Which contrast media is commonly used as the main contrast agent for venography, angiography, and CT?

Which contrast media is commonly used as the main contrast agent for venography, angiography, and CT?

• A. Omnipaque (iohexol)
• B. Visipaque
• C. Gastrografin
• D. Gastromiro

Answer: (A)

Iohexol (Omnipaque) is a nonionic, low-osmolar iodinated contrast agent. Its low osmolality and nonionic structure reduce the risk of adverse reactions compared with older ionic contrast, making it safer for intravenous use in venography and arterial use in angiography, while still providing excellent radiopacity for CT enhancement. Because it’s well tolerated, widely available in multiple concentrations, and has suitable viscosity for different injection routes, it has become the common mainstay across venography, angiography, and CT protocols. Visipaque (iodixanol) is iso-osmolar and also used, especially in patients at higher risk of nephrotoxicity, but it isn’t as universally applied across all three modalities as iohexol in many settings. Gastrografin (diatrizoate) is a high-osmolar contrast typically used for gastrointestinal studies, not as a standard vascular contrast for venography, angiography, or CT. The remaining option is not a standard clinically used agent in current practice.

Iohexol (Omnipaque) is a nonionic, low-osmolar iodinated contrast agent. Its low osmolality and nonionic structure reduce the risk of adverse reactions compared with older ionic contrast, making it safer for intravenous use in venography and arterial use in angiography, while still providing excellent radiopacity for CT enhancement. Because it’s well tolerated, widely available in multiple concentrations, and has suitable viscosity for different injection routes, it has become the common mainstay across venography, angiography, and CT protocols. Visipaque (iodixanol) is iso-osmolar and also used, especially in patients at higher risk of nephrotoxicity, but it isn’t as universally applied across all three modalities as iohexol in many settings. Gastrografin (diatrizoate) is a high-osmolar contrast typically used for gastrointestinal studies, not as a standard vascular contrast for venography, angiography, or CT. The remaining option is not a standard clinically used agent in current practice.