Catheterization

In medicine, a catheter is a thin flexible tube that a health professional may insert into part of the body. The process of inserting a catheter is catheterization.

Placement of a catheter into a particular part of the body may allow:

• draining urine from the urinary bladder as in urinary catheterization
• administration of intravenous fluids, medication or parenteral nutrition
• injection of dye or radio-opaque contrast into blood vessels or other structures to visualize abnormalities, as in cardiac catheterization, which is part of coronary angiography
• direct measurement of blood pressure in a artery or vein
• infusion of local anesthetics and other drugs for epidural anesthesia

A central line is a conduit for giving drugs or fluids into a large-bore catheter positioned either in a vein near the heart or just inside the atrium.

See also:

• cannula stent