Lower Extremity Angiography
Lower Extremity angiography is a test used to see the arteries in feet, or legs. It is also called peripheral angiography.
Angiography uses x-rays and a special dye to see inside the arteries. Arteries are blood vessels that carry blood away from the heart.
How the Test is Performed
You will lie on an x-ray table. You may ask for some medicine to make you sleep and relaxed (sedative) if you are anxious about the test.
The health care provider will shave and clean an area, usually in the groin.
- A numbing medicine (anesthetic) is injected into the skin over an artery.
- A needle is placed into that artery.
- A thin plastic tube called a catheter passed through the needle into the artery. The health care provider moves it into the area of the body being studied. The doctor can see live images of the area on a TV-like monitor, and uses them as a guide.
- Dye flows through the catheter.
- X-ray images are taken of the artery
Certain treatments can be done during this procedure. These treatments include:
- Dissolving a blood clot with medicine
- Opening a partially blocked artery with a balloon
- Placing a small tube called a stent into an artery to help hold it open
The health care team will check your pulse (heart rate), blood pressure, and breathing during the procedure.The catheter is removed when the test is done. Pressure is placed on the area for 10 – 15 minutes to stop any bleeding. A bandage is then put on the wound.The arm or leg where the needle was placed should be kept straight for 6 hours after the procedure. You should avoid strenuous activity, such as heavy lifting, for 24 – 48 hours.
How to Prepare for the Test
You should not eat or drink anything for 6 – 8 hours before the test.You may be told to stop taking certain medications such as aspirin or other blood thinners for a short while before the test. Never stop taking any medicines unless told to do so by your health care provider.
Make sure your health care provider knows about all the medicines you take, including those bought without a prescription. This includes herbs and supplements.
Tell your health care provider if you:
- Are pregnant
- Are allergic to any medications
- Have ever had an allergic reaction to x-ray contrast material or iodine substances
- Have ever had any bleeding problems
How the Test Will Feel
The x-ray table is hard and cold. You may want to ask for a blanket or pillow. You may feel some stinging when the numbing medicine is injected. You may also feel some pressure as the catheter is moved.
The dye can cause a feeling of warmth and flushing. This is normal and usually goes away in a few seconds.
You may have tenderness and bruising at the site of the catheter insertion after the test. Seek immediate medical help if you have:
- Bleeding that doesn’t go away
- Severe pain in an arm or leg
Why the Test is Performed
Your doctor may order this test if you have symptoms of a narrowed or blocked blood vessel in the arms, hands, legs, or feet.
The test may also be done to diagnose:
- Swelling or inflammation of the blood vessels (angiitis)
The x-ray shows normal structures for the age of the patient.
What Abnormal Results Mean
An abnormal result is common due to narrowing and hardening of the arteries in the arms or legs due to plaque build-up (hardening of the arteries) in the artery walls.
The x-ray may show a blockage in the vessels caused by:
- Aneurysms (abnormal widening or ballooning of part of an artery)
- Blood clots
- Other diseases of the arteries
Abnormal results may also be due to:
- Inflammation of the blood vessels
- Injury to the blood vessels
- Thromboangiitisobliterans (Buerger’s disease)
- Takayasu’s disease
Complications may include:
- Allergic reaction to the contrast dye
- Blood clot that travels to the lungs
- Damage to the blood vessel as the needle and catheter are inserted
- Excessive bleeding or a blood clot where the catheter is inserted, which can reduce blood flow to the leg
- Heart attack or stroke
- Hematoma — a collection of blood at the site of the needle puncture
- Injury to the nerves at the needle puncture site
- Kidney damage from the dye
There is low-level radiation exposure. However, most experts feel that the risk of most x-rays is smaller than other risks we take every day. Pregnant women and children are more sensitive to the risks of the x-ray.