This is defined as sudden cessation of blood flow in the main artery as a result of thrombosis, embolism, spasm, injury etc… Causes of thrombosis ( Virchow triad: § the predominance of the coagulation system § damage to the vascular wall § Turbulent blood flow ( Diseases leading to thrombosis: § Atherosclerosis. § Occlusive disease. § Nonspecific aorto-arteritis. Embologenic disease - the state of the body leading to the occurrence of embolism ® Cardiac (95%): ® CHD (50%) - myocardial infarction, rhythm abnormalities (atrial fibrillation, arrhythmia et al.), Heart aneurysm. ® Heart disease (40%). ® Myocarditis, endocarditis, pneumonia (5%) ® Noncardia (5%) - vascular aneurysm. Pathogenesis of acute ischemia ® Closing of the main artery. ® Peripheral arterial spasm. ® Blood stasis. ® Continued thrombosis - upward and downw...