Coronary angiography is a procedure that uses a special dye (contrast material) and x-rays to see how blood flows through the arteries in your heart.
Cardiac angiography; Angiography – heart; Angiogram – coronary
How the test is performed
Coronary angiography is usually done along with cardiac catheterization.
Before the test starts, you will be given a mild sedative to help you relax.
An area of your body, usually the arm or groin, is cleaned and numbed with a local numbing medicine (anesthetic). The cardiologist passes a thin hollow tube, called a catheter, through an artery and carefully moves it up into the heart. X-ray images help the doctor position the catheter.
Once the catheter is in place, dye (contrast material) is injected into the catheter. X-ray images are taken to see how the dye moves through the artery. The dye helps highlight any blockages in blood flow.
The procedure may last 30 to 60 minutes.
How to prepare for the test
You should not eat or drink anything for 8 hours before the test starts. You may need to stay in the hospital the night before the test. Otherwise, you will check in to the hospital the morning of the test.
You will wear a hospital gown. You must sign a consent form before the test. Your healthcare provider will explain the procedure and its risks.
Tell your doctor if you are allergic to seafood, if you have had a bad reaction to contrast material in the past, if you are taking Viagra, or if you might be pregnant.
How the test will feel
You will usually be awake during the test. You may feel some pressure at the site where the catheter is placed.
You may feel a flushing or warm sensation after the dye is injected.
After the test, the catheter is removed. You might feel a firm pressure at the insertion site, used to prevent bleeding. If the catheter is placed in your groin, you will usually be asked to lie flat on your back for a few hours after the test to avoid bleeding. This may cause some mild back discomfort.
Why the test is performed
Coronary angiography may be done if you have:
- Angina for the first time
- Angina that is becoming worse, not going away as fast, occurring more often, or happening at rest (called unstable angina)
- Aortic stenosis
- Atypical chest pain, when other tests are normal
- Had an abnormal heart stress test
- To have surgery on your heart and you are at high risk for coronary artery disease
- Heart failure
- Recent heart attack
There is a normal supply of blood to the heart and no blockages.
What abnormal results mean
An abnormal result may mean you have a blocked artery. The test can show how many coronary arteries are blocked, where they are blocked, and the severity of the blockages.
What the risks are
Cardiac catheterization carries a slightly increased risk when compared with other heart tests. However, the test is very safe when performed by an experienced team.
Generally the risk of serious complications ranges from 1 in 1,000 to 1 in 500. Risks of the procedure include the following:
Irregular heart beats
Injury to a heart artery
Low blood pressure
Allergic reaction to contrast dye
Considerations associated with any type of catheterization include the following:
- In general, there is a risk of bleeding, infection, and pain at the IV site.
- There is always a very small risk that the soft plastic catheters could actually damage the blood vessels.
- Blood clots could form on the catheters and later block blood vessels elsewhere in the body.
- The contrast dye could damage the kidneys (particularly in patients with diabetes).
If a blockage is found, your healthcare provider may perform a percutaneous coronary intervention (PCI) to open the blockage. This can be done during the same procedure, but may be delayed for various reasons.