surgical puncture of a vein; see illustration. Needle placement during venipuncture. To obtain good blood flow, the needle is positioned correctly in the vein lumen. The needle should not rest against the upper wall of the vein or puncture through the vein wall on the opposite side.
Introduction. Abdominal aortic aneurysm (AAA) screening is a way of detecting a dangerous swelling (aneurysm) of the aorta â the main blood vessel that runs from the heart, down through the abdomen to the rest of the body.onothan Earnshaw, Consultant Vascular Surgeon and National Director of the NHS AAA Screening Programme, explains where the abdominal aorta is located and what an abdominal aortic aneurysm looks like. Media last reviewed: 03/11/2014.
Abdominal aortic aneurysm (AAA) is a common and life threatening disease that affects 59% of the population over the age of 65 years. AAA is more common in male smokers with a positive family history of aortic aneurysms. Most patients with AAA are asymptomatic unless they develop a complication. Rupture, the most common complication of AAA, is one of the most fatal surgical emergencies; it has an overall mortality rate of approximately 90%.