Renal vein thrombosis is the obstruction of the renal vein by a thrombus. Arterial thrombosis is the formation of a thrombus within an artery. In thrombotic stroke, a thrombus (blood clot) usually forms around atherosclerotic plaques. An embolism in which the embolus is a piece of thrombus is called a thromboembolism. Thrombophlebitis is a phlebitis ("inflammation" of a vein) related to a thrombus (blood clot). Venous thrombus (clots in the veins) are quite common. They work by preventing platelet aggregation and thrombus formation. The free-moving thrombus is called an embolus. It works by reducing platelet aggregation and thrombus formation. Another major cardiovascular disease involves the creation of a clot, called a "thrombus". Another intervention for acute cerebral ischaemia is removal of the offending thrombus directly. This platelet plug grows into a thrombus, resulting in a stenotic artery. These agents lyse the ischemia-causing thrombus quickly and effectively. A carotid massage can also possibly dislodge a thrombus, or some plaque. Pharmacologic management of ACM involves arrhythmia suppression and prevention of thrombus formation.