Published February 2014

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Stacy A. Brethauer, M.D., Shanu Kothari, M.D., Ranjan Sudan, M.D., Brandon Williams, M.D., Wayne J. English, M.D., Matthew Brengman, M.D., Marina Kurian, M.D., Matthew Hutter, M.D., Lloyd Stegemann, M.D., Kara Kallies, B.A., Ninh T. Nguyen, M.D., Jaime Ponce, M.D., John M. Morton, M.D.

Morbid obesity is a chronic disease that requires lifetime treatment. While bariatric surgery is highly effective and durable therapy, as with many other chronic diseases requiring medical or surgical therapy, there will be patients who respond well to an initial therapy and others with only a partial response. There will also be a subset of patients who are nonresponders or have recurrent or persistent disease or complications of therapy; these patients may require escalation of therapy, a new treatment modality, or correction of complications [1].

The paradigm of revisional, adjuvant or escalation of therapy is well established in many medical and surgical specialties. For example, total joint arthroplasty for the treatment of chronic degenerative joint disease has an established early success rate. Patients receiving a successful joint replacement, though, will have varying degrees of functional recovery based on their underlying disease, technical aspects of the procedure, and their functional status before surgery. Over time, there is also a well-established revision rate [2], [3], [4] with joint replacement and, when this initial therapy fails, a revision, replacement, or conversion procedure is offered.

There are many other examples of surgical procedures with known long-term need for revision such as coronary artery bypass grafting, heart valve surgery, abdominal wall hernia repairs, and oncologic operations. In all of these cases, the necessity of reoperative procedures or the use of adjunctive therapy is clear and covered by payors. Review of several major nationwide health plans and plans for state employees in the United States found no limitation with regard to revisional surgery for orthopedics, cardiac surgery, or any other specialty except bariatric surgery [5]. The paradigm of chronic treatment for other diseases is applicable to the chronic disease of morbid obesity and its complications. Therefore, revisional or additional therapy is justified if a primary bariatric procedure does not sufficiently treat the disease of morbid obesity.

Many patients with morbid obesity are not provided insurance coverage for the treatment of this disease or are offered only 1 lifetime procedure to treat it or face near insurmountable barriers to access care. Patient selection for the initial procedure is often determined by the patient’s and primary care physician’s perspective of risk and benefits for their individual medical situation, insurance coverage, and their operative risk in consultation with their surgeon and bariatric program. Patients and surgeons in consultation often choose the operation that best fits their risk and benefit preferences. The opportunity to convert or revise a primary operation that does not achieve adequate weight loss or co-morbidity improvement is therefore necessary to provide effective therapy for these patients. As with other surgical specialties, reoperative bariatric surgery is more challenging than primary procedures and is associated with a higher rate of 30-day adverse events [6]. However, when reoperative surgery is performed by experienced surgeons who perform a variety of revisional procedures, risk and complication rates are acceptable [7], [8], [9], [10].

The purpose of this systematic review is to provide a summary of the current evidence regarding reoperative bariatric surgery. Specific nomenclature has been developed to provide descriptive categories of revisional procedures.


Evidence Search Strategy

MEDLINE 1996–present was queried for the following terms: “bariatrics/ or *bariatric surgery” OR “gastric bypass/ or gastroplasty/” OR “band/ banding” OR “anastomosis, roux-en-y/ or biliopancreatic diversion/ or gastrectomy/” AND “revis$.mp” OR “conver$.mp.” OR “revers$.mp.” OR “fail$.mp.” OR “Reoperation/ reop$.mp.” OR “redo / redo” OR “ or Weight Gain/”. The search was limited to articles in the English language with human patients.

A task force comprised of private practice and academic bariatric surgeons with expertise in reoperative bariatric surgery and critical evidence review was convened to review this topic. The ASMBS Insurance, Research, Clinical Issues, Quality Improvement, and Access to Care committees were represented on the task force. A medical researcher not affiliated with the ASMBS was contracted to perform the literature search and assist with evidence review. Members of the task force reviewed all citations and abstracts that met search criteria. The evidence was graded and sorted by procedure type and type of reoperation according to the nomenclature below. Secondary searches for specific procedures and topics were conducted by the task force based on key articles and bibliographies obtained in the primary search. A flow diagram of the citation selections process is shown in Fig. 1.



Conversion. Procedures that change from an index procedure to a different type of procedure.

Corrective. Procedures addressing complications or incomplete treatment effect of a previous bariatric operation.

Reversal. Procedures that restore original anatomy.

I. Treatment of insufficient weight loss or weight regain after bariatric surgery

While the majority of bariatric patients do achieve successful outcomes after their primary operation, the patients who present with insufficient weight loss, continued co-morbid disease, or weight regain after bariatric surgery represent a challenging population. This group of bariatric patients may benefit from additional surgical therapy to treat their obesity and should be thoroughly evaluated by a multidisciplinary program to determine the potential causes for their poor response. This evaluation may include nutritional and behavioral health assessment and anatomic evaluation based on the original procedure performed. The decision to proceed with additional medical or surgical therapy should be based on this multidisciplinary assessment and the patient’s specific risk/benefit profile for a reoperative procedure [11].

Roux-en-Y gastric bypass

Indications for corrective procedures after gastric bypass are inadequate weight loss, weight regain, or recurrence of weight-related co-morbid conditions. Since these options involve modifying a portion of the bypass anatomy or adding a component to the existing bypass anatomy, they are classified as corrective procedures rather than conversion based on the above nomenclature. The degree of weight regain that warrants a corrective procedure varies widely depending on the patient’s original weight and co-morbidities. Mandatory waiting periods for insurance approval (6 mo of weight management or nutrition visits or documentation of prolonged disease burden, for example) are not indicated and are not supported by the evidence. Preoperative weight loss in specific patients may facilitate the laparoscopic approach or decrease technical difficulties of the operation and participation and duration of preoperative weight loss should be at the discretion of the surgeon and program managing the patient [12].

One type of corrective procedure is intended to increase or restore gastric restriction that contributed to the satiety sensation that assisted patients with their initial weight loss. Endoscopic therapy to reduce the pouch and gastrojejunal (GJ) stomal size has been shown to arrest weight gain [13] and achieve short-term weight loss with minimal risk [14], [15], [16], but most of the published studies are small noncontrolled series and many of the devices reported in the literature are no longer commercially available. Surgical revision of the pouch and GJ may be indicated when there is significant pouch or stoma dilation that allows for a significant reduction in size with surgical therapy or when there is a gastrogastric fistula with inadequate weight loss or a persistent marginal ulcer [17], [18]. In some cases, additional therapy or anatomic change is reported to add to the existing Roux-en-Y gastric bypass (RYGB) anatomy that is intact. Reported options include placement of an adjustable or nonadjustable band around a gastric pouch to achieve additional gastric restriction [7], [19], [20], lengthening the biliopancreatic or Roux limb to increase the malabsorptive or bypass component of the operation, or conversion to duodenal switch (DS) [21]. All of these series report improved weight loss after salvage procedures, but the current evidence supporting these strategies is limited [22]. Complication rates of published studies evaluating procedures for weight gain after RYGB are shown in Table 1.

Laparoscopic adjustable gastric banding

Laparoscopic adjustable gastric banding (LAGB) is unique in that the device is placed without major anatomic alteration. The lack of anatomic alteration is thought to account for the significant lack of hormonal effect associated with LAGB. The average weight loss with LAGB is well documented to be lower than that of the other procedures mentioned. There is currently evidence that the LAGB can be converted to both RYGB, laparoscopic sleeve gastrectomy (SG), and DS to achieve additional weight loss [8], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [34].

Conversion procedures are intended for patients who experienced satisfactory weight loss and corresponding resolution of co-morbidity after LAGB and then experience subsequent weight gain and/or co-morbidity recurrence without a significant anatomic abnormality identified in the corrective surgery section below. Alternatively, some patients initially have insufficient weight loss to resolve their weight-related co-morbidity and do not achieve an acceptable degree of efficacy after band placement.

Other indications for conversion, as discussed below, include complications (slippage, dilation, migration, erosion, port/tube problems or band intolerance). There is some evidence to suggest that fewer complications occur when conversion to another procedure is performed in 2 stages (band removed with interval procedure 2–6 mo later to allow gastric tissue healing) [24,35–38]. Weight loss and co-morbidity outcomes of LAGB patients converted to RYGB, SG, biliopancreatic diversion (BPD), or DS have been reported and are similar to the outcomes for primary RYGB, SG, and BPD/DS [8], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [37], [38], [39]. Specific evidence to support the safety and efficacy of conversion procedures after LAGB is discussed below, and morbidity and mortality rates of conversion procedures are shown in Table 2.

Conversion to RYGB

Reported incidence of conversion from LAGB to RYGB is 2–28.8% [25], [26], [27], [40]. Medium-term (up to 4 yr) weight loss outcomes after conversion of LAGB to RYGB are comparable to primary RYGB outcomes [25], [26], [28], [29], [41], [42], and complication rates are acceptable and most series report early adverse event rates similar to or slightly higher than primary RYGB complication rates [25], [43], [44], [45], [46]. A recent systematic review of 15 studies (588 patients) evaluating conversion of LAGB to RYGB reported an overall complication rate (major and minor) of 8.5% with anastomotic leak and bleeding rates of .9% and 1.8%, respectively. Excess weight loss was between 23% and 74% with follow-up periods ranging from 7–44 months. Decreases in body mass index (BMI) after conversion ranged from 6–12 points with the majority of studies reporting around a 10-point decrease [46].

Conversion to SG

Conversion of LAGB to SG is most commonly performed for inadequate weight loss [7], [8], [30], [31], [32], [47], [48], [49], [50], [51]. Acceptable morbidity rates and short-term (up to 2 yr) weight loss improvement after conversion to SG has been demonstrated in published studies [46], but some series report higher leak rates than primary SG. This is postulated to be a result of the scar tissue at the angle of His that occurs after banding. A recent systematic review of 8 studies (286 patients) evaluating conversion of LAGB to SG reported an overall complication rate (major and minor) of 12.2% with staple line leak rate of 5.6%. Three leaks required reoperation. For studies that reported follow-up periods after revision (6–36 mo), the excess weight loss (EWL) ranged from 31–60% [46].

Removal of a LAGB with conversion to SG can be performed in a single-stage procedure or in 2 stages with band removal and interval conversion to SG. There is some evidence that the staged approach results in fewer leaks at the time of SG but the data are limited [52].

Conversion to BPD/DS

There is some evidence reporting outcomes after LAGB is converted to a malabsorptive procedure. These reports are limited to small case series with short-term follow-up [42], [53]. Conversion to BPD or BPD/DS results in weight loss similar to a primary malabsorptive procedure with published complication rates that are higher than a primary BPD/DS [39].


For patients who need additional therapy for weight loss or develop weight regain after SG, conversion to RYGB or BPD/DS is reported [7], [54], [55], [56]. For high-risk or high BMI patients, utilizing the SG as the first stage of a planned staged approach is an established strategy [57], [58], [59], [60], [61]. In this patient group, the sleeve provides initial weight loss and co-morbidity reduction with improvement in functional status before the second-stage operation (RYGB or BPD/DS) that provides continued weight loss and co-morbidity reduction [62], [63]. Occasionally, very high BMI patients are able to achieve satisfactory weight loss with the first stage only [64], but the option to proceed with the second-stage bypass procedure is available based on the patient’s weight, co-morbidities, and risk [57].

Vertical banded gastroplasty

ertical banded gastroplasty (VBG) was described by Mason [65] in 1982 as a simplified bariatric operation to provide lasting results due to reduced stomach capacity and delayed emptying from a fixed outlet at the distal end of the pouch. The original procedure consisted of creating a 50-mL pouch around a 32-French Ewald tube with a nondivided vertical staple line. The outlet of the vertical pouch was then reinforced with a permanent piece of banding material (Marlex mesh, polypropylene, or silastic ring). This procedure gained popularity due to initial weight loss and fewer nutritional side effects than RYGB [65].

Early reported weight loss after VBG was acceptable [66]; however, VBG patients often displayed maladaptive eating behaviors due to solid food intolerance and were unable to either achieve or sustain adequate weight loss in the long term. (5.0–61%) [33], [67], [68], [69], [70], [71], [72]. Reoperations for VBG most often include conversion to another bariatric procedure, most often RYGB, with appropriate postconversion weight loss.

Conversions to RYGB have been reported in up to 25–65% of patients after VBG [67], [73], though others report lower conversion rates ranging from 4.4–8.0% [74], [75]. The perioperative complication and mortality rates among patients who underwent conversion of VBG to RYGB ranged from 8.9–21.0% [69], [75], [76], [77], and 0–2% [69], [75], [76], [77], [78], respectively. EWL at 31 months after conversion to RYGB has been reported to be 47% [74]. Mean preconversion BMIs ranged from 34.0–46.0 kg/m2, and postconversion BMIs ranged from 28.0–35.0 kg/m2 [69], [75], [76], [77], [79], [80]. In comparing patients who underwent corrective revision of VBG to those who had conversion of VBG to RYGB, subsequent further revisional procedures were observed in 32.2–68.0% of patients who underwent revision versus 0% in those converted to RYGB [67], [81].

When converting VBG to SG, a leak rate of 14% has been reported, and the leak rate is 22% for patients undergoing VBG conversion to BPD/DS [8], [82]. Conversions to open BPD [83], [84] or open BPD/DS [21] have had mixed results. Laparoscopic conversions to BPD/DS have been performed only rarely after VBG [85]. The current evidence suggests that conversion of VBG to SG or BPD/DS should be approached with caution due to high complication rates.

Treatment of acute and chronic complications after bariatric surgery


Conversion. Indications for conversion of RYGB to another procedure are primarily related to weight regain or recurrence of co-morbid disease, but rare metabolic derangements of the primary operation (refractory neuroglycopenia, recalcitrant hypocalcemia with associated hypoparathyroidism, and severe malnutrition) may require conversion of RYGB to SG or BPD/DS, or original anatomy [86], [87]. These reports demonstrate technical feasibility and short-term results of these 1- or 2-stage conversion procedures.

Corrective treatment of acute complications

Gastrointestinal leak. The incidence of anastomotic leak is 0–5.6% [88], [89], [90], [91], [92]. Anastomotic leaks most commonly occur at the gastrojejunostomy and often occur within the first 5 days after surgery [88]. Causes of leaks can be multifactorial [93]. Gastrojejunal leaks are most commonly detected with imaging studies such as an upper gastrointestinal contrast study or computed tomographic (CT) scan. Management of leaks includes fluid resuscitation and intensive care unit admission in the septic patient, antibiotics, operative management with control of the leak and drainage of infected fluid collections. There is a role for nonoperative management with percutaneous drainage (if needed), antibiotics, and nutritional support in a clinically stable patient [88], [92]. Endoscopic therapy (stenting) is appropriate to facilitate closure of the leak after appropriate control of sepsis has been obtained [94], [95]. Leaks at the jejunojejunostomy (JJ), gastric remnant, or other bowel typically present later or have a delayed time to recognition [88]. Treatment is surgical management to close or control the leak with wide drainage.

Obstruction/stricture. Early postoperative bowel obstruction (6 mo) are more refractory to endoscopic therapy and may require surgical revision if they are unresponsive to endoscopic therapy [17].

Bleeding. Bleeding requiring transfusion or reoperation occurs in 1–4% of patients after RYGB [89], [108], [109], [110], [111], [112]. Bleeding can be intra-abdominal or arise within the gastrointestinal tract from an anastomosis or staple line. Treatment of intra-abdominal bleeding in an unstable patient is laparoscopic or open re-exploration and control of the bleeding source. In a stable patient, fluid resuscitation and transfusion with blood products and close clinical observation are appropriate [113]. Gastrointestinal bleeding can present as hematemesis or hematochezia [114]. Treatments of gastrointestinal bleeding often require combined endoscopic and surgical approaches [113], [114].

Corrective treatment of chronic complications

Ulcer. Ulcers at the GJ, also referred to as marginal ulcers, occur 1.0–16% of the time after RYGB [115], [116], [117], [118], [119], [120], [121]. Early causes include ischemia or tension at the anastomosis. Other associated factors include smoking, NSAID, and steroid use, Helicobacter pylori infection, large pouch or a gastrogastric fistula [120]. Symptoms include epigastric pain, nausea, and vomiting. Patients who develop these symptoms or gastrointestinal bleeding after RYGB should have an upper endoscopy performed to evaluate for marginal ulcer. Although rare, ulcers can also occur in other segments of the gastrointestinal tract. Initial treatment is with medical therapy including acid suppression, sucralfate, and elimination of modifiable risk factors such as use of NSAIDs, steroids, tobacco, and caffeine products. Ulcers that are causing severe chronic pain, malnutrition, or bleeding may require surgical resection and revision of the GJ or closure of a gastrogastric fistula if present. Perforation of a marginal ulcer requires urgent surgical treatment [121].

Fistula. Fistulas can occur between the gastric pouch and the gastric remnant (gastrogastric fistula) in 1–2.6% of cases [122]. Gastrogastric fistulas may need to be surgically corrected if they are large enough to contribute to weight gain, associated with ulcers, gastroesophageal reflux disease (GERD), or pain [123]. Other gastric or enteric fistulas that do not close with bowel rest and nutritional support will require surgical management [124].

Obstructions. Late small bowel obstructions (SBO) can occur in 1.3–4.5% of patients after RYGB [125], [126], [127], [128], [129], [130]. Obstructions can be due to surgical adhesions (more common after open RYGB or prior open abdominal surgery) or an internal hernia (more common after laparoscopic RYGB) [125], [126], [127]. Other causes include small bowel intussusception, bezoars, port site hernias, and transverse mesocolic hernias (after a retrocolic Roux limb) [127]. Diagnosis is made with plain film radiographs and CT scan or at the time of surgery. In the setting of a complete obstruction, internal hernia on radiographic imaging, closed loop obstruction, or significant dilation of the biliopancreatic limb and gastric remnant, surgical treatment is indicated to correct the cause of the obstruction and possibly resect any nonviable bowel. Gastrostomy tube placement to provide decompression of the gastric remnant may be indicated.

Additionally, intermittent or chronic abdominal pain after RYGB in a patient with nondiagnostic imaging should warrant diagnostic laparoscopy or laparotomy to evaluate for an internal hernia or open mesenteric defects.


Indications to reverse RYGB are extremely rare and include, but are not limited to, severe intractable nausea, vomiting, excessive weight loss, psychological issues, chronic pain, recurrent anastomotic ulceration, and malnutrition related to a chronic complication of the procedure. Rare complications of RYGB that may necessitate reversal are severe neuroglycopenia, and recalcitrant hypocalcemia associated with hypoparathyroidism that is refractory to dietary and medical management; however, conversion to a SG may resolve the problem [131], [132], [133]. Additionally, patients who have extensive bowel resections after an abdominal catastrophe (internal hernia, volvulus of a long segment of small bowel) may require reversal of the bypass to obtain greater overall bowel continuity [134].

Nonadjustable gastric banding

Nonadjustable gastric banding is no longer considered a standard bariatric procedure. Patients may present, however, with a remote history of band placement and require reoperation. Indications for band removal or conversion to another procedure include but are not limited to intractable nausea, vomiting, food intolerance, erosion, GERD, weight gain, or co-morbidity recurrence. The placement of a nonadjustable ring around the gastric pouch at the time of RYGB can also result in these symptoms and complications. The type of reoperative procedure performed (band removal, proximal gastrectomy with RYGB) is generally left to the discretion of the surgeon based on the type of band, presence of complications, and patient risk.


Corrective treatment of acute complications

Obstruction. The incidence of early postoperative obstruction after LAGB placement is .5–11.0% [135], [136], [137]. Causes of an early postoperative obstruction include an over tight band, a large gastroesophageal fat pad within the band, postoperative edema, perigastric hematoma, acute gastric prolapse, or food impaction at the level of the band. Treatment may include removal of fluid from the band, a period of observation, removal of the band, replacement with a larger band, or endoscopic removal of impacted food. Acute gastric prolapse may present with severe abdominal pain and obstruction. If a prolapse is demonstrated on imaging and the pain is not relieved after removal of fluid from the band system, urgent surgical removal of the band is indicated to prevent ischemia or necrosis of the prolapsed stomach.

Perforation. The incidence of gastric or esophageal perforation at the time of band placement is<1% [138], [139], [140], [141], [142]. Causes of perforation include iatrogenic injury during band placement or a tear in the gastrogastric plication at the site of a suture (related to vomiting). Treatment is surgical and includes laparoscopic or open removal of the band, repair of the perforation if possible, drainage, and antibiotics.

Corrective treatment of chronic complications

Prolapse/pouch dilation. The incidence of prolapse or pouch dilation is .4–8.0% [140], [143], [144], [145], [146]. When a true band slippage/prolapse occurs, the treatment is usually surgical, with many authors suggesting band reposition or band removal with conversion to an alternate procedure. For the patient with successful weight loss and co-morbidity reduction after banding, salvaging the slipped band with replacement or repositioning has been reported to maintain the weight loss effects [20], [53]. However, when the patient has not successfully achieved or maintained weight loss, removal of the LAGB and conversion to an alternate procedure such as SG or RYGB may be indicated [35], [145], [147], [148], [149], [150]. Pouch dilation can be treated initially with band deflation and conservative management. Some of these patients may not lose additional weight or may experience weight gain and will require band removal and conversion to another procedure.

Band intolerance. Band intolerance occurs in approximately .6–6.2% of patients [53], [143], [151]. It is heralded by intrusive obstructive symptoms such as vomiting, esophageal spasm, and GERD in a patient that is not overly restricted (based on volume or imaging). If associated with poor weight loss or co-morbidity reduction, band removal and conversion is indicated. Some patients may not experience severe obstructive symptoms but may develop chronic esophageal dysmotility, esophageal dilation or mega-esophagus due to an over tight band or a band that is too small. These findings warrant removal of the band or conversion to another procedure [53], [143], [147].

Erosion. Incidence of band erosion is 0–6.8% [35], [36], [137], [145], [147], [152], [153]. When this occurs, the treatment is band removal. The methods of removal include endoscopic, endoscopic/laparoscopic, or laparoscopic. After removal, patients will require conversion to another bariatric procedure to treat their obesity and co-morbid disease. It is optimal to wait at least 3 months before conversion to another procedure to allow the perigastric inflammation to resolve. Placing another band after an erosion is generally not recommended [36].

Port and tubing problems. The incidence of port or tubing complications is 4.3–24% [154], [155], [156]. The most common problems in this regard are tubing leak and port dislocation. These are usually treated by replacing the tubing/port that is damaged or refixation of the dislocated port [154], [155].

Gastroesophageal reflux. Post-LAGB, GERD may be exacerbated, or new-onset GERD can occur, with a long-term prevalence of 33.3% cited at 7 years postoperatively [157]. Intractable reflux is usually managed with band deflation and conservative management. If there is pouch dilation associated with hiatal hernia and intractable symptoms, or the symptoms are not controlled with band adjustments, the patient may require reoperation for band reposition/hiatal hernia repair versus conversion to RYGB [23], [24], [40], [158]. Chronic GERD requiring band deflation may necessitate conversion to RYGB to treat the GERD and associated weight gain.


Removal of the band is an acceptable option for the treatment of complications, band intolerance, or ineffective weight loss. While rare, there is occasion when the best approach is to restore the preband surgical anatomy. Common indications for reversal of adjustable gastric band include intractable nausea and vomiting, intractable dysphagia, intractable GERD, adjustable gastric band erosion, chronic or acute adjustable gastric band infection, esophageal dilation, or insufficient weight loss without desire for alternate procedure [148], [152].


Corrective Treatment of acute complications

Leak. Staple line leaks or gastric perforation occur in .5–5.8% of SG cases [159], [160], [161]. Patients with an early postoperative leak present with abdominal pain, fever, and sepsis. Treatment includes control of sepsis with percutaneous or operatively placed drains, closure of the perforation if possible, antibiotics, and nutritional support. Endoscopic stent placement to cover the site of perforation and facilitate closure is appropriate once measures are taken to control any intra-abdominal abscesses or collections [160], [161], [162].

Obstruction/stricture. Early obstruction most commonly occurs at the angularis incisura. Causes include edema, angulation at the incisura, or creation of a lumen that is too narrow. Treatment includes supportive therapy, endoscopic dilation or stenting, and, if obstruction persists, conversion to RYGB.

Corrective treatment of chronic complications

Gastroesophageal reflux. There is a 20–30% incidence of GERD in the long term after SG [54], [163]. Factors associated with developing GERD after SG include hiatal hernia with transhiatal migration of the stomach, retained or dilated gastric fundus, a stricture or angulation of the stomach at the incisura, or de novo reflux due to an incompetent lower esophageal sphincter in the setting of normal SG anatomy. Treatment is initially medical with acid suppression but if symptoms are refractory to medical therapy or if there is an associated anatomic etiology for the GERD, surgical revision may be required. This problem can be corrected with conversion to RYGB, though resection of the dilated fundus with repair of a hiatal hernia (if present) has been reported [54] and may be appropriate for patients that are not good candidates for RYGB.

Late or recurrent leak. Late leaks can occur months after SG and early leaks that appear to heal can recur weeks or months later. These may present as a recurrent abscess or a fistula (gastrocutaneous, gastropleural, gastrosplenic). Management of these late or chronic fistulas requires drainage of any abdominal collections, endoscopic therapy (stenting), and occasionally surgical treatment. Surgical options include resection of the fistula and the involved stomach, conversion to Roux-en-Y gastrojejunostomy, esophagojejunostomy, or fistulojejunostomy depending on the location and character of the fistula and condition of the stomach.

Stricture. Incidence of late stricture is 1.3–25% after SG [164]. This obstruction presents with severe dysphagia, solid food intolerance, or severe GERD. Treatment options include endoscopic dilation and stenting and resection of the stricture with conversion to a RYGB to alleviate the symptoms [160], [161], [164], [165], [166].

VBG (or other nonbanded gastroplasty)

Corrective treatment of chronic complications

Patients require corrective surgery after VBG due to dysphagia, band erosion [67], staple line disruption (6.3–83.3%), GERD [68], [76], [167], [168], [169], [170], and incisional hernias (5.6–16.0%) [68], [171]. In studies with long-term (>5 yr postoperative) follow-up, reoperation rates have been observed between 10.0–56.0% [66], [81], [172]. Corrective surgical options to treat complications include revising the VBG (refixation/band replacement/restapling); however, many VBG operations are converted to RYGB as revising the VBG does not eliminate the potential mechanical complications of the operation and produces less weight loss than a conversion procedure. It should be noted that many VBG patients present with long-term mechanical complications (severe GERD) and weight gain requiring additional therapy.


For patients with severe GERD or food intolerance who do not want a revision to RYGB or are not appropriate candidates for conversion to another procedure, reversal of VGB may be appropriate [173], [174]. Performance of a gastrogastrostomy or removal or division of the band can be performed to provide symptom relief. Some patients also require endoscopic interventions for band or mesh removal if this prosthetic material has eroded into the gastric lumen and is causing obstructive symptoms.

Biliopancreatic diversion with or without duodenal switch

Corrective Treatment of chronic complications

Patients require corrective surgery after VBG due to dysphagia, band erosion [67], staple line disruption (6.3–83.3%), GERD [68], [76], [167], [168], [169], [170], and incisional hernias (5.6–16.0%) [68], [171]. In studies with long-term (>5 yr postoperative) follow-up, reoperation rates have been observed between 10.0–56.0% [66], [81], [172]. Corrective surgical options to treat complications include revising the VBG (refixation/band replacement/restapling); however, many VBG operations are converted to RYGB as revising the VBG does not eliminate the potential mechanical complications of the operation and produces less weight loss than a conversion procedure. It should be noted that many VBG patients present with long-term mechanical complications (severe GERD) and weight gain requiring additional therapy.


For patients with severe GERD or food intolerance who do not want a revision to RYGB or are not appropriate candidates for conversion to another procedure, reversal of VGB may be appropriate [173], [174]. Performance of a gastrogastrostomy or removal or division of the band can be performed to provide symptom relief. Some patients also require endoscopic interventions for band or mesh removal if this prosthetic material has eroded into the gastric lumen and is causing obstructive symptoms.

Biliopancreatic diversion with or without duodenal switch

Corrective treatment of acute complications

Approximately 2% of patients currently undergo BPD/DS as a primary operation in the United States. Early postoperative complication rates after BPD/DS are 2.9–16.3% [175], [176]. These include anastomotic leaks, bleeding, strictures, and obstruction. The management of these early complications when they occur can be surgical or nonsurgical as described in the management of acute complications after RYGB. The specific management depends on the timing and severity of the complication and the clinical condition of the patient.

Corrective treatment of chronic complications

Protein-calorie malnutrition. The incidence of protein calorie malnutrition after BPD or BPD/DS ranges from 1–6% [177], [178], [179] depending on the length of the common channel. Excessive reduction of the stomach size can also result in reduced oral intake and contribute to protein-calorie deficiency in the early months after a BPD/DS. Malnutrition after BPD/DS requires a careful nutritional evaluation and initial management should include the addition of oral pancreatic enzymes and nutritional support (enteral or parenteral if necessary) to improve protein stores before any revision. If these measures are not sufficient to improve weight and protein stores, surgery may be indicated to lengthen the common channel and increase the common channel absorptive capacity. This surgical revision is rarely necessary and is generally most helpful in patients with a common absorptive channel

GERD. As with the SG alone, the sleeve portion of the DS operation can result in chronic GERD [54], [163]. Conversion to RYGB to control these symptoms is not a favored option anatomically due to the extensive reconstruction involved and associated risks. If behavioral and medical control of GERD fails, and the gastric capacity is large or if there is dilated or retained fundus contributing to refractory GERD symptoms, a resleeve or fundectomy operation is has been reported to control the symptoms [54].

Jejunoileal bypass

Jejunoileal bypass is no longer performed due to the well-documented long-term complications. Reversal or conversion of jejunoileal bypass to SG or RYGB should be considered to prevent cirrhosis, oxalate nephropathy and renal failure, and chronic malnutrition [180]. If reversal or conversion is not indicated, regular follow-up and evaluation for metabolic complications must be continued.

Conclusions and Future Directions

The current evidence regarding reoperative bariatric surgery includes a diverse group of patient populations and procedures. The majority of the studies are single institution case series reporting short- and medium-term outcomes after reoperative procedures. The reported outcomes after reoperative bariatric surgery are generally favorable and demonstrate that additional weight loss and co-morbidity reduction is achieved with additional therapy. The risks of reoperative bariatric surgery are higher than with primary bariatric surgery and the evidence highlights the need for careful patient selection and surgeon expertise. The specific type of reoperative procedure performed should be based on the primary operation, the patient’s anatomy, the patient’s weight and co-morbidities, and the experience of the surgeon.

Based on the Task Force’s review of this complex issue and careful evaluation of the quality and content of the available evidence, additional guiding principles and future directions to clarify this topic are offered:

    1. Morbid obesity is a chronic disease and acceptable long-term management after a primary bariatric procedure should include the surgical options of conversion, correction, or other adjuvant therapy to achieve an acceptable treatment effect in cases of weight recidivism, inadequate weight loss, inadequate co-morbidity reduction, or complications from the primary procedure.
    2. “One bariatric procedure per lifetime” and other coverage policies that limit or prohibit reoperative bariatric surgery are not consistent with coverage policies provided for any other chronic disease process, and should be abandoned where they exist.
    3. Short- and long-term outcomes after bariatric surgery should be reported as part of an accreditation or quality improvement program. As the number of reoperative bariatric procedures increases, ongoing data collection will be required to provide future recommendations regarding the efficacy and durability of specific reoperative procedures.
    4. Outcomes of reoperative bariatric surgery are inconsistently reported in the literature. Arbitrary definitions of success and failure after bariatric surgery based on EWL do not accurately reflect control of the disease and vary widely based on the population being studied. If the disease of morbid obesity or obesity-related disease is still present after primary therapy, additional therapy is indicated.
    5. Reoperative bariatric procedures should be performed by experienced bariatric surgeons in bariatric centers that have the resources to manage these challenging patients and can provide early rescue to patients who potentially develop postoperative complications.


The authors have no commercial associations that might be a conflict of interest in relation to this article.


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