The Vertical Sleeve Gastrectomy procedure (also called Sleeve Gastrectomy, Vertical Gastrectomy, Greater Curvature Gastrectomy, Parietal Gastrectomy, Gastric Reduction, Logitudinal Gastrectomy and even Vertical Gastroplasty) is performed by approximately 20 surgeons worldwide. This forum is titled “VSG forum” to include the two most common terms for the procedure (vertical and sleeve). The earliest forms of this procedure were conceived of by Dr. Jamieson in Australia (Long Vertical Gastroplasty, Obesity Surgery 1993)- and by Dr. Johnston in England in 1996 (Magenstrasse and Mill operation- Obesity Surgery 2003). Dr Gagner in New York, refined the operation to include gastrectomy(removal of stomach) and offered it to high risk patients in 2001. Several surgeons worldwide have adopted the procedure and have offered it to low BMI and low risk patients as an alternative to laparoscopic banding of the stomach.
It generates weight loss by restricting the amount of food (and therefore calories) that can be eaten by removing 85% or more of the stomach without bypassing the intestines or causing any gastrointestinal malabsorption. It is a purely restrictive operation. It is currently indicated as an alternative to the Lap-Band® procedure for low weight individuals and as a safe option for higher weight individuals.
This procedure generates weight loss solely through gastric restriction (reduced stomach volume). The stomach is restricted by stapling and dividing it vertically and removing more than 85% of it. This part of the procedure is not reversible. The stomach that remains is shaped like a very slim banana and measures from 1-5 ounces (30-150cc), depending on the surgeon performing the procedure. The nerves to the stomach and the outlet valve (pylorus) remain intact with the idea of preserving the functions of the stomach while drastically reducing the volume. By comparison, in a Roux-en-Y gastric bypass, the stomach is divided, not removed, and the pylorus is excluded. The Roux-en-Y gastric bypass stomach can be reconnected (reversed) if necessary. Note that there is no intestinal bypass with this procedure, only stomach reduction. The lack of an intestinal bypass avoids potentially costly, long term complications such as marginal ulcers, vitamin deficiencies and intestinal obstructions.
Comparison to prior Gastroplasties (stomach stapling of the 70-80s)
The Vertical Gastrectomy is a significant improvement over prior gastroplasty procedures for a number of reasons:
1) Rather than creating a pouch with silastic rings or polypropylene mesh, the VG actually resects or removes the majority of the stomach. The portion of the stomach which is removed is responsible for secreting Ghrelin, which is a hormone that is responsible for appetite and hunger. By removing this portion of the stomach rather than leaving it in-place, the level of Ghrelin is reduced to near zero, actually causing loss of or a reduction in appetite (Obesity Surgery, 15, 1024-1029, 2005). Currently, it is not known if Ghrelin levels increase again after one to two years. Patients do report that some hunger and cravings do slowly return. An excellent study by Dr. Himpens in Belgium(Obesity Surgery 2006) demonstrated that the cravings in a VSG patient 3 years after surgery are much less than in LapBand patients and this probably accounts for the superior weight loss.
2) The removed section of the stomach is actually the portion that “stretches” the most. The long vertical tube shaped stomach that remains is the portion least likely to expand over time and it creates significant resistance to volumes of food. Remember, resistance is greatest the smaller the diameter and the longer the channel. Not only is appetite reduced, but very small amounts of food generate early and lasting satiety(fullness).
3) Finally, by not having silastic rings or mesh wrapped around the stomach, the problems which are associated with these items are eliminated (infection, obstruction, erosion, and the need for synthetic materials). An additional discussion based on choice of procedures is below.
Alternative to a Roux-en-Y Gastric Bypass
The Vertical Gastrectomy is a reasonable alternative to a Roux en Y Gastric Bypass for a number of reasons
- Because there is no intestinal bypass, the risk of malabsorptive complications such as vitamin deficiency and protein deficiency is minimal.
- There is no risk of marginal ulcer which occurs in over 2% of Roux en Y Gastric Bypass patients.
- The pylorus is preserved so dumping syndrome does not occur or is minimal.
- There is no intestinal obstruction since there is no intestinal bypass.
- It is relatively easy to modify to an alternative procedure should weight loss be inadequate or weight regain occur.
- The limited two year and 6 year weight loss data available to date is superior to current Banding and comparable to Gastric Bypass weight loss data(see Lee, Jossart, Cirangle Surgical Endoscopy 2007).
First stage of a Duodenal Switch
In 2001, Dr. Gagner performed the VSG laparoscopically in a group of very high BMI patients to try to reduce the overall risk of weight loss surgery. This was considered the ‘first stage’ of the Duodenal Switch procedure. Once a patient’s BMI goes above 60kg/m2, it is increasingly difficult to safely perform a Roux-en-Y gastric bypass or a Duodenal Switch using the laparoscopic approach. Morbidly obese patients who undergo the laparoscopic approach do better overall in their recovery, while minimizing pain and wound complications, when compared to patients who undergo large, open incisions for surgery (Annals of Surgery, 234 (3): pp 279-291, 2001). In addition, the Roux-en-Y gastric bypass tends to yield inadequate weight loss for patients with a BMI greater than 55kg/m2 (Annals of Surgery, 231(4): pp 524-528. The Duodenal Switch is very effective for high BMI patients but unfortunately it can also be quite risky and may be safer if done open in these patients. The solution was to ‘stage’ the procedure for the high BMI patients.
The VSG is a reasonable solution to this problem. It can usually be done laparoscopically even in patients weighing over 500 pounds. The stomach restriction that occurs allows these patients to lose more than 100 pounds. This dramatic weight loss allows significant improvement in health and resolution of associated medical problems such as diabetes and sleep apnea, and therefore effectively “downstages” a patient to a lower risk group. Once the patients BMI is lower (35-40) they can return to the operating room for the “second stage” of the procedure, which can either be the Duodenal Switch, Roux–en-Y gastric bypass or even a Lap-Band®. Current, but limited, data for this ‘two stage’ approach indicate adequate weight loss and fewer complications.