What are the side effects of a coronary CTA?

A coronary computed tomography angiography (CTA) -- a study of the inside of your tiny heart vessels -- may cause you to feel the following:

• During the injection of contrast, you may feel a warm, flushed sensation. This feeling is normal for any contrast injection.
• The medication given to slow the heart rate has been known to cause some people to feel dizzy when they stand suddenly. The dizziness is slight and only happens rarely.
• The nitroglycerin spray used to dilate the coronary arteries has been known to dilate all blood vessels, causing flushing, dizziness, or headache in some people. The onset is immediate, and the duration of symptoms is approximately 30 minutes or less.