A, also called pulonar thromboembolism, pulmonary embolism occurs when a blood clot in a blood vessel located moves to a lung artery and causes clogging. Sometimes blood volume contributed by the other non-clogged arteries is insufficient to prevent the death of tissue, and is thus as a pulmonary infarction occurs. The formation of these blood clots (therefore also referred to this disease pulmonary embolism) has its origins in a blood stagnation caused by many factors, among which the fixed assets due to surgery, postoperative, varices, presence of catheterizations, genetic alterations, presence of some diseases and cancer. Generally, symptoms of pulmonary embolism are breathlessness, anxiety, acute chest pain, dizziness, fainting or seizures, and cyanosis (bluish skin). We must pay close attention and request urgent medical attention for these symptoms, as in the cases of patients with severe heart or lung disorders as pulmonary embolism can cause death within two hours. For the diagnosis of this disease they are carried out various analyzes and testing, and venous ultrasound of lower and upper extremities, echocardiograms, and numerous specific tests pulmonary (lung scan and angiography, CT angiography, chest ...). Once diagnosed, treatment can specify which usually includes oxygen, analgesics and anticoagulants such as heparin or warfarin. In cases where the patient's life is endangered surgery is required.