Preparation: The child may need to fast for a few hours before the procedure. Sedation or general anesthesia may be administered to ensure the child remains still. Insertion of a catheter: A thin, flexible tube called a catheter is inserted into a blood vessel, usually in the groin or arm. The catheter is then guided to the area of interest. Injection of contrast agent: A contrast agent is injected through the catheter, which helps to highlight the blood vessels on imaging studies. Imaging: X-rays, CT scans, or MRI scans are taken to visualize the blood vessels and any abnormalities.
