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During an EchoCG (echocardiography), it is crucial to measure the systolic pressure in the pulmonary artery in order to rule out pulmonary hypertension. 2. Chest X-ray. This is primarily performed to rule out tuberculosis, tumors, as well as hydrothorax and other abnormal conditions. If there are risk factors present (smoking experience of more than 30 packs /years, burdened family history), a chest CT scan may be recommended. 3.