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Hemostasis occurs when blood is present outside of the body or blood vessels. It is the innate response for the body to stop bleeding and loss of blood. During hemostasis three steps occur in a rapid sequence. Vascular spasm is the first response as the blood vessels constrict to allow less blood to be lost.
External bleeding is generally described in terms of the origin of the blood flow by vessel type. The basic categories of external bleeding are: Arterial bleeding: As the name suggests, blood flow originating in an artery. With this type of bleeding, the blood is typically bright red to yellowish in colour, due to the high degree of oxygenation.
Ancient Greek painting on a vase, showing a physician (iatros) bleeding a patientBloodletting (or blood-letting) is the deliberate withdrawal of blood from a patient to prevent or cure illness and disease.
Anticoagulant medications may need to be discontinued and possibly reversed in patients with clinically significant bleeding. [13] Patients that have lost excessive amounts of blood may require a blood transfusion. [14] The use of cyanoacrylate glue to prevent bleeding and seal battle wounds was designed and first used in the Vietnam War. [15]
The stick is applied directly to the bleeding site. The high ionic strength promotes flocculation of the blood, and the astringent chemical causes local vasoconstriction. Before safety razors were invented, a styptic pencil was a standard part of a shaving kit and was used to seal shaving cuts. [ 13 ]
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Platelet plug formation: The adhered platelets aggregate and form a temporary plug to stop bleeding. This process is often called "primary hemostasis". [19] Coagulation cascade: It is a series of enzymatic reactions that lead to the formation of a stable blood clot. The endothelial cells release substances like tissue factor, which triggers the ...
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