You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is The most definitive method of diagnosing pulmonary embolism is : and explain in detail?
Answer is A (Pulmonary aeriography): `Selective pulmonary angiography is the most specific examination available for establishing the definitive diagnosis of PE.'-Harriosn 16th/1563 Most definitive investigation :Pulmonary angiography is an invasive procedure, and it is the most definitive procedure. It is however ceainly not the initial investigation of choice. The initial investigation of choice in a case of suspected pulmonary embolism is either a lung ventilation perfusion scan or a CT of the chest with intravenous contrast. `CT scanning of the chest with intravenous contrast is the principal imaging test for diagnosis of PE.' - Harrison `Lung scanning (V/Q scan) is now a second line diagnostic test for PE' Most definitive / specific test for PE Q Best initial imaging test for diagnosis of PEdeg Pulmonary angiographyQ CT scan with intravenous contrast Q (Preferred choice, against a lung V-Q scan)