The failed gastrointestinal anastomosis: an inevitable catastrophe?

Recanalization in Uncut Roux-en-Y Reconstruction: An Animal Experiment and a Clinical Study

Background: Because of the challenge of jejunal closure recanalization, uncut Roux-en-Y reconstruction remains controversial. This study aimed to investigate the incidence of recanalization after uncut Roux-en-Y reconstruction in pigs and a small number of patients.

Methods: Twenty miniature pigs were subjected to distal gastrectomy and uncut Roux-en-Y reconstruction using various rows of linear staplers to block the intestine. The pigs were sacrificed, and the incidence of recanalization was investigated 1 month after the operation. From December 2018 to June 2019, 10 patients with gastric cancer who had undergone elective laparoscopy-assisted distal gastrectomy and uncut Roux-en-Y reconstruction were included in this study. The primary study outcome was recanalization of the afferent limb, demonstrated by gastrointestinal radiography 1, 3, and 6 months after surgery. Various numbers of staple lines across the afferent jejunal limb were applied for closure: 2 staple lines in 2 pigs, 4 staple lines in 6 pigs, 6 staple lines in 8 pigs, and 8 staple lines in 4 pigs.

Results: Complete recanalization was detected in all 20 pigs 1 month postoperatively. Recanalization was detected in five cases (50%) by gastrointestinal radiography. Among them, 1 case of recanalization was found in the 1st month after the operation, 2 cases were found in the 3rd month, and another 2 cases were found in the 6th month. Bile reflux was detected by endoscopy in 2 patients with recanalization.

Conclusions: The occurrence of afferent limb recanalization after uncut Roux-en-Y reconstruction is high, and using additional staplers alone cannot decrease the incidence of recanalization. Based on our study, uncut Roux-en-Y reconstruction is not recommended.

Intraoperative surgeon probe inspection compared to leak testing for detecting gaps in canine jejunal continuous anastomoses: A cadaveric study

OBJECTIVE

To compare the detection of gaps in jejunal continuous anastomoses by probing (PT) versus leak testing (LT).

STUDY DESIGN

Experimental study.

ANIMALS

Normal jejunal segments (n = 24) from two fresh canine cadavers.

METHODS

Intestinal segments were randomly selected by four volunteers who created six simple continuous anastomoses: two constructs using standard technique with 2-3 mm suture spacing (ST, 8 total), and four constructs with one 4-mm gap (IG, 16 total). All 24 anastomoses were examined with PT (1 volunteer) prior to LT (3 volunteers). LT was performed within a maximal peristaltic pressure range (34-54 cmH₂ O). The presence and location of anastomotic leaks (L_A ) detected with LT were compared with gaps detected with PT.

RESULTS

Nineteen out of twenty-four (79.2%) samples had at least one probe drop, and four out of twenty-three (17.4%) samples leaked. LT results from one sample were excluded due to iatrogenic suture failure. PT was 100% sensitive (95% CI: 51.01, 100%) with a 100% negative predictive value (95% CI: 56.55, 100%) at detecting gaps compared with LT. The location of all L_A was accurately identified with PT and confirmed during LT.

CONCLUSION

PT was highly sensitive at detecting gaps compared with LT. All L_A were accurately detected by PT. None of the segments negative during PT leaked.

CLINICAL SIGNIFICANCE

The diagnostic value of PT appears adequate to recognize gaps in cadaveric small intestinal anastomoses. PT offers surgeons an alternative to detect suture gaps that may contribute to postoperative dehiscence of intestinal anastomoses.

Efficacy of endoscopic management for anastomotic leakage after gastrectomy in patients with gastric cancer

Background

Anastomotic leakage (AL) after gastrectomy in gastric cancer patients is associated with high mortality rates. Various endoscopic procedures are available to manage this postoperative complication. The aim of study was to evaluate the outcome of two endoscopic modalities, clippings and stents, for the treatment of AL.

Patients and methods

There were 4916 gastric cancer patients who underwent gastrectomy between December 2007 and January 2016 at the National Cancer Center, Korea. A total of 115 patients (2.3%) developed AL. Of these, 85 patients (1.7%) received endoscopic therapy for AL and were included in this retrospective study. The endpoints were the complete leakage closure rates and risk factors associated with failure of endoscopic therapy.

Results

Of the 85 patients, 62 received endoscopic clippings (with or without detachable snares), and 23 received a stent insertion. Overall, the complete leakage closure rate was 80%, and no significant difference was found between the clipping and stent groups (79.0% vs. 82.6%, respectively; P = 0.89). The complete leakage closure rate was significantly lower in the duodenal and jejunal stump sites (60%) than esophageal sites (86.1%) and gastric sites (94.1%; P = 0.026). The multivariate analysis showed that stump leakage sites (adjusted odds ratio [aOR], 4.51; P = 0.031) and the presence of intra-abdominal abscess (aOR, 4.92; P = -0.025) were associated with unsuccessful leakage closures.

Conclusions

Endoscopic therapy using clippings or stents is an effective method for the postoperative management of AL in gastric cancer patients. This therapy can be considered a primary treatment option due to its demonstrated efficacy, safety, and minimally invasive nature.

Enhanced Skin Incisional Wound Healing With Intracellular ATP Delivery via Macrophage Proliferation and Direct Collagen Production

This study sought to use a newly developed intracellular ATP delivery to enhance incisional wound healing to reduce surgical wound dehiscence and to explore possible mechanism for this effect. Thirty-five adult New Zealand white rabbits were used. Skin incisions were made on the back and closed. ATP-vesicles were mixed with a neutral cream for one side of the wounds while the neutral cream alone was used on the other side of the wounds. Laser speckle contrast imaging (LSCI), biomechanical, histological, and immunohistochemical analyses were performed 7 and 14 days after surgery, and macrophage culture was used to test the enhanced collagen production ability. Among them, 10 were used for wound perfusion study and 25 were used for wound biomechanical and histological/immunohistochemical studies. Wound tissue perfusion was reduced after surgery especially in early days. Wound tissue tensile strength, breaking stress, and elasticity were all much higher in the ATP-vesicle treated group than in the cream treated group at days 7 and 14. The healing was complemented by earlier macrophage accumulation, in situ proliferation, followed by direct collagen production. The results were further confirmed by human macrophage culture. It was concluded that intracellular ATP delivery enhanced healing strength of incisional wounds via multiple mechanisms.

The ratio of gastric tube length to thorax length: a vital factor affecting leak after esophageal cervical anastomosis

Background

Esophagogastric anastomotic leak (AL) is a severe complication following esophageal resection. This study aims to explore preliminarily whether the ratio of the gastric conduit length to the thorax length can be regarded as a potential prognostic variable for AL, and if so, a cut-off value can be found to divide the patients into distinct risk groups.

Methods

We retrospectively reviewed the clinical data of 273 patients who underwent esophagectomy. The gastric conduit length, the thorax length, and other covariates were collected. Logistic regression was first conducted to probe the rationality of the ratio as a risk indicator of AL. Then the dichotomizing analysis was applied to find the optimal cut-off value.

Results

The incidence of AL was 12.5% (34/273). The coefficient of the ratio in the logistic regression equation was –7.901 with P<0.001, which indicated that the larger the ratio, the smaller the risk of AL. Further smoothed scatter plots revealed that a potential step function of the ratio of AL incidence exists, of which the steep part ranges from 1.74 to 1.90. Results of the accurate cut-off value search through a minimum P value approach give the optimal dichotomization point of 1.79.

Conclusions

The ratio of the gastric conduit length to the thorax length can reflect the tension in the anastomosis. The research proposes that surgeons can control the length of the gastric conduit during reconstruction to reduce the tension in the anastomosis and thus lead to a decrease in the incidence of AL.

Efficacy of single layered intestinal anastomosis over double layered intestinal anastomosis-an open labelled, randomized controlled trial

AIMS & OBJECTIVES

The hand-sewn method of bowel anastomosis is the most common because of its affordability, familiarity and easy availability of materials. It can be done in single or double layers, with different surgeons preferring one technique over the other. Double layer intestinal anastomosis (DLIA) is time-consuming, challenging to perform, and carries possibly a higher risk of devascularisation, infection, and necrosis. Studies conducted so far do not show a significant difference between the two, but have concluded that more studies are required to determine this definitively. This study attempted to see whether the single layer intestinal anastomosis (SLIA) is non-inferior to DLIA in terms of incidence of anastomotic leak. It also compared mortality, morbidity, and length of hospitalization (LOH) between the two groups.

MATERIALS AND METHODS

This was a parallel arm, open labelled, non-inferiority randomized controlled trial conducted in the department of surgery in a tertiary care centre between October 2016 and March 2018. Patients who fulfilled the inclusion criteria were randomly allotted to two groups: Patients undergoing SLIA and patients undergoing DLIA. After the procedure, all patients were assessed for anastomotic leak, morbidity, mortality and LOH in the postoperative period. A 3-month follow-up period was observed for complications.

RESULTS

A total of 106 patients were randomised, 52 in SLIA and 54 in DLIA. Baseline demographic and clinicopathological characteristics between the two groups were comparable. The most common indication for intestinal anastomosis was ostomy closure in both groups. There was no significant difference between the two groups in terms of anastomotic leak, other complications, mortality and LOH.

CONCLUSION

SLIA was comparable to DLIA with respect to incidence of anastomotic leak, morbidity, mortality, and the length of hospitalization, and can be considered as a safe and feasible alternative, in elective and emergency settings.

Risk factors and outcomes associated with anastomotic leaks following esophagectomy: a systematic review and meta-analysis

Anastomotic leaks (AL) are a major complication after esophagectomy. This meta-analysis aimed to determine identify risks factors for AL (preoperative, intra-operative, and post-operative factors) and assess the consequences to outcome on patients who developed an AL. This systematic review was performed according to PRISMA guidelines, and eligible studies were identified through a search of PubMed, Scopus, and Cochrane CENTRAL databases up to 31 December 2018. A meta-analysis was conducted with the use of random-effects modeling and prospectively registered with the PROSPERO database (Registration CRD42018130732). This review identified 174 studies reporting outcomes of 74,226 patients undergoing esophagectomy. The overall pooled AL rates were 11%, ranging from 0 to 49% in individual studies. Majority of studies were from Asia (n = 79). In pooled analyses, 23 factors were associated with AL (17 preoperative and six intraoperative). AL were associated with adverse outcomes including pulmonary (OR: 4.54, CI95%: 2.99-6.89, P < 0.001) and cardiac complications (OR: 2.44, CI95%: 1.77-3.37, P < 0.001), prolonged hospital stay (mean difference: 15 days, CI95%: 10-21 days, P < 0.001), and in-hospital mortality (OR: 5.91, CI95%: 1.41-24.79, P = 0.015). AL are a major complication following esophagectomy accounting for major morbidity and mortality. This meta-analysis identified modifiable risk factors for AL, which can be a target for interventions to reduce AL rates. Furthermore, identification of both modifiable and non-modifiable risk factors will facilitate risk stratification and prediction of AL enabling better perioperative planning, patient counseling, and informed consent.

Technical and Clinical Considerations for Successful Management of Postoperative Bowel Perforation by Percutaneous Foley Catheter Placement

Purpose

The aim of this study was to analyze several technical and clinical factors associated with the successful management of postoperative leakage by percutaneous Foley catheter placement.

Materials and Methods

Thirty-two patients were included in this retrospective study. Postoperative gastrointestinal leakage was diagnosed by computed tomography (CT) and the patients underwent percutaneous Foley catheter placement into the leakage site through Jackson-Pratt tubes or imaging-guided methods. Clinical success was defined as successful Foley catheter removal without symptom recurrence within 1 week and the risk factors for clinical failure were analyzed.

Results

In all patients, percutaneous Foley catheter placement was successfully achieved without complications. Foley catheter was placed at a median of 10 days (range, 1–68) after the confirmation of leakage on CT. Clinical success was achieved in 26 of the 32 patients (81%). Systemic comorbidity (p < 0.001) and failed oral intake (p = 0.015) were the statistically significant risk factors for clinical failure.

Conclusion

Percutaneous Foley catheter placement can be considered an effective approach for the management of postoperative bowel leakage. The presence of systemic comorbidity and successful oral diet after Foley catheter placement are significant factors for successful clinical recovery.

Comparison of Oncologic Outcomes in Laparoscopic versus Open Surgery for Non-Metastatic Colorectal Cancer: Personal Experience in a Single Institution

The oncologic merits of the laparoscopic technique for colorectal cancer surgery remain debatable. Eligible patients with non-metastatic colorectal cancer who were scheduled for an elective resection by one surgeon in a medical institution were randomized to either laparoscopic or open surgery. During this period, a total of 188 patients received laparoscopic surgery and the other 163 patients received the open approach. The primary endpoint was cancer-free five-year survival after operative treatment, and the secondary endpoint was the tumor recurrence incidence. Besides, surgical complications were also compared. There was no statistically significant difference between open and laparoscopic groups regarding the average number of lymph nodes dissected, ileus, anastomosis leakage, overall mortality rate, cancer recurrence rate, or cancer-free five-year survival. Even though performing a laparoscopic approach used a significantly longer operation time, this technique was more effective for colorectal cancer treatment in terms of shorter hospital stay and less blood loss. Meanwhile, fewer patients receiving the laparoscopic approach developed postoperative urinary tract infection, wound infection, or pneumonia, which reached statistical significance. For non-metastatic colorectal cancer patients, laparoscopic surgery resulted in better short-term outcomes, whether in several surgical complications and intra-operative blood loss. Though there was no significant statistical difference in terms of cancer-free five-year survival and tumor recurrence, it is strongly recommended that patients undergo laparoscopic surgery if not contraindicated.

Longer Operative Time and Intraoperative Blood Transfusion are Associated with Postoperative Anastomotic Leak after Lower Gastrointestinal Surgery

Anastomotic leak after lower gastrointestinal surgery is a complication with potential for high morbidity, mortality, and increased costs. A single-institution retrospective chart review was performed on all patients who underwent lower gastrointestinal surgery between June 2009 and June 2013. Fifty-seven variables were included in our analysis and their association with postoperative anastomotic leak was examined. Nine hundred fifty-two patients underwent 983 lower gastrointestinal anastomoses with an overall leak rate in this series of 6 per cent. Type of intestinal anastomosis created (P < 0.00005), operative indication (P < 0.015), operation performed (P < 0.014), intraoperative blood transfusion (P < 0.017), and intraoperative surgical drain placement (P < 0.022) were all predictive of anastomotic leak. Anastomotic leak rate increased by 1.3 times for every additional hour in the operating room after three hours. Both increasing operation time and intraoperative blood transfusions were associated with an increased rate of anastomotic leak. When operative time extends beyond three hours or in those cases were blood transfusions are given, surgeons should consider taking steps to minimize the risks of a potential anastomotic leak.

Procalcitonin and C-reactive protein as early markers of postoperative intra-abdominal infection in patients operated on colorectal cancer

PURPOSE

The aim of this study was to evaluate the accuracy of serum procalcitonin (PCT) and C-reactive protein (CRP) for early diagnosis of postoperative intra-abdominal infections (PIAI) after elective surgery for colorectal cancer.

METHODS

Prospective observational study including patients operated on for colorectal cancer between January and December of 2015 was performed. Serum PCT and CRP levels were measured before surgery and daily until postoperative day 3.

RESULTS

One hundred twenty patients were included. Seven patients (5.8%) had PIAI. PCT levels were significantly higher in patients with PIAI on postoperative days 1 and 3, whereas CRP levels only were significantly more elevated on postoperative day 3. The ratio between CRP levels on postoperative day 3 and CRP levels on postoperative days 2 (CRP D3/CRP D2) and 1 (CRP D3/CRP D1) was significantly higher in patients with PIAI. PCT on postoperative day 3, for a cutoff of 0.45 ng/mL, had the best sensitivity (100%) with a specificity of 73.8%. The ratio CRP D3/CRP D1 yielded the higher specificity and positive predictive value (90.9 and 27.3%, respectively, for a cutoff of 1.8). The higher negative predictive value was obtained for PCT on postoperative days 1 and 3 (100%, with cutoff of 0.76 and 0.45 ng/mL, respectively) and for CRP on postoperative day 3 (100% with cutoff of 10 mg/dL).

CONCLUSION

PCT and CRP serum levels are associated with the appearance of PIAI after colorectal cancer surgery, although the positive predictive values were low for both PCT and CRP. However, the negative predictive values were high.

Influence of perioperative nonsteroidal anti-inflammatory drugs on complications after gastrointestinal surgery: A meta-analysis

BACKGROUND

Nonsteroidal anti-inflammatory drugs (NSAIDs) are a key part of multimodal perioperative analgesia. This study aimed to evaluate the influence of perioperative NSAIDs application on complications after gastrointestinal surgery by using meta-analysis.

METHODS

A systematic review of published literature was conducted by searching computerized databases including PubMed, CBM, Springer, Chinese Academic Journals, and China Info since the databases were published until June 2015. The articles and retrospective references regarding complications after gastrointestinal surgery were collected to compare postoperative complications associated with NSAIDs or other analgesics. After they were assessed by randomized controlled trials and extracted by the standard of the Jadad systematic review, the homogeneous studies were pooled using RevMan 5.3 software. The meta-analysis was performed on five postoperative complications: postoperative anastomotic leak, cardiovascular events, surgical site infection, nausea and vomiting, and intestinal obstruction.

RESULTS

Twelve randomized controlled trials involving 3829 patients met the inclusion criteria. The results of meta-analyses showed the following: (1) postoperative anastomotic leak: NSAIDs (including selective and nonselective NSAIDs) increased the incidence of anastomotic leak [odds ratio (OR)=3.02, 95% confidence interval (CI): 2.16-4.23, p=0.00001]. Further results showed that nonselective NSAIDs significantly increased the incidence of anastomotic leak (OR=2.96, 95% CI: 1.99-4.42, p<0.00001), and selective NSAIDs had no significant difference as compared with the control group using other analgesics (OR=2.27, 95% CI: 0.68-7.56, p=0.18); (2) postoperative cardiovascular events: NSAIDs (selective and nonselective NSAIDs) had no difference when compared with other analgesics (OR=0.50, 95% CI: 0.23-1.12, p=0.09); (3) postoperative surgical site infection: NSAIDs (selective and nonselective NSAIDs) and other analgesics had no difference in surgical site infection (OR=0.77, 95% CI: 0.52-1.15, p=0.20); (4) postoperative nausea and vomiting: NSAIDs (selective and nonselective NSAIDs) decreased the incidence of nausea and vomiting (OR=0.53, 95% CI: 0.34-0.81, p=0.003); (5) postoperative intestinal obstruction: NSAIDs (selective and nonselective NSAIDs) decreased the incidence of intestinal obstruction (OR=0.35, 95% CI: 0.13-0.89, p=0.03).

CONCLUSIONS

The meta-analysis suggests that postoperative NSAIDs, especially nonselective NSAIDs, could increase the incidence of anastomotic leak. NSAIDs could decrease postoperative nausea and vomiting and intestinal obstruction, but showed no difference in cardiovascular events and surgical site infection as compared with other analgesics.

Outcomes of Non-Operative Treatment for Duodenal Stump Leakage after Gastrectomy in Patients with Gastric Cancer

Purpose

We evaluated the clinical outcomes of the non-operative management of post-gastrectomy duodenal stump leakage in patients with gastric cancer.

Materials and Methods

A total of 1,230 patients underwent gastrectomy at our institution between 2010 and 2014. Duodenal stump leakage was diagnosed in 19 patients (1.5%), and these patients were included in this study. The management options varied with patient condition; patients were managed conservatively, with a pigtail catheter drain, or by tube duodenostomy via a Foley catheter. The patients' clinical outcomes were analyzed.

Results

Duodenal stump leakage was diagnosed in all 19 patients within a median of 10 days (range, 1~20 days). The conservative group comprised of 5 patients (26.3%), the pigtail catheter group of 11 patients (57.9%), and the Foley catheter group of 3 patients (15.8%). All 3 management modalities were successful; none of the patients needed further operative intervention. The median hospital stay was 18, 33, and 42 days, respectively.

Conclusions

Non-operative management of duodenal stump leakage for selected groups of patients with gastric cancer was effective for control of intra-abdominal sepsis. This management modality can help obviate the need for surgical intervention.

Strong poly(ethylene oxide) based gel adhesives via oxime cross-linking

There is a demand for materials to replace or augment the use of sutures and staples in surgical procedures. Currently available commercial surgical adhesives provide either high bond strength with biological toxicity or polymer and protein-based products that are biologically acceptable (though with potential sensitizing potential) but have much reduced bond strength. It is desirable to provide novel biocompatible and biodegradable surgical adhesives/sealants capable of high strength with minimal immune or inflammatory response. In this work, we report the end group derivatization of 8-arm star PEOs with aldehyde and amine end groups. Gels were prepared employing the Schiff-base chemistry between the aldehydes and the amines. Gel setting times, swelling behavior and rheological characterization were carried out for these gels. The mechanical-viscoelastic properties were found to be directly proportional to the crosslinking density of the gels, the 10K PEO gel was stiffer in comparison to the 20K PEO gel. The adhesive properties of these gels were tested using porcine skin and showed excellent adhesion properties. Cytotoxicity studies were carried out for the individual gel components using two different methods: (a) Crystal Violet Staining assay (CVS assay) and (b) impedance and cell index measurement by the xCELLigence system at concentrations >5%. Gels prepared by mixing 20% w/w solutions were also tested for cytotoxicity. The results revealed that the individual gel components as well as the prepared gels and their leachables were non-cytotoxic at these concentrations.

STATEMENT OF SIGNIFICANCE

This work presents a new type of glue that is aimed at surgery applications using a water soluble star shaped polymer. It show excellent adhesion to skin and is tough and easy to use. We show that it is very biocompatible based on tests on live human cells, and could therefore in principle be used for internal surgery. Comparison with other reported and commercial glues shows that it is stronger than most, and does not swell in water to the same degree as many other water based bioadhesives.

Effect of Postoperative Diclofenac on Anastomotic Strength and Histologic Healing in Rabbit Small Intestine

In this experimental study, we investigated the effects of a 5-day postoperative treatment with the nonsteroidal anti-inflammatory drug (NSAID) diclofenac on anastomotic healing in rabbits. NSAIDs are widely used analgesics in today's “fast-track surgery,” raising concerns about their potential negative effects on healing in humans. A total of 33 New Zealand White female rabbits underwent laparotomy and 2 separate end-to-end anastomoses of the ileum.. The animals were randomized to receive subcutaneous diclofenac 4 mg/kg/d (17 experimental rabbits) or subcutaneous isotonic saline 0.1 mL/kg/d (16 control rabbits) postoperatively. On the fifth postoperative day, the animals were humanely killed, and anastomotic leakage, anastomotic breaking strength, and histopathologic changes were evaluated. Breaking strength in the diclofenac group was 21% lower than in the placebo group (P = 0.027). Anastomotic leakage was found in 4 rabbits in the diclofenac group (26.7%). The rabbits treated with diclofenac demonstrated a 16% lower collagen deposition compared with the placebo group (P = 0.008). In our study, postoperative treatment with diclofenac had a negative effect on the anastomotic healing and strength in the ileum of rabbits. Caution should be taken in the use of diclofenac after gastrointestinal surgery.

Technical characteristics can make the difference in a surgical linear stapler. Or not?

BACKGROUND

Anastomotic leak (AL) after gastrointestinal surgery is a severe complication associated with relevant short- and long-term sequelae. Most of the anastomosis are currently performed with a surgical stapler that is required to have appropriate characteristics to guarantee good performances. The aim of our study was to evaluate, in the laboratory, pressure resistance and tensile strength of anastomosis performed with different surgical linear staplers, available in the market.

MATERIALS AND METHODS

We have been studying three linear staplers, with diverse cartridges and staple heights, of three different companies, used for gastrointestinal anastomosis and gastric or intestinal closure. We performed 50 anastomosis for each device, with the pertinent different cartridges, on fresh pig intestine, for a total of 350 anastomosis, then injected saline solution and recorded the pressure that provokes a leak on the staple line. There were no statistically significant differences between the mean pressure necessary to induce an AL in the various instruments (P > 0.05). For studying the tensile strength, we performed a total of 350 anastomosis with the different linear staplers on a special strong paper (Tyvek), then recorded the maximal tensile force that could open the anastomosis.

RESULTS

There were no statistically significant differences between the different staplers about the strength necessary to open the staple line (P > 0.05).

CONCLUSIONS

we demonstrated that different linear staplers of three companies available in the market give comparable anastomotic pressure resistance and tensile strength. This might suggest that small dissimilarities between different devices are not involved, at least as major parameters, in AL etiology.

Synthesis and properties of temperature-sensitive and chemically crosslinkable poly(ether-urethane) hydrogel

The PEU-MA solutions can gelate at physiological temperature, and be further crosslinked by UV light.

CT scan-based modelling of anastomotic leak risk after colorectal surgery

AIM

Prolonged ileus, low-grade fever and abdominal discomfort are common during the first week after colonic resection. Undiagnosed anastomotic leak carries a poor outcome and computed tomography (CT) scan is the best imaging tool for assessing postoperative abdominal complications. We used a CT scan-based model to quantify the risk of anastomotic leak after colorectal surgery.

METHOD

A case-control analysis of 74 patients who underwent clinico-radiological evaluation after colorectal surgery for suspicion of anastomotic leak was undertaken and a multivariable analysis of risk factors for leak was performed. A logistic regression model was used to identify determinant variables and construct a predictive score.

RESULTS

Out of 74 patients with a clinical suspicion of anastomotic leak, 17 (23%) had this complication confirmed following repeat laparotomy. In multivariate analysis, three variables were associated with anastomotic leak: (1) white blood cells count > 9 × 10(9) /l (OR = 14.8); (2) presence of ≥ 500 cm(3) of intra- abdominal fluid (OR = 13.4); and (3) pneumoperitoneum at the site of anastomosis (OR = 9.9). Each of these three parameters contributed one point to the risk score. The observed risk of leak was 0, 6, 31 and 100%, respectively, for patients with scores of 0, 1, 2 and 3. The area under the receiver operating characteristic curve for the score was 0.83 (0.72-0.94).

CONCLUSION

This CT scan-based model seems clinically promising for objective quantification of the risk of a leak after colorectal surgery.

Morbidity, mortality, cost, and survival estimates of gastrointestinal anastomotic leaks

BACKGROUND

Anastomotic leak, a potentially deadly postoperative occurrence, particularly interests surgeons performing gastrointestinal procedures. We investigated incidence, cost, and impact on survival of anastomotic leak in gastrointestinal surgical procedures at an academic center.

STUDY DESIGN

We conducted a chart review of American College of Surgeons NSQIP operative procedures with gastrointestinal anastomosis from January 1, 2003 through April 30, 2006. Each case with an American College of Surgeons NSQIP 30-day postoperative complication was systematically reviewed for evidence of anastomotic leak for 12 months after the operative date. We tracked patients for up to 10 years to determine survival. Morbidity, mortality, and cost for patients with gastrointestinal anastomotic leaks were compared with patients with anastomoses that remained intact.

RESULTS

Unadjusted analyses revealed significant differences between patients who had anastomotic leaks develop and those who did not: morbidity (98.0% vs. 28.4%; p < 0.0001), length of stay (13 vs. 5 days; p ≤ 0.0001), 30-day mortality (8.4% vs. 2.5%; p < 0.0001), long-term mortality (36.4% vs. 20.0%; p ≤ 0.0001), and hospital costs (chi-square [2] = 359.8; p < 0.0001). Multivariable regression demonstrated that anastomotic leak was associated with congestive heart failure (odds ratio [OR] = 31.5; 95% CI, 2.6-381.4; p = 0.007), peripheral vascular disease (OR = 4.6; 95% CI, 1.0-20.5; p = 0.048), alcohol abuse (OR = 3.7; 95% CI, 1.6-8.3; p = 0.002), steroid use (OR = 2.3; 95% CI: 1.1-5.0; p = 0.027), abnormal sodium (OR = 0.4; 95% CI, 0.2-0.7; p = 0.002), weight loss (OR = 0.2; 95% CI, 0.06-0.7; p = 0.011), and location of anastomosis: rectum (OR = 14.0; 95% CI, 2.6-75.5; p = 0.002), esophagus (OR = 13.0; 95% CI, 3.6-46.2; p < 0.0001), pancreas (OR = 12.4; 95% CI, 3.3-46.2; p < 0.0001), small intestine (OR = 6.9; 95% CI, 1.8-26.4; p = 0.005), and colon (OR = 5.2; 95% CI, 1.5-17.7; p = 0.009).

CONCLUSIONS

Significant morbidity, mortality, and cost accompany gastrointestinal anastomotic leaks. Patients who experience an anastomotic leak have lower rates of survival at 30 days and long term.

Infliximab's influence on anastomotic strength and degree of inflammation in intestinal surgery in a rabbit model

Background

Infliximab, a TNF-α inhibitor, is a potent anti-inflammatory drug in the treatment of inflammatory bowel diseases. Recent studies have investigated the effect of infliximab treatment on postoperative complications such as anastomotic leakage, however, with conflicting results and conclusions. The purpose of this study was to investigate whether a single dose infliximab has an adverse effect on the anastomotic healing process, observed as reduced anastomotic breaking strength and histopathologically verified lower grade of inflammatory response, in the small intestine of a rabbit.

Methods

Thirty New Zealand rabbits (median weight 2.5 kg) were allocated to treatment with an intravenous bolus of either 10 mg/kg infliximab (n = 15) or placebo (n = 15). One week later all rabbits underwent two separate end-to-end anastomoses in the jejunum under general anesthesia. At postoperative day three, the anastomotic breaking strength was determined and histopathological changes were examined.

Results

The mean value of anastomotic breaking strength in the placebo group was 1.89 ± 0.36 N and the corresponding value was 1.81 ± 0.33 N in the infliximab treated rabbits. There was no statistically significant difference between the groups (p = 0.51). The infliximab-treated rabbits had a significant lower degree of inflammatory infiltration response compared to the placebo group (p = 0.047).

Conclusions

Our conclusion, limited by the small sample sizes in both groups, is that a single dose of infliximab, given one week prior to surgery, does not have an impact on the anastomotic breaking strength on the third postoperative day in the small intestine of rabbits.

Abnormal vital signs are common after bowel resection and do not predict anastomotic leak

BACKGROUND

Anastomotic leak is a serious complication of gastrointestinal surgery. Abnormal vital signs are often cited in retrospective peer review and medicolegal settings as evidence of negligence in the failure to make an early diagnosis. We aimed to profile the postoperative courses of patients who undergo intestinal anastomosis and determine how reliably abnormal vital signs predict anastomotic leaks.

STUDY DESIGN

Consecutive patients undergoing bowel resection with anastomosis at an academic medical center from July 2009 through July 2011 were identified from a prospective complication database. The electronic medical record was queried for postoperative vital signs and laboratory studies, which were digitally abstracted. Abnormal values were defined as temperature >38°C, white blood cell count ≤4,000 or ≥12,000 cells/uL, systolic blood pressure ≤80 mmHg or diastolic blood pressure ≤50 mmHg, pulse ≥100 beats per minute, and respiratory rate ≥20 breaths per minute. Patients who developed an anastomotic leak were compared with those with an uncomplicated postoperative course.

RESULTS

Of the 452 patients, 141 (31.2%) suffered a total of 271 complications, including 19 anastomotic leaks. Even in "uncomplicated" recoveries, tachycardia and tachypnea were almost routine, occurring in more than half of the patients frequently throughout the postoperative period. Hypotension, fever, and leukocytosis were also remarkably common. The positive predictive value of any aberrant vital sign or white blood cell count ranged between 4% and 11%.

CONCLUSIONS

Abnormal vital signs are extremely common after bowel resection with anastomosis. Even sustained aberrant vital signs and/or leukocytosis are not necessarily suggestive of a leak or other postoperative complication.

Risk factors for failure of percutaneous drainage and need for reoperation following symptomatic gastrointestinal anastomotic leak

BACKGROUND

Few studies have evaluated the role of computed tomography-guided percutaneous drainage (PD) in the management of gastrointestinal (GI) anastomotic leaks.

METHODS

Ten-year review of an interventional radiology database identified patients with symptomatic GI anastomotic leaks. Clinical, laboratory, radiographic, and operative characteristics following a technically successful PD which then failed and required reoperation for anastomotic leak were compared with those successfully treated with PD.

RESULTS

Sixty-one patients met study inclusion criteria. Fifty patients (82%) successfully underwent therapeutic PD of a perianastomotic fluid collection, with median follow-up of 16 months. Eleven patients (18%), at a median interval of 16 days, required reoperation following PD. A forward logistic regression showed cardiopulmonary disease (P = .03) and cancer surgery (P = .01) to be factors independently associated with the need for reoperation. The level of the anastomosis, initial fecal diversion/stoma, fluid collection size, and microbiology of aspirate did not predict failure of PD.

CONCLUSIONS

Cardiopulmonary disease and cancer surgery appear to be independent predictors for failure of PD and need for reoperation following a symptomatic GI anastomotic leak.

[Procalcitonin and C-reactive protein as early indicators of postoperative intra-abdominal infection after surgery for gastrointestinal cancer]

AIM

to evaluate the association between serum levels of procalcitonin and C-reactive protein, on the first 3 postoperative days, and the appearance of postoperative intra-abdominal infection.

METHOD

Prospective observational study including 67 patients operated on for colo-rectal, gastric and pancreatic cancer. Serum levels of procalcitonin and C-reactive protein were analyzed before surgery and daily until the third postoperative day. Values of procalcitonin (PCT) and C-reactive protein (CRP) were recorded as well as their accuracy for detection of postoperative intra-abdominal infection (PIAI).

RESULTS

The incidence of postoperative intra-abdominal infection was 13.4%. CRP serum levels at 72h, PCT serum levels at 24, 48 and 72h and the ratio between serum levels of CRP at 72hours and serum levels of CRP at 48hours (CRP D3/CRP D2) were significantly associated with the appearance of postoperative intra-abdominal infection. The highest sensitivity corresponded to PCT at 72hours (88.9%); the highest specificity and positive predictive value corresponded to the ratio CRP D3/CRP D2 (96.49% and 71.4%, respectively); the highest negative predictive value to procalcitonin at 72h and 24h.

CONCLUSIONS

Serum levels of PCT are significantly associated with the appearance of postoperative intra-abdominal infection. Sensitivity and predictive positive values are low, but negative predictive value is high, even at 24h after surgery.

The burden of gastrointestinal anastomotic leaks: an evaluation of clinical and economic outcomes

OBJECTIVE

To evaluate the clinical and economic burden associated with anastomotic leaks following colorectal surgery.

METHODS

Retrospective data (January 2008 to December 2010) were analyzed from patients who had colorectal surgery with and without postoperative leaks, using the Premier Perspective™ database. Data on in-hospital mortality, length of stay (LOS), re-admissions, postoperative infection, and costs were analyzed using univariate and multivariate analyses, and the propensity score matching (PSM) and generalized linear models (GLM).

RESULTS

Of the patients, 6,174 (6.18 %) had anastomotic leaks within 30 days after colorectal surgery. Patients with leaks had 1.3 times higher 30-day re-admission rates and 0.8-1.9 times higher postoperative infection rates as compared with patients without leaks (P < 0.001 for both). Anastomotic leaks incurred additional LOS and hospital costs of 7.3 days and $24,129, respectively, only within the first hospitalization. Per 1,000 patients undergoing colorectal surgery, the economic burden associated with anastomotic leaks--including hospitalization and re-admission--was established as 9,500 days in prolonged LOS and $28.6 million in additional costs. Similar results were obtained from both the PSM and GLM for assessing total costs for hospitalization and re-admission.

CONCLUSIONS

Anastomotic leaks in colorectal surgery increase the total clinical and economic burden by a factor of 0.6-1.9 for a 30-day re-admission, postoperative infection, LOS, and hospital costs.

Self-expanding metal stents or nonstent endoscopic therapy: which is better for anastomotic leaks after total gastrectomy?

BACKGROUND

Anastomotic leaks are a life-threatening complication of gastrectomies with high mortality after surgical reintervention. Endoscopic therapy using fibrin glue injection, endoclip, and other devices is an alternative to surgical intervention for anastomotic leaks. Recently, self-expanding metal stents (SEMS) were introduced to treat anastomotic leaks. The purpose of this study was to assess the clinical characteristics and therapeutic outcomes of SEMS and nonstent endoscopic therapy (NSET) for treatment of anastomotic leaks after total gastrectomy with the aim of assisting endoscopists in choosing a treatment method.

METHODS

Between July 2002 and March 2013, 13 patients treated with SEMS and 14 patients treated with NSET for anastomotic leaks after total gastrectomy were enrolled onto the study. Enrolled patients received 16 SEMS placement sessions and 21 NSET sessions.

RESULTS

No significant differences in baseline characteristics or clinical characteristics related to leakage were detected in patients with SEMS compared to NSET. The successful sealing rate at the first attempt by SEMS was significantly better than that of NSET (80.0 vs. 28.6 %, P = 0.036), whereas the successful sealing rate after multiple endoscopic treatments was not statistically different (80.0 vs. 64.3 %, P = 0.653). The main reason for reintervention with SEMS was complications and with NSET was nonseal (P = 0.004). Clinical outcomes including length of hospital stay, endoscopic treatment-related mortality, and all-cause mortality were not significantly different between the 2 groups.

CONCLUSIONS

In terms of efficacy by single effort, SEMS was superior to other methods for treating anastomotic leaks after total gastrectomy. However, complications with SEMS should be considered when choosing an endoscopic treatment method.

Laser welding of ruptured intestinal tissue using plasmonic polypeptide nanocomposite solders

Approximately 1.5 million people suffer from colorectal cancer and inflammatory bowel disease in the United States. Occurrence of leakage following standard surgical anastomosis in intestinal and colorectal surgery is common and can cause infection leading to life-threatening consequences. In this report, we demonstrate that plasmonic nanocomposites, generated from elastin-like polypeptides (ELPs) cross-linked with gold nanorods, can be used to weld ruptured intestinal tissue upon exposure to near-infrared (NIR) laser irradiation. Mechanical properties of these nanocomposites can be modulated based on the concentration of gold nanorods embedded within the ELP matrix. We employed photostable, NIR-absorbing cellularized and noncellularized GNR-ELP nanocomposites for ex vivo laser welding of ruptured porcine small intestines. Laser welding using the nanocomposites significantly enhanced the tensile strength, leakage pressure, and bursting pressure of ruptured intestinal tissue. This, in turn, provided a liquid-tight seal against leakage of luminal liquid from the intestine and resulting bacterial infection. This study demonstrates the utility of laser tissue welding using plasmonic polypeptide nanocomposites and indicates the translational potential of these materials in intestinal and colorectal repair.

Endoscopic management of anastomotic leakage after gastrectomy for gastric cancer: how efficacious is it?

BACKGROUND

Anastomotic leak is a dreadful complication with a high mortality rate. The authors aimed to evaluate the efficacy of endoscopic closure of anastomotic dehiscence after gastrectomy in patients with gastric cancer.

METHODS

The authors retrospectively reviewed 33 patients with anastomotic leakage who had underdone endoscopic treatment among 5249 patients with gastric cancer who underwent radical total or subtotal gastrectomy. Methods of endoscopic closure included clipping with or without detachable snare, fibrosealant, Histoacryl® or stent insertion. Results of endoscopic treatment were categorized as complete, partial closure and failure.

RESULTS

The size of the tissue defect was the only factor that had statistically significant differences among the cases with complete closure, partial closure and failure (p = 0.005). For tissue defects smaller than 2 cm in size, complete closure was achieved in 19 (73.1%), partial closure in 5 patients (19.2%) and 2 failed (7.6%). For those larger than 2 cm in size, one (14.3%) was completely closed, four (57.1%) were partially closed and two (28.6%) failed.

CONCLUSIONS

Endoscopic treatment for anastomotic dehiscence smaller than 2 cm in size had excellent success rate in this study.

Simultaneous Assessment of Luminal Integrity and Vascular Perfusion of the Gastrointestinal Tract Using Dual-Channel Near-Infrared Fluorescence

Anastomotic complications such as stenosis and leakage in the gastrointestinal (GI) tract can cause high patient morbidity and mortality. To identify the potential preconditions of these complications intraoperatively, we explored the use of two 700 nm near-infrared (NIR) fluorophores administered intraluminally: (1) chlorella, an over-the-counter herbal supplement containing high concentrations of chlorophyll, and (2) methylene blue (MB). In parallel, we administered the 800 nm NIR fluorophore indocyanine green (ICG) intravenously to assess vascular function. Dual-channel, real-time intraoperative imaging and quantitation of the contrast to background ratio (CBR) were performed under normal conditions or after anastomosis or leakage of the stomach and intestines in 35 kg Yorkshire pigs using the Fluorescence-Assisted Resection and Exploration (FLARE) imaging system. Luminal integrity could be assessed with relatively high sensitivity with either chlorella or MB, although chlorella provided significantly higher CBR. ICG angiography provided assessment of blood perfusion of normal, ischemic, and anastomotic areas of the GI tract. Used simultaneously, 700 nm (chlorella or MB) and 800 nm (ICG) NIR fluorescence permitted independent assessment of luminal integrity and vascular perfusion of the GI tract intraoperatively and in real time. This technology has the potential to identify critical complications, such as anastomotic leakage, intraoperatively, when correction is still possible.

The effect of fibrin glue on the early healing phase of intestinal anastomoses in the rat

PURPOSE

Protecting the anastomotic integrity using suture or staple line reinforcement remains an important goal for ongoing research. The present comprehensive study aims to establish the effects of fibrin glue on the early phase of anastomotic healing in the rat intestine.

METHODS

One hundred and eight young adult male Wistar rats underwent resection and anastomosis of both the ileum and colon. In half, fibrin glue was applied around the anastomoses. Parameters for repair included wound strength, both bursting pressure and breaking strength at days 1, 3, and 5 after operation; hydroxyproline content; and histology, the latter also after 7 days.

RESULTS

A transient colonic ileus was observed in the experimental group. Anastomotic breaking strength was always similar in both the control and fibrin glue groups. Anastomotic bursting pressures remained low at days 1 and 3, without any differences between the groups. In both groups, the bursting pressure increased sharply (p < 0.001) between days 3 and 5. At day 5, the bursting pressure in the fibrin glue group remained below than that in the controls, although only significantly (p = 0.0138) so in the ileum. At day 5, but not at day 7, the wounds in the fibrin glue group contained less collagen. Other aspects of microscopic wound architecture appeared to be the same.

CONCLUSIONS

There is no justification for using fibrin glue on patent anastomoses constructed under low-risk conditions. Its potential benefit under conditions where chances for anastomotic leakage are enhanced needs further investigation.

Evaluation of Bioabsorbable Seamguard for Staple Line Reinforcement in Stapled Rectal Anastomoses

Introduction. The concept of staple line reinforcement is a growing area of interest. This study evaluated the feasibility and effect of using bioabsorbable Seamguard (BSG) to bolster end-to-end stapled rectal anastomoses in a porcine model. Methods. Eleven female 45-kg Yucatan domestic pigs were used. Each animal served as its own control by creating a BSG and nonreinforced anastomosis using a 29-mm end-to-end anastomotic stapling device. Reinforced anastomoses were randomized to proximal and distal positions along the rectum. Each staple line reinforcement agent consisted of adding BSG to the stapling device according to the manufacturer’s instructions. Barium enemas were then performed and the 2 anastomotic sites harvested. Each anastomosis underwent burst testing. The internal diameter of each anastomosis was measured and underwent pathologic review. Results. Bolstered anastomoses offered no strength advantage as burst pressures were no different as compared with unbolstered anastomoses. There was also no difference in anastomotic internal or external diameters. Only 1 stapled anastomosis burst during testing and none in the bolstered group. On histological analysis, there was a significant increase in inflammatory infiltrate in the bolstered group as compared with the stapled group ( P = .041), with a higher incidence of lymphocytes ( P = .047) and giant cells ( P = .037). There was no difference in mucosal loss at the anastomotic site, neovascularization, fibroblast presence, extent of fibrosis, muscle layer disruption, percentage of anastomosis replaced by collagen, and elastin deposition. Conclusions. The routine use of BSG bolsters in stapled rectal anastomoses is safe and results in equivalent anastomotic strength as traditional stapled anastomoses.

Risk of anastomotic leakage with use of NSAIDs after gastrointestinal surgery

PURPOSE

Analgesic regimes to avoid opioid-related adverse effects have been recommended in gastrointestinal surgery. Non-steroidal anti-inflammatory drugs (NSAIDs) are an important component of opioid sparing regimes in that these drugs indirectly reduce pain by inhibiting inflammation. Although beneficial for most surgical patients, animal studies and recent clinical studies suggest a harmful effect on new intestinal anastomoses by increasing the rate of leakage. NSAIDs may indirectly disturb anastomotic healing by inhibiting inflammation as an integrated part of the wound healing process in an early, critical phase after surgery.

METHODS

A literature review based on a structured search in PubMed of clinical and experimental studies investigating the effects of NSAIDs on anastomotic healing and leakage rates after intestinal surgery, as well as proposed mechanisms and effects studied in animal models.

RESULTS

Three recent observational cohort studies (accumulated n = 882) indicate an increased rate of anastomotic leakages (15-21%) associated with cyclooxygenase-2 (COX-2) selective NSAIDs after intestinal surgery compared to the leakage rates in controls or historical cohorts (1-4%). Three prospective studies on related topics contain relevant data on NSAIDs and are compared to these studies. Several experimental animal studies support an increased risk for anastomotic leakage with the use of NSAIDs.

CONCLUSION

The reported effects of NSAIDs on anastomotic healing suggest an increased risk for leakage. A better understanding of the complex interactions of NSAID-induced inhibition on anastomotic healing is a prerequisite for the safe use of NSAIDs. Until more data are available, a careful use of NSAIDs may be warranted in gastrointestinal anastomotic surgery.

Factors Influencing the Outcome of Intestinal Anastomosis

Anastomotic leak (AL) is one of the most serious complications after gastrointestinal surgery. All patients aged 16 years or older who underwent a surgery with single intestinal anastomosis at Morristown Medical Center from January 2006 to June 2008 were entered into a prospective database. To compare the rate of AL, patients were divided into the following surgery-related groups: 1) stapled versus hand-sewn, 2) small bowel versus large bowel, 3) right versus left colon, 4) emergent versus elective, 5) laparoscopic versus converted (laparoscopic to open) versus open, 6) inflammatory bowel disease versus non inflammatory bowel disease, and 7) diverticulitis versus nondiverticulitis. We also looked for surgical site infection, estimated intraoperative blood loss, blood transfusion, comorbidities, preoperative chemotherapy, radiation, and anticoagulation treatment. The overall rate of AL was 3.8 per cent. Mortality rate was higher among patients with ALs (13.3%) versus patients with no AL (1.7%). Open surgery had greater risk of AL than laparoscopic operations. Surgical site infection and intraoperative blood transfusions were also associated with significantly higher rates of AL. Operations involving the left colon had greater risk of AL when compared with those of the right colon, sigmoid, and rectum. Prior chemotherapy, anticoagulation, and intraoperative blood loss all increased the AL rates. In conclusion, we identified several significant risk factors for ALs. This knowledge should help us better understand and prevent this serious complication, which has significant morbidity and mortality rates.

An alternative to conventional hand-sewing colocolic anastomosis: anastomosis with absorbable surgical barrier film without sutures

AIM

As a result of its high morbidity and mortality rates, anastomotic leakage is one of the most feared complications in colorectal surgery. Therefore, this issue is one of the most relevant in colorectal surgery and a lot of work has been conducted to research it. The aim of this experimental study was to compare colocolic anastomosis performed by using absorbable surgical barrier film without suture and conventional anastomosis performed by hand-sewing technique in terms of anastomosis safety.

METHOD

In this study, 40 Norway Wistar Albino 3-month-old female rats were used. Each weighed between 250 and 300g. The rates were divided into two groups, a control group and an experimental group. Full-thickness incisions were made on the ascending colon of both groups of rats. The control group's anastomoses were conducted using a hand-sewn technique consisting of one layer of nonabsorbable sutures (Gambee suture). The experimental group's anastomoses were performed using absorbable surgical barrier film without sutures. Afterwards, sample pieces of the anastomosis area were taken from all rats on either the 3rd or the 7th day following the operation, resulting in subgroups that led to a total of four test groups. The samples taken were subjected first to an anastomosis bursting pressure test followed by histopathological examinations and a test to detect the levels of hydroxyproline in the tissue.

RESULTS

The control groups (groups 1 and 3) had average anastomotic bursting pressures of 33.0±9.49mmHg and 146.0±15.06mmHg respectively, whereas experimental groups (groups 2 and 4) had average anastomotic bursting pressures of 58.0±10.33mmHg and 190.0±25.82mmHg respectively. Mann-Whitney U-test analysis of the bursting pressure values indicates the differences between groups 1 and 2 (3rd day postoperatively) and groups 3 and 4 (7th day postoperatively) to be statistically significant (P=0.0001 and P=0.0003 respectively). Values obtained from histopathological staging conducted according to the Ehrlich-Hunt model where the evaluation criteria in this model are: amount of inflammatory cells, fibroblasts, neovascularization and collagen and which were analysed using the Mann-Whitney U-test have shown no significant difference between 3rd day postoperatively groups 1 and 2 (P=0.579) while the difference between 7th day postoperatively groups 3 and 4 was found to be significant (P=0.023). Average levels of hydroxyproline in the tissue were 88.18±8.04mg/l for group 1, 56.31±5.40mg/l for group 2, 135.0± 6.30mg/l for group 3 and 100.2±15.42mg/l for group 4. Analysis of values in the groups using the Mann-Whitney U-test indicate a significant difference (P < 0.0001) both between groups 1 and 2 and between groups 3 and 4.

CONCLUSION

The use of absorbable surgical barrier film without sutures for colocolic anastomosis in rats may be safe.

Management and outcome of anastomotic leakage after colonic surgery

AIM

Anastomotic leakage remains a key factor for morbidity after colonic surgery. The aim of the study was to analyse the outcome of different therapeutical approaches.

METHOD

Of 1731 consecutive patients undergoing colonic resection between 1998 and 2005 at our institution, 67 patients with anastomotic leakage were identified from a prospective database. A logistic regression model was used to determine factors which influenced the therapeutic approach and outcome.

RESULTS

The overall anastomotic leakage rate was 3.5%. All patients were re-operated. The anastomosis was resected without restoration of continuity in 31 but preserved in 36 patients. An ileostomy was constructed in 27 of 36 patients with anastomotic leakage after repair or revision of the anastomosis, the remaining nine cases were treated without ileostomy. Five of these latter nine vs three of the 27 patients with ileostomy experienced re-leakage (P = 0.05). The overall mortality was 25%. The Mannheim Peritonitis Index was 17.44 for survivors vs 25.64 for nonsurvivors (P < 0.001). Restoration of intestinal continuity was performed in 95% of the patients with ileostomy and in 88% after Hartmann's procedure. Multivariate analysis identified multi organ failure as the only factor predictive of a fatal outcome (P < 0.001). An ASA-score of more than 2 (P = 0.02) and peritonitis (P = 0.002) were reasons for not preserving the anastomosis.

CONCLUSION

Repair or redo of the anastomosis without a protective ileostomy frequently results in failure of the procedure. After Hartmann's operation or split stoma creation a majority of patients undergo restoration of intestinal continuity.

Clinical implication of positive oral contrast computed tomography for the evaluation of postoperative leakage after gastrectomy for gastric cancer

OBJECTIVE

To evaluate the clinical usefulness of positive oral contrast computed tomography (CT) for the detection of leakage and its relationship with the immediate postoperative outcome after gastrectomy for gastric cancer.

METHODS

A total of 210 patients with a clinical suspicion of leakage after gastrectomy for gastric cancer underwent a positive oral contrast CT. Two radiologists retrospectively reviewed the CT images, recorded the presence of extraluminal contrast leakage, and graded the amount of leaked contrast. The rate of postoperative intervention treatment, the length of postoperative hospital stay, and mortality rates were correlated with the presence and grades of leakage. Matching accuracy between CT and other diagnostic studies in detection of leakage was also evaluated.

RESULTS

There were 162 patients without extraluminal contrast leakage (77.1%), 13 with grade 1 leakage (6.2%), 19 with grade 2 (9.0%), and 16 with grade 3 (7.6%). Postoperative intervention rate, hospital stay, and mortality were significantly higher in patients with extraluminal contrast than those in patients without extraluminal contrast (P < 0.05). Postoperative hospital stays increased as the leakage grades increased (P = 0.0008). The matching accuracy between CT and other studies was 82.1% (n = 32/39).

CONCLUSIONS

Positive oral contrast CT can be a reliable tool for diagnosing postoperative leakage that requires further intervention after gastrectomy in gastric cancer patients, and the immediate postoperative outcome may be related with the grade of leaked contrast on CT.

1.5:1 Meshed AlloDerm Bolsters for Stapled Rectal Anastomoses Does Not Provide Any Advantage in Anastomotic Strength in a Porcine Model

Introduction: The most feared complication of colorectal anastomoses is leaks resulting in severe morbidity. The concept of staple-line reinforcement is a growing area of interest. In this study, the authors evaluated the feasibility and effect of using 1.5:1 meshed AlloDerm to bolster end-to-end stapled rectal anastomoses in a porcine model. Methods: A total of 30 female 45-kg domestic pigs were studied, and each served as its own control by creating a bolstered and unbolstered anastomosis in each animal. All anastomoses were created with a 29-mm end-to-end stapling device. Bolstered anastomoses were randomized to proximal and distal positions along the rectum, and each rectorectal anastomosis was separated by an average of 10 cm. The animals were survived to 3, 5, and 30 days. Barium enemas were then performed and the 2 anastomotic sites harvested. Each anastomosis underwent burst testing. The internal diameter of each anastomosis was measured, and a biochemical analysis was performed for elastin and collagen content. Results: Bolstered anastomoses offered no strength advantage as burst pressures were no different when compared with unbolstered anastomoses. There was also no difference in anastomotic internal diameter, biochemical analysis of elastin or collagen, or presence of adhesions when comparing bolstered with unbolstered anastomoses. There were 4 subclinical leaks—1 in the unbolstered group and 3 in the bolstered group. Conclusions: The routine use of 1.5:1 meshed AlloDerm sandwich bolsters in stapled rectal anastomosis does not confer any detectable advantage in anastomotic strength. Further studies are needed to determine equivalence to traditional stapled anastomoses.

Temporal expression of cytokines in rat cutaneous, fascial, and intestinal wounds: a comparative study

BACKGROUND

Previous studies have shown that healing in intestinal wounds is proportionally faster than skin. Cytokines and growth factors play a major role in these coordinated wound-healing events. We hypothesized that this more rapid intestinal healing is due to an early upregulation of proinflammatory cytokines (IL-1beta, TNF-alpha, and IFN-gamma), followed by increases in the expression of the anti-inflammatory cytokine IL-10 and growth factor TGF-beta.

METHODS

Four wounds (skin, fascia, small intestinal, and colonic anastomosis) were created in each of 48 juvenile male Sprague Dawley rats; tissue samples of each site were harvested at 0, 1, 3, 5, 7, and 14 days postoperatively (n = 8/group) and levels of IL-1beta, IFN-gamma, TNF-alpha, IL-10 and TGF-beta expression from each site were measured using ELISA kits.

RESULTS

IL-1beta expression peaked earlier in small-intestinal and colonic wounds when compared to skin or fascia (e.g., small intestine: day 3 and colon day 5, P < 0.05 by ANOVA). Post-wounding levels of TNF-alpha were elevated in fascial wounds, but decreased in small-intestinal and colonic wounds. IFN-gamma levels were not significantly altered in any wounds. IL-10 showed a similar downregulation pattern in all wounds, while TGF-B levels were decreased in colonic and fascial wounds, but relatively unchanged in SI and skin.

CONCLUSIONS

An earlier peak in IL-1beta levels and a consistent decrease in TNF-alpha were seen in healing intestinal tissues; but no clear pattern of increased anti-inflammatory or regulatory cytokines was seen, which might explain the earlier healing of intestinal tissues. Additional studies are required to determine the role of individual cytokines, or the intrinsic reactivity of the tissues may explain the site specific differences of healing rates in different tissues.

Diagnosis of gastrointestinal anastomotic dehiscence after hospital discharge: Impact on patient management and outcome

BACKGROUND

Anastomotic leaks are inevitable complications of gastrointestinal surgery. Early hospital discharge protocols have increased concern regarding outpatient presentation with anastomotic leaks.

METHODS

One hundred anastomotic leaks in 5,387 intestinal operations performed at a single institution from 2002 to 2007 were identified from a prospectively maintained database. Statistical analysis was conducted by the unpaired t test, Chi-square test, and analysis of variance.

RESULTS

Overall anastomotic leak with a rate of 2.6% for colonic and 0.53% for small bowel anastomoses. Mean time to anastomotic leak diagnosis was 7 days after operation. Twenty-six patients presented after discharge, with mean time to diagnosis 12 days versus 6 days for inpatients (P<.05). Patients presenting after hospital discharge were younger, had lesser American Society of Anesthesiologists (ASA) scores, and were more likely to have colon cancer and less likely to have Crohn's disease. Ninety-two patients required operative management, of whom 81 (90%) underwent diversion. No difference in management, intensive care unit (ICU) requirement, duration of stay, or mortality between inpatient versus outpatient diagnosis was demonstrated. Follow-up at mean of 36 months demonstrated no difference in readmission, reoperation, or mortality rate between outpatient and inpatient diagnosis. Restoration of gastrointestinal continuity was achieved in 61-67% in the outpatient and 59% in the inpatient group (P=NS).

CONCLUSION

Outpatient presentation delays diagnosis but does not alter management or clinical outcome, or decrease the probability of ostomy reversal. Prolonging hospital stay to capture patients who develop anastomotic leak seems to be unwarranted. For patients requiring operative management, we recommend diversion as the safest option with a subsequent 61% reversal rate.

Abdominal computed tomography for diagnosing postoperative lower gastrointestinal tract leaks

BACKGROUND

Computed tomography (CT) is the most readily available imaging tool for diagnosis of postoperative lower gastrointestinal tract (LGIT) leak. The accuracy and sensitivity of CT for diagnosing a leak from a hollow viscous or anastomotic bowel leakage are still not well established. This retrospective study was conducted in order to define the role of CT in this setting.

STUDY DESIGN

The medical records of patients who underwent early relaparotomy (within 30 days) due to LGIT leak following a previous surgery in our department between 1998 and 2006 were reviewed. The ones whose abdominal CTs were done within 72 h prior to the repeated surgery with the aim of ruling out an intraabdominal infection or leak were studied, and the results were compared to the postsurgical findings.

RESULTS

Seventy patients were reoperated shortly following abdominal surgery due to postoperative LGIT leak. Forty-one of them had undergone 45 CT studies within 72 h before reoperation. Another 29 patients underwent a second procedure based on clinical presentation. Reoperation was done after an interval of 7.3 +/- 4.4 days in patients who underwent CT studies and after 4.5 +/- 2.3 days in patients without CTs (p = 0.003). Preoperative CTs identified only 47% of the leaks.

CONCLUSIONS

CT studies on patients shortly after abdominal surgery are not definitive. A negative CT study does not rule out LGIT leak. Clinically based decision making and exploratory relaparotomy still do play a role in those patients with suspicion for LGIT leak.

The advantages and disadvantages of a Roux-en-Y reconstruction after a distal gastrectomy for gastric cancer

In Japan, the Billroth I and Billroth II operations have been used for reconstruction after a distal gastrectomy for gastric cancer. However, a Roux-en-Y reconstruction is increasingly performed to prevent duodenogastric reflux. We herein discuss the indications for Roux-en-Y in gastric surgery and review the literature to determine its advantages and disadvantages. Indications for Roux-en-Y reconstruction after a distal gastrectomy are: (a) When the primary lesion has directly invaded the duodenum or head of the pancreas, the Billroth I operation is likely to result in local recurrence near the anastomosis; (b) in addition, the Billroth I operation is not indicated after a subtotal gastrectomy due to an unacceptable anastomotic tension; reconstruction using a nonphysiological route is therefore preferred. The advantages of Roux-en-Y reconstruction after a distal gastrectomy include a reduction of reflux gastritis and esophagitis, a decreased probability of gastric cancer recurrence, and a reduction in the incidence of surgical complications such as ruptured suture lines. The disadvantages of Roux-en-Y reconstruction include the possible development of stomal ulcer, an increased probability of cholelithiasis, increased difficulty with an endoscopic approach to the ampulla of Vater, and the possibility of Roux stasis syndrome. The principal advantage of a Roux-en-Y reconstruction is that it is less likely than the Billroth I operation to result in duodenogastric reflux. Roux-en-Y reconstruction or Billroth I operation can only be selected after considering their respective advantages and disadvantages.

Influence of Pneumoperitoneum on Small Bowel Anastomoses: A Histological Analysis in the Rat Model

Laparoscopic techniques are increasingly applied for the treatment of diverse gastrointestinal diseases. With regard to reports of a pronounced decrease of intra-abdominal blood flow with increasing intra-abdominal pressure, the present study investigates the impact of pressure and gas type on ischemia in small bowel anastomoses in the rat model. Laparotomy and ileoileal anastomosis were performed in 39 male Sprague-Dawley rats. A CO2 or helium pneumoperitoneum of 3 mm Hg or of 6 mm Hg was maintained before and after anastomoses. Rats in the control group received no pneumoperitoneum. Animals were sacrificed after 5 d, and the anastomotic region was explanted for subsequent histopathological examinations. In hematoxylin and eosin (HE)-stained sections, the Chiu score, villi configuration, and number of goblet cells were analyzed. Proliferation (Ki67) and expression of a matrix metalloproteinase (MMP-8) were examined by immunohistochemistry. Mucosal damage according to the scoring system by Chiu, the number of goblet cells, the villus length, the proliferation (Ki67), and the submucosal expression of MMP-8 was similar in all groups. Our results suggest that within a certain range of pressures and time, laparoscopic assisted surgery using CO2 pneumoperitoneum can be performed safely. Helium gas offers no advantages over CO2.