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.
There is good evidence that screening and surgical repair of large aneurysms (5.5 cm or greater) in men 65-75 years of age who have ever smoked leads to decreased AAA-related deaths. 1  Only men aged 65-75 who have ever smoked have a net benefit from screening for AAA. 2  Women are at lower risk for AAAs.herefore, the absolute reduction in mortality due to screening is 0.14% (a relative decrease of 43%). Screening for AAA does not reduce all-cause mortality. Harms from screening include the morbidity and mortality from surgical repair for those with aneurysms needing treatment.