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Adjustable gastric band
Adjustable gastric banding, or Lap band surgery, is a form of restrictive weight loss surgery (bariatrics) designed for obesity patients with a body mass index (BMI) of 40 or greater - or between 35 – 40 with those who have comorbidities that are known to improve with weight loss. The gastric band is an inflatable silicone prosthetic device which is placed around the top portion of the stomach via keyhole laparoscopic surgery.
Additional recommended knowledge
Theory of gastric banding
The placement of the band creates a small pouch at the top of the stomach which holds approximately 50 ml. This pouch 'fills' with food quickly and the passage of food from the top to the bottom of the stomach is slowed. As the upper part of the stomach believes it is ‘full’, the message to the brain is that the stomach is full and this sensation helps the person to eat smaller portions and lose weight over time.
The band is inflated/adjusted via a small access port placed just under the skin subcutaneously. Radiopaque isotonic solution or saline is introduced into the band via the port. A specialized needle is used to avoid damage to the port membrane. There are many port designs and they may be placed in varying positions based on the surgeon’s preference. The port may be sutured in place. When fluid is introduced the band expands, placing pressure around the outside of the stomach. This decreases the size of the passage in the stomach and restricts the movement of food.
Over a period of time, restriction is increased until patients feel they have reached a “sweet spot” where optimal weight loss can be reached with the minimal fluid required. This is an individual experience and timing cannot be predicted. There are approximately 7 - 8 adjustable bands on the market. The amount of fluid required and total content varies.
If considering pregnancy, ideally the patient should be in optimum nutritional condition prior to conception; deflation of the band may be required prior to planned conception. Deflation should also be considered should morning sickness be present. The band may remain deflated during pregnancy and once breast feeding is completed, or if bottle feeding, the band may be gradually re-inflated to aid postpartum weight loss if needed.
Gastric band placement, unlike traditional malabsorptive weight loss surgery (e.g. Roux-en-Y gastric bypass surgery (RNY), Biliopancreatic Diversion (BPD) and Duodenal Switch (DS)), does not cut or remove any part of the digestive system. Removal would require a keyhole procedure and the stomach usually returns to its normal pre-banded state. Unlike those who have procedures such as RNY, DS, or BPD, it is unusual for gastric band patients to experience any nutritional deficiencies or malabsorption of micro nutrients. Calcium supplements and Vitamin B12 injections are not routinely required following Gastric banding (as they are with e.g. RNY). Gastric dumping syndrome issues also do not occur since no intestines are removed or re-routed.
Initial weight loss is slower than with RNY; however, statistics indicate that over a 5-year period the weight loss outcome is similar. Weight regain is possible with ANY weight loss procedures including the more radical procedures that initially result in rapid weight loss. The World Health Organisation recommendation for monthly weight loss is ½ to 1 kilograms per week and an ‘average’ banded patient may lose this amount. Clearly this is variable based on the individual and their personal circumstances, motivation, and mobility.
A common reported occurrence for banded patients is regurgitation of non-acidic swallowed food from the upper pouch, commonly known as PB’ing (Productive Burping). Productive Burping is not to be considered normal. The patient should consider eating less, eating more slowly, or chewing their food more thoroughly. Occasionally, the narrow passage into the larger / lower part of the stomach may become blocked by a large portion of unchewed or unsuitable foodstuff.
Further potential complications include:
The psychological effects of any weight loss procedure also should not be ignored.
History of the procedure and device
The first gastric band was patented in 1985 by Obtech Medical of Sweden (now owned by J&J/Ethicon Endo-Surgery) and is known as the Realize Band or Swedish Adjustable Gastric Band (SAGB). An American company, INAMED Health (now owned by Allergan), later designed the BioEnterics® LAP-BAND® Adjustable Gastric Banding System, which was introduced in Europe in 1993. The Swedish band required a laparotomy to install; the LAP-BAND, however, could be performed via a much less invasive laparoscopic procedure. In addition, the SAGB did not have a self-closing mechanism and thus had to be sutured closed. The LAP-BAND System received Food and Drug Administration approval for use in the United States in June 2001. In 2000, a lower pressure, wider and one-piece adjustable gastric band, the MIDband®, was used in Lyon, France . Unlike many of the early bands, the MIDband® was designed specifically for laparoscopic insertion. It has swiftly become one of the leading bands placed in France. There are now many band manufacturers (approx. 7-8 in total).
In general, gastric banding is indicated for people for whom all of the following apply:
It is usually contraindicated for people with any of the following:
Benefits of gastric banding when compared to other bariatric surgeries
Losing weight after surgery
Correct and sensitive adjustment of the band is imperative for weight loss and the long term success of the procedure. Adjustments (also called "fills") may be performed using an X-ray fluoroscope so that the radiologist may assess the placement of the band, the port and the tubing that runs between the port and the band. The patient is given a small cup of liquid that contains a radio-opaque fluid similar to barium—clear or white. When swallowed, the fluid is clearly shown on X–ray and is watched as it travels down the esophagus and through the restriction caused by the band. The radiologist is then able to see the level of restriction in the band and to assess if there are potential or developing issues of concern. These may include dilation of the esophagus, an enlarged pouch, prolapsed stomach (when part of the stomach moves into the band where it does not belong), erosion or migration. Reflux type symptoms may indicate too great a restriction and further investigation may be required. In some circumstances fluid is removed from the band prior to further investigation and re-evaluation. In some cases further surgery may be required (e.g. removal of the band) should gastric erosion or similar be detected.
Some health practitioners adjust the band without the use of X-ray control (fluoroscopy). For example, this is standard practice in the main bariatric surgery clinic in Melbourne, Australia, where AGB placement has been performed for more than ten years. Some UK services, such as Bristol, also do non-fluoroscopic adjustments. In these cases, patients visiting for a regular fill adjustment will typically find they will spend more time talking about the adjustment and their progress than the actual fill itself, which generally will only take about one to two minutes.
For some patients this type of fill is not possible, due to issues such as partial rotation of the port, or excess tissue above the port making it difficult to determine its precise location. In these cases, a fluoroscope will generally be used.
No accurate number of adjustments required can be given. However, an average may be estimated to be between three and five fills (where saline/isotonic solution is inserted into the band via the subcutaneous port) for a person to reach the optimal restriction for weight loss. The amount of saline/isotonic solution needed in the band varies from patient to patient. There are a small number of people who find they do not need a fill at all and have sufficient restriction immediately following surgery. Others may need significant adjustments to the maximum the band is able to hold. Bands come in several diameters and sizes and can hold a total of between 4 cc (ml) to 12 cc (ml) of fill fluid depending on the design. Band size is usually determined by personal preference of the surgeon who places the band together with what s/he is either able to use (e.g., specific bands approved in country of surgery) or what s/he believes to be the most appropriate. In Europe, for example, it is possible for the surgeon to use many designs. The size of the band used is determined by the surgeon during surgery based on the size and thickness of the patient's stomach.
It is more common practice for the band not to be filled at surgery—although some surgeons choose to place a small amount in the band at the time of surgery. The stomach tends to swell following surgery and it is possible that too great a restriction would be achieved if filled at at that time. Clearly, this is undesirable.
The patient may be prescribed a liquid-only diet, followed by mushy foods and then solids. This is prescribed for a varied length of time and each surgeon and manufacturer varies. Some may find that before their first fill that they are still able to eat fairly large portions. This is not surprising since before the fill there is little or no restriction and this is why a proper post-op diet and a good after-care plan is essential to success. Many health practitioners make the first adjustment between 6 – 8 weeks post operatively to allow the stomach time to heal. After that, fills are performed as needed. Some practitioners may be more aggressive than others, but most appear to require a 2 – 4 week wait between fills. It is very important to discuss post-surgical care and diet plans with your weight loss team if you are considering this surgery. Recommendations can vary dramatically from team to team and it is important to find a weight loss team with a good post-surgical plan. Some teams offer support groups, but unfortunately many of them mix RNY and gastric bypass patients with gastric banding patients. Some gastric band patients have criticized this approach because while many of the underlying issues related to obesity are the same, the needs and challenges of the two groups are very different, as are their early rates of weight loss. Some gastric band recipients feel the procedure is a failure when they see that RNY patients generally lose weight faster.
The average gastric banding patient loses 500 grams to a kilogram (1-2 pounds) per week consistently, but heavier patients often lose faster in the beginning. This comes to roughly 50 to 100 pounds the first year for most band patients. It is important to keep in mind that while they drop the weight faster in the beginning, most of the RNY patients will have the same percentage of excess weight loss and comparable ability to keep it off after only a couple of years. Gastric banding patients may have to work a little harder in the first couple of years, but the procedure tends to encourage better eating habits which, in turn, helps in producing long term weight stability.
A systematic review concluded "LAGB has been shown to produce a significant loss of excess weight while maintaining low rates of short-term complications and reducing obesity-related comorbidities. LAGB may not result in the most weight loss but it may be an option for bariatric patients who prefer or who are better suited to undergo less invasive and reversible surgery with lower perioperative complication rates. One caution with LAGB is the uncertainty about whether the low complication rate extends past three years, given a possibility of increased band-related complications (e.g., erosion, slippage) requiring re-operation".
Other positive effects of gastric banding
Effects on Depression
Two groups of 600 overweight patients, each over 40kg/m², were closely watched for 5 years. Both groups had about 29% depressive patients. After 6 months, both groups of patients were less depressed. After 5 years, the number of depressive patients in the non-operated control group had returned to its origin, while members of the operated group were noticeably less depressed.
Quality of Sleep
About 38% of gravely overweight women and 48% of overweight men are suffering from severe sleep apnea. An Australian study  is now trying to show that a gastric band operation can have a positive effect on the sleep apnea. Since weight loss generally has a good effect on sleep apnea, and the gastric band usually leads to weight loss, chances are that the gastric band has a positive effect on sleep apnea, reducing the tiredness during the day and therefore increasing the work-performance of the patient.
The LAP-BAND in Australia
According to an August 2006 article in The Medical Journal of Australia , over 90% of weight loss surgeries in Australia are installations of the laparoscopic adjustable gastric band. Some of the more interesting findings in the study are these:
Our group has treated more than 2700 severely obese patients with the LAGB procedure since 1994 without a single perioperative death. In contrast, mortality from RYGB is reported at between 0 and 5%, with the ASERNIP-S systematic review showing a mean short-term mortality rate of 0.5% — ten times the risk of LAGB. [...]
All bariatric procedures have been able to achieve loss of more than 50% of excess weight. The ASERNIP-S systematic review showed greater weight loss after RYGB than LAGB during the first 2 years after the procedure, but the difference in weight loss was not significant at 3 and 4 years. In a recent review, we extended the data of the ASERNIP-S review by including all studies that included at least 50 patients, reported up to March 2004. This showed a substantial weight loss after both procedures, with an initial greater weight loss after RYGB but similar effectiveness for both procedures at 4, 5 and 6 years.
Documented adverse effects
From the FDA website
Band- and port-specific
Body as a whole
As with many developments in approaches to weight loss, some high-profile and well-publicized cases amongst celebrities have increased the public awareness of gastric banding:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Adjustable_gastric_band". A list of authors is available in Wikipedia.|