What is the
|What does "Bypass Surgery" mean?
Bypass Surgery can be performed on any artery in the body, but most
often involves the coronary arteries (the arteries that supply blood to
the heart muscle itself). During Bypass Surgery, a graft vein or artery is
taken from a healthy blood vessel in the body. The graft is then
surgically attached above and below an obstructed or poorly functioning
artery. After surgery, the blood will flow thru the graft vessel, avoid or
"bypass" the blocked vessel, and provide oxygen and nutrients necessary
for survival to the area of tissue beyond the blockage.
Why is the doctor performing this surgery?
To bypass, or go around, the obstruction caused by a coronary (heart)
artery filled with a clot or with plaque (Atherosclerosis). If the
obstruction is not bypassed, the heart muscle beyond the obstruction is
denied oxygen and nutrients leading to heart damage (heart attack or chest
There are two types of Coronary Artery Bypass Surgeries (CABGs) routinely
- On Pump - On Pump CABG is also known as "Traditional Bypass
Surgery". The pumping and oxygenation function of the heart is taken over by a
heart-lung machine during the surgery, and medications are given that briefly
paralyze the heart (cardioplegia). This way, the heart is completely at rest
while the surgeon performs the bypass surgery.
- Off Pump/Beating Heart -
Off Pump CABG is also known as "Beating Heart Bypass Surgery" and is another method of Bypass Surgery. Surgeons at
St. Mary perform nearly 80 percent of CAGB procedures off-pump. A heart-lung
machine is not used, and the heart is not stopped with medications. Instead,
the heart continues to perform its pumping and oxygenation functions while the
surgeon works. The surgeon stabilizes just the portion of the heart where the
bypass is needed, while the remainder of the heart continues to function
normally. According to the Journal of the American Heart Association, off-pump
bypass, in the appropriate patients, is as safe and effective as standard
on-pump coronary bypass surgery, and many healthcare professionals, including
our surgeons believe it may reduce the risk of stroke, bleeding and renal
failure. Off-pump bypass is not for everyone, and there is no long-term data
available about outcomes…yet. However, it is a highly effective surgical
option which you can discuss with your doctor.
There are four sources used during bypass surgery for the healthy graft blood
- Endoscopic Vein Harvesting - The saphenous vein in the leg is the
most common vein used as a bypass graft. Traditionally, the saphenous vein was
obtained via a long incision in the leg, from groin to ankle. Contrary to
popular perception, this usually presents the highest degree of
post-procedural pain. This new endoscopic technique requires only two or three
1-inch long incisions in the leg. An endoscope connected to a video camera is
then inserted into the smaller incisions and the saphenous vein is removed
with far less scarring and trauma. This technique is only available in select
centers throughout the US.
- Arterial Bypass - There are several arteries that can be used as
grafts for bypass surgery, but the most common is the left internal mammary
artery (LIMA). The right internal mammary artery (RIMA) may also be used as a
graft. These arteries are accessed thru the same chest incision used to access
the heart. Occasionally, the radial (in the arm) or the gastroepiploic (near
the stomach) arteries may be used, each accessed thru separate incisions.
- Sutureless Anastomic Device - On occasion, surgeons use a
sutureless device, which can be used for the part of a vein graft that is
attached to the aorta. The saphenous vein is loaded onto a device that is
inserted into a small hole the surgeon has cut in the patient's aorta. He or
she then pushes a button, releasing a tiny web of wires, which unfold to form
a star-shaped rivet. Your doctor can determine if this is an option for you.
- Donor Saphenous Vein - This is a vein that has been cryopreserved
and stored in a tissue bank. It is blood type specific for the patient.
Where is the surgery performed?
Both On-Pump and Off-Pump/Beating Heart surgeries are performed in the
Operating Room (OR), and under general anesthesia.
How long does this surgery take?
The length of time surgery takes will vary based on the number of vessels
being bypassed, the graft location, On-Pump vs. Off-Pump/Beating Heart
procedure, the patient's associated medical problems, etc, but usually an
On-Pump or Off-Pump/Beating Heart surgery will take between 3-6