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Low levels of platelets in turn may lead to prolonged or excessive bleeding. It is the most common coagulation disorder among intensive care patients and is seen in a fifth of medical patients and a third of surgical patients. [3] A normal human platelet count ranges from 150,000 to 450,000 platelets/microliter (μL) of blood. [4]
Mutations in the human CD36 gene were first identified in a patient who, despite multiple platelet transfusions, continued to exhibit low platelet levels. [45] [46] This condition is known as refractoriness to platelet transfusion. Subsequent studies have shown that CD36 found on the surface of platelets.
The surface of the unactivated platelet looks similar to the surface of the brain–a wrinkled appearance from numerous shallow folds that increase the surface area; early dendritic, an octopus with multiple arms and legs; early spread, an uncooked frying egg in a pan, the "yolk" is the central body; and the spread, a cooked fried egg with a ...
As in non-pregnant individuals, ITP in pregnancy is a diagnosis of exclusion and other potential causes of low platelets in pregnancy require consideration. These include obstetrical causes such as pre-eclampsia, HELLP syndrome (hemolysis, elevated liver enzymes and low platelets), or thrombotic microangiopathies that may occur during pregnancy ...
Thrombotic thrombocytopenic purpura (TTP) is a blood disorder that results in blood clots forming in small blood vessels throughout the body. [2] This results in a low platelet count, low red blood cells due to their breakdown, and often kidney, heart, and brain dysfunction. [1]
Unusually low calcium can cause more serious problems such as fainting, nerve irritation [citation needed] and short-duration tetany. Such an acute hypocalcaemia is usually due to low calcium levels prior to donation, aggravated by the anticoagulant. Hypocalcaemia can be curtailed by modestly increasing dietary calcium intake in the days prior ...
Calcium is also required at other points in the coagulation cascade. Calcium ions play a major role in the regulation of coagulation cascade that is paramount in the maintenance of hemostasis. Other than platelet activation, calcium ions are responsible for complete activation of several coagulation factors, including coagulation Factor XIII. [43]
Commonly used low molecular weight heparins are enoxaparin, dalteparin, nadroparin and tinzaparin. [5] [6] In HIT, the platelet count in the blood falls below the normal range, a condition called thrombocytopenia. However, it is generally not low enough to lead to an increased risk of bleeding.
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