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Coronary artery bypass graft surgery (CABG)
Provided by Escorts Heart Institute Brought to you by Healthbase
Coronary artery bypass graft surgery (CABG) involves sewing one end an artery or vein above
a blocked coronary artery and the other end below the blockage,
thereby allowing blood an alternative means to get to the heart. The
arteries or veins used for the bypass (which are known as "grafts")
are usually obtained from the leg or the chest wall. Bypass surgery
may not be possible if the coronary artery is heavily calcified or if
the disease is very widespread. CABG can be done with or without
connecting the patient to heart-lung machine, depending on the kind
of blockages and surgeon's decision.
Several new surgical
approaches are being developed, which can potentially reduce the
discomfort and complications associated with traditional bypass
surgery. These are collectively referred to as being "minimally
invasive." In general, these approaches focus on performing
bypass surgery though a very small chest incision and performing
bypass surgery while the heart is still beating (ie, without the need
for a heart/lung bypass machine).
OPCAB (Off Pump Coronary
Artery Bypass)
The bypass surgery done without connecting the
patient to of heart-lung machine or pump is called OPCAB.
MIDCAB
(Minimally Invasive Direct Coronary Artery Bypass)
is bypass
surgery done through a small cut (incision) in the lower part of the
sternum (chest bone) only, rather than full cut across it. This type
of surgery, which is possible in selected cases only, is associated
with a small scar, lesser pain and faster recovery. Alternatively,
this surgery can also be done through a small cut on the left side of
the chest.
The location and degree of coronary artery
blockages are determined before surgery by using a procedure called
heart catheterization, or coronary angiogram. This procedure provides
an outline, like a road map, of the arteries of the heart.
Factors
favoring bypass surgery
Bypass surgery is often recommended
over angioplasty when the left main coronary artery is narrowed by
more than 50 percent, when angioplasty does not relieve angina, when
many arteries are narrowed, or when the heart's left ventricular
pumping function is substantially impaired. Bypass surgery is also
preferred over angioplasty in diabetic patients who have two or three
vessels involved.
Benefits
Bypass surgery can very
effectively relieve angina and can even prolong life in people with
severe coronary heart disease, such as those with three-vessel
involvement associated with impaired left ventricular pumping
function. However, the success of bypass surgery on symptoms and on
survival depends upon several factors, including the pattern and
extent of arterial narrowing, the general progression of coronary
heart disease over time, and the blood vessels used for bypass. In
general, bypass surgery is more likely than angioplasty to provide
complete revascularisation.
About 95 percent of people who
have narrowing of several arteries have improvement or complete
relief of their angina immediately after surgery. About 85 to 90
percent of people remain angina-free at one to three years after
surgery, and about 75 percent of people remain angina-free or free of
major coronary events at five years after surgery. By 10 years, about
one-half of all grafted vessels become narrowed or occluded, and by
15 years, about 85 percent of grafted vessels become narrowed or
occluded. These late events usually require a second surgery
Recovery from bypass surgery
It usually takes a
while to recover from even routine bypass surgery. However, about 70
to 80 percent of people who have this surgery are eventually able to
return to work; this is about the same as the percentage of people
who are treated medically and are able to return to work. Factors
that appear to have a role in a person's ability to return to work
are the presence or absence of angina after surgery, employment
status before surgery and income, the function of the heart's left
ventricle, and age.
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