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.
Authentication, authorization, and accounting (AAA) is a term for a framework for intelligently controlling access to computer resources, enforcing policies, auditing usage, and providing the information necessary to bill for services.