Thromboembolic Events

Whether an ischemic stroke is due to a noncardiogenic or cardiogenic source, the mechanism of causing a stroke is the same. Both sources are involved with the development of thrombi or emboli that move from their original source to the brain blocking blood flow in the process. Known as Virchow’s triad, venous stasis, vascular injury, and hypercoagulability are major components in the development of thrombi.

Venous Thrombosis

Definition

Blood clot formed due to blood changes in which cellular material, such as red and white blood cells and platelets, become bound together by fibrin strands. Deep Vein Thrombosis (DVT), forming in the veins of the lower limbs, are the most common emboli associated with pulmonary emboli.

Signs/Symptoms

Nonspecific; pain, tenderness, swelling, discoloration (paleness or redness) in lower extremities.

Pulmonary Embolism

Definition

Thrombus arising within the circulatory system and obstructing pulmonary blood flow in the pulmonary artery or any of its branches.

Signs/Symptoms

Nonspecific, insensitive, clinically silent.
Common signs — dyspnea, tachypnea, chest pain, shock, hemoptysis