe than prior reported values for this age in other breeds.7 There was no evidence of gastrointestinal blood loss and the high MCHC does not support a true iron deficiency as a contributing cause of the microcytos…

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Spectrum of the different types of immune-mediated anemia

…ogs with classic IMHA (the regenerative variant) are frequently hypercoagulable (high fibrinogen, high D-dimer) and some are in concurrent disseminated intravascular coagulation. They are considered at risk of fibrosis. Hemostasis abnormalities and hyper coagulability do not appear to be as common in dogs with the non-regenerative forms of the anemia (PIMA or PRCA), however subsequent corticosteroid therapy can predispose all dogs to thrombosis….

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