Hemorrhage and Shock

Hemorrhage and Shock - Hemorrhage and Shock Hemorrhage...

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Hemorrhage and Shock Hemorrhage (bleeding)= a discharge or escape of blood from the blood vessels into the surrounding tissues or to the exterior of the body or into a body cavity Causes: Trauma to large blood vessels due to surgical procedures Weakened artery (from atherosclerosis= ex abdominal aortic aneuryism; congenital weakness= ex. Berry aneurysm in Willis circulation) Infections (pulmonary tuberculosis) Invasive tumours (erosion of vessel wall) Hypertension (increase in intraluminal blood pressure) Hemorrhagic diatheses (spontaneous hemorrhage); affecting capillaries (small blood vessels) including thrombocytopenia, severe decrease in number of platelets, deficiency of coagulation/clotting factors Definitions Hematoma= bleeding into soft tissues Purpura= diffuse, superficial haemorrhages in the skin, as large as 1cm Ecchymosis= a larger superficial hemorrhage (ex black eye); skin discoloration reflects products of heme degradation from haemoglobin in the RBCs
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This note was uploaded on 02/08/2012 for the course PATHOLOGY 3245 taught by Professor X during the Spring '11 term at UWO.

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Hemorrhage and Shock - Hemorrhage and Shock Hemorrhage...

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