Can you describe cardiac catheterization?

See Below: Usually, sedation is given - a 2mm incision is made in the femoral artery at the groin, a sheath is inserted, the artery is cannulated with a catheter, dye is injected via catheter to provide contrast so that the cardiologist can read the images via fluoroscopy (x-ray).The injection of dye is repeated to attain images of the heart from enough angles to provide a complete 'picture' of coronaries.

Cardiac cath: Check out this site for more info: http://www.Nhlbi.Nih.Gov/health/health-topics/topics/cath/.