Why It Is Done

A lung angiogram may be done to measure the pressure in the blood vessels carrying blood to the lungs, to look for lung problems, or to find other causes of blockage or narrowing of the vessels.

How To Prepare

Before an angiogram, tell your doctor if you:

• Are or might be pregnant.
• Are breastfeeding. Use formula (throw out your breast milk) for 1 to 2 days after the angiogram until the dye has passed from your body. This generally takes 24 hours.
• Are allergic to iodine dye used in the test.
• Have ever had a serious allergic reaction (anaphylaxis) from any substance, such as the venom from a bee sting or from eating shellfish.
• Have asthma.
• Are allergic to any medicines.
• Have any bleeding problems or are taking blood-thinning medicines.
• Have a history of kidney problems or diabetes, especially if you take metformin (such as Glucophage) to control your diabetes. The dye used during an angiogram can cause kidney damage in people who have poor kidney function.

Do not eat or drink for 4 to 8 hours before the angiogram. You may be asked to not take aspirin, aspirin products, or blood thinners for several days before the test and for 1 day after the test. If you take these medicines, talk with your doctor.

An angiogram can be done as an inpatient or outpatient. If you are an outpatient, you will stay in a recovery room for several hours before you go home. You may want to bring something to do or read to pass the time. Arrange to have someone take you home because you may get a sedative before the test. If you stay overnight in the hospital, you will probably go home the next day.

The test may take several hours, so you will empty your bladder just before it begins.

Also before the angiogram you may have other blood tests, such as blood clotting (coagulation) studies, blood urea nitrogen (BUN), and creatinine.

You will be asked to sign a consent form that says you understand the risks of the test and agree to have it done.

Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results will mean. To help you understand the importance of this test, fill out the medical test information form( What is a PDF document? ).

How It Is Done

An angiogram can be done by different types of doctors, including a radiologist, cardiologist, or surgeon. Your doctor may be helped by a radiology technologist or a nurse.

You will need to take off any jewelry. You may need to take off all or most of your clothes. You will be given a gown to wear during the test.

During the test

You will likely have an intravenous (IV) line in a vein in your arm so your doctor can give you medicine or fluids if needed. A device called a pulse oximeter, which measures oxygen levels in your blood, may be clipped to your finger or ear. Small pads or patches (electrodes) are placed on your arms, chest, or legs to record your heart rate and rhythm.

You will lie on your back on an X-ray table. Ask for a pad or blanket to make yourself comfortable. A strap, tape, or sandbags may be used to hold your body still. A lead apron may be placed under your genital and pelvic areas to protect them from X-ray exposure.

A round cylinder or rectangular box that takes the pictures during fluoroscopy will be moved above you. The fluoroscope will move under you during the test.

The place where the catheter will be inserted (in the groin or above the elbow) will be shaved and cleaned. Your doctor will numb the area with a local anesthetic. Then he or she will put a needle into the blood vessel. A guide wire will be put through the needle into the blood vessel and the needle will be removed. The catheter will be placed over the guide wire and moved into the blood vessel. The catheter will be guided through the blood vessels until the tip is in the area to be studied. Your doctor will use the fluoroscope to watch the movement of the catheter in the blood vessels.

When the catheter is in place, the dye is injected through it. You may be asked to take a breath and hold it for several seconds. Several X-ray pictures will be taken one after another. These will be available right away for your doctor to look at. You need to lie very still so the pictures are clear. Sometimes only one lung is studied, or the process may be repeated more than once for each lung.

An angiogram takes 1 to 2 hours.

After the test

The catheter is taken out after the angiogram, and pressure is put on the needle site for 10 to 15 minutes to stop any bleeding. Then the area may be covered with a bandage or a compression device. This will prevent bleeding. You will be given pain medicine if you need it.

If the catheter was put in your groin, you will need to lie still and keep your leg straight for several hours. The nurse may put a weighted bag on your leg to keep it still. If the catheter was put in your arm, you may be able to sit up and get out of bed right away. But you will need to keep your arm still for at least 1 hour.

The place in your hands and feet where your heartbeat (peripheral pulse) can be felt may be marked with a pen. Your pulse may be checked before and after the angiogram.

How It Feels

You may feel a brief sting or pinch from the numbing medicine. Most people do not have pain when the catheter is in the blood vessel.

You may feel pressure in the blood vessel as the catheter is moved. Let your doctor know if you are having pain.

You will probably feel some warmth when the dye is put in. This feeling lasts only a few seconds. For some people, the feeling of heat is strong and for others it is very mild.

You may feel a need to cough but try to keep holding your breath until you are told to breathe.

You may have a headache, flushing of the face, or a salty or metallic taste in your mouth after the dye is used. These feelings do not last long. Some people may feel sick to their stomach or may vomit, but this is not common.

After the test, you may have some tenderness and bruising at the site where the catheter was inserted.

You can drink extra fluids to pass the dye from your body unless your doctor has told you not to.

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

• Being pregnant. An angiogram is not usually done during pregnancy because the radiation could damage the developing baby (fetus).
• Having a blocked blood vessel or another blood vessel problem.
• Having high blood pressure in the blood vessels that carry blood to the lungs (pulmonary hypertension).
• Not being able to lie still during the test.
• Having an abnormal heart rhythm. Your doctor will talk to you about this.

What To Think About

• A computed tomography angiogram (CTA) or a magnetic resonance angiogram (MRA) may be an option instead of an angiogram. Each of these tests is less invasive than a standard angiogram. Some MRA tests and all CTA tests require an injection of dye. A CTA also involves radiation exposure. Some doctors may want results from a standard angiogram before doing surgery to treat a damaged or abnormal blood vessel.
  • Magnetic Resonance Angiogram (MRA)
  • CT Scan of the Body
• For people with kidney problems, diabetes, or dehydration, steps are taken to prevent kidney damage. Less dye may be used or more fluids may be given before, during, and after the test. If you have a history of kidney problems, other blood tests (creatinine, blood urea nitrogen) may be done before an angiogram to make sure that your kidneys are working well.
  • Creatinine and Creatinine Clearance
  • Blood Urea Nitrogen
• In rare cases, surgery may be needed to repair a hole in the blood vessel where the catheter was placed. There is also a substance that can be used to help plug the hole in the vessel and stop the bleeding. The substance used to plug the hole in the vessel is normally absorbed by the body over several months.