The catheter is then advanced toward the head. The dye is injected and moves through the vessels that supply the brain. At the same time, x-rays are taken. Images are viewed on a TV monitor and transferred to a series of still films. After the test, the person is typically kept at bed rest for 12 to 24 hours.
Providers closely watch for signs of a blood clot, stroke, or neurological problems.
These include numbness, tingling, weakness in limbs, vision problems, confusion, and dizziness. Signs of delayed reaction to the contrast dye include itching, rash, sweating, or difficulty breathing. The puncture site is treated with ice and firm pressure. If the site was in the leg, it should be kept straight for at least 12 hours. The person should drink plenty of fluids to rid the body of the dye.