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University Communication
Sent: Wednesday, December 16, 2009 12:44
To: [log in to unmask]
Subject: [Ucomm_health-l] Evolution of Brain Surgery to Destroy Rogue Blood
Vessels
This news release and any accompanying images can be accessed on the web at:
http://ucsdnews.ucsd.edu/newsrel/health/12-09BloodVessels.asp
December 16, 2009
Media Contact: Jackie Carr, 619-543-6163, [log in to unmask]
Evolution of Brain Surgery to Destroy Rogue Blood Vessels
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UC San Diego Medical Center has pioneered the successful treatment of
arteriovenous malformations.
Over three decades, a world-recognized medical team at UC San Diego Medical
Center has spurred the evolution of a complex surgery to destroy dangerous
clusters of arteries and veins in the brain. Integrating innovative
approaches in radiology, anesthesia, and surgery, the team has perfected a
method to systematically starve these abnormal brain lesions, artery by
artery, vein by vein.
"In the late 70s and early 80s, medical teams attempted to remove these
lesions during a single surgery, frequently encountering catastrophic
episodes of brain swelling," said John C. Drummond, MD, professor and
anesthesiologist at UC San Diego Medical Center. "Today, with a combination
of embolization, the use of a medical coma, and staging shorter surgeries,
patients experience consistently good outcomes."
The brain lesion, called an arteriovenous malformation (AVM), ranges in size
from less than one to 10 centimeters in diameter. The defect can also occur
in the spinal cord, and affects more than 300,000 Americans per year. While
many patients show no signs of the abnormality, more than 10 percent
experience debilitating symptoms. The untreated lesion can be fatal.
"The malformation looks like a wild tangle of snarled blood vessels," said
Hoi Sang "Ben" U, MD, professor and neurosurgeon at UC San Diego Medical
Center. "The clustering of arteries and veins deprives the rest of the brain
of blood. Risks range from painful lingering headaches to massive
hemorrhage."
As a "living" lesion that monopolizes the brain's blood supply, the
malformation is difficult to remove. Capable of recruiting blood supplies
from other vessels, the abnormality is stubborn, like a tumor, and will grow
back if it is not entirely removed.
In the early days of the procedure, the UC San Diego surgical team was faced
with removing the growth while protecting the brain from a sudden,
potentially dangerous shift in blood flow.
Reducing Blood Flow
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Neuroradiologists at UC San Diego attack the growth by embolizing abnormal
blood channels through a catheter-based process.
"It wasn't until the 80s that AVMs were addressed by radiologists as a way
of pre-treating a patient to improve the results of surgery," said Scott
Olson, MD, assistant clinical professor and radiologist at UC San Diego
Medical Center. "Now, using catheter-based technology, we can often shut
down 50-80 percent of the blood vessels that feed the AVM. With 3D
rotational imaging, thinner and more flexible catheters, and new liquid
embolic agents that better penetrate the lesion, we can more accurately
target and eliminate the vessels that lead into the AVM."
Prior to surgery, neuroradiologists attack the growth by embolizing, or
plugging up, abnormal blood channels with particles of glue. During the
process, a thin catheter is threaded through the leg's femoral artery and up
into the brain. Once inside the brain, the catheter weaves through tiny
vessels, often curving in hair pin turns, before reaching the center of the
AVM. The neuroradiologist must be able to visualize the growth in a three
dimensional space, making anterior and posterior turns that are only
millimeters in length.
"Sometimes the vessel leads directly to the AVM and can be plugged fairly
easily. Other times, the vessel leads to a healthy portion of the brain but
has channels that branch off to feed the AVM," said Olson. "When you are
treating an area of the brain that can impact speech and cognition, the
stakes are high. Fortunately, at an academic medical center, we have the
advantage of advanced training and new technologies to best treat our
patients."
A Deep Sleep
Anesthesiologists further refined the approach to the AVM by inducing a deep
coma before and during surgery. The coma slows the metabolism of the body,
reducing blood flow to the brain. By slowing the body's functioning, and
causing a slow awakening from anesthesia, the brain has ample time to adapt
to changes in blood flow.
"The barbiturate-based coma lessens the shock of removal of the AVM, giving
the brain time to rehabilitate and heal. Then by progressively removing the
growth over months, with multiple surgeries in shorter duration, the brain
adjusts to the changes without harming the healthy surrounding brain," said
U.
Removing the Lesion
Photo of
The AVM appears as a wild tangle of snarled blood vessels.
During surgery to treat the AVM, a section of the skull is removed to access
the AVM. Guided by a high-powered microscope, the malformation is slowly and
methodically cauterized. Two to five procedures may be required to eliminate
the entire lesion.
"There are other options, such as radiation, to treat these malformations,
but the results are temporary and will not obliterate the growth," added
Drummond. "Today, with this surgery, you can compare angiograms and see
permanent results. The AVM is gone, clean as a whistle."
AVMs develop in the embryo and often do not cause symptoms until the patient
is in their 20s or 30s. Complications from the AVM may manifest as a range
of neurological problems including headaches, seizures, and hemorrhage.
"Even if a person suffers a hemorrhage and appears to lose functionality,
the damage may not be permanent. Patients can and do regain neurological
function," said U. "The brain can wake up."
Waking Up the Brain
Jeff Hogue, 29, a San Diego attorney, first experienced the effects of an
AVM as an undergraduate student.
"The first headache was so intense that it was almost unbearable," said
Hogue. "I remember thinking that something had to be wrong inside my brain."
Misdiagnosed as a migraine, the pain lapsed, only to return a decade later
followed by stroke-like symptoms.
"I was in my office and had writer's block which was unusual for me," said
Hogue. "I tried logging into my email but my fingers stopped working. I
could recall my password but my brain could not communicate with my
fingers."
A trip to a local hospital revealed a 2-inch AVM.
"A surgeon recommended Dr. U to my family,saying that Dr. U was a surgeon he
would choose for himself," said Hogue.
Hogue transferred to UC San Diego Medical Center for treatment. He arrived
aware of his circumstances but unable to speak or write. Three surgeries
later, he has recovered his speech and motor skills. He continues to
practice real estate law and has recently returned from a Bali honeymoon.
"Treating the AVM is not easy but I am happy to be alive, no question," said
Hogue.
"The AVM has disappeared from Jeff's angiograms," said U. "He is benefitting
from a treatment that has evolved here at UC San Diego Medical Center for
three decades. Generations of physicians have refined and taught this
technique. This achievement is something you will only find within an
academic medical center."
UCSD News on the web at: http://ucsdnews.ucsd.edu
<http://ucsdnews.ucsd.edu/>
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