A coronary angiogram is a
procedure that uses X-ray imaging to see your heart's blood vessels. The test
is generally done to see if there's a restriction in blood flow going to the
heart.
Coronary angiograms are part of a
general group of procedures known as heart (cardiac) catheterizations. Cardiac
catheterization procedures can both diagnose and treat heart and blood vessel
conditions. A coronary angiogram, which can help diagnose heart conditions, is
the most common type of cardiac catheterization procedure.
During a coronary angiogram, a
type of dye that's visible by an X-ray machine is injected into the blood
vessels of your heart. The X-ray machine rapidly takes a series of images
(angiograms), offering a look at your blood vessels. If necessary, your doctor
can open clogged heart arteries (angioplasty) during your coronary angiogram.
Why it's done
Your doctor may recommend that you have a coronary angiogram if
you have:
·
Symptoms of coronary artery disease, such as chest pain (angina)
·
Pain in your chest, jaw, neck or arm that can't be explained by
other tests
·
New or increasing chest pain (unstable angina)
·
A heart defect you were born with (congenital heart disease)
·
Abnormal results on a noninvasive heart stress test
·
Other blood vessel problems or a chest injury
·
A heart valve problem that requires surgery
Because there's a small risk of complications, angiograms aren't
usually done until after noninvasive heart tests have been performed, such as
an electrocardiogram, an echocardiogram or a stress test.
Risks
As with most procedures done on
your heart and blood vessels, a coronary angiogram has some risks, such as
radiation exposure from the X-rays used. Major complications are rare, though.
Potential risks and complications include:
·
Heart attack
·
Stroke
·
Injury to the catheterized artery
·
Irregular heart rhythms
(arrhythmias)
·
Allergic reactions to the dye or
medications used during the procedure
·
Kidney damage
·
Excessive bleeding
·
Infection
How you prepare
In some cases, coronary
angiograms are performed on an emergency basis. More commonly, though, they're
scheduled in advance, giving you time to prepare.
Angiograms are performed in the
catheterization (cath) lab of a hospital. Your health care team will give you
specific instructions and talk to you about any medications you take. General
guidelines include:
·
Don't eat or drink anything after
midnight before your angiogram.
·
Take all your medications to the
hospital with you in their original bottles. Ask your doctor about whether or
not to take your usual morning medications.
·
If you have diabetes, ask your
doctor if you should take insulin or other oral medications before your
angiogram.
What you can expect
Before the procedure
Before your angiogram procedure
starts, your health care team will review your medical history, including
allergies and medications you take. The team may perform a physical exam and
check your vital signs — blood pressure and pulse.
You'll also empty your bladder
and change into a hospital gown. You may have to remove contact lenses,
eyeglasses, jewelry and hairpins.
During the procedure
· Cardiac catheterization procedure approaches
For the procedure, you lie on
your back on an X-ray table. Because the table may be tilted during the
procedure, safety straps may be fastened across your chest and legs. X-ray
cameras may move over and around your head and chest to take pictures from many
angles.
An IV line is inserted into a
vein in your arm. You may be given a sedative through the IV to help you relax,
as well as other medications and fluids. You'll be very sleepy and may drift
off to sleep during the procedure, but you'll still be able to be easily
awakened to follow any instructions.
Electrodes on your chest monitor
your heart throughout the procedure. A blood pressure cuff tracks your blood
pressure and another device, a pulse oximeter, measures the amount of oxygen in
your blood.
A small amount of hair may be
shaved from your groin or arm where a flexible tube (catheter) will be
inserted. The area is washed and disinfected and then numbed with an injection
of local anesthetic.
Coronary angiogram
A small incision is made at the
entry site, and a short plastic tube (sheath) is inserted into your artery. The
catheter is inserted through the sheath into your blood vessel and carefully
threaded to your heart or coronary arteries.
Threading the catheter shouldn't
cause pain, and you shouldn't feel it moving through your body. Tell your
health care team if you have any discomfort.
Dye (contrast material) is
injected through the catheter. When this happens, you may have a brief
sensation of flushing or warmth. But again, tell your health care team if you
feel pain or discomfort.
The dye is easy to see on X-ray
images. As it moves through your blood vessels, your doctor can observe its
flow and identify any blockages or constricted areas. Depending on what your
doctor discovers during your angiogram, you may have additional catheter
procedures at the same time, such as a balloon angioplasty or a stent placement
to open up a narrowed artery.
Having an angiogram takes about
one hour, although it may be longer, especially if combined with other cardiac
catheterization procedures. Preparation and post-procedure care can add more
time.
After the procedure
When the angiogram is over, the
catheter is removed from your arm or groin and the incision is closed with
manual pressure, a clamp or a small plug.
You'll be taken to a recovery
area for observation and monitoring. When your condition is stable, you return
to your own room, where you're monitored regularly.
You'll need to lie flat for
several hours to avoid bleeding if the catheter was inserted in the groin.
During this time, pressure may be applied to the incision to prevent bleeding
and promote healing.
You may be able to go home the
same day, or you may have to remain in the hospital overnight. Drink plenty of
fluids to help flush the dye from your body. If you're feeling up to it, have
something to eat.
Results
An angiogram can show doctors what's wrong with your blood vessels.
It can:
·
Show how many of your coronary arteries are blocked or narrowed
by fatty plaques (atherosclerosis)
·
Pinpoint where blockages are located in your blood vessels
·
Show how much blood flow is blocked through your blood vessels
·
Check the results of previous coronary bypass surgery
·
Check the blood flow through your heart and blood vessels
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