Pulmonary embolism (PE) is a serious and potentially life-threatening cardiovascular and respiratory condition in which a blood clot, usually originating from the deep veins of the legs or pelvis, travels through the venous circulation and becomes lodged in one or more pulmonary arteries. The obstruction reduces or completely blocks blood flow to a portion of the lungs, interfering with normal gas exchange and placing significant strain on the right side of the heart. Pulmonary embolism is considered a critical care emergency because a large or multiple emboli can rapidly cause severe hypoxemia, hypotension, right-sided heart failure, shock, and even sudden death. The most common cause of pulmonary embolism is deep vein thrombosis (DVT). Other materials, such as fat droplets, air, or rarely tumor fragments, can also produce pulmonary vascular obstruction, but thromboembolic disease is by far the most common form. The risk of developing PE increases with prolonged immobility, major surgery, trauma,