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.
An Abdominal Aortic Aneurysm (AAA), a specific kind of aneurysm, is a condition in which the lining of the blood vessel called the aorta is enlarged within the abdomen.Abdominal aortic aneurysms pose a threat because they are usually silent until a medical emergency occurs.s the lining weakens from age and other risk factors, the vessel wall thins and expands. The most common location for an AAA is between where the aorta divides to supply blood to the kidneys and where it divides to supply blood to the pelvis and legs.