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Bologna guidelines for diagnosis and management of adhesive small bowel obstruction (ASBO): 2013 update of the evidence-based guidelines from the world society of emergency surgery ASBO working group

Salomone Di Saverio1, Federico Coccolini5, Marica Galati1, Nazareno Smerieri1, Walter L Biffl4, Luca Ansaloni5, Gregorio Tugnoli1, George C Velmahos7, Massimo Sartelli8, Cino Bendinelli13, Gustavo Pereira Fraga17, Michael D Kelly3, Frederick A Moore11, Vincenzo Mandalà6, Stefano Mandalà6, Michele Masetti1, Elio Jovine1, Antonio D Pinna2, Andrew B Peitzman16, Ari Leppaniemi15, Paul H Sugarbaker9, Harry Van Goor10, Ernest E Moore4, Johannes Jeekel12 and Fausto Catena142*

Author Affiliations

1 Emergency and Trauma Surgery Unit, Departments of Emergency and Surgery, Maggiore Hospital Trauma Center, Bologna, Italy

2 Emergency Surgery Unit, Department of General and Multivisceral Transplant Surgery, S Orsola Malpighi University Hospital, Bologna, Italy

3 Upper GI Unit, Department of Surgery, Frenchay Hospital, North Bristol, NHS Trust, Bristol, UK

4 Department of Surgery, Denver Health, University of Colorado Health Sciences Denver, Denver Health Medical Center, 777 Bannock Street, Denver CO 80204, USA

5 General Surgery I, Ospedali Riuniti di Bergamo, Bergamo, Italy

6 Department of General and Emergency Surgery, Associated Hospitals “Villa Sofia - Cervello”, Palermo, Italy

7 Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA

8 Department of Surgery, Macerata Hospital, Via Santa Lucia 2, 62100 Macerata, Italy

9 Washington Cancer Institute, Washington Hospital Center, Washington, 20010 DC, USA

10 Department of Surgery, Radboud University Nijmegen Medical Centre, P.O. Box 9101 6500 HB, Nijmegen, The Netherlands

11 Department of Surgery, University of Florida, Gainesville, FL 32610-0254, USA

12 Department of Surgery, Erasmus University Medical Center, PO Box 2040 3000 CA, Rotterdam, The Netherlands

13 Department of Surgery, John Hunter Hospital and University of Newcastle, Locke Bag 1 Hunter Region Maile Centre, Newcastle, NSW 2310, Australia

14 Department of Emergency and Trauma Surgery, Maggiore Hospital of Parma, Parma, Italy

15 Emergency Surgery, Department of Abdominal Surgery, Meilahti Hospital, University of Helsinki, Haartmaninkatu 4, 340, Helsinki FIN-00029 HUS, Finland

16 Division of General Surgery, University of Pittsburgh Physicians, Pittsburgh 15213 PA, USA

17 Division of Trauma Surgery, University of Campinas, Campinas, SP, Brazil

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World Journal of Emergency Surgery 2013, 8:42  doi:10.1186/1749-7922-8-42

The electronic version of this article is the complete one and can be found online at: http://www.wjes.org/content/8/1/42


Received:20 September 2013
Accepted:23 September 2013
Published:10 October 2013

© 2013 Di Saverio et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Abstract

Background

In 2013 Guidelines on diagnosis and management of ASBO have been revised and updated by the WSES Working Group on ASBO to develop current evidence-based algorithms and focus indications and safety of conservative treatment, timing of surgery and indications for laparoscopy.

Recommendations

In absence of signs of strangulation and history of persistent vomiting or combined CT-scan signs (free fluid, mesenteric edema, small-bowel feces sign, devascularization) patients with partial ASBO can be managed safely with NOM and tube decompression should be attempted. These patients are good candidates for Water-Soluble-Contrast-Medium (WSCM) with both diagnostic and therapeutic purposes. The radiologic appearance of WSCM in the colon within 24 hours from administration predicts resolution. WSCM maybe administered either orally or via NGT both immediately at admission or after failed conservative treatment for 48 hours. The use of WSCM is safe and reduces need for surgery, time to resolution and hospital stay.

NOM, in absence of signs of strangulation or peritonitis, can be prolonged up to 72 hours. After 72 hours of NOM without resolution, surgery is recommended.

Patients treated non-operatively have shorter hospital stay, but higher recurrence rate and shorter time to re-admission, although the risk of new surgically treated episodes of ASBO is unchanged. Risk factors for recurrences are age <40 years and matted adhesions. WSCM does not decrease recurrence rates or recurrences needing surgery.

Open surgery is often used for strangulating ASBO as well as after failed conservative management. In selected patients and with appropriate skills, laparoscopic approach is advisable using open access technique. Access in left upper quadrant or left flank is the safest and only completely obstructing adhesions should be identified and lysed with cold scissors. Laparoscopic adhesiolysis should be attempted preferably if first episode of SBO and/or anticipated single band. A low threshold for open conversion should be maintained.

Peritoneal adhesions should be prevented. Hyaluronic acid-carboxycellulose membrane and icodextrin decrease incidence of adhesions. Icodextrin may reduce the risk of re-obstruction. HA cannot reduce need of surgery.

Adhesions quantification and scoring maybe useful for achieving standardized assessment of adhesions severity and for further research in diagnosis and treatment of ASBO.

Background of WSES guidelines

Adhesive small bowel obstruction requires appropriate management with a proper diagnostic and therapeutic pathway. Indication and length of Non Operative treatment and appropriate timing for surgery may represent an insidious issue.

Delay in surgical treatment may cause a substantial increase of morbidity and mortality. However repeated laparotomy and adhesiolysis may worsen the process of adhesion formation and their severity. Furthermore the introduction and widespread of laparoscopy has raised the question of selection of appropriate patients with ASBO good candidate for laparoscopic approach. On the other hand, several adjuncts for improving the success rate of NOM and clarifying indications and timing for surgery are currently available, such as hyperosmolar water soluble contrast medium.

No consensus has been reached in diagnosing and managing the patients with ASBO and specific and updated guidelines are lacking.

We carried out an extensive review of the English-language literature and found that there was little high-level evidence in this field, and no systematically described practical manual for the field. Most importantly, there are no standardized diagnostic criteria and therapeutic management guidelines for ASBO, therefore, we would like to establish standards for these items. The Bologna Guidelines include evidence-based medicine and reflect the international consensus obtained through earnest discussions among professionals in the field on 1–3 July, 2010, at the Belmeloro Convention Center, Bologna, Italy.

We aimed to validate and refine the first version of the guidelines, hypothesizing that a model, incorporated in a treatment algorithm, would be predictive, would prevent delayed management of strangulation and would be successfully improved.

Therefore in 2013 the guidelines have been revised and updated by the WSES Working Group on ASBO with the development of diagnosis and treatment evidence-based algorithms (Figure 1, Figure 2).

thumbnailFigure 1. Evidence-based Algorithm for Diagnosis and Assessment of ASBO.

thumbnailFigure 2. Evidence-based Algorithm for Management and Treatment of ASBO.

Furthermore a customary management can help to standardize care throughout a district, a region, or a state satisfying the corporate governance requirements of “clinical efficacy” and “economic efficiency” with the results of improved outcomes and decreased costs.

Improvement of performance is a mainstay of any practice management guideline.

Notes on the use of the guidelines

The Guidelines are evidence-based, with the grade of recommendation also based on the evidence. The Guidelines present the diagnostic and therapeutic methods for optimal management and prevention of ASBO.

The practice Guidelines promulgated in this work do not represent a standard of practice. They are suggested plans of care, based on best available evidence and the consensus of experts, but they do not exclude other approaches as being within the standard of practice. For example, they should not be used to compel adherence to a given method of medical management, which method should be finally determined after taking account of the conditions at the relevant medical institution (staff levels, experience, equipment, etc.) and the characteristics of the individual patient. However, responsibility for the results of treatment rests with those who are directly engaged therein, and not with the consensus group.

Definition

Abdominal adhesions, which can begin forming within a few hours after an operation, represent the most common cause of intestinal obstruction being responsible for 60% to 70% of SBO [1,2]. Adhesional postoperative small bowel obstruction is characterized by the presence of abdominal pain, vomiting, distention, and obstipation, in conjunction of confirmatory imaging.

Risk factors

Patients with ASBO treated nonsurgically have shorter hospital stay, however they have an higher recurrence rate, shorter time to re-admission, although the risk of new surgically treated episodes of ASBO is the same (Level of Evidence 2b).

SBO can be classified according to completeness: Partial vs. Complete (or high grade vs. low grade), according to etiology: Adhesional vs. Non-adhesional, according to timing: Early vs. Late (>30 days after surgery).

Even if Zielinski and Bannon proposed to switch the traditional focus of differentiating SBO to one of predicting failure of NOM with the goal of exploring patients with expected failure as soon as possible [3].

The most important risk factor for adhesive SBO is the type of surgery and extent of peritoneal damage.

The technique of the procedure (open VS laparoscopic) play an important role in the development of adhesion related morbidity. In a retrospective review of 446.331 abdominal operation, Galinos et al. noticed that the incidence was 7.1% in open cholecystectomies vs 0.2% in laparoscopic; 15.6 in open total abdominal hysterectomies vs 0.0% in laparoscopic; 23.9% in open adnexal operations vs 0.0% in laparoscopic and there was no significant difference between open and laparoscopic appendectomies (1.4% vs 1.3%) [4].

In a further recent paper Reshef et al. compared the risk of ASBO in 205 patients who underwent laparoscopic colorectal surgery and 205 who underwent similar open operations, both without any previous history of open surgery. After a mean follow-up of 41 months the authors found that although the rate of admission for ASBO was similar (9% vs 13%, p = 0.3 for the laparoscopic and the open group), the need for operative intervention for ASBO was significantly lower after laparoscopic operations (2% vs 8%, p = 0.006). These data suggest that the lower incidence of adhesions expected after laparoscopic surgery likely translates into long-term benefits in terms of reduced SBO [5].

Other well-known risk factors include surgeries of the colon and rectum (i.e. total colectomy with ileal pouch-anal anastomosis), gynecologic surgeries, age younger than 60 years, previous laparotomy within 5 years, peritonitis, multiple laparotomies, emergency surgery, omental resection, and penetrating abdominal trauma, especially gunshot wounds, a high number of prior episodes of ASBO [1-10].

Initial evaluation

After an accurate physical examination and the evaluation of WBC, Lactate, Electrolytes, BUN/Creat; first step of diagnostic work up for ASBO is supine and erect plain abdominal X-ray which can show multiple air-fluid levels, distension of small bowel loops and the absence of gas in the colonic section [11].

All patients being evaluated for small bowel obstruction should have plain films (Level of Evidence 2b GoR C).

Secondary evaluation

CT scan is highly diagnostic in SBO and has a great value in all patients with inconclusive plain films for complete or high grade SBO [12]. However CT-scans should not be routinely performed in the decision-making process except when clinical history, physical examination, and plain film are not conclusive for small bowel obstruction diagnosis [13] (Level of Evidence 2b GoR B).

CT scan often allows to confirm the presence of complete obstruction, to reach the diagnosis of the cause of SBO, it also exclude a non-adhesional pathology and assess the occurrence of strangulation with a sensitivity and specificity higher than 90% and a NPV of nearly 100% [14].

The association of CT scan signs of bowel ischemia should lead a low threshold for surgical intervention (Level of Evidence 2a GoR B).

Ultrasound has a limited value in bowel obstruction or in patients with distended bowel, because the air may obscure the underlying findings. Usual US findings are: distention, peristalsis (differential diagnosis of ileus vs. mechanical SBO), differences in mucosal folds around transition point, free fluid (sign of ischemia) [15].

MRI use should be restricted to those patients having CT or iodine contrast contraindications (Level of Evidence 2c GoR C).

Water-soluble contrast follow-through is valuable in patients undergoing initial non operative conservative management in order to rule out complete ASBO and predict the need for surgery [16] (Level of Evidence 1b GoR A). Water-soluble contrast administration has both diagnostic and therapeutic value [17,18].

This investigation is safer than barium in cases of perforation and peritoneal spread and has possible therapeutic value in the case of adhesive small intestine obstruction [19].

Conservative treatment and timing for surgery

The management of ASBO is controversial because surgery can induce new adhesions, whereas conservative treatment does not remove the cause of the obstruction [20]. Conservative treatment involves nasogastric intubation, intravenous fluid administration, and clinical observation. Strangulation of the bowel requires immediate surgery, but intestinal ischemia can be difficult to determine clinically.

Potentially, acute care surgery (ACS) model may adversely affect patients who present with SBO because they may be handed over from surgeon to surgeon without definitive care. These patients may not require an operation initially but may require one subsequently because of the development of complications or if the SBO does not resolve with conservative treatment.

In an Australian retrospective study Lien et al. observed that, in the ACS period, there was no significant difference in complication rates or length of hospital stay in those who were not handed over and those who were, both in the pre-ACS and ACS period.

The authors suggested that clinical handover may provide an 'audit-point’ for patient management and opportunity for collaborative input. Moreover, participation of doctors with greater clinical experience may minimize errors in information transfer due to increased acumen in recognizing potential complications [21].

A delay in operation for SBO places patients at higher risk for bowel resection. In a retrospective review Leung and coll find that younger patients (P = 0.001), no previous operation (P < 0.001), and absence of adhesive disease (P < 0.001) were more likely to go to operation. Acquiring a CT scan (P = 0.029) or radiograph (P < 0.001) were factors that increased time to the operating room (OR). In the group with time to OR less than 24 hours, 12% of patients had bowel resection versus time to OR greater than 24 hours, 29% of them required bowel resection [22].

Several issues are raised when managing patients with ASBO.

Operative management VS Non operative management

Patients without the signs of strangulation or peritonitis or history of persistent vomiting or combination of CT scan signs (free fluid, mesenteric edema, lack of feces signs, devascularized bowel) and partial ASBO can safely undergo non-operative management (LoE 1a GoR A). In these patients tube decompression should be attempted (Level of Evidence 1b GoR A), either with NGT or LT [23].

In conservatively treated patients with ASBO, the drainage volume through the long tube on day 3 (cut-off value; 500 mL) was the indicator for surgery [24].

Also in patients with repeated episodes and many prior laparotomies for adhesions, prolonged conservative treatment (including parenteral nutritional support) may be prudent and often avoid a complex high-risk procedure [25], but the use of supplementary diagnostic tools might be desirable to find the patients who will need early operative treatment [26].

Patients who had surgery within the six weeks before the episode of small bowel obstruction, patients with signs of strangulation or peritonitis (fever, tachycardia and leucocytosis, metabolic acidosis and continuous pain), patients with irreducible hernia and patients who started to have signs of resolution at the time of admission are NOT candidate for conservative treatment +/- WSCA administration (Level of Evidence 1a GoR A) [27,28].

Complete SBO (no evidence of air within the large bowel) and increased serum creatine phosphokinase predicts NOM failure (Level of Evidence 2b GoR C). Free intraperitoneal fluid, mesenteric edema, lack of the “small bowel feces sign” at CT, and history of vomiting, severe abdominal pain (VAS > 4), abdominal guarding, raised WCC and devascularized bowel at CT predict the need for emergent laparotomy at the time of admission (Level of Evidence 2c GoR C).

The appearance of water-soluble contrast in the colon on abdominal X ray within 24 hours of its administration predicts resolution of ASBO (Level of Evidence 1a GoR A). Among patients with ASBO initially managed with a conservative strategy, predicting risk of operation is difficult.

Tachycardia, fever, focal tenderness, increased white blood cell counts, and elevated lactate levels can indicate intestinal ischemia, but these indicators are not very specific [29]. When intestinal ischemia is unlikely, a conservative approach can be followed for 24–48 h.

Zielinski and Bannon in a recent review suggest to combine data from oral contrast meal with their predictive model which identifies patients with mesenteric edema, lack of the small bowel feces signs and obstipation from 12 hours at high risk. The authors recommend urgent exploration for any patient presenting with signs of strangulation or all three of the new model features on admission and without contrast in the colon within 8 hours of administration [3].

Moreover Schraufnagel et al. in n univariate analyses shown that complications, resection, prolonged length of stay and death are more likely in patients admitted for ASBO and operated on the fourth day or later [30].

Non operative management

There are no advantages with the use of long tube decompression compared with the use of nasogastric tubes (Level of Evidence 1b GoR A) [23,31].

However early tube decompression, either with long or nasogastric tube, may be beneficial (Level of Evidence 2b GoR C) in the initial management of non strangulating ASBO, in adjunct with fluid resuscitation and electrolytes imbalances correction. For challenging cases of ASBO, the long tube should be placed as soon as possible [24] more advisable by endoscopy, rather than by fluoroscopic guide [32].

The use of Gastrografin in ASBO is safe (in terms of morbidity and mortality) and reduces the need for surgery, the time to resolution of obstruction and the hospital stay (Level of Evidence 1a GoR A) [16,19,33-35]. Nevertheless anaphylactoid reaction and lethal aspiration have been described [36].

Gastrografin may be administered on the dosage of 50–150 ml, either orally or via NGT and can be given both at immediately admission or after an attempt of initial traditional conservative treatment of 48 hours (Level of Evidence 1b GoR A).

Regarding the therapeutic value of Gastrografin, some authors affirmed that water-soluble contrast reduces the hospital stay but does not reduce the need for surgery [27,37,38], others has proven that is effective in both reducing the need for surgery and shortening hospital stay, without differences in complications and mortality [28].

As further adjuncts needs to be mentioned that oral therapy with magnesium oxide, L. acidophilus and simethicone may hasten the resolution of conservatively treated partial ASBO and shorten the hospital stay (Level of Evidence 1b GoR A) [39].

To be thorough it has to be mentioned Hyperbaric oxygen (HBO) therapy, that appears to be beneficial in older patients with high anesthesiologic risk (Level of Evidence 2b GoR B). HBO therapy may be an option in the management of patients for whom surgery should be avoided [40].

Indication for delayed operation

Usually NOM, in absence of signs of strangulation or peritonitis, can be prolonged up to 72 hours of adhesive SBO (Level of Evidence 2b GoR C) [41].

After 3 days without resolution, WSCA study or surgery is recommended (Level of Evidence 2b GoR C) [31].

If ileus persists more than 3 days and the drainage volume on day 3 is > 500 ml, surgery for ASBO is recommended (Level of Evidence 2b GoR C) [24].

With closely monitoring and in the absence of signs suggestive of complications, an observation period even longer than 10 days before proceeding to surgical intervention appears to be safe [42].

However at any time, if onset of fever and leukocytosis greater than 15 000/mm3 (predictors of intestinal complications) are observed, then NOM should be discontinued and surgery is recommended.

The patients non responders to the long-tube and conservative treatment within 72 hours have a considerable risk of recurrent ASBO (Level of Evidence 2b GoR C).

Risk factors for recurrences are age <40 years, matted adhesion (Level of Evidence 1b GoR A) and postoperative surgical complications [43].

Gastrografin use does not affect the recurrences rates or recurrences needing surgery when compared to traditionally conservatively treated patients (Level of Evidence 1b GoR A) [19].

Surgical treatment: open VS laparoscopic approach

Open surgery is the preferred method for the surgical treatment of strangulating ASBO and after failed conservative management (LOE 2c GOR C).

In highly selected group of patients the laparoscopic can be attempted using an open access technique (LOE 2c GOR C).

The access in the left upper quadrant should be safe (LOE 4 GOR C).

Laparoscopic lysis of adhesions should be attempted preferably in case of first episode of SBO and/or anticipated single band adhesion (i.e. SBO after appendectomy or hysterectomy) (LOE 3b GOR C).

A low threshold for open conversion should be maintained if extensive adhesions are found (LOE 2c GOR C).

Conversion to laparoscopic-assisted adhesiolysis (mini-laparotomy with an incision less than 4 cm long) or laparotomy should be considered in those patients presenting with dense or pelvic adhesion (LOE 3b GOR C).

The extent of adhesiolysis is a matter still under debate. The approaches to adhesiolysis for bowel obstruction among general surgeons in the United Kingdom were established in 1993 [44]. Half of all surgeons divided all adhesions to prevent recurrence of bowel obstruction, whereas the other half limited adhesiolysis to only the adhesions responsible for the obstruction.

The risk of anterior abdominal wall adhesions increases with the number of previous laparotomies although this relationship is not as evident as the relationship between previous laparotomies and adhesiolysis-induced enterotomy [45,46].

Higher age and higher number of previous laparotomies appeared to be predictors of the occurrence of inadvertent enterotomy [46]. Patients with three or more previous laparotomies had a 10-fold increase in enterotomy compared with patients with one or two previous laparotomies strongly suggesting more dense adhesion reformation after each reoperation.

Historically, laparotomy and open adhesiolysis have been the treatment for patients requiring surgery for small bowel obstruction. Unfortunately, this often leads to further formation of intraabdominal adhesions with approximately 10% to 30% of patients requiring another laparotomy for recurrent bowel obstruction [29].

In animal models laparoscopy has been shown to decrease the incidence, extent, and severity of intraabdominal adhesions when compared with open surgery, thus potentially decreasing the recurrence rate for adhesive small bowel obstruction [47].

Tolutope and Scott administered a questionnaire to all the general surgeons registered in the state of Connecticut, trying to know their opinions about the use of laparoscopic lysis of adhesions (LLA) to manage adhesive small bowel obstruction compared with open lysis of adhesions (OLA) in terms of safety, contraindications, and outcomes.

According to their self-reports, 60% of the respondents used LLA in their practice, with 38% of this group using LLA for less than 15% of their adhesive SBO cases. Compared with surgeons out of training more than 15 years, a greater number of surgeons out of training less than 15 years considered LLA to be safer (P = 0.03) and to have better outcomes (P = 0.04) than OLA. More surgeons in academic/teaching hospitals considered LLA to be safe than did surgeons in nonacademic/nonteaching settings (P = 0.04), and more members of the Society of American Gastrointestinal and Endoscopic Surgeons/ Society of Laparoendoscopic Surgeons, considered LLA to be safe than nonmembers (P = 0.001).

These data suggest that recent training and interest or membership in minimally invasive surgery associations influence surgeons’ choice for laparoscopic lysis of adhesions [48].

Laparoscopy seems to have an advantage above laparotomy in terms of adhesion formation to the abdominal wall and to the operative site [49,50], both because of no further scar on anterior parietal peritoneum and because usually the exploration of the ileum is limited to solve the cause of obstruction, extending the dissection until the ligament of Treitz only when the cause of obstruction is not be detected [51].

Laparoscopic adhesiolysis for small bowel obstruction has a number of potential advantages: (1) less postoperative pain, (2) faster return of intestinal function, (3) shorter hospital stay, (4) reduced recovery time, allowing an earlier return to full activity, (5) decreased wound complications, and (6) decreased postoperative adhesion formation [52,53].

These data have been validated in a meta-analysis in which Ming-Zhe Li et al. found that there was no statistically significant difference between open versus laparoscopic adhesiolysis in the number of intraoperative bowel injuries, nor for wound infections, neither with respect to the overall mortality. Conversely there was a statistically significant difference concerning pulmonary complications and a considerable reduction in prolonged ileus in the laparoscopic group compared with the open group. The authors sustain that laparoscopic approach is safer than the open procedure, but in the hands of experienced laparoscopic surgeons in selected patients [54].

Besides Stephanian et al. observed that minimal trauma, short duration of the operation, good cosmetic results and uncomplicated course of postoperative period witness the efficacy of laparoscopic approach [55].

In a consensus conference on laparoscopic adhesiolysis, an italian panel of experts recommended intraoperative selection of patients after esploratory laparoscopy, because this approach allows as many patients as possible to benefit from this mini-invasive procedure. They agree that the only absolute exclusion criteria for laparoscopic adhesiolysis in SBO are those related to pneumoperitoneum (i.e. hemodynamic instability or cardiopulmonary impairment); all other contraindication are relative and shoud be judjed on a case-to-case basis, depending on the laparoscopic skills of the surgeon. Moreover non resolving partial incomplete SBO(after a negative Gastrografin test) and chronic obstructive symptoms are the ideal application for laparoscopic adhesiolysis with rates of conversion as low as 8.7% [56].

However no randomized controlled trial comparing open to laparoscopic adhesiolysis exists up to date, and both the precise indications and specific outcomes of laparoscopic adhesiolysis for adhesive SBO remain poorly understood. The only RCT on laparoscopic adhesiolysis assessed the incidence of chronic abdominal pain after randomization to laparoscopic adhesiolysis or no treatment during diagnostic laparoscopy and it failed to demonstrate any significant differences in terms of pain or discomfort [57].

Although data from a retrospective clinical controlled trial suggest that laparoscopy seems feasible and better in terms of hospital stay and mortality reduction [58].

In a retrospective analyisis Grafen et al. compared the outcomes of laparoscopic management of ASBO to both exploratory laparotomy and secondary conversion to open surgery. 93 patients were divided into successful laparoscopy (71%), secondary conversion (26%) and primary laparotomy (3%). The first group had more simple adhesions, fewer prior operations, lower ASA score, shortest operative time, as was the duration of both intensive care unit and hospital stay; moreover they were younger and had a shorter duration of SBO prior to their operation. Despite that mortality was 6%, regardless of operative technique. The authors, moreover, found that patients who only had prior appendectomy or cholecystectomy could all be managed laparoscopically without need for secondary conversion; on the other hand a prolonged ileus (mean 4.3 days) with progressive abdominal distension and a higher number or more demanding previous operations address to a primary laparotomy. Finally the reasons for converting to open adhesiolysis were: inadequate laparoscopic control due to intestinal distension, extensive adhesions, iatrogenic perforations and resection of necrotic segments [59].

When deciding between an open or laparoscopic approach, the first consideration is that the surgeon be trained and capable of performing advanced laparoscopy.

With regards to patient selection, individuals with an acute small bowel obstruction and peritonitis, free air or gangrenous bowel requiring an emergent operation are best managed with a laparotomy. Patients without peritonitis who do not resolve with nonoperative management should be considered for laparoscopic adhesiolysis. In these cases, it is important to consider the bowel diameter, degree of abdominal distention, and location of the obstruction (ie, proximal or distal). Suter et al. [60] found that a bowel diameter exceeding 4 cm was associated with an increased rate of conversion: 55% versus 32%. Patients with a distal and complete small bowel obstruction have an increased incidence of intraoperative complications and increased risk of conversion. Patients with persistent abdominal distention after nasogastric intubation are also unlikely to be treated successfully with laparoscopy.

The influence of dense adhesions and the number of previous operations on the success of laparoscopic adhesiolysis is controversial. León et al. state that a documented history of severe or extensive dense adhesions is a contraindication to laparoscopy [61]. In contrast, Suter et al. found no correlation between the number and or type of previous surgeries and the chance of a successful laparoscopic surgery [60]. Other factors such as an elevated white blood cell count or a fever have not been demonstrated to correlate with an increased conversion rate. One group of patients who are good candidates for laparoscopic adhesiolysis are those with a nonresolving, partial small bowel obstruction or a recurrent, chronic small bowel obstruction demonstrated on contrast study [61,62].

In an Irish systematic review of over 2000 cases of ASBO, 1284 (64%) were successfully treated with a laparoscopic approach, 6.7% were lap-assisted, and 0.3% were converted to hernia repair; the overall conversion rate to midline laparotomy was 29%. Dense adhesions, bowel resection, unidentified pathology and iatrogenic injury accounted for the majority of conversions. When the etiology was attributed to a single-band adhesion, the success rate was 73.4%. Morbidity and mortality were respectively 14.8% and 1.5%. The inadvertent enterotomy rate was 6.6%. In this perspective laparoscopy seems to be feasible and effective treatment for ASBO with acceptable morbidity [63].

Navez et al. reported that when the cause of obstruction was a single band, laparoscopic adhesiolysis was successful 100% of the time [64].

When other etiologies are found, such as internal hernia, inguinal hernia, neoplasm, inflammatory bowel disease, intussusception, and gallstone ileus, conversion to a minilaparotomy or a formal laparotomy is often required.

Inadvertent enterotomy during reopening of the abdomen or subsequent adhesion dissection is a feared complication of surgery after previous laparotomy. The incidence can be as high as 20% in open surgery and between 1% and 100% in laparoscopy [65].

The incidence of intraoperative enterotomies during laparoscopic adhesiolysis ranges from 3% to 17.6%, with most authors reporting an incidence of about 10% [66,67].

One of the most dreaded complications of surgery is a missed enterotomy. Although a missed enterotomy can occur after laparotomy, the incidence is higher after laparoscopic surgery.

The long-term results regarding recurrence are limited, with most series reporting a mean follow-up between 12 and 24 months.

Feasibility of diagnostic laparoscopy is ranging from 60% to 100% whilst therapeutic effectiveness of the laparoscopic approach is lower (40-88%). Predictive factors for successful laparoscopic adhesiolysis are: number of previous laparotomies ≤2, non-median previous laparotomy, appendectomy as previous surgical treatment causing adherences, unique band adhesion as pathogenetic mechanism of small bowel obstruction, early laparoscopic management within 24 hours from the onset of symptoms, no signs of peritonitis on physical examination, experience of the surgeon [68,69].

Surgical operating time is greater in patients who underwent laparoscopic surgery compared to patients who underwent a laparotomy [70,71].

Postoperative morbidity is lower in patients who underwent laparoscopic adhesiolysis compared to those who underwent the laparotomic approach. Furthermore a greater rate of morbidity is present in patients who underwent laparotomic conversion; whereas mortality is comparable in the two groups (0-4%). Finally the laparoscopic adhesiolysis can avoid laparotomy, which is itself a cause of new adhesions and bowel obstruction, although some authors noticed a greater incidence of recurrent small bowel obstructions in patients who underwent laparoscopy compared to those in which a laparotomy was performed [72,73].

Operative technique has a capital role for a successful laparoscopic treatment [52]. The initial trocar should be placed away (alternative site technique) from the scars in an attempt to avoid adhesions. Some investigators have recommended the use of computed tomography scan or ultrasonography to help determine a safe site for the initial trocar insertion.

The left upper quadrant or the left flank are usually the safest safe place to gain access to the abdominal cavity. Alternatively a 10 mm port can be inserted in the left flank with two additional 5 mm ports in the left upper and lower quadrant (or 10 mm and 5 mm respectively) [74]. Therefore, by triangulating 3 ports aimed at the right lower quadrant, a good exposure and access to the right iliac fossa can be obtained and a technique running the small bowel in a retrograde fashion, starting from the ileocecal valve (decompressed intestine) proximally towards the transition point between collapsed and dilated loops.

The open (Hasson) approach under direct vision is the more prudent. Once safe access is obtained, the next goal is to provide adequate visualization in order to insert the remaining trocars. This often requires some degree of adhesiolysis along the anterior abdominal wall. Numerous techniques are available, including finger dissection through the initial trocar site and using the camera to bluntly dissect the adhesions. Sometimes, gentle retraction on the adhesions will separate the tissue planes. Most often sharp adhesiolysis is required. The use of cautery and ultrasound dissection should be limited or possibly avoided in order to prevent thermal tissue damage and bowel injury [74].

The risk of enterotomy can be reduced if meticulous care is taken in the use of atraumatic graspers only and if the manipulation of friable, distended bowel is minimized by handling the mesentery of the bowel whenever possible [74]. In fact to handle dilated and edematous bowel during adhesiolysis is dangerous and the risk increases with a long lasting obstruction; this is the reason why early operation is advisable as one multicenter study showed: the success rate for early laparoscopic intervention for acute SBO is significantly higher after a shorter duration of symptoms (24 h vs 48 h) [75].

After trocar placement, the initial goal is to expose the collapsed distal bowel [74]. This is facilitated with the use of angled telescopes and maximal tilting/rotating of the surgical table. It may also be necessary to move the laparoscope to different trocars to improve visualization. Only pathologic adhesions should be lysed. Additional adhesiolysis only adds to the operative time and to the risks of surgery without benefit. The area lysed should be thoroughly inspected for possible bleeding and bowel injury.

In conclusion, careful selection criteria for laparoscopy [76] may be: (1) Hemodynamic stability and patient not in shock, (2) absence of peritonitis or severe intra-abdominal sepsis, (3) proximal i.e. SB obstruction, (4) localized distension on radiography, and/or (5) absence of severe abdominal distension, (6) anticipated single band, (7) low or intermediate predicted PAI score in < = 3 abdominal quadrants, and last but not least (8) the experience and laparoscopic skills of the surgeon. A partial obstruction is better first approached with a non-operative challenge with hyperosmolar water soluble contrast medium with both therapeutic and diagnostic purposes. A complete SB obstruction should no longer be considered an exclusion criteria for laparoscopic approach.

The experts panel also agreed, as from the cited studies, that laparoscopic lysis of adhesions should be attempted preferably in case of first episode of SBO and/or anticipated single band adhesion (i.e. SBO after appendectomy or hysterectomy). Previous midline incision is not an absolute exclusion criteria for laparoscopic approach.

A multicenter series of 103 patients from the WSES - Iitalian Working Group on peritoneal adhesions and ASBO management, presented at the 2013 Clinical Congress of American College of Surgeons [77], described a safe and effective surgical technique for laparoscopic approach to ASBO and confirmed that laparoscopy should be attempted preferably in case of first episode of SBO and/or anticipated single band adhesion (i.e. SBO after appendectomy or hysterectomy). A low threshold for open conversion should be maintained if extensive adhesions are found, as often occurs in patients with previous midline laparotomy and multiple surgeries. Previous midline laparotomy incision and multiple previous episodes of ASBO with estimated PAI score of > =2 in more than 3 abdominal regions, were significantly associated in this series with increased risk of conversion and longer operative times.

Prevention

We do need to prevent ASBO (LOE 2b GoR B).

In view of the incidence of adhesions and recurrence rates of ASBO as well as of the magnitude of the medical problems and financial burden related to adhesions, prevention or reduction of postoperative adhesions in an important priority. Hyaluronic acid-carboxycellulose membrane and icodextrin are able to reduce adhesions (respectively LOE 1a GOR A and LOE 1b GOR A).

Icodextrin may reduce the risk of re-obstruction for ASBO (LOE 1 b GOR A).

Hyaluronic acid-carboxycellulose can not reduce the need of surgery for ASBO (LOE 1a GOR A).

Most of the available literature is based on gynecologic patients. For general surgical patients no recommendations or guidelines exist.

Any prevention strategy should be safe, effective, practical, and cost effective. A combination of prevention strategies might be more effective [78].

In the same review the authors recommend a laparoscopic approach if possible, the use of bioabsorbable barriers, a meticulous hemostasis, avoiding excessive tissue dissection and ischemia and reducing remaining surgical material [78].

In the long term follow up study from Fevang et al. [79] the surgical treatment itself decreased the risk of future admissions for ASBO, even though the risk of new surgically treated ASBO episodes was the same regardless of the method of treatment (surgical vs conservative).

Intraoperative techniques such as avoiding unnecessary peritoneal dissection, avoiding spillage of intestinal contents or gallstones [80], and the use of starch-free gloves [81-83] are basic principles that should be applied to all patients.

In most abdominal procedures the laparoscopic approach is associated with a significantly lower incidence of adhesive SBO or adhesion-related re-admission [79,83].

There is some class I evidence in obstetrics supporting the theory that suturing the peritoneum increases the risk of adhesions [84].

Concerning mechanical barriers no progresses has been made in the last 6 years. The authors remain convinced that the absorbable adhesion barrier Interceed reduces the incidence of adhesion formation following laparoscopy and laparotomy [85-90]. Gore-Tex may be superior to Interceed in preventing adhesion formation but its usefulness is limited by the need for suturing and later removal [91]. There was no evidence of effectiveness of Seprafilm and Fibrin sheet in preventing adhesion formation [92-99].

Chemical/fluid agents have the theoretical advantage of covering more potential sites of adhesion formation than mechanical barriers.

In the newest P.O.P.A. study Catena et al. randomized 91 patients to have 2000 cc of icodextrin 4% and 90 to have the traditional treatment. The authors noted no significant difference in the incidence of small bowel leakage or anastomotic breakdown; operative times, blood losses, incidence of small bowel resections, return of bowel function, LOS, early and late morbility and mortality was comparable. After a mean follow-up of 41.4 months, there have been 2 cases of ASBO recurrence in the icodextrin group and 10 cases in the control group (p < 0.05). Only one patient in the first group was submitted to surgery showing an Adhesion Severity Score = 2, whereas three patients in the latter group were operated, and the ASS was respectively 3,2 and 3. In accordance with this data, the use of icodextrin 4% solution seems to be safe and effective to prevent intra-abdominal adhesion formation and the risk of re-obstruction [100].

Intergel solution (Lifecore Biomedical, Inc, Chaska, MN), which contains .5% ferric hyaluronate, is another product used for adhesion prevention. In preliminary studies it has been shown to reduce the number, severity, and extent of adhesions in peritoneal surgery [101]. However, the use of Intergel in abdominal surgery in which the gastrointestinal tract was opened still led to an unacceptably high rate of postoperative complications [102].

An interesting experimental finding is the reduction of both number and type of adhesions after postoperative stimulation of gastrointestinal motility by a prokinetic agent [103].

Finally merits mention that peritoneal infusion with cold saline has shown to decrease the degree of postoperative intra-abdominal adhesion formation in an animal model [104].

Adhesions quantification

Among the different adhesions scoring systems which have been proposed mainly by gynecologists, the more complete and easy to use one is the PAI score proposed by Coccolini et al. [105]. In fact, specific attention should be paid to uniformity of measurement. We therefore suggest a regimented classification system for adhesions in an effort to standardize their definition and subsequent analysis. In this way, different surgeons in different treatment centers can more effectively evaluate patients and compare their conditions to past evaluations using a universal classification system (Figure 3). This classification is based on the macroscopic appearance of adhesions and their extent to the different regions of the abdomen. Using specific scoring criteria, clinicians can assign a peritoneal adhesion index (PAI) ranging from 0 to 30, thereby giving a precise description of the intra-abdominal condition [105].

thumbnailFigure 3. Peritoneal adhesion index: by ascribing to each abdomen area an adhesion related score as indicated, the sum of the scores will result in the PAI.

Conclusions

ASBO is a common disease. Non operative management should be attempted in absence of signs of peritonitis or strangulation. WSCM is safe and has a definite role in diagnosis (for predicting the resolution or need for surgery) and therapy (for reducing the operative rate and shortening time to resolution of symptoms and hospital stay). Open surgery for several surgeons still remains the safest and most effective operative approach, although laparoscopic approach appears to be safe and feasible in the hands of experienced laparoscopic surgeons and in selected patients, because there are less overall complications, prolonged ileus rates and pulmonary complication associated with its use. Prevention with hyaluronic acid-carboxycellulose membrane or icodextrin, has actually gained a capital relevance. Adhesions quantification and scoring is a promising development tool for further research towards diagnosis and management of ASBO and peritoneal adhesions prevention.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

FC, SDS: conception and design of the study; organised the consensus conference; preparation of the draft; merged the committee preliminary statements with the observations and recommendations from the panel, summarised the discussion on standards of diagnosis and treatment for ASBO SDS, FC, MG, FeCo manuscript writing, drafting and review. FC, SDS, MDK, JJ organised the consensus conference, merged the committee preliminary statements with the observations and recommendations from the panel, critically contributed to the consensus statements. MDK, WLB, LA, VM, HVG, EEM, JJ contributed to critical discussion of the draft. All authors read and approved the final manuscript.

References

  1. Parker C, Ellis H, Moran BJ, et al.: Postoperative adhesions: ten-year followup of 12,584 patients undergoing lower abdominal surgery.

    Dis Colon Rectum 2001, 44:822-830. PubMed Abstract | Publisher Full Text OpenURL

  2. Ellis: The magnitude of adhesion related problems.

    Ann Chir Gynaecol 1998, 87:9-11. PubMed Abstract OpenURL

  3. Zielinski MD, Bannon MP: Current management of small bowel obstruction.

    Adv in Surg 2011, 45:1-29. Publisher Full Text OpenURL

  4. Galinos B, Branco BC, Beat S, Lydia L, Kenji I, Demetrios D: The incidence and risk factors of post-laparotomy adhesive small bowel obstruction.

    J Gastrointest Surg 2010, 14:1619-1628.

    doi:10.1007/s11605-010-1189-8

    PubMed Abstract | Publisher Full Text OpenURL

  5. Reschef A, Hull TL, Kiran RP: Risk of adhesive obstruction after colorectal surgery: the benefits of the minimally invasive approach may extend well beyond the perioperative period.

    Surg Endosc 2013, 27:1717-1720.

    doi:10.1007/s00464-012-2663-z

    PubMed Abstract | Publisher Full Text OpenURL

  6. Parker C, Wilson MS, Menzies D, et al.: The SCAR-3 study: 5-year adhesionrelated readmission risk following lower abdominal surgical procedures.

    Colorectal Dis 2005, 7:551-558. PubMed Abstract | Publisher Full Text OpenURL

  7. Stewart RM, Page CP, Brender J, et al.: The incidence and risk of early postoperative small bowel obstruction: a cohort study.

    Am J Surg 1987, 154:643-647. PubMed Abstract | Publisher Full Text OpenURL

  8. Howard B, Steven W, Ozeran S: Factors predicting the recurrence of adhesive small-bowel obstruction.

    Am J Surg 1995, 170(4):361-365. PubMed Abstract | Publisher Full Text OpenURL

  9. Barkan Webster S, Ozeran S: Factors predicting the recurrence of adhesive small-bowel obstruction.

    Am J Surg 1995, 170:361-365. PubMed Abstract | Publisher Full Text OpenURL

  10. Miller G, Boman J, Shrier I, Gordon PH: Natural history of patients with adhesive small bowel obstruction.

    Br J Surg 2000, 87(9):1240-1247. PubMed Abstract | Publisher Full Text OpenURL

  11. Di Saverio S, Tugnoli G, Orlandi PE, Catena F, et al.: A 73-year-old man with long-term immobility presenting with abdominal pain.

    PLoS Med 2009, 6:e1000092. PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  12. Obuz F, Terzi C, Sokmen S, Yilmaz E, Yildiz D, Fuzun M: The efficacy of helical CT in the diagnosis of small bowel obstruction.

    Eur J Radiol 2003, 48(3):299-304. PubMed Abstract | Publisher Full Text OpenURL

  13. Trésallet C, Lebreton N, Royer B, Leyre P, Godiris-Petit G, Menegaux F: Improving the management of acute adhesive small bowel obstruction with CT-scan and water-soluble contrast medium: a prospective study.

    Dis Colon Rectum 2009, 52(11):1869-1876. PubMed Abstract | Publisher Full Text OpenURL

  14. Zalcman M, Sy M, Donckier V, Closset J, Gansbeke DV: Helical CT signs in the diagnosis of intestinal ischemia in small-bowel obstruction.

    AJR Am J Roentgenol 2000, 175(6):1601-1607. PubMed Abstract | Publisher Full Text OpenURL

  15. Grassi R, Romano S, D’Amario F, et al.: The relevance of free fluid between intestinal loops detected by sonography in the clinical assessment of small bowel obstruction in adults.

    Eur J Radiol 2004, 50(1):5-14. PubMed Abstract | Publisher Full Text OpenURL

  16. Choi HK, Chu KW, Law WL: Therapeutic value of gastrografin in adhesive small bowel obstruction after unsuccessful conservative treatment: a prospective randomized trial.

    Ann Surg 2002, 236:1-6. PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  17. Srinivasa S, Thakore N, Abbas S, Mahmood M, Kahokehr AA, Hill AG: Impact of Gastrografin in clinical practice in the management of adhesive small bowel obstruction.

    Can J Surg 2011., 54(2) OpenURL

  18. Wadani HAI, Al Awad NI, Hassan KA, Zakaria HM, Al Mulhim AA, Alaqeel FO: Role of water soluble contrast agents in assigning patients to a non-operative course in adhesive small bowel obstruction.

    Oman Med J 2011, 26(6):454-456.

    doi:10.5001/omj.2011.116

    PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  19. Di Saverio S, Catena F, Ansaloni L, Gavioli M, Valentino M, Pinna AD: Watersoluble contrast medium (gastrografin) value in adhesive small intestine obstruction (ASIO): a prospective, randomized, controlled, clinical trial.

    World J Surg 2008, 32(10):2293-2304. PubMed Abstract | Publisher Full Text OpenURL

  20. Barkan H, Webster S, Ozeran S: Factors predicting the recurrence of adhesive small-bowel obstruction.

    Am J Surg 1995, 70:361-365. OpenURL

  21. Ivy L, Shing W, Wong P, Malouf P, Truskett G: Effect of handover on the outcomes of small bowel obstruction in an acute care surgery model.

    ANZ J Surg 2012.

    10.1111/j.1445-2197.2012.06248.x

    OpenURL

  22. Leung AM, Vu H: Factors predicting need for and delay in surgery in small bowel obstruction.

    Am Surg 2012, 78(4):403-407. PubMed Abstract | Publisher Full Text OpenURL

  23. Fleshner PR, Siegman MG, Slater GI, Brolin RE, Chandler JC, Aufses AH Jr: A prospective, randomized trial of short versus long tubes in adhesive small-bowel obstruction.

    Am J Surg 1995, 170(4):366-370. PubMed Abstract | Publisher Full Text OpenURL

  24. Sakakibara T, Harada A, Yaguchi T, Koike M, Fujiwara M, Kodera Y, Nakao A: The indicator for surgery in adhesive small bowel obstruction patient managed with long tube.

    Hepatogastroenterology 2007, 54(75):787-790. PubMed Abstract OpenURL

  25. Moran BJ: Adhesion-related small bowel obstruction.

    Colorectal Dis 2007, 9(Suppl 2):39-44. PubMed Abstract | Publisher Full Text OpenURL

  26. Fevang BT, Jensen D, Svanes K, Viste A: Early operation or conservative management of patients with small bowel obstruction?

    Eur J Surg 2002, 168(8–9):475-481. PubMed Abstract OpenURL

  27. Abbas S, Bissett IP, Parry BR: Oral water soluble contrast for the management of adhesive small bowel obstruction.

    Cochrane Database Syst Rev 2007, 18(3):-CD004651. OpenURL

  28. Branco BC, Barmparas G, Schnüriger B, Inaba K, Chan LS, Demetriades D: Systematic review and meta-analysis of the diagnostic and therapeutic role of water-soluble contrast agent in adhesive small bowel obstruction.

    Br J Surg 2010, 97(4):470-478. PubMed Abstract | Publisher Full Text OpenURL

  29. Landercasper J, Cogbill TH, Merry WH, Stolee RT, Strutt PJ: Long-term outcome after hospitalization for small-bowel obstruction.

    Arch Surg 1993, 128:765-770. PubMed Abstract | Publisher Full Text OpenURL

  30. Schraufnagel D, Rajaee S, Millham FH: How many sunsets?Timing of surgery in adhesive small bowel obstruction: A study of the Nationwide Inpatient Sample.

    J Trauma Acute Care Surg 2013, 74(1):181-187.

    doi:10.1097/TA.0b013e31827891a1 . discussion 187–9

    PubMed Abstract | Publisher Full Text OpenURL

  31. Diaz JJ Jr, Bokhari F, Mowery NT, Acosta JA, Block EF, Bromberg WJ, Collier BR, Cullinane DC, Dwyer KM, Griffen MM, Mayberry JC, Jerome R: Guidelines for management of small bowel obstruction.

    J Trauma 2008, 64(6):1651-1664. PubMed Abstract | Publisher Full Text OpenURL

  32. Guo S-B, Duan Z-J: Decompression of the small bowel by endoscopic long-tube placement.

    World J Gastroenterol 2012, 18(15):1822-1826.

    doi:10.3748/wjg.v18.i15.1822

    PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  33. Assalia A, Kopelman D, Bahous H, Klein Y, Hashmonai M: Gastrografin for mechanical partial, small bowel obstruction due to adhesions.

    Harefuah 1997, 132(9):629-633. PubMed Abstract OpenURL

  34. Choi HK, Law WL, Ho JW, Chu KW: Value of gastrografin in adhesive small bowel obstruction after unsuccessful conservative treatment: a prospective evaluation.

    World J Gastroenterol 2005, 11(24):3742-3745. PubMed Abstract | Publisher Full Text OpenURL

  35. Burge J, Abbas SM, Roadley G, Donald J, Connolly A, Bissett IP, Hill AG: Randomized controlled trial of Gastrografin in adhesive small bowel obstruction.

    ANZ J Surg 2005, 75(8):672-674. PubMed Abstract | Publisher Full Text OpenURL

  36. Wadani HAI, Awad NIA, Hassan KA, Zakaria HM, Abdulmohsen Al Mulhim A, Alaqeel FO: Role of water soluble contrast agents in assigning patients to a Non-operative course in adhesive small bowel obstruction.

    Oman Medical Journal 2011, 26(6):454-456.

    doi:10.5001/omj2011.116

    PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  37. Biondo S, Parés D, Mora L, Martí Ragué J, Kreisler E, Jaurrieta E: Randomized clinical study of Gastrografin administration in patients with adhesive small bowel obstruction.

    J Surg 2003, 90(5):542-546. OpenURL

  38. Abbas SM, Bissett IP, Parry BR: Meta-analysis of oral water-soluble contrast agent in the management of adhesive small bowel obstruction.

    Br J Surg 2007, 94(4):404-411. PubMed Abstract | Publisher Full Text OpenURL

  39. Chen SC, Yen ZS, Lee CC, Liu YP, Chen WJ, Lai HS, Lin FY, Chen WJ: Nonsurgical management of partial adhesive small-bowel obstruction with oral therapy: a randomized controlled trial.

    CMAJ 2005, 173(10):1165-1169. PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  40. Ambiru S, Furuyama N, Kimura F, Shimizu H, Yoshidome H, Miyazaki M, Ochiai T: Effect of hyperbaric oxygen therapy on patients with adhesive intestinal obstruction associated with abdominal surgery who have failed to respond to more than 7 days of conservative treatment.

    Hepatogastroenterology 2008, 55(82–83):491-495. PubMed Abstract OpenURL

  41. Cox MR, Gunn IF, Eastman MC, Hunt RF, Heinz AW: The safety and duration of non-operative treatment for adhesive small bowel obstruction.

    Aust N Z J Surg 1993, 63(5):367-371. PubMed Abstract | Publisher Full Text OpenURL

  42. Shou-Chuan S, Kuo-Shyang J, Lin S-C, et al.: Adhesive small bowel obstruction: How long can patients tolerate conservative treatment?

    World J Gastroenterol 2003, 9(3):603-605. PubMed Abstract | Publisher Full Text OpenURL

  43. Duron JJ, Silva NJ, du Montcel ST, Berger A, Muscari F, Hennet H, Veyrieres M, Hay JM: Adhesive postoperative small bowel obstruction: incidence and risk factors of recurrence after surgical treatment: a multicenter prospective study.

    Ann Surg 2006, 244(5):750-757. PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  44. Scott-Coombes DM, Vipond MN, Thompson JM: General surgeons attitudes to the treatment and prevention of abdominal adhesions.

    Ann R Coll Surg Engl 1993, 75:123-128. PubMed Abstract | PubMed Central Full Text OpenURL

  45. Levrant SG, Bieber E, Barnes R: Risk of anterior abdominal wall adhesions increases with number and type of previous laparotomy.

    J Am Assoc Gynecol Laparosc 1994, 1(4):S19. OpenURL

  46. Van Der Krabben AA, Dijkstra FR, Nieuwenhuijzen M, et al.: Morbidity and mortality of inadvertent enterotomy during adhesiolysis.

    Br J Surg 2000, 87:467-471. PubMed Abstract | Publisher Full Text OpenURL

  47. Tittel A, Treutner KH, Titkova S, et al.: Comparison of adhesion reformation after laparoscopic and conventional adhesiolysis in an animal model.

    Langenbeck's Arch Surg 2001, 386:141-145. PubMed Abstract | Publisher Full Text OpenURL

  48. Tolutope O, Scott W: Helton. Survey opinions on operative management of adhesive small bowel obstruction: laparoscopy versus laparotomy in the state of Connecticut.

    Surg Endosc 2011, 25:2516-2521. PubMed Abstract | Publisher Full Text OpenURL

  49. Gamal EM, Metzger P, Szabo G, et al.: The influence of intraoperative complications on adhesion formation during laparoscopic and conventional cholecystectomy in an animal model.

    Surg Endosc 2001, 15:873-877. PubMed Abstract | Publisher Full Text OpenURL

  50. Gadallah MF, Torres-Rivera C, Ramdeen G, Myrick S, Habashi S, Andrews G: Relationship between intraperitoneal bleeding, adhesions, and peritoneal dialysis catheter failure: a method of prevention.

    Adv Perit Dial 2001, 17:127-129. PubMed Abstract OpenURL

  51. Agresta F, Ansaloni L, Baiocchi GL, Bergamini C, Campanile FC, Carlucci M, Cocorullo G, Corradi A, Franzato B, Lupo M, Mandalà V, Mirabella A, Pernazza G, Piccoli M, Staudacher C, Vettoretto N, Zago M, Lettieri E, Levati A, Pietrini D, Scaglione M, De Masi S, De Placido G, Francucci M, Rasi M, Fingerhut A, Uranüs S, Garattini S: Laparoscopic approach to acute abdomen from the Consensus Development Conference of the Società Italiana di Chirurgia Endoscopica e nuove tecnologie (SICE), Associazione Chirurghi Ospedalieri Italiani (ACOI), Società Italiana di Chirurgia (SIC), Società Italiana di Chirurgia d'Urgenza e del Trauma (SICUT), Società Italiana di Chirurgia nell'Ospedalità Privata (SICOP), and the European Association for Endoscopic Surgery (EAES).

    Surg Endosc 2012, 26(8):2134-2164.

    doi:10.1007/s00464-012-2331-3

    PubMed Abstract | Publisher Full Text OpenURL

  52. Nagle A, Ujiki M, Denham W, Murayama K: Laparoscopic adhesiolysis for small bowel obstruction.

    Am J Surg 2004, 187(4):464-470. PubMed Abstract | Publisher Full Text OpenURL

  53. Szomstein S, Lo Menzo E, Simpfendorfer C, et al.: Laparoscopic lysis of adhesions.

    World J Surg 2006, 30:535-540. PubMed Abstract | Publisher Full Text OpenURL

  54. Ming-Zhe L, Lei L, Long-bin X, Wen-hui W, Yu-long H, Xin-ming S: Laparoscopic versus open adhesiolysis in patients with adhesive small bowel obstruction: a systematic review and meta-analysis.

    Am J Surg 2012., 204(5) OpenURL

  55. Stephanian SA, Apoian VT, Abramian RA, Drampian AF, Eiramdhzian KT: Laparoscopic adhesiolysis in the treatment of acute adhesive obstruction of the small intestine.

    Klin Khir 2011, 7:11-14. PubMed Abstract OpenURL

  56. Vettoretto N, Carrara A, Corradi A, De Vivo G, Lazzaro L, Ricciardelli L, Agresta F, Amodio C, Bergamini C, Catani M, Cavaliere D, Cirocchi R, Gemini S, Mirabella A, Palasciano N, Piazza D, Piccoli M, Rigamonti M, Scatizzi M, Tamborrino E, Zago M: Laparoscopic adhesiolysis: consensus conference guidelines. Colorectal diseases.

    The Association of Coloproctology of great Britain and Ireland 2012, 14:e208-e2015. Publisher Full Text OpenURL

  57. Swank DJ, Swank-Bordewijk SC, Hop WC, van Erp WF, Janssen IM, Bonjer HJ, Jeekel J: Laparoscopic adhesiolysis in patients with chronic abdominal pain: a blinded randomised controlled multi-centre trial.

    Lancet 2003, 361(9365):1247-1251. PubMed Abstract | Publisher Full Text OpenURL

  58. Cirocchi R, Abraha I, Farinella E, Montedori A, Sciannameo F: Laparoscopic versus open surgery in small bowel obstruction.

    Cochrane Database Syst Rev 2010, 17(2):CD007511.

    Review

    OpenURL

  59. Grafen FC, Neuhaus V, Schöb O, Turina M: Management of acute small bowel obstruction from intestinal adhesions: indications for laparoscopic surgery in a community teaching hospital.

    Langenbecks Arch Surg 2010, 395:57-63. OpenURL

  60. Suter M, Zermatten P, Hakic N, et al.: Laparoscopic management of mechanical small bowel obstruction: are there predictors of success or failure?

    Surg Endosc 2000, 14:478-484. PubMed Abstract | Publisher Full Text OpenURL

  61. León EL, Metzger A, Tsiotos GG, et al.: Laparoscopic management of small bowel obstruction: indications and outcomes.

    J Gastrointest Surg 1998, 2:132-140. PubMed Abstract | Publisher Full Text OpenURL

  62. Pekmezci S, Altinli E, Saribeyoglu K, et al.: Enteroclysis-guided laparoscopic adhesiolysis in recurrent adhesive small bowel obstructions.

    Surg Laparosc Endosc Percutan Tech 2001, 12:165-170. OpenURL

  63. O’Connor DB, Winter DC: The role of laparoscopy in the management of acute small bowel obstruction: a review of over 2000 cases.

    Surg Endosc 2012, 26(1):12-17.

    doi:10.1007/s00464-011-1885-9

    PubMed Abstract | Publisher Full Text OpenURL

  64. Navez B, Arimont JM, Guit P: Laparoscopic approach in acute small bowel obstruction. A review of 68 patients.

    Hepatogastroenterology 1998, 45:2146-2150. PubMed Abstract OpenURL

  65. Van Goor H: Consequences and complications of peritoneal adhesions.

    Colorectal Dis 2007, 9(Suppl 2):25-34. PubMed Abstract | Publisher Full Text OpenURL

  66. Sato Y, Ido K, Kumagai M, et al.: Laparoscopic adhesiolysis for recurrent small bowel obstruction: long-term follow-up.

    Gastrointest Endosc 2001, 54:476-479. PubMed Abstract | Publisher Full Text OpenURL

  67. Chosidow D, Johanet H, Montario T, et al.: Laparoscopy for acute smallbowel obstruction secondary to adhesions.

    J Laparoendosc Adv Surg Tech 2000, 10:155-159. Publisher Full Text OpenURL

  68. Farinella E, Cirocchi R, La Mura F, Morelli U, Cattorini L, Delmonaco P, Migliaccio C, De Sol AA, Cozzaglio L: Sciannameo F Feasibility of laparoscopy for small bowel obstruction.

    World J Emerg Surg 2009, 4:3. PubMed Abstract | BioMed Central Full Text | PubMed Central Full Text OpenURL

  69. Levard H, Boudet MJ, Msika S, et al.: Laparoscopic treatment of acute small bowel obstruction: a multicentre retrospective study.

    A N Z J Surg 2001, 71:641-646. Publisher Full Text OpenURL

  70. Wullstein C, Gross E: Laparoscopic compared with conventional treatment of acute adhesive small bowel obstruction.

    Br J Surg 2003, 90:1147-1151. PubMed Abstract | Publisher Full Text OpenURL

  71. Khaikin M, Schneidereit N, Cera S, Sands D, Efron J, Weiss G, Nogueras JJ, Vernava AM, Wexner SD: Laparoscopic vs. open surgery for acute adhesive small-bowel obstruction: patient’ outcome and costeffextiveness.

    Surg Endosc 2007, 21:742-746. PubMed Abstract | Publisher Full Text OpenURL

  72. Peschaud F, Alves A, Berdah S, Kianmanesh R, Lurent C, Ma Brut JY, Mariette C, Meurette G, Pirro N, Veryrie N, Slim K: Indicazioni alla laparoscopia in chirurgia generale e digestiva.

    J Chir 2006, 6:65-79. OpenURL

  73. Franklin ME, Gonzales JJ, Miter DB, Glass JL, Paulson D: Laparoscopic diagnosis and treatment of intestinal obstruction.

    Surg Endosc 2004, 18:26-30. PubMed Abstract | Publisher Full Text OpenURL

  74. Catena F, Di Saverio S, Ansaloni L, et al.: CHAPTER 7 Adhesive Small Bowel Obstruction. In Updates in Surgery: The Role of Laparoscopy in Emergency Abdominal Surgery. Edited by Mandalà V. Verlag Italia: Springer; 2012:89-104.

    10.1007/978-88-470-2327-7. ISBN 978-88-470-2326-0

    OpenURL

  75. Levard H, Boudet MJ, Msika S, Molkhou JM, Hay JM, Laborde Y, et al.: French association for surgical research. Laparoscopic treatment of acute small bowel obstruction: a multicentre retrospective study.

    Aust N Z J Surg 2001, 71:641-646. Publisher Full Text OpenURL

  76. Duh QY: Small bowel obstruction. In Endosurgery. Edited by Toouli J, Gossot D, Hunter JG. New York: Churchill Livingstone; 1998:425-431. OpenURL

  77. Di Saverio S, Vettoretto N, Catena F, Italian Working Group on Peritoneal Adhesions and Asbo Management, et al.: Elasbo study: emergency laparoscopy for relief of adhesive small-bowel obstruction: indications, technique, and results in 103 cases from a multicenter study of the WSES.

    Clin Congr Am Coll Surg, Oral Free paper Sess Gen Surg

    ISP062013

    OpenURL

  78. Schnüriger B, Barmparas G, Branco BC, Lustenberger T, Inaba K, Demetriades D: Prevention of Postoperative peritoneal adhesions: a review of the literature.

    Am J Surg 201(1):111-121. OpenURL

  79. Fevang BT, Fevang J, Lie SA, Søreide O, Svanes K, Viste A: Long-term prognosis after operation for adhesive small bowel obstruction.

    Ann Surg 2004, 240(2):193-201. PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  80. Soybir GR, Koksoy F, Polat C, et al.: The effects of sterile or infected bile and dropped gallstones in abdominal adhesions and abscess formation.

    Surg Endosc 1997, 11:711-713. PubMed Abstract | Publisher Full Text OpenURL

  81. Van den Tol P, Haverlag R, van Rossen ME, et al.: Glove powder promotes adhesion formation and facilitates tumour cell adhesion and growth.

    Br J Surg 2001, 88:1258-1263. PubMed Abstract | Publisher Full Text OpenURL

  82. Cooke A, Hamilton DG: The significance of starch powder contamination in the aetiology of peritoneal adhesions.

    Br J Surg 1977, 64:410-412. PubMed Abstract | Publisher Full Text OpenURL

  83. Barmparas G, Branco BC, Schnüriger B, Lam L, Inaba K, Demetriades D: The incidence and risk factors of post-laparotomy adhesive small bowel obstruction.

    J Gastrointest Surg 2010, 14(10):1619-1628. PubMed Abstract | Publisher Full Text OpenURL

  84. Malvasi A, Tinelli A, Farine D, et al.: Effects of visceral peritoneal closure on scar formation at cesarean delivery.

    Int J Gynecol Obstet 2009, 105:131-135. Publisher Full Text OpenURL

  85. Adhesion Barrier Study Group: Prevention of postsurgical adhesions by INTERCEED(TC7), an absorbable adhesion barrier: a prospective randomized multicenter clinical study. INTERCEED(TC7).

    Fertil Steril 1989, 51(6):933-938. PubMed Abstract OpenURL

  86. Saravelos H, Li TC: Post-operative adhesions after laparoscopic electrosurgical treatment for polycystic ovarian syndrome with the application of Interceed to one ovary: a prospective randomized controlled study.

    Hum Reprod 1996, 11(5):992-997. PubMed Abstract | Publisher Full Text OpenURL

  87. Azziz R, Adhesion Barrier Study Group: Microsurgery alone or with INTERCEED absorbable adhesion barrier for pelvic sidewall adhesion re-formation: The INTERCEED (TC7). II.

    Surg Gynecol Obstet 1993, 177:135-139. PubMed Abstract OpenURL

  88. Nordic Adhesion Prevention Study Group: The efficacy of Interceed (TC7)* for prevention of reformation of postoperative adhesions on ovaries, fallopian tubes, and fimbriae in microsurgical operations for fertility: a multicenter study.

    Fertil Steril 1995, 63:709-714. PubMed Abstract OpenURL

  89. Wiseman DM, Trout JR, Franklin RR, et al.: Metaanalysis of the safety and efficacy of an adhesion barrier (Interceed TC7) in laparotomy.

    J Reprod Med 1999, 44:325-331. PubMed Abstract OpenURL

  90. Ahmad G, Duffy JM, Farquhar C, et al.: Barrier agents for adhesion prevention after gynaecological surgery.

    Cochrane Database Syst Rev 2008, 16:CD000475. OpenURL

  91. Montz FJ, Monk BJ, Lacy SM: The gore-Tex surgical membrane: effectiveness as a barrier to inhibit postradical pelvic surgery adhesions in a porcine model.

    Gynecol Oncol 1992, 45:290-293. PubMed Abstract | Publisher Full Text OpenURL

  92. Beck DE, Cohen Z, Fleshman JW, et al.: A prospective, randomized, multicenter, controlled study of the safety of Seprafilm adhesion barrier in abdominopelvic surgery of the intestine.

    Dis Colon Rectum 2003, 46:1310-1319. PubMed Abstract | Publisher Full Text OpenURL

  93. Becker M, Dayton MT, Fazio VW, et al.: Prevention of postoperative abdominal adhesions by a sodium hyaluronate-based bioresorbable membrane: a prospective, randomized, double-blind multicenter study.

    J Am Coll Surg 1996, 183:297-306. PubMed Abstract OpenURL

  94. Vrijland WW, Tseng LN, Eijkman HJ, et al.: Fewer intraperitoneal adhesions with use of hyaluronic acid-carboxymethylcellulose membrane: a randomized clinical trial.

    Ann Surg 2002, 235:193-199. PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  95. Cohen Z, Senagore AJ, Dayton MT, et al.: Prevention of postoperative abdominal adhesions by a novel, glycerol/sodium hyaluronate/carboxymethylcellulose-based bioresorbable membrane: a prospective, randomized, evaluator-blinded multicenter study.

    Dis Colon Rectum 2005, 48:1130-1139. PubMed Abstract | Publisher Full Text OpenURL

  96. Kumar S, Wong PF, Leaper DJ: Intra-peritoneal prophylactic agents for preventing adhesions and adhesive intestinal obstruction after nongynaecological abdominal surgery.

    Cochrane Database Syst Rev 2009, 1:CD005080. PubMed Abstract | Publisher Full Text OpenURL

  97. Fazio VW, Cohen Z, Fleshman JW, et al.: Reduction in adhesive smallbowel obstruction by Seprafilm adhesion barrier after intestinal resection.

    Dis Colon Rectum 2006, 49:1-11. PubMed Abstract | Publisher Full Text OpenURL

  98. Kudo FA, Nishibe T, Miyazaki K, et al.: Use of bioresorbable membrane to prevent postoperative small bowel obstruction in transabdominal aortic aneurysm surgery.

    Surg Today 2004, 34:648-651. PubMed Abstract | Publisher Full Text OpenURL

  99. Zeng Q, Yu Z, You J, Zhang Q: Efficacy and safety of Seprafilm for preventing postoperative abdominal adhesion: systematic review and meta-analysis.

    World J Surg 2007, 31(11):2125-2131. PubMed Abstract | Publisher Full Text OpenURL

  100. Catena F, Ansaloni L, Di Saverio S, Pinna AD, P.O.P.A. Study: Prevention of postoperative abdominal adhesions by icodextrin 4% solution after laparotomy for adhesive small bowel obstruction. A prospective randomized controlled trial.

    J Gastrointest Surg 2012, 16:382-388. PubMed Abstract | Publisher Full Text OpenURL

  101. Johns DA, Ferland R, Dunn R: Initial feasibility study of a sprayable hydrogel adhesion barrier system in patients undergoing laparoscopic ovarian surgery.

    J Am Assoc Gynecol Laparosc 2003, 10:334-338. PubMed Abstract | Publisher Full Text OpenURL

  102. Tang CL, Jayne DG, Seow-Choen F, et al.: A randomized controlled trial of.5% ferric hyaluronate gel (Intergel) in the prevention of adhesions following abdominal surgery.

    Ann Surg 2006, 243:449-455. PubMed Abstract | Publisher Full Text | PubMed Central Full Text OpenURL

  103. Sparnon AL, Spitz L: Pharmacological manipulation of postoperative intestinal adhesions.

    Aust N Z J Surg 1989, 59:725-729. PubMed Abstract | Publisher Full Text OpenURL

  104. Fang CC, Chou TH, Lin GS, Yen ZS, Lee CC, Chen SC: Peritoneal infusion with cold saline decreased postoperative intra-abdominal adhesion formation.

    World J Surg 2010, 34(4):721-727. PubMed Abstract | Publisher Full Text OpenURL

  105. Coccolini F, Ansaloni L, Manfredi R, Campanati L, Poiasina E, Bertoli P, Capponi MG, Sartelli M, Di Saverio S, Cucchi M, Lazzareschi D, Pisano M, Catena F: Peritoneal adhesion index (PAI): proposal of a score for the “ignored iceberg” of medicine and surgery.

    World J Emerg Surg 2013, 8(1):6. PubMed Abstract | BioMed Central Full Text | PubMed Central Full Text OpenURL