Portal Venous System Video
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Fish Blood as a Gas Carrier Introduction The system through which blood circulates in different organs and parts of the body is called Blood Circulatory System. The presence of well-developed circulatory system can be observed in almost all animals with few exceptions. Fish have a closed type of blood circulatory system. Food, oxygen and waste products are transported from one part of the body to another through the blood flowing in such circulatory system. The circulatory system is actively involved in controlling the metabolism of food, coordinating the various organs and systems of the body, preserving, repairing, and destroying various pathogens. Although the circulatory system has special features compared to other organs, its structure is equally common. The circulatory system of fish consists of blood , blood vessels arteries and veins and the heart. Permeable membranes exist in most areas of the fish body. For this purpose, water is exchanged through the gills, and in addition to the gases dissolved in the gills, the exchange of some nitrogenous wastes and minerals is carried out. Portal Venous SystemNavigation menu
While the underlying mechanisms remain insufficiently understood, the marked changes in hemodynamic conditions in the PVS following splenectomy have been suggested to be a potential contributing factor. The aim of this study was to investigate the influences of the anatomorphological features of the PVS on hemodynamic characteristics before and after splenectomy, with emphasis on identifying the specific anatomorphological features that make postoperative hemodynamic conditions more clot-promoting. For this purpose, idealized computational hemodynamics models of the Click here were constructed based on general anatomical structures and population-averaged geometrical parameters of the PVS. In the models, we incorporated various anatomorphological variations to represent inter-patient variability. Postoperative ALS was Systme determined by the anatomical structure of the PVS, followed by some morphogeometrical parameters, such as the diameter and curvature of the splenic Systwm, and the distance between the inferior mesenteric vein and splenoportal junction.
Relatively, the angles between tributary veins and trunk veins only had mild influences on ALS. In addition, a marked increase in blood viscosity was predicted after splenectomy, especially in regions Portal Venous System low WSS, which may play an additive role to low WSS in initiating Portal Venous System. These findings suggest that the anatomical structure and some morphogeometrical features of the PVS are important determinants of hemodynamic conditions following splenectomy, which may provide useful clues to assessing the risk of postsplenectomy thrombosis based on medical imaging data.
Introduction Splenectomy is a Poortal whose indications generally include spleen rupture, hypersplenism, and symptomatic splenomegaly Cooper and Williamson, ; Weledji, In particular, splenectomy is often implemented in combination with Portal Venous System devascularization to treat patients with portal hypertension and hypersplenism, which is expected to reduce the amount of venous blood flowing into the liver thereby helping lower portal pressure and improve liver function Ikegami et al.
However, clinical studies have found that patients with histories of splenectomy are susceptible to the development of thrombosis in the portal venous system i.
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Given the severe complications e. Portal Venous System pathogenesis of venous thrombosis involves multiple factors, among which blood constituents and hemodynamic factors are most frequently concerned Rosendaal, ; Rasche, With regard to postsplenectomy thrombosis, the roles of blood constituents have been investigated extensively Sobhonslidsuk and Reddy, ; Kinjo et al. Major findings in this direction include: 1 thrombophilic disorders e.
However, controversies remain about whether these factors are able to sufficiently account for the clinically observed inter-patient differences in the risk of postsplenectomy thrombosis Winslow et al.]
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