Medical Health Encyclopedia

Cerebral angiography

Digital subtraction angiography (DSI) uses a computer to "subtract" out the bones and tissues in the region viewed such that only the vessels filled with contrast are seen.

How to prepare for the test:

• Advise the health care provider if you are pregnant or if you have ever had any bleeding problems. Allergic reactions to x-ray contrast dye or any iodine substance and any other allergic reactions should be mentioned.
• You must sign a consent form.
• Routine blood tests will be done and an examination of the nervous system performed before the procedure.
• Food or fluid may be restricted 4 - 8 hours before the procedure.
• You will be given a hospital gown to wear. You must remove all jewelry.
• A sedative or pain pill may be given to you before the procedure.

Infants and children:

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The preparation you can provide for this test depends on your child's age, previous experiences, and level of trust. For general information regarding how you can prepare your child, see the following topics:

• Infant test or procedure preparation (birth to 1 year)
• Toddler test or procedure preparation (1 to 3 years)
• Preschooler test or procedure preparation (3 to 6 years)
• Schoolage test or procedure preparation (6 to 12 years)
• Adolescent test or procedure preparation (12 to 18 years)

How the test will feel:

The x-ray table may be hard and cold, but you may ask for a blanket or pillow. There is a brief sting when the local anesthetic is given. This does not numb the artery, so there will be brief, sharp pain as the catheter is inserted into the artery. There is a slight feeling of pressure as the catheter is advanced.

As the dye is injected, there may be a warmth or burning sensation. You may experience a slight headache or feel flushed on the side of the face. There may be slight tenderness and bruising at the site of the injection after the test.