Contrast Media

Contrast Media. Ionic and nonionic contrast media are administered intravenously and intra-arterially to supplement imaging; complexed gadolinium may be administered for both MRI and x-ray–based imaging. Hypo- and isoosmolar iodinated media are used instead of hyperosmolar because they are considered less nephrotoxic. Contrast material can produce a brisk diuresis, and bladder catheterization may be necessary.