腹腔镜Roux-en-Y胃旁路术（RYGB）

Circular vs Linear Stapled Gastro-Jejunostomy in Laparoscopic Bariatric Surgery.

A Review Article
Eleftherios Koulouteris
General Surgeon M.D, F.MAS, D.MAS
                                                                      
ABSTRACT

After the introduction of the laparoscopic Roux-en-Y gastric bypass (RYGB), many articles have validated that it is safe, it can be performed with out many difficulties, and is cost-effective, with decreased morbidity and similar weight loss with respect to the open technique. Advantages of laparoscopic RYGB compare to open technique include reduction of  blood loss during operation, less postoperative pain, decreased pulmonary complication rates, a shorter hospital stay, earlier return to normal activities, and a better quality of life. For these reasons, this technique is becoming popular in surgical society. There are several techniques to perform Roux-en-Y gastric bypass (RYGBP) in Laparoscopic procedures, including hand-sewn and stapled techniques. Today more and more surgeons rely on stapling devices for thegastrojejunal anastomosis (GJA). The aim of this review article is to compare end-to-end anastomosis (EEA) using circular staplers (CSA) with end-to-side anastomosis using linear staplers (LSA) at the level of gastrojejunostomy, taking in consideration all those parameters that may influence the morbidity and mortality (eg. Age, sex, BMI, co-morbitities).There are some advantages favouring one technique over the other, but in general both are feasible and easy to perform in expert hands.   

KEY WARDS

Circular stapler, Linear stapler, Laparoscopy, Bariatric Surgery, Morbid Obesity, Gastrojejunostomy, Roux-en-Y Gastric Bypass

INTRODUCTION                                                                                       

The WHO has declared obesity as the epidemic disease of the twenty-first century. Over than 300 million people worldwide are obese [1]. After bariatric surgery there is a 29% reduction of death regarding long term risk [2]. Laparoscopic Roux-en-Y gastric bypass (RYGB) was introduced in 1994[3]. There are several advantages regarding laparoscopic RYGB vs the open technique. These include reduced lower pulmonary complication rates, shorter hospital stay, less postoperative pain, less operative blood loss, a shorter return to normal activities, and a better quality of life [4,5].However, it is technically a very demanding laparoscopic procedure. Laparoscopic Roux-en-Y gastric bypass (LRYGB) is one of the most common operations for the treatment of morbid obesity. There are early complications regarding the procedure, occurring in 10–30% of patients, especially during the learning period. These are bleeding, anastomotic leak, obstruction and other intra-operative complications such as myocardial ischemia, deep vein thrombosis, pulmonary embolus, etc. Late complications include anastomotic stricture, small bowel obstruction, cholelithiasis, nutritional deficiencies, and inadequate weight loss [6-10]. Several studies suggest that the learning curve includes 100 cases for reaching morbidity rate similar to open procedures, or a significant reduction in morbidity [11-12].

One of the most challenging steps in laparoscopic bariatric surgery is to perform the gastrojejunostomy (GJ).

MATERIAL AND METHODS

There was a review of 21 articles using various search engines including Google, Pubmed, Springer link and Medline. The study was based on the institution where the study was done, the number of cases (>50 cases per article) and exclusion of articles before 2000. The patients were divided into two groups of gastrojejunal anastomotic technique, CSA or LSA, and the results were compared. Operative time, intra-operative complications, hospital stay, major and minor post-operative complications were taken in consideration.

Technique of the procedure

                               
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Patients were mechanically ventilated, using a pressure or a volume controlled setting. Standard physiologic monitoring included pulseoxymetry, electrocardiograph and non-invasive arterial blood pressure. [13,14]. The patient was placed in the supine position, the legs were split with anti- Trendelenburg position and five ports were used [15].

After placing the ports, a division of the stomach, starting 5-6 cm below the gastoesophageal junction was done with a linear stapler, thus creating a 15-30 ml proximal gastric pouch. There was a division of the small intestine 40-60 cm from the ligament of Treitz and the Roux limp was brought near the pouch for the GJA. The Y-limp was anastomosed site by site with the rest of the small intestine using a linear stapler and the enterotomy was closed in two layer hand-sewn suture. The GJA was performed using either circular (25mm) or linear (45mm) stapler [15].

                               
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CSA technique

The CSA was performed by attaching the anvil to a guide wire or tube, and pulling the anvil of a circular stapler through the mouth and esophagus and into the gastric pouch. A gastrotomy was done and the tip of the anvil was then entered into the peritoneal cavity. The circular stapler was introduced through an extended abdominal port site, and then through an enterotomy on the afferent loop it was engaged with the anvil. The stapler was fired forming an end-to-end anastomosis and then withdrawn from the bowel and abdominal cavity. The enterotomy through which the stapler was introduced in the small intestine was then closed using a linear stapler.

  

                               
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LSA technique

The LSA was performed after the creation of an enterotomy of the Roux limp and a gastrotomy of the pouch. Then the legs of the linear stapler were introduced and the stapler was fired thus creating an end-to-site anastomosis. The resultant common enterotomy was closed with a 2-layer hand-sewn suture.

After the completion of the GJA, a test was performed, using either methylene blue or air, to see the integrity of the anastomosis.

                               
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RESULTS

By reviewing the results of all articles some very interesting findings were detected. Blood loss was comparative the same between the two groups. The operative time was shorter in LSA group. The percentage of intra-operative complication was similar. The incidence of wound infection was higher in CSA group and there was a higher percentage of anastomotic strictures in the same group. Overall, there was no statistical difference regarding the post-operative complications between the two groups. There was no significant difference concerning the length of stay and the hospital costs between the two techniques. Weight loss was similar in the two groups.  

DISCUSION

The LRYGB is considered nowadays as the golden standard in bariatric surgery. Nevertheless, it is a challenging procedure with a significant morbidity and mortality despite the increasing surgical experience of this procedure.

Buchwald et al. in a meta-analysis has reported a mortality rate of 0.16% for LRYGB [16]. Flum et.  al stated that increasing age, male sex, and non-expert surgeon are associated with a higher risk of early death after bariatric surgery [17]. The most critical post-operative complication is leak which is the most important cause of surgical related mortality resulting in peritonitis, sepsis and MOF. Male, re-do surgery, older age, a BMI >50 kg/m2 and surgeon experience are all related with poor outcome and a greater leakage rate [18,19]. The most frequent site for an anastomotic leak is the gastrojejunostomy[19]. There are several studies reporting an overall leakage rate ranging from 0.1% to 5.25% [19-30]. In a review of 6,135 patients in 13 selected series of laparoscopic RYGB, the mean leakage rate was 1.4% (range 0–4.3) [19]. The methylene blue test has been reported to be 100% sensitive and to have no side-effects [30]. Concerning the leakage rate, both CSA and LSA groups have similar outcome. There is no standard technique for creating the gastrojejunostomy in LRYGB. During the learning curve, the use of linear stapler may permit a lower complication rate. As a conclusion, the linear stapling technique may be faster and easier to learn. So, centres that are starting LRYG practice have to take in consideration the previous sentence. The results should be interpreted with caution because different surgeons are performing different techniques.

CONCLUSION

Both circular and linear stapled gastrogejunostomy in LRYGB is safe and easy to perform. Operative time was significantly shorter in the LSA group. Complications, length of stay, weight loss and costs were similar between the groups. CSA and LSA lead to similar early weight loss in LRYGB. In CSA group, a higher incidence ofgastrojejunal strictures and wound infections were seen but there was no any statistical difference. Weight regain following LRYGBP is commonly seen in both groups. Although LSA is in favour of CSA concerning wound infection, strictures and operative time, neither linear nor circular stapled anastomosis has turned out to be superior to one another. Thus, the technique is the surgeon's choice.

                               
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