Gastrectomy

Definition

Gastrectomy is the surgical removal of all or part of the stomach.

Purpose

Gastrectomy is performed most commonly to treat the following conditions:

• stomach cancer
• bleeding gastric ulcer
• perforation of the stomach wall
• noncancerous polyps

Demographics

Stomach cancer was the most common form of cancer worldwide in the 1970s and early 1980s, and the incidence rates have always shown substantial variation in different countries. Rates are currently highest in Japan and eastern Asia, but other areas of the world have high incidence rates, including Eastern European countries and parts of Latin America. Incidence rates are generally lower in Western Europe and the United States.

Gastrointestinal diseases (including gastric ulcers) affect an estimated 25–30% of the world's population. In the United States, 60 million adults experience gastrointestinal reflux at least once a month, and 25 million adults suffer daily from heartburn, a condition that may evolve into ulcers.

Description

Gastrectomy for cancer

Removal of the tumor, often with removal of the surrounding lymph nodes, is the only curative treatment for various forms of gastric (stomach) cancer. For many patients, this entails removing not only the tumor, but part of the stomach as well. The extent to which lymph nodes should also be removed is a subject of debate, but some studies show additional survival benefits associated with removal of a greater number of lymph nodes.

Gastrectomy, either total or subtotal (also called partial), is the treatment of choice for gastric adenocarcinomas, primary gastric lymphomas (originating in the stomach), and the rare leiomyosarcomas (also called gastric sarcomas). Adenocarcinomas are by far the most common form of stomach cancer and are less curable than the relatively uncommon lymphomas, for which gastrectomy offers good chances of survival.

General anesthesia is used to ensure that the patient does not experience pain and is not conscious during the operation. When the anesthesia has taken hold, a urinary catheter is usually inserted to monitor urine output. A thin nasogastric tube is inserted from the nose down into the stomach. The abdomen is cleansed with an antiseptic solution. The surgeon makes a large incision from just below the breastbone down to the navel. If the lower end of the stomach is diseased, the surgeon places clamps on either end of the area, and that portion is excised. The upper part of the stomach is then attached to the small intestine. If the upper end of the stomach is diseased, the end of the esophagus and the upper part of the stomach are clamped together. The diseased part is removed, and the lower part of the stomach is attached to the esophagus.

After gastrectomy, the surgeon may reconstruct the altered portions of the digestive tract so that it may continue to function. Several different surgical techniques are used, but, generally speaking, the surgeon attaches any remaining portion of the stomach to the small intestine.

Gastrectomy for gastric cancer is almost always done using the traditional open surgery technique, which requires a wide incision to open the abdomen. However, some surgeons use a laparoscopic technique that requires only a small incision. The laparoscope is connected to a tiny video camera that projects a picture of the abdominal contents onto a monitor for the surgeon's viewing. The stomach is operated on through this incision.

The potential benefits of laparoscopic surgery include less postoperative pain, decreased hospitalization, and earlier return to normal activities. The use of laparoscopic gastrectomy is limited, however. Only patients with early-stage gastric cancers or those whose surgery is intended only for palliation (pain and symptomatic relief rather than cure) are considered for this minimally invasive technique. It can only be performed by surgeons experienced in this type of surgery.

Gastrectomy for ulcers

Gastrectomy is also occasionally used in the treatment of severe peptic ulcer disease or its complications. While the vast majority of peptic ulcers (gastric ulcers in the stomach or duodenal ulcers in the duodenum) are managed with medication, partial gastrectomy is sometimes required for peptic ulcer patients who have complications. These include patients who do not respond satisfactorily to medical therapy; those who develop a bleeding or perforated ulcer; and those who develop pyloric obstruction, a blockage to the exit from the stomach.

The surgical procedure for severe ulcer disease is also called an antrectomy , a limited form of gastrectomy in which the antrum, a portion of the stomach, is removed. For duodenal ulcers, antrectomy may be combined with other surgical procedures that are aimed at reducing the secretion of gastric acid, which is associated with ulcer formation. This additional surgery is commonly a vagotomy , surgery on the vagus nerve that disables the acid-producing portion of the stomach.

Diagnosis/Preparation

Before undergoing gastrectomy, patients require a variety of such tests as x rays, computed tomography (CT) scans, ultrasonography, or endoscopic biopsies (microscopic examination of tissue) to confirm the diagnosis and localize the tumor or ulcer. Laparoscopy may be done to diagnose a malignancy or to determine the extent of a tumor that is already diagnosed. When a tumor is strongly suspected, laparoscopy is often performed immediately before the surgery to remove the tumor; this method avoids the need to anesthetize the patient twice and sometimes avoids the need for surgery altogether if the tumor found on laparoscopy is deemed inoperable.

Aftercare

After gastrectomy surgery, patients are taken to the recovery unit and vital signs are closely monitored by

the nursing staff until the anesthesia wears off. Patients commonly feel pain from the incision, and pain medication is prescribed to provide relief, usually delivered intravenously. Upon waking from anesthesia, patients have an intravenous line, a urinary catheter, and a nasogastric tube in place. They cannot eat or drink immediately following surgery. In some cases, oxygen is delivered through a mask that fits over the mouth and nose. The nasogastric tube is attached to intermittent suction to keep the stomach empty. If the whole stomach has been removed, the tube goes directly to the small intestine and remains in place until bowel function returns, which can take two to three days and is monitored by listening with a stethoscope for bowel sounds. A bowel movement is also a sign of healing. When bowel sounds return, the patient can drink clear liquids. If the liquids are tolerated, the nasogastric tube is removed and the diet is gradually changed from liquids to soft foods, and then to more solid foods. Dietary adjustments may be necessary, as certain foods may now be difficult to digest. Overall, gastrectomy surgery usually requires a recuperation time of several weeks.

Risks

Surgery for peptic ulcer is effective, but it may result in a variety of postoperative complications. Following gastrectomy surgery, as many as 30% of patients have significant symptoms. An operation called highly selective vagotomy is now preferred for ulcer management, and is safer than gastrectomy.

After a gastrectomy, several abnormalities may develop that produce symptoms related to food intake. They happen largely because the stomach, which serves as a food reservoir, has been reduced in its capacity by the surgery. Other surgical procedures that often accompany gastrectomy for ulcer disease can also contribute to later symptoms. These procedures include vagotomy, which lessens acid production and slows stomach emptying; and pyloroplasty , which enlarges the opening between the stomach and small intestine to facilitate emptying of the stomach.

Some patients experience lightheadedness, heart palpitations or racing heart, sweating, and nausea and vomiting after a meal. These may be symptoms of "dumping syndrome," as food is rapidly dumped into the small intestine from the stomach. Dumping syndrome is treated by adjusting the diet and pattern of eating, for example, eating smaller, more frequent meals and limiting liquids.

Patients who have abdominal bloating and pain after eating, frequently followed by nausea and vomiting, may have what is called the "afferent loop syndrome." This is treated by surgical correction. Patients who have early satiety (feeling of fullness after eating), abdominal discomfort, and vomiting may have bile reflux gastritis (also called bilious vomiting), which is also surgically correctable. Many patients also experience weight loss.

Reactive hypoglycemia is a condition that results when blood sugar levels become too high after a meal, stimulating the release of insulin, occurring about two hours after eating. A high-protein diet and smaller meals are advised.

Ulcers recur in a small percentage of patients after surgery for peptic ulcer, usually in the first few years. Further surgery is usually necessary.

Vitamin and mineral supplementation is necessary after gastrectomy to correct certain deficiencies, especially vitamin B ₁₂ , iron, and folate. Vitamin D and calcium are also needed to prevent and treat the bone problems that often occur. These include softening and bending of the bones, which can produce pain and osteoporosis, a loss of bone mass. According to one study, the risk for spinal fractures may be as high as 50% after gastrectomy.

Normal results

Overall survival after gastrectomy for gastric cancer varies greatly by the stage of disease at the time of surgery. For early gastric cancer, the five-year survival rate is as high as 80–90%; for late-stage disease, the prognosis is bad. For gastric adenocarcinomas that are amenable to gastrectomy, the five-year survival rate is 10–30%, depending on the location of the tumor. The prognosis for patients with gastric lymphoma is better, with five-year survival rates reported at 40–60%.

Most studies have shown that patients can have an acceptable quality of life after gastrectomy for a potentially curable gastric cancer. Many patients will maintain a healthy appetite and eat a normal diet. Others may lose weight and not enjoy meals as much. Some studies show that patients who have total gastrectomies have more disease-related or treatment-related symptoms after surgery and poorer physical function than patients who have subtotal gastrectomies. There does not appear to be much difference, however, in emotional status or social activity level between patients who have undergone total versus subtotal gastrectomies.

Morbidity and mortality rates

Depending on the extent of surgery, the risk for postoperative death after gastrectomy for gastric cancer has been reported as 1–3% and the risk of non-fatal complications as 9–18%. Overall, gastric cancer incidence and mortality rates have been declining for several decades in most areas of the world.

Resources

BOOKS

"Disorders of the Stomach and Duodenum." In The Merck Manual. Whitehouse Station, NJ: Merck & Co., Inc., 1992.

"Stomach and Duodenum: Complications of Surgery for Peptic Ulcer Disease." In Sleisenger & Fordtran's Gastrointestinal and Liver Disease, edited by Mark Feldman et al. Philadelphia: W. B. Saunders Co., 1998.

PERIODICALS

Fujiwara, M., et al. "Laparoscopy-Assisted Distal Gastrectomy with Systemic Lymph Node Dissection for Early Gastric Carcinoma: A Review of 43 Cases." Journal of the American College of Surgeons 196 (January 2003): 75–81.

Iseki, J., et al. "Feasibility of Central Gastrectomy for Gastric Cancer." Surgery 133 (January 2003): 75–81.

Kim, Y. W., H. S. Han, and G. D. Fleischer. "Hand-Assisted Laparoscopic Total Gastrectomy." Surgical Laparoscopy, Endoscopy & Percutaneous Techniques 13 (February 2003): 26–30.

Kono, K., et al. "Improved Quality of Life with Jejunal Pouch Reconstruction after Total Gastrectomy." American Journal of Surgery 185 (February 2003): 150–154.

ORGANIZATIONS

American College of Gastroenterology. 4900-B South 31st St., Arlington, VA 22206. (703) 820-7400. http://www.acg.gi.org .

American Gastroenterological Association (AGA). 4930 Del Ray Avenue, Bethesda, MD 20814. (301) 654-2055. http://www.gastro.org .

OTHER

Mayo Clinic Online: Gastrectomy. http://www.mayohealth.com .

Caroline A. Helwick
Monique Laberge, PhD

WHO PERFORMS THE PROCEDURE AND WHERE IS IT PERFORMED?

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A gastrectomy is performed by a surgeon trained in gastroenterology, the branch of medicine that deals with the diseases of the digestive tract. An anesthesiologist is responsible for administering anesthesia, and the operation is performed in a hospital setting.

QUESTIONS TO ASK THE DOCTOR

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• What happens on the day of surgery?
• What type of anesthesia will be used?
• How long will it take to recover from the surgery?
• When can I expect to return to work and/or resume normal activities?
• What are the risks associated with a gastrectomy?
• How many gastrectomies do you perform in a year?
• Will there be a scar?