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Cardiac catheterization is a medical procedure that cardiologists, or heart specialists, use to evaluate heart function and diagnose cardiovascular conditions. During cardiac catheterization, a long narrow tube called a catheter is inserted into an artery or vein from either in your groin, neck, or arm. This catheter is threaded through your blood vessel until it reaches your heart. A dye can be injected through the catheter that allows your doctor to look at the vessels and chambers of the heart with the use of a special X-ray machine. Once the catheter is in place, your doctor can use it to run diagnostic tests.
View an illustration of cardiac catheterization. Quick facts. Cardiac cath is performed to find out if you have disease of the heart muscle, valves or coronary (heart) arteries. During the procedure, the pressure and blood flow in your heart can be measured. Coronary angiography is done during cardiac catheterization.