How It Is Done
This test is performed in the cardiac catheterization laboratory ("cath lab") by a
Before the test
You will be asked to lie on a flat
table under a large X-ray machine. Several small metal leads (electrodes) will
be attached to your legs and arms with a special paste or gel. These leads are
connected to an
electrocardiogram (EKG, ECG) machine that continuously
records the electrical activity of your heart during the test.
device called a
pulse oximeter that measures oxygen levels in your
blood and monitors your pulse may be clipped to your finger.
intravenous (IV) needle will be inserted into a vein in one of your
arms to give you fluids or medicine during the procedure. Through the IV line you will receive a
medicine to help you relax (sedative). You may
be awake during the procedure. But even if you are awake, the sedative may make
you so sleepy that you may not remember much about the procedure.
During the test
The catheter insertion
area will be shaved and cleansed with an antiseptic solution before the test.
Sterile towels will be draped over you, except for the area over
the catheter insertion site. There are a few options for where the catheter is inserted. If you are having a cardiac catheterization to check the right side of your heart, the catheter is inserted into a vein in your neck or groin. If the test will check the left side of your heart or your coronary arteries, the catheter is inserted into an artery in your groin or arm.
local anesthetic will be injected into the skin at the
insertion site. A blood vessel is punctured by a special needle or exposed by
making a small cut in the skin so that the catheter can be passed into the
blood vessel . The catheter is slowly advanced through the blood vessel into
your body. The catheter tip is moved into various positions in the heart's
vessels and chambers while the doctor watches its progress on the imaging
screen. Pressures within the heart chambers can be measured. Blood and heart
tissue samples may also be removed through the catheter, if necessary.