CO2-based contrast is not typically used in coronary angiography because it is what?

CO2-based contrast is not typically used in coronary angiography because it is what?

• A. No
• B. Yes
• C. Only in emergency
• D. Only with iodinated contrast

Answer: (A)

CO2 acts as a negative contrast agent, but its use in coronary angiography is limited because it often does not provide reliable, high-quality opacification of the small and tortuous coronary arteries. Its buoyancy means in a typical patient it may not reach the coronary ostia or fill the vessels adequately, leading to suboptimal images. There is also a real risk of gas embolism to the coronary circulation, which can cause myocardial ischemia or arrhythmias. For these reasons, CO2 is not routinely used in coronary angiography, and iodinated contrast remains the standard; CO2 may be considered only in select cases where iodinated contrast is contraindicated.

CO2 acts as a negative contrast agent, but its use in coronary angiography is limited because it often does not provide reliable, high-quality opacification of the small and tortuous coronary arteries. Its buoyancy means in a typical patient it may not reach the coronary ostia or fill the vessels adequately, leading to suboptimal images. There is also a real risk of gas embolism to the coronary circulation, which can cause myocardial ischemia or arrhythmias. For these reasons, CO2 is not routinely used in coronary angiography, and iodinated contrast remains the standard; CO2 may be considered only in select cases where iodinated contrast is contraindicated.