F5 and atrial fibrillation: In the case of thromboembolism, coronary thrombi or emboli can result from a variety of thromboembolic disorders, including (1) acquired thromboembolic causes (left ventricular thrombus, prosthetic heart valves, atrial fibrillation, etc.)and (2) hereditary thromboembolic causes [protein C/S and antithrombin deficiency, factor V Leiden, etc.] [21,130,131].