In medicine,<unk><unk>  is a means of<unk> ing the bloodstream through the peripheral or central blood vessels in order to obtain blood or deliver medications including<unk> . A<unk><unk>  procedure involves insertion of a sterile plastic tube called a catheter into a blood vessel. Types of catheters can be either peripherally or centrally located. Peripheral catheters are approximately one inch (25 mm) long and are inserted into the small veins of the forearm. Central catheters are bigger and longer and are inserted into the large veins of the extremities, neck, or chest. Central venous catheters are the primary modality used for delivery of<unk> utic agents. The duration of central venous catheterization is dependent on the type of treatment given.
Vascular access for chemotherapy
Preoperative fasting
Preoperative care
Surgery for benign prostatic hyperplasia
Biologics for immunosuppression
Management of heart failure
Antibiotic prophylaxis
Surgery for the dysfunctional sacroiliac joint