1. Introduction
Central venous access devices are small catheters that are placed either directly or indirectly into the superior venacava or right atrium for the following purposes: drug administration, nutrition, dialysis of the kidneys, antibiotic therapy or transplantation of the bone marrows among other reasons. They are often used when the smaller veins are inaccessible or medications or nutrients cannot be administered via the smaller veins. The use of CVAD is often marred by two major problems: occlusion by thrombosis and infection. The patency of the catheter must be maintained. Nurses use normal saline or heparin in order to maintain the ...