Gastrectomy for benign lesions: classic partial gastrectomy, variation: antrectomy
Operating room set up, position of patient and equipment, instruments used are thoroughly described. The technical key steps of the surgical procedure are presented in a step by step way: surgical approach, principles, mobilization of greater curvature, mobilization/transection, gastrojejunal anastomosis, gastroduodenal anastomosis, difficult duodenums, freeing of the curvature, transection of the stomach, restoration/continuity, Billroth I anastomosis, Billroth II anastomosis.
Consequently, this operating technique is well standardized for the management of this condition.
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Gastrectomy for benign lesions: classic partial gastrectomy, variation: antrectomy
A significant decrease in the indications for gastrectomy has been observed in Western countries due to:
- the practice of vagotomy;
- the administration of anti-ulcer medications such as H2-blockers, proton pump inhibitors (PPI);
- the eradication of Helicobacter pylori with antibiotics.
Today, therapeutic failure for gastric ulcers is seen in less than 5% of the cases and gastrectomy represents less than 1% of surgical interventions for gastric ulcers.
Surgery is only indicated in patients who either do not respond to medical therapy or have a poor compliance record (Michot and Fraleu-Louer, 1996). Other indications are benign tumors and/or certain functional disorders.
Gastrectomy may be performed via the open approach and, more recently, via the laparoscopic approach.
The line of transection through the stomach is oblique.
It starts on the lesser curvature 2 fingerbreadths (4 cm) below the cardia at the level of the left gastric artery to finish at the level of the first short gastric vessel located in the avascular zone of the greater curvature.
It starts one fingerbreadth (2 cm) above the angulus (junction between the horizontal and vertical regions of the lesser curvature), to finish on the midpoint of the gastroepiploic artery of the greater curvature.
- with a gastroduodenal anastomosis (performed manually or by a mechanical stapler),
or
- with a gastrojejunal anastomosis where the remaining gastric stump is united to the first jejunal loop (as above).
1. the cardia: junction between the abdominal esophagus and stomach,
2. the pylorus: junction between the stomach and duodenum.
3. the vertical part inclines over the vertebral column to the left and is composed of both the fundus and the body of the stomach;
4. the horizontal part heads to the right beyond the linea alba.
5. the first mobile segment of duodenum. It is separated from the pancreas by the omental bursa, which extends from the right to the gastroduodenal artery.
6. a gastrin-producing zone called the antrum,
7. the fundus.
The junction between these functional regions does not correspond to the junction between the horizontal and vertical regions of the stomach.
It divides into 4 pedicles, 2 each at the level of the:
1. lesser curvature,
2. greater curvature.
The pedicles then join a wide anastomotic network that supplants vascular blood supply when one of the main trunks is either obstructed or ligated.
It originates from the anterior aspect of the aorta above the superior aspect of the pancreas.
The trunk is 1 to 3 cm long and divides into 3 branches:
1. the left gastric artery;
2. the common hepatic artery;
3. the splenic artery.
1. directly from the aorta;
2. from the inferior phrenic artery;
3. from the gastrosplenic trunk;
4. from the gastrohepatic trunk.
1. the hepatic artery (present and functional in 30% of cases);
2. the anterior and posterior cardioesophageal arteries (that supply the cardia and abdominal esophagus).
1. the gastroduodenal arteries;
2. the left hepatic artery;
3. the proper hepatic artery.
The right and left gastric arteries comprise the vascular arch of the lesser curvature.
1. originates from the division of the gastroduodenal artery at the inferior aspect of the duodenum;
2. runs along the greater curvature of the stomach from right to left at an average distance of 1 cm;
3. the branches originating from the right gastroepiploic artery run along the anterior and posterior aspects of the stomach and into the omentum.
The right and left gastroepiploic arteries thus form the vascular arch of the greater curvature.
Alternatively, they originate directly from the trunk of the splenic artery or from its terminal branches.
There are 2 to 6 vessels that run from the splenic hilum to the stomach via the gastrosplenic omentum.
The largest vessel – the posterior gastric artery – joins the posterior aspect of the stomach and divides to supply the fundus and the cardia.
The patient is administered antibiotic prophylaxis (systematically) and put in supine position.
A nasogastric tube is inserted to fully decompress the stomach.
Padding (preferably inflatable) is set underneath the patient to obtain better exposure of the intra-abdominal anatomy. The operating table may be bent posteriorly at the level of the inferior angle of the scapula in order to obtain the same result. This angle must be straightened before parietal closure, at the end of the procedure.
2. The first assistant stands opposite the surgeon.
3. The second assistant stands on the surgeon’s left.
4. The scrub nurse stands opposite the surgeon and on the first assistant’s left.
5. The anesthesiologist is at the head of the patient.
2. Electric device
3. Operating table
4. Instrument table
The upper part of the abdominal incision clearly reveals the xiphoid process and provides good visualization of the upper part of the stomach. In obese patients, the inferior part of the abdominal incision extends slightly to the left of the umbilicus. The round ligament remains undisturbed to facilitate exposure.
The parietal wall is protected using a plastic “skirt” and a “Gosset” abdominal retractor.
Subcostal retraction is not necessary.
2. Dissection of the duodenum
- Billroth II operation (closed duodenal stump)
- Billroth I operation (opened duodenal stump)
3. Dissection of the lesser curvature
4. Transection of the stomach
5. Restoration of the gastrointestinal tract continuity
- Billroth II anastomosis
- Billroth I anastomosis
The stomach is retracted cephalad using either 1 or 2 Babcock clamps or a gauze pad to prevent the organ from slipping.
The transverse colon is lifted up slightly, to expose the vessels between itself and the stomach.
The posterior adhesions between the stomach to the pancreas are dissected to the right down to the pylorus using an electrocautery device.
To perform an antrectomy (without vagotomy), the dissection only extends up to the middle part of the gastroepiploic arch.
In this case, the vascular arch - supplied by the left gastroepiploic artery - must be preserved since it will be supplying the remainder of the body of the stomach.
The posterior adhesions of the pylorus are preferably transected using an Argon electrical device since it guaranties hemostasis and thus obviates having to perform numerous ligatures of the fine venous networks.
The right gastroepiploic vein that joins the gastrocolic trunk is ligated.
Care must be taken to preserve the right gastroepiploic artery.
The pars flaccida of the lesser omentum is incised down to the pylorus. This allows passage of the left hand behind the pylorus for better exposure. It allows:
- the dissection and ligature of the right gastric artery that runs along the pylorus thus presented (pyloric artery),
- the preservation of the hepatic artery, posteriorly.
The ligature or electrocauterization of 1 or 2 small supraduodenal vessels completes the dissection of the mobile duodenum.
The gastroduodenal artery constitutes the lateral landmark for the dissection of the duodenal bulb.
b. In the gastroduodenal anastomosis, the duodenal stump must be preserved.
In certain cases, the duodenal stump cannot be utilized for an anastomosis, nor can it be adequately closed.
If a gastrojejunal anastomosis is intended, the duodenal stump is closed.
The stapler achieves hemostasis, water-tightness and duodenal transection, and avoids contamination of the operative field since the organ is not opened.
Two rigid right-angled clamps are applied on both sides of the transection line. An interrupted or extra-mucosal running suture is performed to close the stump.
Most authors further bury the suture line by applying a second row of interrupted sutures or fashioning a purse-string closure. In this case, the duodenal wall must be at least 2.5 cm long (which is more than that required for the use of a stapling device).
Although the rate of postoperative fistulas is low (about 4.5% according to Kyzer et al. 1997), extreme care must be taken to prevent this grave type of surgical complication.
Fibrin glue can be used to reinforce suturing.
No study has demonstrated so far that the rate of postoperative fistulas significantly decreases when fibrin glue is used.
A healthy duodenal stump must be preserved.
Anastomosis of the gastric and duodenal segments must be tension-free.
Posterior adhesions of both the duodenum and pancreas must be detached before performing the anastomosis (Kocher maneuver) in order to gain a few millimeters.
An automatic linear stapler can be placed 1cm above the transection area. The stapled fragment is transected a second time just before proceeding to the anastomosis.
A circular stapler can be used for the gastroduodenal anastomosis to help fashion a purse-string type closure. The duodenal stump is transected and the anvil of the circular stapler set in place (see Billroth I anastomosis, step 17).
Preservation of the pylorus and vagal nerve in the anastomosis is thought to reduce the functional sequelae caused by gastrectomy. Yet this type of surgery is rarely practiced (Yunfu et al., 1998).
Peptic ulcer development posterior to the duodenum affects the pancreas, the common bile duct and the accessory pancreatic duct. The sclerosis provoked by the ulceration process results in the destruction of the plane of dissection between the duodenum and the common bile duct. Transection of the duodenum may therefore injure the biliary tract.
When the duodenum is unhealthy and/or the duodenal segment is too short, it may be impossible to utilize a linear stapler to transect both walls of the duodenum. In such cases, transverse interrupted sutures may be applied to close the duodenum.
When it is impossible to dissect the posterior aspect of the duodenum, interrupted sutures are applied longitudinally.
When it is impossible to apply secure sutures to the duodenum, a duodenostomy must be performed with the use of a probe. Three to four centimetres of a multi-perforated or “Pezzer” rubber catheter are introduced into the lumen of the duodenal stump. The stump is closed around the catheter with a running suture line or a purse-string closure. A lamina is also placed with the catheter that comes out of the patient’s right flank. The duodenostomy will retrieve 300 to 600mL of liquid per day, be maintained for 8 to 15 days, and then be progressively removed (in most cases, the opening will close by itself).
This ligature allows preservation of:
- a collateral branch of the celiac trunk that heads to the liver;
- the left accessory hepatic artery (or hepatic artery);
- and the “cardio-fundic” branch of the left gastric artery that supplies the cardia of the stomach.
A 90 mm linear stapler using 2.5 mm green staples is applied to the stomach and fired.
An extra cartridge can be used to finish the entire transection line in order to perform the gastric transection in one operative step.
An extra running suture is performed along the staple line to ensure hemostasis.
The serous and muscular planes are gradually incised to expose the submucosal plane with its rich vasculature. A thin 3.0 or 4.0 absorbable suture is used to ligate the submucosal vessels.
The transection line is closed in two planes using interrupted or running absorbable sutures.
- the gastroduodenal anastomosis (Billroth I);
- the gastrojejunal anastomosis (Billroth II).
These procedures, first described in 1881 (Lau & Leow, 1997; Trias et al., 1996), both allow for restoring digestive tract continuity following gastric resection.
They are performed in comparable overall operative times (Kyzer et al., 1997). In the surgical literature, neither technique has been reported as giving better results (as far as secondary complications are concerned).
Secondary complications:
- late occurrence of gastric stump cancer;
- calcium and hormone metabolism alterations;
- hemorrhage;
- reflux;
- cholecystokinin secretion (Kyzer et al., 1997; Oka et al., 1995).
However, this anastomosis may lead to fistula formation which is particularly serious in this area, since it may prevent the patient from resuming normal dietary habits.
The suture line must be tension-free.
Gastrointestinal tract restoration using the Billroth I anastomosis should only be performed after an antrectomy.
The remaining stomach and duodenum are anastomosed manually, starting from the posterior wall, using absorbable sutures.
Danger: Because of the risk of secreting cells remaining in the stomach remnant, the Billroth I anastomosis must be performed in conjunction with a truncal vagotomy.
a. the end-to-side gastroduodenal anastomosis (Von Haberer technique, Patel-Lataste-Noack anastomosis);
b. the anastomosis starting from the right aspect of the stomach;
c. the anastomosis starting from the posterior aspect of the gastric stump using a circular stapler.
A purse-string suture line is fashioned and the duodenal stump is resected. The anvil of the circular stapler is placed into the duodenal lumen and the purse-string tightened. One corner of the staple line resulting from the gastric resection is excised and opened to introduce the circular stapler into the gastric lumen. The posterior aspect of the stomach is perforated by the center of the circular stapler. The anvil is closed and the stapler fired to perform the anastomosis. The orifice created for entry of the circular stapler is closed using a linear stapler.
It is possible to perform the anastomosis with the circular stapler before transecting the stomach. The antrum is preserved. The circular stapler is introduced into the pylorus. The posterior aspect of the stomach is perforated by the center of the circular stapler. The stomach and duodenum are then anastomosed using an automatic stapler before proceeding to the gastric resection (Oka et al., 1995).
The main advantage of this type of anastomosis is that it can be performed regardless of the condition of the duodenum. This procedure is quick and offers good functional results.
Certain general rules should be followed:
- it is preferable to perform a mechanical anastomosis;
- the posterior aspect of the stomach and the first jejunal loop are anastomosed using a side-to-side anastomosis;
- the jejunal loop used for the anastomosis must be only 20 to 40 cm long to preserve the physiology of the digestive tract.
- the anastomosis is antiperistaltic -- the afferent loop is approximated to the lesser curvature of the stomach. The lesser curvature hence becomes the point of entry of the biliopancreatic secretions discharged into the stomach. The secretions clear the gastric pouch at the lowest point of the greater curvature.
- the anastomosis is performed below the mesocolon to prevent loop stricture at that level.
The part of the jejunum chosen for the anastomosis is brought closer to the stomach by using Babcock clamps placed on the staple line under the mesocolic incision.
The posterior fold must be fixed at this point of the operative step since access to this area is impossible once the small bowel is sutured to the stomach.
The stapler is removed and its introduction site is closed with absorbable interrupted sutures or with a 55 mm linear stapler whose opening is triangulated to prevent the staple lines from being in approximation when the stapler is fired.
The anterior fold of the mesocolic opening is closed at stomach level, anterior to the anastomosis. The stomach can, therefore, still move cephalad and the anastomosis will remain in a submesocolic position.
Once the mesocolic opening is fashioned and the posterior fold is sutured, the small bowel is approximated to the stomach. First, a posterior seromuscular running suture is placed to secure the small bowel to the stomach and then both the stomach and the small bowel are opened on either side of the posterior suture line. Next, a through and through, 3.0 absorbable running suture is placed across the stomach (from the lesser curvature to the greater curvature) prior to transection, as a hemostatic measure.
The mesocolon is next sutured to the anterior aspect of the stomach so that the anastomosis always remains in submesocolic position.
The transection line is inspected interiorly prior to closing the anstomosis, to make sure that the transection lines are not bleeding.
1. The gastrojejunal anastomosis can be performed on the posterior aspect of the stomach. The stomach is transected using a 90 mm linear stapler and its posterior aspect approximated to the small bowel (as in an end-to-end anastomosis). The side-to-side anastomosis is performed in 4 ways:
2. Isoperistaltic anastomosis
3. Precolic anastomosis
4. Loop anastomosis forming a Y-shaped pattern
5. Anastomosis to the anterior aspect of the stomach (may impair the functional aspect of the stomach)
Finsterer anastomosis:
This type of anastomosis is also submesocolic.
The main difference between the Finsterer and Billroth II anastomoses concerns the length of the anastomosis. Billroth II anastomosis is an end-to-end anastomosis whereas the Finsterer anastomosis is an end-to-side anastomosis performed on the left part of the gastric transection line. The small bowel is sutured to the corner of the inferior gastric pouch. This creates an angle preventing biliary secretions from discharging into the stomach. It is fashioned by applying 3 to 4 stitches to the anterior and posterior aspects of the stomach and eventually the small bowel.
A drain is placed in the abdominal cavity near the anastomosis.
The nasogastric tube is placed by direct palpation opposite the anastomosis. It is maintained for 2 to 5 days at a low suction (less than 30 mm Hg) before retrieval.
Evaluation of the anastomosis (esogastroduodenal gastrograffin swallow) is recommended before resuming PO intake.
The drain is removed on the fifth postoperative day.
Postoperative management following a Billroth II anastomosis:
Billroth II anastomosis is a particularly safe procedure; anastomotic failures are rare.
Danger:
“Marginal ulcer” associated with hematemesis, melena and possible transitory anemia may be observed after mechanical anastomosis. In some cases, it is necessary to re-operate to complete hemostasis of the resection line (Kyzer et al., 1997).
Conclusion
Today, gastrectomies for benign lesions are rarely performed. Some authors contest their utility. (Witte, 1997; Witte, 1995).
Yet they remain useful for the treatment of gastric ulcers (Lacaine, 1996), especially in areas where the availability of medical treatment is inconsistent and the costs are high (Balafrej et al.). The benefits of this type of procedure must be weighed against the risks of failure which could greatly affect the quality of life of the patient (Gertsch et al. 1996; Jordan & Thornby, 1994), for example, as in the dumping syndrome.
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