Human activity is causing environmental degradation, which is the deterioration of the environment through depletion of resources such as air, water and soil; the destruction of ecosystems; habitat destruction; the extinction of wildlife; and pollution.
Screening for abdominal aortic aneurysm (AAA) Research studies suggest that a routine ultrasound scan is worthwhile for all men aged 65. This is because most people with an AAA do not have symptoms. Following a routine scan, surgery can be offered to men found to have an aneurysm over 5.5 cm wide.
For the thoracic aorta, a diameter greater than 3.5 cm is generally considered dilated, whereas greater than 4.5 cm would be considered aneurysmal. Aneurysms may affect one or more segments of the thoracic aorta, including the ascending aorta, the arch, and the descending thoracic aorta.As many as 25% of patients with TAA also have an abdominal aortic aneurysm.neurysms may affect one or more segments of the thoracic aorta, including the ascending aorta, the arch, and the descending thoracic aorta. As many as 25% of patients with TAA also have an abdominal aortic aneurysm.