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 AAA server is a server program that handles user requests for access to computer resources and, for an enterprise, provides authentication, authorization, and accounting (AAA) services.he AAA server typically interacts with network access and gateway servers and with databases and directories containing user information. The current standard by which devices or applications communicate with an AAA server is the Remote Authentication Dial-In User Service (RADIUS) .