What happens during CT scan?
The Coronary CT scan takes about 30 minutes. Before the scan begins the x-ray staff will explain the test and the equipment used. An Intravenous (IV) line will be started by a nurse. You will be asked to lie on a table connected to the CT scanning machine. The technologist (tech) will place cardiac monitor leads on your chest and the table will move to line up your body with the scanning machine.
The tech will keep in contact with you throughout the exam by intercom. As the exam begins, it is very important that you lie still and follow the instructions of the tech and doctor. A slow, even heart rate produces the best results for this CT scan. Because people may be nervous or have a naturally higher heart rate, a medication called Lopressor, a fast acting Beta Blocker, may need to be given through the intravenous (IV) line to help slow your heart rate down. The same line will be used to inject Iodine contrast agent (dye) which highlights the blood vessels in the heart.
You will be given a single Nitroglycerin tablet under your tongue which will dilate the coronary arteries being examined. For short intervals throughout the scan, the technologist will ask you to hold your breath, which also helps lower your heart rate.
As the dye is injected, you may feel warm and flushed or feel the urge to urinate. You may also note a metallic taste in your mouth. These are normal effects. Please tell the staff immediately if you note any of the following:
- shortness of breath
- hives
- itching