Weight Loss Surgery
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How Well Does Weight Loss Surgery Work?
People who have had bariatric (stomach) surgery started out with an average
BMI
of 50 and dropped their BMIs to 32.6 after 10 years. In general, the
malabsorptive surgeries caused more weight loss than the restrictive
surgeries. As
people lose weight after these surgeries, they show improvement in the
diseases that are related to obesity. These improvements are larger in
the first 2 years after surgery than 10 years later. A
common misconception is that people think they will lose more weight
than they actually do with these surgeries. Notice that although the
BMIs dropped significantly, the average was still in the obese range. Who Can Get Weight Loss Surgery?
There
are recommendations on who should be evaluated for weight loss surgery.
A person should have a BMI of 40 or more or have a BMI of 35 or more
along with one of a list of certain medical conditions that are related
to obesity. Surgery is a big deal and does have risks. Before
undergoing surgery, people need to have tried other weight loss methods
before and been unsuccessful on them. Even with the surgery, a person
must still put effort into losing weight. You need to be motivated and
committed to losing weight. It is recommended that everyone who is
considering weight loss surgery undergo a psychological evaluation.
This is so that doctors can be sure that people have realistic
expectations of their weight loss, assess motivation, and rule out any
psychiatric illness that will interfere with diet after surgery. Some
people can have other medical conditions that make the surgery too
risky, and they should not have these procedures done. Benefits Of
course there is weight loss. However, these surgeries are not promises
to automatically turn you into a supermodel. You should have a full
discussion with your doctor and surgeon about how much you can expect
to lose. Along with weight loss,
there come several benefits. There are fewer deaths in the long run for
people who need the surgery and get it, and fewer people die of
diabetes,
heart artery disease,
and
cancer.
The improvement in diabetes lasts for a long time. In the gastric banding procedures, there is a short term improvement in
high blood pressure,
but in people who had gastric bypass and lost more weight, there was a sustained improvement in high blood pressure.
Sleep apnea,
shortness of breath, chest pain, and quality of life showed more improvement in people who lost more weight.
Around
90% of people who have Roux-en-Y gastric bypass surgery see improvement
of cure of their diabetes, high blood pressure, and cholesterol levels.
Those who had lap banding also saw a significant amount of improvement
in these conditions. People who
needed and had either Roux-en-Y gastric bypass or the lap band
surgeries have about a 30% less chance of dying within the next 10
years. For more on the risks and benefits of
bariatric surgery concerning
pregnancy, click here. What are the Risks of Weight Loss Surgery? Weight
loss surgery is becoming more popular and several celebrities have
undergone these procedures, making them seem like easy miracle cures.
They often do not mention the risks. There are risks of complications
with any surgery and these are best discussed with your doctor and a
bariatric surgeon. The risk of death is somewhere between 0.1% and 2%.
Malabsorptive procedures have the most risk for death, while gastric
banding seems to have the least. Some other complications after surgery
are: blood clots, leaks where intestines were joined, bleeding,
hernias, gallstones, ulcers, dehydration, intestine blockage, and
others. A return stay in the hospital or secondary surgery may be
needed to address these issues. When going back to eating after the surgery, a condition called
dumping syndrome
can occur in up to 70% of people after Roux-en-Y gastric bypass. In
this syndrome, body chemicals normally released during digestion become
out of balance when people start eating again. The effects can include
facial flushing, lightheadedness, fast heart beats, fatigue, and
diarrhea. A
long term complication of some of these procedures is a deficiency of
certain nutrients because the intestines cannot absorb as many of them.
Iron, calcium, folate, vitamin B12, and others may be deficient in
people who get the malabsorption procedures. Some more involved
surgeries can also lead to deficiencies in
protein
absorption and
vitamins A, D, E, and K.
Who Should Perform My Surgery?
It
has been shown that the more experience that a surgeon and the hospital
has, the lower the risk of complications. A study found that the lowest
risks came with surgeons who performed more than 100 of these surgeries
per year and the hospitals hosted more than 150 surgeries per year. There is a learning curve, so be sure your surgeon and hospital are
experienced. Also, to make sure long term progress is made and any
complications can be managed, you should be set up with a well
coordinated team of experts in medicine, surgery, psychology, and
nutrition. The American Society of Bariatric
Surgery (now the American Society for Metabolic and Bariatric Surgery), the
American College of Surgeons, and several insurance providers have developed
criteria for Bariatric Centers of Excellence. This new but may be something to
look for when considering a facility for your surgery. The criteria include:
- Institutional requirements for bariatric equipment
- A registry to monitor patient outcomes
- Designated bariatric surgical wards
- Immediate availability of critical care and other
specialists
- Surgical leadership
- Clinical pathways
- Continued nursing education
- Minimum volume requirements
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It is important you discuss any weight loss or exercise plan with your doctor. Only you and your physician can decide what is best for you. Some people have certain conditions that prevent them from doing all exercises, and goal body weights may be different for different people. You need to discuss all these things with your physician before starting any weight loss or exercise program. Dr. Vickery is not a surgeon. For more specifics on surgical procedures, contact a board certified bariatric surgeon.
This
article was written by
John
Vickery, MD.
References New England Journal of Medicine 2007;356:2176-2183 New England Journal of Medicine 2007;357:753-761 Ann Intern Med 2005;142:525-531 Treatment Guidelines from the Medical Letter 2003;1:101-106 Treatment Guidelines from the Medical Letter 2008;6:23-28
Surgery 2008 Nov; 144:736
Photo Credits in order of appearance on this
page
1. http://flickr.com/people/ex_magician/
2. http://flickr.com/people/dalehugo/
3. Open license

Last updates: 7/19/09
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