A coronary angiogram is a procedure that uses X-ray imaging to see your heart's blood vessels. Coronary angiograms are part of a general group of procedures known as cardiac catheterization.
Heart catheterization procedures can both diagnose and treat heart and blood vessel conditions. A coronary angiogram, which can help diagnose heart conditions, is the most common type of heart catheter procedure.
During a coronary angiogram, a type of dye that's visible by X-ray machine is injected into the blood vessels of your heart. The X-ray machine rapidly takes a series of images (angiograms), offering a detailed look at the inside of your blood vessels. If necessary, your doctor can perform procedures such as angioplasty during your coronary angiogram.
Why it's done
Your doctor may recommend that you have a coronary angiogram if you have:
You may also need an angiogram if you're going to have surgery unrelated to your heart, but you're at high risk of having a heart problem during that surgery.
Because there's a small risk of complications, angiograms are usually done after noninvasive heart tests have been performed, such as an electrocardiogram, an echocardiogram or a stress test.
As with most procedures done on your heart and blood vessels, coronary angiogram has some risks. Major complications are rare, though. Potential risks and complications include:
How you prepare
In some cases, coronary angiograms are performed on an emergency basis. More commonly, though, they're scheduled in advance, giving you time to prepare.
Angiograms are performed in the catheterization (cath) lab of a hospital. Usually you go to the hospital the morning of the procedure. Your health care team will give you specific instructions and talk to you about any medications you take. General guidelines include:
Before your angiogram procedure starts, your health care team should review your medical history, including allergies and medications you take. The team may perform a physical exam and check your vital signs — blood pressure and pulse. You empty your bladder and change into a hospital gown. You may have to remove contact lenses, eyeglasses, jewelry and hairpins.
What you can expect
During the procedure
An intravenous (IV) line is inserted into a vein in your arm. You may be given a sedative through the IV to help you relax, as well as other medications and fluids. You'll be awake during the procedure so that you can follow instructions. Throughout the procedure you may be asked to take deep breaths, hold your breath, cough or place your arms in various positions.
Electrodes on your chest monitor your heart throughout the procedure. A blood pressure cuff tracks your blood pressure and another device, a pulse oximeter, measures the amount of oxygen in your blood. You may receive medication (anticoagulants) to help prevent your blood from clotting on the catheter and in your coronary arteries.
A small amount of hair may be shaved from your groin or arm where the catheter is to be inserted. The area is washed and disinfected and then numbed with an injection of local anesthetic. A small incision is made at the entry site and a short plastic tube (sheath) is inserted into your artery. The catheter is inserted through the sheath into your blood vessel and carefully threaded to your heart or coronary arteries.
Threading the catheter shouldn't cause pain, and you won't feel it moving through your body. Tell your health care team if you have any discomfort.
Dye (contrast material) is injected through the catheter. When this happens, you may have a brief sensation of flushing or warmth. Don't be alarmed if you feel your heart skipping beats — that's a frequent occurrence during angiograms. But again, tell your health care team if you feel pain or discomfort.
The dye is easy to see on X-ray images, and as it moves through your blood vessels, your doctor can observe its flow and identify any blockages or constricted areas. Depending on what your doctor discovers during your angiogram, you may have additional catheter procedures at the same time, such as a balloon angioplasty or a stent placement to open up a narrowed artery.
Having an angiogram takes about one hour, although it may be longer, especially if combined with other heart catheter procedures. Preparation and post-procedure care can add several more hours.
After the procedure
You'll be taken to a recovery area for observation and monitoring. When your condition is stable, you return to your own room, where you're monitored regularly. You'll need to lie flat for several hours to avoid bleeding. During this time, pressure may be applied to the incision to prevent bleeding and promote healing. Sometimes, the plastic sheath that was first inserted into your blood vessel is left in place for several hours or even overnight if you've had angioplasty or stent placement. If you received anticoagulants during the procedure, removing the sheath too soon could trigger heavy bleeding.
You may be able to go home the same day, or you may have to remain in the hospital for a day or longer. Drink plenty of fluids to help flush the dye from your body. If you're feeling up to it, have something to eat. Ask your health care team when you should resume taking your medications, bathe or shower, return to work, and resume other normal activities. Avoid strenuous activities and heavy lifting for several days. Your puncture site is likely to remain tender for a while. It may be slightly bruised and have a small bump.
Call your doctor's office if:
If the catheter site is actively bleeding or begins swelling, apply pressure to the site and contact emergency medical services.
To complete a coronary angiogram, a catheter is inserted in an artery in your groin and threaded through your blood vessels to your heart. Your doctor uses the angiogram to check for blocked or ...
An angiogram can show doctors what's wrong with your blood vessels. It can:
Knowing this information can help your doctor determine what treatment is best for you and how much danger your heart condition poses to your health. Based on your results, your doctor may decide, for instance, that you would benefit from having coronary angioplasty to help unblock clogged arteries. It's also possible that angioplasty or stenting could be done during your angiogram to avoid needing another procedure.
Last Updated: 2011-02-17
© 1998-2013 Mayo Foundation for Medical Education and Research (MFMER). All rights reserved. A single copy of these materials may be reprinted for noncommercial personal use only. "Mayo," "Mayo Clinic," "MayoClinic.com," "Mayo Clinic Health Information," "Reliable information for a healthier life" and the triple-shield Mayo logo are trademarks of Mayo Foundation for Medical Education and Research.
Terms and conditions of use