Pathology 3240A Lecture Notes - Lecture 5: Aortic Aneurysm, Thrombocytopenia, Vasodilation

• School: Western University
• Department: Pathology
• Course: Pathology 3240A
• Professor: Aaron Haig

Document Summary

Hemorrhage (bleeding): a discharge or escape of blood from the b. v. s into the surrounding tissues or to the exterior of the body or into a body cavity. Trauma to large b. v. s due to surgical procedures or fracture: weakened artery (from atherosclerosis [e. g. abdominal aortic aneurysm], or congenital weakness [e. g. berry aneurysm in willis circulation]) o o. Invasive tumours (erosion of vsl wall: hypertension (incr intraluminal bp, hemorrhagic diatheses (spontaneous hemorrhage) Purpura: diffuse, superficial hemorrhages in the skin (as large as 1 cm) Ecchymosis: larger superficial hemorrhage (e. g. black eye) o. Petechia: pinpoint hemorrhage (1-2 mm), usually in the skin: rupture of capillaries or arterioles in skin/mucous membranes/serosal surfaces. Hemothorax/hemopericardium: collection of blood in the pleural cavities/pericardial cavity due to rupture of heart/aorta. Hemoperitoneum: collection of blood in abd cavity due to rupture of an aortic aneurysm or trauma to liver/spleen/aorta.