Cerebral angiography is done in the hospital or radiology center.
- You will be asked to lie on an x-ray table.
- Your head is held still using a strap, tape, or sandbags, so you do not move it during the procedure.
- Before the test starts, you will be given a mild sedative to help you relax.
- Electrocardiogram (ECG) is used to monitor your heart activity during the test. Sticky patches, called leads, will be placed on your arms and legs. Wires connect the leads to the ECG machine.
An area of your body, usually the groin, is cleaned and numbed with a local numbing medicine (anesthetic). A thin, hollow tube called a catheter is placed through an artery and carefully moved up through the main blood vessels in the belly area and chest and into an artery in the neck. X-rays help guide the doctor to the correct position.
Once the catheter is in place, a special dye (contrast material) goes through the catheter. X-ray images are taken to see how the dye moves through the artery and blood vessels of the brain. The dye helps highlight any blockages in blood flow.
Sometimes, a computer removes the bones and tissues on the images being viewed, so that only the blood vessels filled with the contrast dye are seen.
This is called digital subtraction angiography (DSA).
After the x-rays are taken, the needle and catheter are withdrawn. Pressure is immediately applied on the leg at the site of insertion for 10 - 15 minutes to stop the bleeding. After that time, the area is checked and a tight bandage is applied. Your leg should be kept straight for 4 - 6 hours after the procedure. Watch the area for bleeding for at least the next 12 hours.