Aortic aneurysms if not detected and treated can cause dangerous complications. Abdominal bleeding due to aortic aneurysm is one of the complications that can lead to death if the patient is not treated promptly.

Internal circulation in the human body consists of two circulatory loops: the large circulatory loop and the small circulatory loop (pulmonary circulation). Gas exchange in the lungs occurs when blood circulates through the lungs, an important process to create oxygen-rich blood to supply the body's tissues and organs.