Abdominal adhesiolysis: inpatient care and expenditures in the United States in 1994

Use of Small Bowel Follow Through in Management of Small Bowel Obstruction

BACKGROUND

Small bowel obstructions (SBOs) are a burden to healthcare. Despite a common disease, significant inconsistencies exist within management, specifically use of small bowel follow through (SBFT). We evaluated patients who had SBFT and the early vs late use of SBFT on outcomes.

STUDY DESIGN

A retrospective chart review was performed for 799 patients with SBO admitted between 2012 and 2019. Patients between 18 and 89 years of age were included and those who required emergent operations on admission were excluded. The groups were evaluated by having SBFT compared with not, and further delineated on SBFT performance before (early) or after (late) 48 hours.

RESULTS

Of the 799 patients with an SBO, 757 (94.7%) had SBFT and 42 (5.2%) did not. Of those 757, 476 (62.8%) performed early and 281 (37.1%) completed late. In patients who received SBFT, the length of stay (LOS) was shorter (p < 0.003). If patients were admitted to the surgical service, they were more likely to receive an SBFT (p < 0.0042). When SBFT was early, patients were more frequently admitted to an academic institution (p < 0.0001) and to a surgical service (p < 0.0001), had decreased LOS (p < 0.001), decreased readmissions (p < 0.0001), were less likely to require surgery (p < 0.0009), had decreased time to operation (p < 0.0001), and had quicker operation to discharge (p < 0.0005).

CONCLUSIONS

The use of SBFT for SBO resulted in improved outcomes, especially if performed early. This is supportive of surgical service admission with more frequent early SBFT with decreased LOS. There is a propensity for those patients with previous operations to have SBFT later in hospital stay and may correlate with increased need for surgery, and the use of early SBFT may help resolve SBO. Implementing early SBFT may improve outcomes and an area of future endeavors.

Development of a novel postoperative adhesion induction model in cynomolgus monkeys with high reliability and reproducibility

Postoperative adhesions frequently occur following abdominal surgical interventions, leading to serious morbidities and requiring new therapeutic strategies. The development of new therapeutic agents to reduce postoperative adhesions needs animal models that closely mirror human pathophysiology. In this study, we established a novel surgical adhesion model in cynomolgus monkeys, which are characteristically similar to humans. Our model reliably and reproducibly developed adhesions. Histopathological analyses revealed that monkeys undergoing our novel surgery method exhibited changes consistent with those in monkeys that underwent open abdominal surgery. Furthermore, the cellular components of the adhesion tissue in our monkey model reflected those reported in human adhesion tissue. Furthermore, time-course transcriptomic analyses showed that our model accurately recapitulates the well-known progression cascade of postoperative adhesions. In addition, it identified the upregulation of gene that is absent in rodents. We expect our novel surgical method to be a promising tool for elucidating the detailed biology of postoperative adhesions and for assessing new therapeutic treatments with high translatability to human biology.

Adhesion barriers in gynecologic surgeries and cesarean section: An Asia-Pacific expert panel consensus recommendation

Adhesions arising from gynecologic surgeries and cesarean sections pose substantial clinical, social, and economic challenges, leading to issues like pelvic pain, infertility, bowel obstruction, and recurring surgeries. Preventing adhesions is a pressing unmet need, hindered by difficulties in assessing postoperative adhesions and understanding barriers. To bridge adhesion prevention gaps, statements on clinical practices were synthesized to present Asia-Pacific expert perspectives on gynecologic surgery and cesarean section adhesion prevention. An expert panel of eight physicians from various healthcare settings in the Asia-Pacific region was convened and a comprehensive literature search on topics related to adhesion prevention in gynecologic surgeries and cesarean sections was performed. Information from full-text publications was used to develop draft consensus statements, with each statement assigned the highest available evidence level based on a systematic literature review and graded using the Oxford Center for Evidence-based Medicine criteria. A modified Delphi process, involving two rounds of online voting and discussions with an extended group of 109 experts, was employed to reach a consensus on six topics related to adhesion barriers. A set of 15 consensus statements were synthesized. Key topics include adhesion incidence in Asia, cesarean section complications, barrier application status, adhesion formation and prevention, absorbable barriers' effectiveness, recommendations, and future considerations. The statements provide guidance for healthcare professionals, especially in the Asia-Pacific region, to tackle the challenges posed by postoperative adhesions and improve patient outcomes. Further research is needed to enhance understanding and prevention of adhesions in this region.

Bedside Small Bowel Follow-Through: The Role in the Management of Adhesive Small Bowel Obstruction

BACKGROUND

 Adhesive small bowel obstruction (ASBO) accounts for the majority of hospitalizations related to SBO following abdominal surgery. Delays in the management of ASBO are associated with longer hospital stays and increased mortality rates, making it imperative to establish an efficient way of determining which patients need surgical intervention.

PURPOSE

To evaluate the contribution of bedside small bowel follow-through (BSBFT) in the management of suspected ASBO.

MATERIALS AND METHODS

A single-site analysis of 320 patients who underwent BSBFT from August 2015 to 2019 was retrospectively performed. The presence of contrast in the colon on abdominal radiographs obtained at eight and 24 hours after administration and subsequent management (conservative versus surgical) was recorded.

RESULTS

Of the 320 BSBFT exams, 235 cases had colonic contrast present at eight hours. Twelve of those cases received surgical treatment, while the remaining 223 were managed conservatively. Forty-three cases showed colonic contrast at 24 hours despite not showing contrast at eight hours. Of these cases, 29 patients were managed conservatively, while 14 patients underwent surgery. Forty-two cases had no contrast at 24 hours, and 33 patients of those patients subsequently received surgical intervention, while nine were managed conservatively. Patients who had contrast on radiographs and underwent surgical interventions had either high clinical concern for postoperative complications or stagnant clinical progression.

CONCLUSION

BSBFT helps determine the management for suspected ASBO. ​Patients with colonic contrast on eight- or 24-hour abdominal images were more likely to be managed conservatively. However, the clinical context is important, since clinical factors may overrule the results of the BSBFT.

Abdominal Instillation of Crystalloid Fluid Decreases the Recurrence of Adhesive Small Bowel Obstruction

Peritoneal adhesion is a common cause of small bowel obstruction (SBO). In this study, we included 40 adult patients who had SBO, or partial obstructive symptoms. In the abdominal instillation of crystalloid fluid (AICF) cohort, 16 patients underwent lysis of adhesions and abdominal crystalloid fluid instillation at the end of the procedure. In the control (CO) group, 24 patients received lysis of adhesions without fluid instillation. AICF was achieved by the abdominal instillation of 1864 ± 97.5 mL of crystalloid fluid. We analyzed the recurrence of peritoneal adhesions resulting in reoperation for SBO within the 64.3 ± 9.15 months of follow-up time for the CO and the 70.5 ± 13.16-month follow-up for the AICF group. The AICF group had a lower SBO recurrence rate of 12.5% compared to the CO group's 41.6% rate (P = .049). Taken together, AICF decreased the recurrence of SBO requiring reoperation secondary to adhesion formation compared to the lysis of adhesions alone, as seen in the CO group.

Ovulation provides excessive coagulation and hepatocyte growth factor signals to cause postoperative intraabdominal adhesions

Postoperative adhesions show a higher occurrence in females aged 16-60, especially after pelvic surgeries. This study explores the role of ovulation in adhesion formation in mice. Ovarian surgery in mice with normal- or super-ovulation led to pronounced adhesions, whereas ovulation-defective Pgr-KO mice showed minimal adhesions. Specifically, exposure to ovulatory follicular fluid (FF) markedly increased the adhesion. The hazardous exposure time window was one day before to 2.5 days after the surgery. Mechanistically, early FF exposure triggered adhesions via the blood coagulation cascade, while later exposure relied on the HGF/cMET signaling pathway. Prophylactic administration of a thrombin inhibitor pre-operatively or a cMET inhibitor postoperatively effectively mitigated FF-induced adhesions, while COX inhibitor treatment exhibited no discernible effect. These findings underscore ovulation as a pivotal factor in the development of pelvic wound adhesions and advocate for targeted preventive strategies such as c-MET inhibition, scheduling surgeries outside the ovulatory period, or employing oral contraceptive measures.

Comparison of the effect between traditional conservation and nasointestinal tube placement in adhesive small bowel obstruction: A matched case-control study

Adhesive small bowel obstruction (ASBO) causes a major burden in emergency medicine. Owing to in situ decompression, nasointestinal tube (NIT) placement has been increasingly used in clinical practice compared with traditional conservation (TC); however, the indications remain controversial. This study was designed to explore the indications for each treatment in ASBOs and then suggest the optimal strategy. After propensity score matching, 128 pairs were included (the NIT and TC groups). The occurrence of severe adverse events (SAEs), peri-treatment clinical parameters, and radiological features were compared between the successful and failed treatment groups. According to different stages of the entire treatment, the independent risk factors for adverse effects for ASBO were analysed in phase I and phase II. In phase I, normal red blood cells (RBC) levels (p = 0.011) and a balanced sodium ion level (p = 0.016) positively affected the outcomes of TC treatment. In phase II, for the TC group, the successful treatment rate reached 79.5% for patients with ASBOs whose normal RBC levels (p = 0.006) or decreasing white blood cells (WBC) levels (p = 0.014) after treatment. For the NIT group, the treatment success rate was 68.1% for patients whose electrolyte imbalance could be reversed or whose neutrophil count/lymphocyte ratio (NLR) levels was lower than 4.3 (p = 0.018). TC treatment is highly recommended for patients with normal RBC counts and sodium levels pretreatment. After dynamic monitoring of the treatment process, for both the TC and NIT groups, once ASBOs had elevated inflammatory biomarkers or irreversible electrolyte disturbances, surgical interference was preferred.

Prediction of bowel necrosis by reduced bowel wall enhancement in closed-loop small bowel obstruction: Quantitative methods

PURPOSE

To assess diagnostic performance and reproducibility of reduced bowel wall enhancement evaluated by quantitative methods using CT to identify bowel necrosis among closed-loop small bowel obstruction (CL-SBO) patients.

METHODS

This retrospective single-center study included patients who diagnosed with CL-SBO caused by adhesion or internal hernia during January 2016 and May 2022. Patients were divided into necrotic group (n = 41) and non-necrotic group (n = 67) according to surgical exploration and postoperative pathology. Two doctors independently measured the attenuation of bowel wall and consensus was reached through panel discussion with a third gastrointestinal radiologist. Reduced bowel wall enhancement was assessed by four quantitative methods. Univariate analyses were used to evaluate the association between each method and bowel necrosis, and kappa/intraclass correlation coefficient values were used to assess interobserver agreement. Diagnostic performance parameters were calculated for each method.

RESULTS

Reduced bowel wall enhancement in arterial phase (OR 8.98, P < 0.0001), reduced bowel wall enhancement in portal phase (OR 16.84, P < 0.001), adjusted reduced bowel wall enhancement in arterial phase (OR 29.48, P < 0.001), adjusted reduced bowel wall enhancement in portal phase (OR 145.69, P < 0.001) were significantly associated with bowel necrosis. Adjusted reduced bowel wall enhancement in portal phase had the best diagnostic performance (AUC: 0.92; Youden index: 0.84; specificity: 94.03 %) and interobserver agreement (kappa value of 0.59-0.73) to predict bowel necrosis.

CONCLUSION

When assessing reduced bowel enhancement to predict bowel necrosis among CL-SBO patients, using unenhanced CT images and proximal dilated loop as standard references in portal phase is the most accurate quantitative method among those tested.

[Comparison of early operative treatment and 48-hour conservative treatment in small bowel obstruction (COTACSO): intermediate results]

Optimal treatment for adhesive small bowel obstruction (SBO) is not defined. Surgery is the only method of treatment for obvious strangulating SBO. Non-operative management (NOM) is widely used among patients with low risk of strangulation, i.e. no clinical, laboratory and CT signs. Randomized controlled trials (RCTs) are recommended to determine the optimal method (early intervention or NOM), but their safety is unclear due to possible delay in surgery for patients needing early intervention.

MATERIAL AND METHODS

A RCT is devoted to outcomes of early operative treatment and NOM for adhesive SBO. The estimated trial capacity is 200 patients. Thirty-two patients were included in interim analysis. In 12 hours after admission, patients without apparent signs of strangulation were randomized into two clinical groups after conservative treatment. Group I included 12 patients who underwent immediate surgery, group II - 20 patients after 48-hour NOM. The primary endpoint was success of non-surgical regression of SBO and reduction in mortality. To evaluate patient safety, we analyzed mortality, complication rates and bowel resection in this RCT with previously published studies.

RESULTS

In group I, all 12 (100%) patients underwent surgery. Only 4 (20%) patients required surgery in group II. Mortality, complication rates and bowel resection rates were similar in both groups. Strangulating SBO was found in 8 (25%) patients. Overall mortality was 6.3%, bowel resection rate - 6.3%, iatrogenic perforation occurred in 3 (18.8%) patients. These values did not exceed previous findings.

CONCLUSION

Non-operative management within 48 hours prevented surgery in 80% of patients with SBO. Interim analysis found no significant between-group differences in mortality, complication rates and bowel resection rate. Patients had not been exposed to greater danger than other patients with adhesive SBO. The study is ongoing.

Survey of Diagnostic and Management Practices in Small Bowel Obstruction: Individual and Generational Variation Despite Practice Guidelines

Background: Small bowel obstruction (SBO) is a common disorder managed by surgeons. Despite extensive publications and management guidelines, there is no universally accepted approach to its diagnosis and management. We conducted a survey of acute care surgeons to elucidate their SBO practice patterns.Methods: A self-report survey of SBO diagnosis and management practices was designed and distributed by email to AAST surgeons who cared for adult SBO patients. Responses were analyzed with descriptive statistics and Chi-square test of independence at α = .05.Results: There were 201 useable surveys: 53% ≥ 50 years, 77% male, 77% at level I trauma centers. Only 35.8% reported formal hospital SBO management guidelines. Computed tomography (CT) scan was the only diagnostic exam listed as "essential" by the majority of respondents (82.6%). Following NG decompression, 153 (76.1%) would "always/frequently" administer a water-soluble contrast challenge (GC). There were notable age differences in approach. Compared to those ≥50 years, younger surgeons were less likely to deem plain abdominal films as "essential" (16.0% vs 40.2%; P < .01) but more likely to require CT scan (88.3% vs 77.6%; P = .045) for diagnosis and to "always/frequently" administer GC (84.0% vs 69.2%; P < .01). Younger surgeons used laparoscopy "frequently" more often than older surgeons (34.0% vs 21.5%, P = .05).Discussion: There is significant variation in diagnosis and management of SBO among respondents in this convenience sample, despite existing PMGs. Novel age differences in responses were observed, which prompts further evaluation. Additional research is needed to determine whether variation in practice patterns is widespread and affects outcomes.

Update on antiadhesion barriers and therapeutics in gynecological surgery

PURPOSE OF REVIEW

Postoperative adhesions remain a clinical challenge to both patients and providers, as they are associated with significant complications and a high economic burden. This article provides a clinical review of currently available antiadhesive agents and promising new therapies that have advanced past animal studies.

RECENT FINDINGS

Several agents have been investigated on their ability to reduce adhesion formation; however, there is no widely acceptable option. The few available interventions are barrier agents and while low-quality evidence suggests that they may be more effective than no treatment, there is no general agreement on their overall efficacy. There is an abundance of research on new solutions; however, their clinical efficacy is yet to be determined.

SUMMARY

Although a wide range of therapeutics have been investigated, majority are halted in animal models with only a select few being studied in humans and ultimately available in the market. Many agents have shown effectiveness in reducing adhesion formation, however, that has not been translated to improvement in clinically relevant outcomes; hence the need for high-quality large randomized trials.

Geographic Variation in Operative Management of Adhesive Small Bowel Obstruction

INTRODUCTION

Variation in surgical management exists nationally. We hypothesize that geographic variation exists in adhesive small bowel obstruction (aSBO) management.

MATERIALS AND METHODS

A retrospective analysis of a national commercial insurance claims database (MarketScan) sample (2017-2019) was performed in adults with hospital admission due to aSBO. Geographic variation in rates of surgical intervention for aSBO was evaluated by state and compared to a risk-adjusted national baseline using a Bayesian spatial rates Poisson regression model. For individual-level analysis, patients were identified in 2018, with 365-d look back and follow-up periods. Logistic regression was performed for individual-level predictors of operative intervention for aSBO.

RESULTS

Two thousand one hundred forty-five patients were included. State-level analysis revealed rates of operative intervention for aSBO were significantly higher in Missouri and lower in Florida. On individual-level analysis, age (P < 0.01) and male sex (P < 0.03) but not comorbidity profile or prior aSBO, were negatively associated with undergoing operative management for aSBO. Patients presenting in 2018 with a history of admission for aSBO the year prior experienced a five-fold increase in odds of representation (odds ratio: 5.4, 95% confidence interval: 3.1-9.6) in 2019. Patients who received an operation for aSBO in 2018 reduced the odds of readmission in the next year by 77% (odds ratio: 0.23, 95% confidence interval: 0.1-0.5). The volume of operations performed within a state did not influence readmission.

CONCLUSIONS

Surgical management of aSBO varies across the continental USA. Operative intervention is associated with decreased rates of representation in the following year. These data highlight a critical need for standardized guidelines for emergency general surgery patients.

Neutralization of excessive levels of active TGF-β1 reduces MSC recruitment and differentiation to mitigate peritendinous adhesion

Peritendinous adhesion formation (PAF) can substantially limit the range of motion of digits. However, the origin of myofibroblasts in PAF tissues is still unclear. In this study, we found that the concentration of active TGF-β1 and the numbers of macrophages, mesenchymal stromal cells (MSCs), and myofibroblasts in human and mouse adhesion tissues were increased. Furthermore, knockout of TGF-β1 in macrophages or TGF-β1R2 in MSCs inhibited PAF by reducing MSC and myofibroblast infiltration and collagen I and III deposition, respectively. Moreover, we found that MSCs differentiated into myofibroblasts to form adhesion tissues. Systemic injection of the TGF-β-neutralizing antibody 1D11 during the granulation formation stage of PAF significantly reduced the infiltration of MSCs and myofibroblasts and, subsequently, PAF. These results suggest that macrophage-derived TGF-β1 recruits MSCs to form myofibroblasts in peritendinous adhesions. An improved understanding of PAF mechanisms could help identify a potential therapeutic strategy.

Utility of Abbreviated Small Bowel Follow Through Study in the Management of Small Bowel Obstruction

INTRODUCTION

Small bowel obstruction is a common surgical complaint. Most small bowel obstructions are managed successfully nonoperatively. Unanimous guidelines for nonoperative management of small bowel obstruction do not exist.

METHODS

A standardized protocol for water-soluble contrast administration and abbreviated small bowel follow through imaging was implemented in January of 2021. A retrospective chart review identified 111 patients admitted for SBO from 6/2019 to 9/2019 for a control group. A planned follow-up review identified 158 patients managed according to the new protocol from 3/2021 to 10/2021. The primary outcome was in-hospital length of stay. Standard statistical analyses were performed and pre-specified.

RESULTS

Before implementation of the standardized protocol patients that were managed strictly nonoperatively, the mean length of stay (LOS) was 8.3 days. After implementation, the average LOS was 4.8 (P < .0001). Comparatively, patients admitted after protocol implementation were more likely to undergo CT scan with PO contrast on admission (98.1% vs 90.1%; P < .005), undergo NG tube decompression (84.7% vs 68.5%; P < .005), and undergo water-soluble contrast with abbreviated or formal SBFT (75.3% vs 37.8%; P < .0001).

CONCLUSION

Implementation of a standardized protocol utilizing abbreviated SBFT with water-soluble contrast for the management of SBO at our institution resulted in a decrease in the average length of stay for patients definitively managed in a nonoperative fashion.

An Overview of Postoperative Intraabdominal Adhesions and Their Role on Female Infertility: A Narrative Review

Postoperative intraabdominal adhesions can occur after more than 90% of gynecologic surgeries. They not only cause chronic pelvic pain and small bowel obstruction, but are also one of the main reasons for infertility. Adhesions are not only a burden for the affected patients, but are also a burden for the healthcare system, since the treatment of adhesion-associated complications costs a considerable amount of money. The gold standard for the diagnosis of adhesions is by laparoscopy, although other methods, such as transvaginal hydro-laparoscopy, are being discussed as better alternatives. Ideally, adhesions are avoided inherently, by operating carefully and by using microsurgical principles. If this is not possible, gel barriers have been shown to be successful in reducing postoperative adhesions.

Outcomes of Small Bowel Obstructions by Admitting Specialty and Hospital Type

BACKGROUND

Small bowel obstructions (SBOs) account for a significant burden on the health care system. Should the ongoing trend of regionalizing medicine extend to these patients? We investigated if there is a benefit to admitting SBOs to larger teaching hospitals and to surgical services.

METHODS

We performed a retrospective chart review of 505 patients admitted to a Sentara Facility between 2012 and 2019 with a diagnosis of SBO. Patients between the ages of 18 and 89 were included. Patients were excluded if they required emergent operation. Outcomes were evaluated based on patient's admission either to a teaching or community hospital as well as the admitting service's specialty.

RESULTS

Of 505 patients admitted with a SBO, 351 (69.5%) were admitted to a teaching hospital. 392 (77.6%) patients were admitted to a surgical service. The average length of stay (LOS) (4 vs 7 days, P < .0001) and cost ($18,069.79 vs $26,458.20, P < .0001) were lower at teaching hospitals. The same trends in LOS (4 vs 7 days, P < .0001) and cost ($18,265.10 vs $29 944.82, P < .0001) were seen with surgical services. The 30-day readmission rate was higher in teaching hospitals (18.2% vs 11%, P = .0429), and no difference was seen in operative rate or mortality.

DISCUSSION

These data would suggest that there is a benefit to admitting SBO patients to larger teaching hospitals and to surgical services with regard to LOS and cost, suggesting that these patients might benefit from treatment at centers with emergency general surgery (EGS) Services.

Economic Consequences of Surgery for Adhesive Small Bowel Obstruction: A Population-Based Study

Background and Aims

Most patients develop adhesions after abdominal surgery, some will be hospitalized with small bowel obstruction (SBO), and some also require surgery. The operations and follow-up are expensive, but recent data of costs are scarce. The aim of this study was to describe the direct costs of SBO-surgery and follow-up, in a population-based setting. The association between cost of SBO and peri- and postoperative data was also studied.

Methods

In a retrospective cohort study, all patients (n = 402) operated for adhesive SBO in Gävleborg and Uppsala counties (2007-2012) were studied. The median follow-up was 8 years. Costs were calculated according to the pricelist of Uppsala University Hospital, Uppsala, Sweden.

Results

Overall total costs were €16.267 million, corresponding to a mean total cost per patient of €40,467 during the studied period. Diffuse adhesions and postoperative complications were associated with increased costs for SBO in a multivariable analysis (P < 0.001). Most costs, about €14 million (85%), arouse in conjunction with the SBO-index surgery period. In-hospital stay was the dominating cost, accounting for 70% of the total costs.

Conclusion

Surgery for SBO generates substantial economic burden for healthcare systems. Measures that reduce the incidence of SBO, the frequency of postoperative complication, or the length of stay have the potential to reduce this economic burden. The cost estimates from this study may be valuable for future cost-benefit analyses in intervention studies.

Diagnostic nomogram for closed-loop small bowel obstruction requiring emergency surgery

PURPOSE

This study aimed to build a diagnostic model of closed-loop small bowel obstruction (CL-SBO) using clinical information, blood test results, and computed tomography (CT) findings.

METHODS

All patients who were diagnosed with small bowel obstruction (SBO) and underwent surgery between January 1, 2018, and October 31, 2021, in the affiliated hospital of Qingdao university were reviewed, and their relevant preoperative information was collected. All variables were selected using univariate analysis and backward stepwise regression to build a diagnostic nomogram model. K-fold cross-validation and bootstrap resampling techniques were used for internal validation, and data from Qingdao Central Hospital were used for external validation. We also evaluated the diagnostic performance of each CT finding and performed subgroup analysis according to bowel ischemia in the closed-loop small bowel obstruction (CL-SBO) group.

RESULTS

A total of 219 patients (95 in the CL-SBO group and 124 in the open-loop small bowel obstruction [OL-SBO] group) were included in our research. D-dimers (median 1085 vs. 690, P = 0.019), tenderness (77.9% vs. 59.7%, P = 0.004), more than one beak sign (65.3% vs. 30.6%, P < 0.001), radial distribution (18.9% vs. 6.5%, P = 0.005), whirl sign (35.8% vs. 8.9%, P < 0.001), and ascites (71.6% vs. 53.2%, P = 0.006) were selected as the predictive variables of the nomogram. This model's Harrell's C statistic was 0.786 (95% confidence interval (CI), 0.724-0.848), and the Brier score was 0.182. The Harrell's C statistic of external validation was 0.784 (95%CI, 0.664-0.905); the Brier score was 0.190. Regarding the CT findings, radial distribution, U/C-shaped loop, and whirl sign had high specificity (93.5%, 96.0%, and 91.1%, respectively), but low sensitivity (18.9%, 8.4%, and 35.8%, respectively). D-dimer levels and tenderness were also associated with bowel ischemia.

CONCLUSION

The nomogram accurately predicted CL-SBO in patients with SBO, and surgery should be considered when patients have a high risk for developing CL-SBO.

The Therapeutic Potential of Targeting Key Signaling Pathways as a Novel Approach to Ameliorating Post-Surgical Adhesions

BACKGROUND

Peritoneal adhesions (PA) are a common complication of abdominal operations. A growing body of evidence shows that inhibition of inflammation and fibrosis at sites of peritoneal damaging could prevent the development of intra-abdominal adhesions.

METHODS

A search of PubMed, Medline, CINAHL and Embase databases was performed using the keywords 'postsurgical adhesion', 'post-operative adhesion', 'peritoneal adhesion', 'surgery-induced adhesion' and 'abdominal adhesion'. Studies detailing the use of pharmacological and non-pharmacological agents for peritoneal adhesion prevention were identified, and their bibliographies were thoroughly reviewed to identify further related articles.

RESULTS

Several signaling pathways, such as tumor necrosis factor-alpha, tissue plasminogen activator, and type 1 plasminogen activator inhibitor, macrophages, fibroblasts, and mesothelial cells play a key part in the development of plasminogen activator. Several therapeutic approaches based on anti-PA drug barriers and traditional herbal medicines have been developed to prevent and treat adhesion formation. In recent years, the most promising method to prevent PA is treatment using biomaterial-based barriers.

CONCLUSION

In this review, we provide an overview of the pathophysiology of adhesion formation and various agents targeting different pathways, including chemical agents, herbal agents, physical barriers, and clinical trials concerning this matter.

Adhesions in abdomino-pelvic surgeries: A real economic impact?

STUDY OBJECTIVE

To evaluate the epidemiologic and economic burden related to adhesions and their complications for the French healthcare system.

DESIGN

A descriptive and economic retrospective analysis.

SETTING

Medicalized information system program (PMSI), national scale of costs.

PATIENTS

Female patients operated on to treat adhesions related complications in 2019.

INTERVENTIONS

All patients with coded adhesiolysis acts were selected in order to identify the characteristics of Diagnosis related groups (DRG) and compare them with the general DRGs. Then, a sub-analysis on surgery types (laparoscopy or open procedures) was performed to evaluate impact adhesions development and Length of Stay. Lastly, direct costs of adhesions for the healthcare system were quantified based upon adhesiolysis acts coded as main diagnosis.

MEASUREMENTS AND MAIN RESULTS

26.387 adhesiolysis procedures were listed in France in 2019 through 8 adhesiolysis acts regrouping open surgeries and laparoscopic procedures. Adhesiolysis was coded in up to 34% in some DRGs for laparoscopic procedures. 1551 (1461 studied in our study) surgeries have been realized in 2019 with main procedure: adhesiolysis. These surgeries were associated with an expense of €4 million for the healthcare system for rehospitalizations and reoperations only. Social costs such as sick leaves, drugs and other cares haven't been taken in consideration.

CONCLUSION

Adhesions related complications represent a massive burden for patients and an expensive problem for society. These difficulties may likely to be reduced by a broader use of antiadhesion barriers, at least in some targeted procedures.

In-situ growth of robust superlubricated nano-skin on electrospun nanofibers for post-operative adhesion prevention

It is a great challenge to achieve robustly bonded, fully covered, and nanoscaled coating on the surface of electrospun nanofibers. Herein, we develop a controllable, facile, and versatile strategy to in-situ grow superlubricated nano-skin (SLNS) on the single electrospun nanofiber. Specifically, zwitterionic polymer chains are generated from the nanofiber subsurface in an inside-out way, which consequently form a robust network interpenetrating with the polymeric chains of the nanofiber matrix. The nanofibers with SLNS are superlubricated with the coefficient of friction (COF) lower than 0.025, which is about 16-fold of reduction than the original nanofibers. The time-COF plot is very stable after 12, 000 cycles of friction test, and no abrasion is observed. Additionally, the developed nanofibrous membranes possess favorable tensile property and biocompatibility. Furthermore, the nanofibrous membranes with SLNS achieve prevention of post-operative adhesion, which is confirmed in both rat tendon adhesion model and abdominal adhesion model. Compared with clinically-used antiadhesive membranes such as Interceed and DK-film, our nanofibrous membranes are not only more effective but also have the advantage of lower production cost. Therefore, this study demonstrates a potential of the superlubricated nanofibrous membranes in-situ grown based on a SLNS strategy for achieving prevention of post-operative adhesion in clinics.

Point-of-care ultrasound-first for the evaluation of small bowel obstruction: National cost savings, length of stay reduction, and preventable radiation exposure

OBJECTIVES

Computed tomography (CT) has long been the gold standard in diagnosing patients with suspected small bowel obstruction (SBO). Recently, point-of-care ultrasound (POCUS) has demonstrated comparable test characteristics to CT imaging for the diagnosis of SBO. Our primary objective was to estimate the annual national cost saving impact of a POCUS-first approach for the evaluation of SBO. Our secondary objectives were to estimate the reduction in radiation exposure and emergency department (ED) length of stay (LOS).

METHODS

We created and ran 1000 trials of a Monte Carlo simulation. The study population included all patients presenting to the ED with abdominal pain who were diagnosed with SBO. Using this simulation, we modeled the national annual cost savings in averted advanced imaging from a POCUS-first approach for SBO. The model assumes that all patients who require surgery or have non-diagnostic POCUS exams undergo CT imaging. The model also conservatively assumes that a subset of patients with diagnostic POCUS exams undergo additional confirmatory CT imaging. We used the same Monte Carlo model to estimate the reduction in radiation exposure and total ED bed hours saved.

RESULTS

A POCUS-first approach for diagnosing SBO was estimated to save a mean (±SD) of $30.1 million (±8.9 million) by avoiding 143,000 (±31,000) CT scans. This resulted in a national cumulative decrease of 507,000 bed hours (±268,000) in ED LOS. The reduction in radiation exposure to patients could potentially prevent 195 (±56) excess annual cancer cases and 98 (±28) excess annual cancer deaths.

CONCLUSIONS

If adopted widely and used consistently, a POCUS-first algorithm for SBO could yield substantial national cost savings by averting advanced imaging, decreasing ED LOS, and reducing unnecessary radiation exposure in patients. Clinical decision tools are needed to better identify which patients would most benefit from CT imaging for SBO in the ED.

Evaluating suspected small bowel obstruction with the water-soluble contrast challenge

With optimized technique, the water-soluble contrast challenge is effective at triaging patients for operative vs non-operative management of suspected small bowel obstruction. Standardized study structure and interpretation guidelines aid in clinical efficacy and ease of use. Many tips and tricks exist regarding technique and interpretation, and their understanding may assist the interpreting radiologist. In the future, a CT-based water-soluble contrast challenge, utilizing oral contrast given as part of the initial CT examination, might allow for a more streamlined algorithm and provide more rapid results.

Intraperitoneal Triamcinolone Reduces Postoperative Adhesions, Possibly through Alteration of Mitochondrial Function

Adhesions frequently occur postoperatively, causing morbidity. In this noninterventional observational cohort study, we enrolled patients who presented for repeat abdominal surgery, after a history of previous abdominal myomectomy, from March 1998 to June 20210 at St. Vincent’s Catholic Medical Centers. The primary outcome of this pilot study was to compare adhesion rates, extent, and severity in patients who were treated with intraperitoneal triamcinolone acetonide during the initial abdominal myomectomy (n = 31) with those who did not receive any antiadhesion interventions (n = 21), as documented on retrospective chart review. Adhesions were blindly scored using a standard scoring system. About 32% of patients were found to have adhesions in the triamcinolone group compared to 71% in the untreated group (p < 0.01). Compared to controls, adhesions were significantly less in number (0.71 vs. 2.09, p < 0.005), severity (0.54 vs. 1.38, p < 0.004), and extent (0.45 vs. 1.28, p < 0.003). To understand the molecular mechanisms, human fibroblasts were incubated in hypoxic conditions and treated with triamcinolone or vehicle. In vitro studies showed that triamcinolone directly prevents the surge of reactive oxygen species triggered by 2% hypoxia and prevents the increase in TGF-β1 that leads to the irreversible conversion of fibroblasts to an adhesion phenotype. Triamcinolone prevents the increase in reactive oxygen species through alterations in mitochondrial function that are HIF-1α-independent. Controlling mitochondrial function may thus allow for adhesion-free surgery and reduced postoperative complications.

Diatrizoate (Gastrograffin®) Small Bowel Follow Through for Small Bowel Obstructions: Timing and Outcomes

INTRODUCTION

The advent of the Gastrograffin® small bowel follow through (G-SBFT) has resulted in a decreased rate of operative intervention of small bowel obstructions (SBO); however, there is no data to suggest when G-SBFT should be performed.

METHODS

We retrospectively reviewed 548 patients, admitted to 1 of 9 hospitals with a diagnosis of SBO. Patients were divided into two categories with regards to timing of G-SBFT: before (early) or after (late) 48 hours from admission. Primary outcomes were length of stay (LOS) and total cost. Secondary outcomes were operative interventions and mortality.

RESULTS

Of the reviewed patients, 71% had the G-SBFT ordered early. Comparing early versus late, there were no differences in patient characteristics with regards to age, sex, or BMI. There was a significant difference between LOS (4 vs 8 days, P < 0.05) and total cost ($17,056.19 vs $33,292.00, P < 0.05). There was no difference in mortality (1.3% vs 2.6%, P = 0.239) or 30-day readmission rates (15.6% vs 15.9%, P = 0.509). Patients in the early group underwent fewer operations (20.7% vs 31.9%, P = 0.05).

DISCUSSION

Patients that had a G-SBFT ordered early had a decreased LOS, total cost, and operative intervention. This suggests there is a benefit to ordering G-SBFT earlier in the hospital stay to reduce the overall disease burden, and that it is safe to do so with regards to mortality and readmissions. We therefore recommend ordering a G-SBFT within 48 hours to reduce LOS, cost, and need for an operation.

Evaluation of the Therapeutic Effects of the Hydroethanolic Extract of Portulaca oleracea on Surgical-Induced Peritoneal Adhesion

Objective

Peritoneal adhesion (PA) is an abnormal connective tissue that usually occurs between tissues adjacent to damaged organs during processes such as surgery. In this study, the anti-inflammatory and antioxidant effects of Portulaca oleracea (PO) were investigated against postoperative-induced peritoneal adhesion.

Methods

Thirty healthy male Wistar rats (220 ± 20 g, 6-8 weeks) were randomly divided into four groups: (1) normal, (2) control (induced peritoneal adhesion), and (3) and (4) PO extracts (induced peritoneal adhesion and received 100 or 300 mg/kg/day of PO extract for seven days). Finally, macroscopic and microscopic examinations were performed using different scoring systems and immunoassays in the peritoneal lavage fluid.

Results

We found that the levels of adhesion scores and interleukin- (IL-) 1β, IL-6, IL-10, tumour necrosis factor- (TNF-) α, transforming growth factor- (TGF-) β ₁, vascular endothelial growth factor (VEGF), and malondialdehyde (MDA) were increased in the control group. However, PO extract (100 and 300 mg/kg) notably reduced inflammatory (IL-1β, IL-6, and TNF-α), fibrosis (TGF-β ₁), angiogenesis (VEGF), and oxidative (MDA) factors, while increased anti-inflammatory cytokine IL-10, antioxidant factor glutathione (GSH), compared to the control group.

Conclusion

Oral administration of PO improved postoperational-induced PA by alleviating the oxidative factors, fibrosis, inflammatory cytokines, angiogenesis biomarkers, and stimulating antioxidative factors. Hence, PO can be considered a potential herbal medicine to manage postoperative PA. However, further clinical studies are required to approve the effectiveness of PO.

Post-Operative Adhesions: A Comprehensive Review of Mechanisms

Post-surgical adhesions are common in almost all surgical areas and are associated with significant rates of morbidity, mortality, and increased healthcare costs, especially when a patient requires repeat operative interventions. Many groups have studied the mechanisms driving post-surgical adhesion formation. Despite continued advancements, we are yet to identify a prevailing mechanism. It is highly likely that post-operative adhesions have a multifactorial etiology. This complex pathophysiology, coupled with our incomplete understanding of the underlying pathways, has resulted in therapeutic options that have failed to demonstrate safety and efficacy on a consistent basis. The translation of findings from basic and preclinical research into robust clinical trials has also remained elusive. Herein, we present and contextualize the latest findings surrounding mechanisms that have been implicated in post-surgical adhesion formation.

Prevention of Post-Operative Adhesions: A Comprehensive Review of Present and Emerging Strategies

Post-operative adhesions affect patients undergoing all types of surgeries. They are associated with serious complications, including higher risk of morbidity and mortality. Given increased hospitalization, longer operative times, and longer length of hospital stay, post-surgical adhesions also pose a great financial burden. Although our knowledge of some of the underlying mechanisms driving adhesion formation has significantly improved over the past two decades, literature has yet to fully explain the pathogenesis and etiology of post-surgical adhesions. As a result, finding an ideal preventative strategy and leveraging appropriate tissue engineering strategies has proven to be difficult. Different products have been developed and enjoyed various levels of success along the translational tissue engineering research spectrum, but their clinical translation has been limited. Herein, we comprehensively review the agents and products that have been developed to mitigate post-operative adhesion formation. We also assess emerging strategies that aid in facilitating precision and personalized medicine to improve outcomes for patients and our healthcare system.

Water-Soluble Contrast Challenge for Suspected Small Bowel Obstruction: Technical Success Rate, Accuracy, and Clinical Outcomes

Among 109 iohexol-based water-soluble contrast challenges performed for suspected small bowel obstruction, 105 were technically adequate. Among technically-adequate studies, colonic contrast (i.e., successful challenge) was seen in 66 on 8-hour, and 86 on 24-hour, radiograph. Fourteen patients underwent operative magnement; 91 underwent non-operative management (NOM). Successful challenge had sensitivity 91.2%, specificity 78.5%, PPV 96.5%, NPV 57.8%, and odds ratio 38.0 (95% CI, 8.7-165.2) for NOM. Three of 86 patients with successful challenge underwent operative management.

Peritoneal Adhesions and their Prevention - Current Trends

The development of adhesions after gynecologic surgery is a severe problem with ramifications that go beyond the medical complications patients suffer (which most often include pain, obstruction and infertility), since they also impose a huge financial burden on the health care system and increase the workload of surgeons and all personnel involved in surgical follow-up care. Surgical techniques to avoid adhesion formation have not proven to be sufficient and pharmaceutical approaches for their prevention are even less effective, which means that the use of adhesion prevention devices is essential for achieving decent prophylaxis. This review explores the wide range of adhesion prevention products currently available on the market. Particular emphasis is put on prospective randomized controlled clinical trials that include second-look interventions, as these offer the most solid evidence of efficacy. We focused on adhesion scores, which are the most common way to quantify adhesion formation. This enables a direct comparison of the efficacies of different devices. While the greatest amount of data are available for oxidized regenerated cellulose, the outcomes with this adhesion barrier are mediocre and several studies have shown little efficacy. The best results have been achieved using adhesion barriers based on either modified starch, i.e., 4DryField® PH (PlantTec Medical GmbH, Lüneburg, Germany), or expanded polytetrafluoroethylene, i.e., GoreTex (W.L. Gore & Associates, Inc., Medical Products Division, Flagstaff, AZ), albeit the latter, as a non-resorbable barrier, has a huge disadvantage of having to be surgically removed again. Therefore, 4DryField® PH currently appears to be a promising approach and further studies are recommended.

Composite Score for Outcome Prediction in Gynecologic Surgery Patients

BACKGROUND

The LACE+ index is a well-studied metric that compacts patient data in an effort to assess readmission risk.

PURPOSE

Assess the capacity of LACE+ scores for predicting short-term undesirable outcomes in an entire single-center population of patients undergoing gynecologic surgery.

IMPORTANCE AND RELEVANCE TO HEALTHCARE QUALITY

Proactive identification of high-risk patients, with tools such as the LACE+ index, may serve as the first step toward appropriately engaging resources for reducing readmissions.

METHODS

This study was a retrospective analysis that used coarsened exact matching. All gynecologic surgery cases over 2 years within a single health system (n = 12,225) were included for analysis. Outcomes of interest were unplanned readmission, emergency room (ER) evaluation, and return to surgery. Composite LACE+ scores were separated into quartiles and matched. For outcome comparison, matched patients were assessed by LACE+ quartile, using Q4 as the reference group.

RESULTS

Increasing LACE+ score reflected a higher rate of readmission (p = .003, p = .001) and visits to the ER at 30 postoperative days (p < .001).

CONCLUSION

The data presented here suggest that LACE+ index is a viable metric for patient outcome prediction following gynecologic surgery.

Limited efficacy with additional adverse effect of anti-adhesion barrier at primary cesarean section

BACKGROUND/PURPOSE

In our experience, adhesion after the primary CS is generally minimal or nonexistent. However, adhesion barriers users have experienced more febrile episodes that may require therapeutic antibiotics during the postcesarean period. We evaluated clinical efficacy of HA-CMC and ORC to prevent adhesion at secondary CS and the post-operative outcome at primary and secondary CS.

METHODS

This retrospective study includes 199 Asian women undergoing primary and secondary cesarean section between January1, 2011, and September 31, 2019. We used linear and logistic regression to analyze risk factors of postcesarean fever. An interaction term analysis was performed to examine the effect of surgical site infection risk factors and use of adhesion barrier on postcesarean fever rates.

RESULTS

We found that use of adhesion barrier at the primary cesarean section is associated with a significantly higher incidence of postcesarean fever (p = 0.045), which is an independent risk factor of postcesarean fever (adjusted hazard ratio (Adj-HR)= 3.53, 95% CI = 1.03-10.24, p = 0.045). The strongest risk factor for postcesarean fever is the use of anti-adhesion film during emergency cesarean section (p = 0.041). In the subgroup of labor before operation and emergency cesarean section, adhesion barrier user had significant higher risk of postcesarean fever than nonuser (p = 0.018, Adj-HR = 12.12, 95% CI = 1.53-95.78; emergency cesarean section: p = 0.016, Adj-HR = 12.71, 95% CI = 1.62-99.62).

CONCLUSION

Use of anti-adhesion films during emergency cases and with a significantly higher risk of postcesarean fever which potentially means increased risk of surgical site infection. Therefore, we do not suggest routine application of anti-adhesion films during cesarean deliveries especially in emergency cesarean section or in a woman having labor before operation.

Non-operative Management of Small Bowel Obstruction in Patients with No Previous Abdominal Surgery: A Systematic Review and Meta-analysis

While the contemporary management of adhesive small bowel obstruction (SBO) often includes a trial of non-operative management (NOM), surgical dogma dictates urgent operative exploration in patients without previous abdominal surgery. This dogma has been challenged by recent evidence suggesting most obstructions in this population are adhesive in nature. The objectives of this review were to evaluate the feasibility of NOM in patients with SBO and no history of previous abdominal surgery, to examine the etiologies of SBO in this population, and to explore the rate of adverse events seen following NOM. Embase, Medline, Cochrane, and Google Scholar were searched from inception to September 24, 2019. Articles reporting on NOM for SBO in patients without previous abdominal surgery and without clinical or radiographic features necessitating an emergent operation were included. Data were combined to obtain a pooled proportion of patients discharged without operation following a trial of NOM. 6 studies reporting on a total of 272 patients were included. The pooled proportion of patients discharged following NOM was 49.5% (95% CI 23.7-75.3%). Adhesions were found to be the predominant cause of obstruction. NOM did not appear to increase short-term complications. Most SBOs in patients without previous abdominal surgery are adhesive in nature and many patients can be discharged from hospital without surgery. While the short-term outcomes of NOM are acceptable, future studies are needed to address the long-term outcomes and safety of NOM as a treatment strategy for SBO in patients without previous abdominal surgery.

Skin Color May Predict Intra-Abdominal Adhesions During Repeated Caesarean Section Deliveries

OBJECTIVE

Caesarean rates have increased rapidly for various reasons recently. One of the important reasons among these is medicolegal problems. Our aim with this study was to preoperatively predict abdominal adhesion density by combining the scar tissue morphology formed in the post-caesarean Pfannenstiel incision line and the skin color scoring of the patients.

MATERIAL AND METHODS

Patients who had undergone one caesarean section previously, completed their terms (37-39 weeks) and were under 35 years old were included in the study. Skin color scoring of the patients was performed using the Fitzpatrick skin color scale. Intra-abdominal adhesion scoring of the participant patients was performed using Nair's adhesion scoring system.

RESULTS

The change in abdominal adhesion scores was evaluated based on the Fitzpatrick color scale. Adhesion scores per the Nair intra-abdominal adhesion scoring system were found to be 0.04±0.209 in the FP1 group, 0.35±0.662 in the FP2 group, 1.58±0.923 in the FP3 group, and 2.33±0.577 in the FP4 group (p<0.05). These results showed a significant increase in adhesion density with increasing skin color darkness. Based on these results, it was observed that the abdominal adhesion scores and the frequency of depressed skin scar were significantly increased with increasing Fitzpatrick scores (p<0.05).

CONCLUSION

The aim of this study was to increase the prediction rates by adding the skin color scoring to the scar tissue characteristics, which have been used in previous studies. The results of this study indicate that the combination of these two parameters may be more effective in predicting intra-abdominal adhesions. Nevertheless, there is a need for studies with a much higher number of patients and multiple parameters to be able to predict intra-abdominal adhesion density preoperatively with greater accuracy.

Re-examining "Never Letting the Sun Rise or Set on a Bowel Obstruction" in the Era of Acute Care Surgery

BACKGROUND

Small bowel obstruction (SBO) no longer mandates urgent surgical evaluation raising the question of the role of operating room (OR) access on SBO outcomes.

METHODS

Data from our 2015 survey on emergency general surgery (EGS) practices, including queries on OR availability and surgical staffing, were anonymously linked to adult SBO patient data from 17 Statewide Inpatient Databases (SIDs). Univariate and multivariable associations between OR access and timing of operation, complications, length of stay (LOS), and in-hospital mortality were measured.

RESULTS

Of 32,422 SBO patients, 83% were treated non-operatively. Operative patients were older (median 66 vs 65 years), had more comorbidities (53% vs 46% with ≥ 3), and experienced more systemic complications (36% vs 23%), higher mortality (2.8% vs 1.4%), and longer LOS (median 10 vs 4 days). Patients had lower odds of operation if treated at hospitals lacking processes to tier urgent cases (aOR 0.90, 95% CI [0.83-0.99]) and defer elective cases (aOR 0.87 [0.80-0.94]). Patients had higher odds of operation if treated at hospitals with surgeons sometimes (aOR 1.14 [1.04-1.26]) or rarely/never (aOR 1.16 [1.06-1.26]) covering EGS at more than one location compared to always. Odds of systemic complication (OR 2.0 [1.6-2.4]), operative complication (OR 1.5 [1.2-1.8]), and mortality were increased for very late versus early operation (OR 2.6 [1.7-4.0]).

CONCLUSIONS

Although few patients with SBO require emergency surgery, we identified EGS structures and processes that are important for providing timely and appropriate intervention for patients whose SBO remains unresolved and requires surgery.

Prevention of adhesions post-abdominal surgery: Assessing the safety and efficacy of Chitogel with Deferiprone in a rat model

Introduction

Adhesions are often considered to be an inevitable consequence of abdominal and pelvic surgery, jeopardizing the medium and long-term success of these procedures. Numerous strategies have been tested to reduce adhesion formation, however, to date, no surgical or medical therapeutic approaches have been successful in its prevention. This study demonstrates the safety and efficacy of Chitogel with Deferiprone and/or antibacterial Gallium Protoporphyrin in different concentrations in preventing adhesion formation after abdominal surgery.

Materials and methods

112 adult (8–10 week old) male Wistar albino rats were subjected to midline laparotomy and caecal abrasion, with 48 rats having an additional enterotomy and suturing. Kaolin (0.005g/ml) was applied to further accelerate adhesion formation. The abrasion model rats were randomized to receive saline, Chitogel, or Chitogel plus Deferiprone (5, 10 or 20 mM), together with Gallium Protoporphyrin (250μg/mL). The abrasion with enterotomy rats were randomised to receive saline, Chitogel or Chitogel with Deferiprone (1 or 5 mM). At day 21, rats were euthanised, and adhesions graded macroscopically and microscopically; the tensile strength of the repaired caecum was determined by an investigator blinded to the treatment groups.

Results

Chitogel with Deferiprone 5 mM significantly reduced adhesion formation (p<0.01) when pathologically assessed in a rat abrasion model. Chitogel with Deferiprone 5 mM and 1 mM also significantly reduced adhesions (p<0.05) after abrasion with enterotomy. Def-Chitogel 1mM treatment did not weaken the enterotomy site with treated sites having significantly better tensile strength compared to control saline treated enterotomy rats.

Conclusions

Chitogel with Deferiprone 1 mM constitutes an effective preventative anti-adhesion barrier after abdominal surgery in a rat model. Moreover, this therapeutic combination of agents is safe and does not weaken the healing of the sutured enterotomy site.

Spectrum of CT Findings Related to Bowel Adhesions Without Bowel Obstruction: A Comprehensive Imaging Review

Post-operative adhesions can occur following abdominal or pelvic surgery and are a significant cause of morbidity and mortality. Adhesions are an important cause of abdominal complaints, especially chronic abdominal pain, infertility, and bowel obstruction; responsible for an estimated $2.3 billion annual burden in the United States alone. There is a paucity of literature describing CT findings indicative of the presence of adhesions, however, findings suggestive of this entity may be discovered by a discerning eye. Early recognition and diagnosis may be beneficial for reducing consumption of health-care resources related to abdominal complaints. In addition, these findings may impact surgical planning and facilitate recognition of adhesion-related complications, said to be responsible for a significant number of malpractice claims. The following review discusses various CT findings which may indicate the presence of adhesions. These findings may initially be overlooked, but remain valuable as the clinical presentation evolves to become consistent with adhesive disease. Detection of bowel and peritoneal adhesions can be recognized on imaging modalities based on distortion of bowel loops. This pictorial review illustrates the spectrum of findings related to bowel adhesions encountered on computed tomography imaging.

PREVALENCE, DISTRIBUTION AND DETERMINANTS OF INTESTINAL TUBERCULOSIS IN ADULT INDOOR PATIENTS WITH ACUTE SMALL INTESTINAL OBSTRUCTION IN POPULATION OF PESHAWAR DIVISION, PAKISTAN

Background: Acute small intestinal obstruction (ASIO) is one of the commonest causes of emergency hospital admissions, morbidity and mortality. Intestinal tuberculosis (ITB) is common cause of ASIO in developing countries leading to significant morbidity and mortality. Our objectives were to determine prevalence, distribution and determinants of ITB in adult indoor patients with ASIO in population of Peshawar Division, Pakistan.Materials Methods: This cross-sectional study was conducted at Department of Surgery Peshawar Medical College, Peshawar, Pakistan from January 2019 to June 2020.  The data was collected from its three affiliated hospitals; Mercy Teaching Hospital, Kuwait Teaching Hospital Prime Teaching Hospital, Peshawar. 207 ASIO subjects were selected from population at risk consecutively. Sex, age groups and presence of ITB were variables. Prevalence and distribution were described by count, percentage and confidence intervals for proportion for population. Hypotheses for distribution were tested by chi-square goodness of fit and of association by chi-square test of association.Results: Out of 207 patients with ASIO, 128 (61.84%) were men and 79 (38.16%) women, 87 (42.03%) were in age group 18-40 and 120 (57.97%) in 41-60 years. Out of 207 patients with ASIO, 41 (19.81%) had ITB, while 166 (80.19%) had no ITB. Out of 41 ITB patients, 25 (12.08%) were men and 16 (7.73%) women, 17 (8.21%) in age group 18-40 and 24 (11.60%) in 41-60 years. The prevalence of ITB was similar to expected (p=.5695). The distribution across sex (p=.00001) was different and across age groups (p=.12501) was similar to expected. Presence of ITB was not associated to sex (p=.8992) and age groups (p=.9347).Conclusion: Prevalence of intestinal TB in adult indoor acute small intestinal obstruction (ASIO) population of Peshawar Division, Pakistan was 19.81%. Prevalence was higher in men than women and higher in 41-60 years than 18-40 years age group population. Overall prevalence of intestinal TB was similar to expected. Observed distribution across sex was different and across age groups was similar to expected. Presence of intestinal TB was not associated to sex and age groups respectively.

Neutrophil and monocyte kinetics play critical roles in mouse peritoneal adhesion formation

Peritoneal adhesions are pathological fibroses that ensnare organs after abdominal surgery. This dense connective tissue can cause small bowel obstruction, female infertility, and chronic abdominal pain. The pathogenesis of adhesions is a fibrotic response to tissue damage coordinated between mesothelial cells, fibroblasts, and immune cells. We have previously demonstrated that peritoneal adhesions are a consequence of mechanical injury to the mesothelial layer sustained during surgery. Neutrophils are among the first leukocytes involved in the early response to tissue damage. Here, we show that when subjected to mechanical stress, activated mesothelial cells directly recruit neutrophils and monocytes through upregulation of chemokines such as CXCL1 and monocyte chemoattractant protein 1 (MCP-1). We find that neutrophils within the adhesion sites undergo cell death and form neutrophil extracellular traps (NETosis) that contribute to pathogenesis. Conversely, tissue-resident macrophages were profoundly depleted throughout the disease time course. We show that this is distinct from traditional inflammatory kinetics such as after sham surgery or chemically induced peritonitis, and suggest that adhesions result from a primary difference in inflammatory kinetics. We find that transient depletion of circulating neutrophils significantly decreases adhesion burden, and further recruitment of monocytes with thioglycolate or MCP-1 also improves outcomes. Our findings suggest that the combination of neutrophil depletion and monocyte recruitment is sufficient to prevent adhesion formation, thus providing insight for potential clinical interventions.

Acute small bowel obstruction: one-year retrospective study of admissions to inner city Royal Perth Hospital

BACKGROUND

Analyse admissions to Royal Perth Hospital (RPH) with acute small bowel obstruction (SBO), and identify trends between outcomes and management.

METHODS

Retrospective, single-centre review of patients admitted to RPH with acute SBO, between May 2017 and May 2018.

RESULTS

A total of 251 admissions met inclusion criteria. Increasing age correlated with increasing total length of stay (LOS) (r = 0.134, P = 0.033) and post-operative LOS (r = 0.349, P < 0.0001). Increasing age led to poorer outcomes (P < 0.0001). Diagnoses were most commonly adhesions (167/251 = 66.5%), hernias (47/251 = 18.7%) and inflammatory bowel diseases (11/251 = 4.4%). Operation rate for adhesional SBO was 24.6% (41/167) and non-adhesional SBO 54.8% (46/84). Median total LOS for operative versus conservative management was 9 days (interquartile range (IQR) 8) versus 3 days (IQR 3) (P < 0.0001). Median time to surgery was 1 day (IQR 2). Increased time from admission to theatre led to increasing post-operative LOS (r = 0.398, P = 0.0013). Median post-operative LOS for bowel resection versus no resection was 9 days (IQR 4.5) versus 6 days (IQR 4) (P = 0.0128). Of 101, 81 (80.2%) adhesional SBO resolved non-operatively after receiving Gastrografin, compared to 45 of 66 (68.2%) of those who did not (P = 0.07). It did not significantly alter total or post-operative LOS (P = 0.65 and P = 0.96), patient outcome (P = 0.26), or need for bowel resection (P = 0.63).

CONCLUSIONS

Operative management, bowel resection, older age and increasing time from admission to surgery increase LOS. Trial of Gastrografin in non-operative management of adhesion type small bowel obstructions does not significantly affect outcomes but tends to reduce operative rates.

Small Bowel Obstruction: the Sun Also Rises?

Small bowel obstruction (SBO) remains a common reason for emergency/unplanned admissions, and remains a significant burden to SBO patients and the healthcare system alike. The management of SBO has undergone a significant paradigm shift over the years, shifting far from the tenet to "never let the sun rise on a bowel obstruction." Not only has the timing to surgery changed, but there is also an increased utilization of diagnostic tools to aid clinical decision-making. Furthermore, the surgical management is beginning to favor a less invasive approach. This review will serve to provide an up-to-date review of the evaluation and management of SBO, based on the most recent available evidence and our experience with the methods described.

Disease Severity and Cost in Adhesive Small Bowel Obstruction

BACKGROUND

Adhesive small bowel obstruction (ASBO) severity has been associated with important clinical outcomes. However, the impact of ASBO severity on hospitalization cost is unknown. The American Association for the Surgery of Trauma (AAST) developed an Emergency General Surgery (EGS) disease severity grading system for ASBO. We stratified patients' ASBO severity and captured hospitalization costs hypothesizing that increased disease severity would correlate with greater costs.

METHODS

This was a single-center study of hospitalized adult patients with SBO during 2015-2017. Clinical data and estimated total cost (direct + indirect) were abstracted. AAST EGS grades (I-IV) stratified disease severity. Costs were normalized to the median grade I cost. Univariate and multivariate analyses evaluated the relationship between normalized cost and AAST EGS grade, length of hospital and ICU stay, operative time, and Charlson comorbidity index.

RESULTS

There were 214 patients; 119 (56%) were female. AAST EGS grades included: I (62%, n = 132), II (23%, n = 49), III (7%, n = 16), and IV (8%, n = 17). Relative to grade I, median normalized cost increased by 1.4-fold for grade II, 1.6-fold for grade III, and 4.3-fold for grade IV disease. No considerable differences in patient comorbidity between grades were observed. Pair-wise comparisons demonstrated that grade I disease cost less than higher grades (corrected p < 0.001). Non-operative management was associated with lower normalized cost compared to operative management (1.1 vs. 4.5, p < 0.0001). In patients who failed non-operative management, normalized cost was increased 7.2-fold. Collectively, the AAST EGS grade correlated well with cost (Spearman's p = 0.7, p < 0.0001). After adjustment for covariates, AAST EGS grade maintained a persistent relationship with cost.

CONCLUSION

Increasing ASBO severity is independently associated with greater costs. Efforts to identify and mitigate costs associated with this burdensome disease are warranted.

LEVEL OF EVIDENCE

III, economic/decision.

Peritoneal adhesions do not increase intra-operative organ injury or adverse neonatal outcomes during a repeated cesarean delivery

PURPOSE

To examine whether the presence of peritoneal adhesions at the second cesarean delivery (CD), attributable to the first CD, are associated with maternal intra-operative organ injury and adverse neonatal outcomes.

METHODS

A retrospective cohort study was conducted, comparing severe maternal intra-operative organ injury and adverse neonatal outcomes, between women with and without peritoneal adhesions. All women with two CDs during the follow-up period were included. Women with adhesions diagnosed during the first CD, history of other abdominal or pelvic surgery, pelvic infection or pelvic inflammatory disease, endometriosis, uterine Mullerian anomalies and newborns with known chromosomal or structural abnormalities were excluded, resulting in 7925 women. Intra-operative peritoneal organ injury was defined as a composite of bladder injury, ureteral injury, small bowel injury or hysterectomy. The examined adverse neonatal outcomes were low 1 and 5 min Apgar scores, intrapartum death (IPD) and postpartum death (PPD). Multivariate logistic regression was performed.

RESULTS

Peritoneal adhesions at the second CD, attributable to the first CD were diagnosed in 32.6% of patients (n = 2581). The presence of peritoneal adhesions was not found to be independently associated with intra-operative organ injury nor with 5 min Apgar scores, IPD and PPD. Second CDs complicated with adhesions were found to be associated with low (< 7) 1 min Apgar scores (adjusted OR 1.38, CI 1.20-1.58, p < 0.001).

CONCLUSION

Adhesions attributable to a previous CD do not seem to increase the risk for intra-operative organ injury and adverse neonatal outcomes. These findings may assist in reassuring patients who are facing a second CD.

Early operative management in patients with adhesive small bowel obstruction: population-based cost analysis

Background

Adhesive small bowel obstruction (aSBO) is a potentially recurrent disease. Although non‐operative management is often successful, it is associated with greater risk of recurrence than operative intervention, and may have greater downstream morbidity and costs. This study aimed to compare the current standard of care, trial of non‐operative management (TNOM), and early operative management (EOM) for aSBO.

Methods

Patients admitted to hospital between 2005 and 2014 in Ontario, Canada, with their first episode of aSBO were identified and propensity‐matched on their likelihood to receive EOM for a cost–utility analysis using population‐based administrative data. Patients were followed for 5 years to determine survival, recurrences, adverse events and inpatient costs to the healthcare system. Utility scores were attributed to aSBO‐related events. Cost–utility was presented as the incremental cost‐effectiveness ratio (ICER), expressed as Canadian dollars per quality‐adjusted life‐year (QALY).

Results

Some 25 150 patients were admitted for aSBO and 3174 (12·6 per cent) were managed by EOM. Patients managed by TNOM were more likely to experience recurrence of aSBO (20·9 per cent versus 13·2 per cent for EOM; P < 0·001). The lower recurrence rate associated with EOM contributed to an overall net effectiveness in terms of QALYs. The mean accumulated costs for patients managed with EOM exceeded those of TNOM ($17 951 versus $11 594 (€12 288 versus €7936) respectively; P < 0·001), but the ICER for EOM versus TNOM was $29 881 (€20 454) per QALY, suggesting cost‐effectiveness.

Conclusion

This retrospective study, based on administrative data, documented that EOM may be a cost‐effective approach for patients with aSBO in terms of QALYs. Future guidelines on the management of aSBO may also consider the long‐term outcomes and costs.

Post-surgical adhesions are triggered by calcium-dependent membrane bridges between mesothelial surfaces

Surgical adhesions are bands of scar tissues that abnormally conjoin organ surfaces. Adhesions are a major cause of post-operative and dialysis-related complications, yet their patho-mechanism remains elusive, and prevention agents in clinical trials have thus far failed to achieve efficacy. Here, we uncover the adhesion initiation mechanism by coating beads with human mesothelial cells that normally line organ surfaces, and viewing them under adhesion stimuli. We document expansive membrane protrusions from mesothelia that tether beads with massive accompanying adherence forces. Membrane protrusions precede matrix deposition, and can transmit adhesion stimuli to healthy surfaces. We identify cytoskeletal effectors and calcium signaling as molecular triggers that initiate surgical adhesions. A single, localized dose targeting these early germinal events completely prevented adhesions in a preclinical mouse model, and in human assays. Our findings classifies the adhesion pathology as originating from mesothelial membrane bridges and offer a radically new therapeutic approach to treat adhesions.

Surgical adhesions are organ-joining bands of scar tissue that remain clinically untreatable. Here, the authors show that adhesions are formed through expansive mesothelial membrane bridges, and that blocking these with small molecules prevents formation of adhesions in mice.

Accuracy of Computed Tomography in Small Bowel Obstruction

Small bowel obstruction is a common clinical occurrence, primarily caused by adhesions. The diagnosis is usually made on the clinical findings and the presence of dilated bowel loops on plain abdominal radiograph. Computed tomography (CT) is increasingly used to diagnose the cause and location of the obstruction to aid in the timing of surgical intervention. We used a retrospective chart review to identify patients with a diagnosis of small bowel obstruction between 2009 and 2012. We compared the findings on CT with the findings at operative intervention. Sixty patients had abdominal CT and subsequent surgical intervention. Eighty-three per cent of CTs were correct for small intestine involvement and 80 per cent for colon involvement. The presence of adhesions or perforation was correctly identified in 21 and 50 per cent, respectively. Sixty-four per cent correctly identified a transition point. The presence of a mass was correctly identified in 69 per cent. Twenty per cent of the patients who had ischemic small bowel at surgery were identified on CT. CT has a role in the clinical assessment of patients with small bowel obstruction, identifying with reasonable accuracy the extent of bowel involvement and the presence of masses and transition points. It is less reliable at identifying adhesions, perforations, or ischemic bowel.