Iodixanol

A nonionic, dimeric, iodinated contrast agent used in medical imaging

File:Iodixanol-2D-skeletal.svg

2D skeletal structure of Iodixanol

Iodixanol is a nonionic, dimeric, iodinated contrast agent used in various medical imaging procedures, including computed tomography (CT) scans, angiography, and cardiac catheterization. It is marketed under the trade name Visipaque.

Chemical Structure

Iodixanol is a dimeric compound, meaning it consists of two identical molecular units. The presence of iodine atoms in its structure is crucial for its function as a contrast agent, as iodine is highly effective at absorbing X-rays. This property enhances the contrast of images obtained during radiographic procedures.

Pharmacokinetics

Iodixanol is administered intravenously and is distributed throughout the extracellular fluid space. It is not metabolized by the body and is excreted unchanged in the urine. The elimination half-life of iodixanol is approximately 2 hours in patients with normal renal function.

Clinical Uses

Iodixanol is used in a variety of diagnostic imaging procedures:

• Computed Tomography (CT): Enhances the visibility of blood vessels and tissues, aiding in the diagnosis of conditions such as tumors, infections, and vascular diseases.
• Angiography: Used to visualize blood vessels and assess conditions like atherosclerosis, aneurysms, and vascular malformations.
• Cardiac Catheterization: Helps in the evaluation of coronary artery disease and other cardiac conditions.

Safety and Side Effects

Iodixanol is generally well-tolerated, but like all contrast agents, it can cause adverse reactions. Common side effects include nausea, headache, and a warm sensation. Rarely, it can cause more serious reactions such as allergic reactions, nephrotoxicity, and thyroid dysfunction.

Advantages

Iodixanol is iso-osmolar, meaning its osmolarity is similar to that of human blood. This property reduces the risk of adverse reactions compared to hyperosmolar contrast agents. It is particularly beneficial for patients with renal impairment or those at risk of contrast-induced nephropathy.

Related pages

• Contrast agent
• Computed tomography
• Angiography
• Cardiac catheterization