Emerging Trends in the Etiology, Prevention, and Treatment of Gastrointestinal Anastomotic Leakage

Layer-specific molecular signatures of colon anastomotic healing and leakage in mice

BACKGROUND

Colon anastomotic leakage (CAL) is a postoperative complication originating from disturbed colon anastomotic healing (CAH). Wound healing involves several well-coordinated stages, which have not been comprehensively studied for CAH or CAL. This study aims to provide transcriptional profiles of different intestinal layers of anastomotic tissues throughout distinct healing stages and to identify CAL-related genes.

METHODS

Proximal colon anastomosis was constructed with 8 interrupted sutures in mice. Six hours, 24 h and 72 h after surgery, anastomotic complications were assessed. Transcriptional profiles of inner (mucosa and submucosa) and outer (muscularis externa) layer of the anastomotic and naive control tissues were analyzed with 3' bulk mRNA sequencing to identify the layer-specific healing and leakage pathways. Selective target genes differing between CAL and CAH were measured for their protein expression.

RESULTS

Our data indicate that the mucosa/submucosa and muscularis externa enter inflammation stage at 6 h, proliferation stage at 24 h and tissue remodeling stage at 72 h during CAH. We observed that transcription profiles of the mucosa/submucosa, but not the muscularis externa, differ between CAH and CAL. Particularly, genes related to extracellular remodeling (including Col18a1 and Col16a1) and wound healing (Pdpn and Timp1) showed lower expression in the mucosa/submucosa of CAL tissue compared to CAH. Conformingly, protein levels for collagens as well IL-34 were decreased in CAL, while the TGF-β-pseudo-receptor BAMBI was increased in CAL compared to CAH tissues.

CONCLUSIONS

Mucosa/submucosa and muscularis externa are mostly in synchronization during the inflammation, proliferation, and extracellular remodeling stages during CAH. Transcriptional profiles within the anastomotic mucosa/submucosa differ between CAH and CAL in genes related to extracellular modelling and wound healing, indicating that genes of these pathways may contribute to CAL.

Evaluation of anastomotic blood supply during digestive tract reconstruction with the use of the oxygen saturation index: A pooling up analysis

PURPOSE

Anastomotic leakage (AL) is one of the most serious clinical complications in digestive tract reconstruction (DTR) surgery, and it is currently hypothesized that this may be related to insufficient anastomotic blood supply. Thus, Therefore, we aimed to assess the ability of tissue oxygen saturation(StO2) as a measure to evaluate anastomotic blood supply.

METHODS

A comprehensive literature search was performed using Embase, PubMed and Cochrane Library. StO2 was used as an evaluation index of anastomotic blood supply after DTR to analyze the potential association between this index and the occurrence of AL in the postoperative period.

RESULTS

A total of eleven articles involving 867 participants were included in this systematic review and meta-analysis. After pooling the standardized mean difference (SMD) and 95% confidence intervals (Cls), low StO2 was found to be an independent risk factor for AL (P < 0.00001; 95%CI: 1.02 [0.53-1.51]). The mean StO2 in the AL group (62.3%) was significantly lower than that in the non-AL group (74.3%); AL incidence increased with the reduction of StO2 to a certain value to 201.8% and 338.1% respectively.

CONCLUSION

Oxygen saturation index can be utilized in DTR to accurately and quantitatively evaluate the anastomotic blood supply to reduce the probability of postoperative AL.

Is end-to-end or side-to-end anastomotic configuration associated with risk of positive intraoperative air leak test in left-sided colon and rectal resections for colon and rectal cancers?

BACKGROUND

Anastomotic leak after colorectal resection is associated with morbidity, mortality, and poor bowel function. Minimal data exist on the relationship between anastomotic technique, intraoperative leak test, and subsequent clinical leak, particularly on the utility of performing end-to-end anastomosis (EEA) vs non-EEA (NEEA) to avoid postoperative leaks. This study aimed to analyze potential associations between anastomotic construction, intraoperative anastomotic assessments, and clinical leak.

METHODS

This was a retrospective cohort study comparing anastomotic techniques used in patients with colorectal cancer who underwent left-sided colorectal resections with colorectal or coloanal anastomoses at a tertiary care center. The outcomes were rates of intraoperative air leak, incomplete anastomotic donuts, and postoperative clinical leak. Univariate and multivariate analyses were performed to evaluate the potential association between anastomotic technique and intraoperative anastomotic assessments and subsequent leak.

RESULTS

Among 844 patients, 27 (3.2%) had intraoperative leak, 6 (0.7%) had incomplete donuts, and 27 (3.2%) experienced clinical leak. Of note, 500 patients (59.2%) had EEAs, and 344 patients (40.7%) had NEEAs. There were no significant differences in demographics or comorbidities between groups (P >.05) or rates of incomplete donuts (P =.07). EEA was associated with significantly more intraoperative air leaks than NEEA on univariate analysis (4.9% vs 1.2%, respectively; P =.005) and multivariate analysis (odds ratio [OR], 3.6; 95% CI, 1.01-12.50; P =.049). There was no difference in postoperative clinical leak between the groups on univariate analysis (3.0% in EEA vs 3.5% in NEEA; P =.69) or multivariate analysis (OR, 0.97; 95% CI, 0.40-2.34; P =.94).

CONCLUSION

EEA is associated with higher rates of intraoperative air leak than NEEA, even after adjusting for potential confounders.

Usefulness of Serum Biomarkers in Predicting Anastomotic Leakage After Gastrectomy

BACKGROUND/OBJECTIVES

Anastomotic leakage (AL) is one of the most concerning complications following gastrectomy. The aim of this study was to assess and compare the predictive accuracy of C-reactive protein (CRP), procalcitonin (PCT), the neutrophil-to-lymphocyte ratio (NLR), the platelet-to-lymphocyte ratio (PLR), fibrinogen, and the mean platelet volume (MPV) in the early diagnosis of post-gastrectomy AL.

METHODS

A prospective bicentric observational study was conducted including all patients undergoing elective gastrectomy between August 2018 and December 2022. The performance of the selected biomarkers in predicting the existence of AL within the first 7 postoperative days (PODs) was assessed.

RESULTS

A total of 107 patients were included for analysis. The incidence of AL was 20.56%, and the median day of diagnosis was on POD5 (interquartile range 4-6). CRP, PCT, the NLR, the PLR, and fibrinogen showed significant associations with the presence of AL (from POD2 for CRP and fibrinogen and from POD3 for PCT, NLR, and PLR). CRP demonstrated a superior predictive accuracy on POD4, with a threshold value of 181.4 mg/L (NPV 99%; AUC 0.87, p < 0.001); PCT demonstrated a superior predictive accuracy on POD7, with a threshold value of 0.13 μg/L (NPV 98%; AUC 0.84, p < 0.001); the NLR showed a superior predictive accuracy on POD6, with a threshold ratio of 6.77 (NPV 95%; AUC 0.86, p < 0.001); the PLR achieved a superior predictive accuracy on POD7, with a ratio of 234 (NPV 98%; AUC 0.71; p = 0.002); and fibrinogen demonstrated a superior predictive accuracy on POD5, with a threshold of 7.344 g/L (NPV 98%; AUC 0.74; p = 0.003). In the comparison of predictive accuracy, CPR, PCT, and the NLR were found to be superior to all other biomarkers.

CONCLUSIONS

CRP, PCT, and the NLR are biomarkers with a sufficient predictive ability to clinically discard the presence of AL within the first postoperative week.

Rectal stenosis after circular mechanical anastomosis; the influence of stapler size

BACKGROUND

The incidence of benign anastomotic stenosis (BAS) after radical surgery for rectal cancer ranges from 2 to 30%. There are few data regarding the factors related to its occurrence. One of these factors is the diameter of the circular mechanical staplers (CMS) used.

METHODS

Observational study with prospective data recording of consecutive patients with non-disseminated rectal cancer operated on at two hospitals with special dedication to rectal cancer. Patients underwent low anterior resection (LAR) of the rectum with colorectal anastomosis created using CMS of diameters of either 28-29 or 31-33 mm. The primary endpoint was BAS. Secondary variables were demographic and patient-dependent data, and preoperative, intraoperative, immediate postoperative and mid-term data. The incidence of BAS was compared in the groups in which the different stapler diameters were used.

RESULTS

Between 2012 and 2022, 239 patients were included. BAS was recorded in 39 (16.3%). In the analysis of factors related to its occurrence, the only significant variable was stapler diameter (p = 0.002, 95% CI 7.27-23.53), since rates of BAS were lower in the 31-33 mm group. Similarly, in the logistic regression analysis, stapler size was not associated with postoperative complications or anastomotic dehiscence (OR 3.5, 95% CI 1.2-10.5). Comparing stapler groups, BAS was detected in 35 of 165 patients (21%) in the 28-29 mm group but in only four out of 74 (5.6%) in the 31-33 mm group (p = 0.002, 95% CI 7.27-23.53). Ileostomy closure took longer and was less frequent in the 28-29 mm group.

CONCLUSIONS

The rate of BAS after LAR was not negligible, since it was recorded in 39 of 239 patients (16.3%). The use of a 31-33 mm CMS was associated with a lower incidence of BAS. Therefore, the use of larger staplers is tentatively recommended; however, clinical trials are now required to confirm these results.

Short cycles of remote ischemic preconditioning had no effect on tensile strength in small intestinal anastomoses: an experimental animal study

PURPOSE

This study aimed to investigate the effect of remote ischemic preconditioning (RIPC) on the healing of small intestinal anastomoses, evaluated by tensile strength and histologic wound healing on postoperative day 5.

METHODS

A total of 22 female pigs were randomized 1:1 into either an intervention or control group. The intervention group received 5 cycles of 3-minute ischemia followed by 3-minute reperfusion on the right forelimb. Two end-to-end anastomoses, a distal and a proximal, were created in the small intestine 30 and 60 min after RIPC, respectively. On postoperative day 5, the anastomoses were harvested and underwent a maximal anastomotic tensile strength (MATS) test (MATS 1-3) followed by histologic analyses.

RESULTS

MATS 1, when a tear became visible in the serosa, was significantly increased in the proximal anastomoses of the RIPC group compared with the control group (4.91 N vs 3.83 N; P = .005). No other significant differences were found when comparing these 2 groups.

CONCLUSION

Our study showed no convincing results of RIPC on intestinal anastomotic healing to recommend its use in a general clinical setting. Further animal studies on RIPC's effect after relative or absolute intestinal ischemia may be recommended.

Predictive Accuracy of C-reactive Protein as an Early Indicator of Leakage After Anastomosis and Primary Repair in Gastrointestinal Surgery

Background Anastomotic leakage after gastrointestinal surgery is a significant postoperative complication that leads to increased morbidity and mortality. C-reactive protein (CRP) has been used previously as a predictive marker of anastomotic leakage in gastrointestinal surgeries. Its short half-life makes it a reliable marker for postoperative complications, rapidly returning to normal values as the patient recovers. We conducted this study to evaluate the predictive accuracy of serum CRP levels in predicting anastomotic leaks in patients undergoing gastrointestinal repair surgeries. Methods Ninety-six gastrointestinal surgeries involving anastomoses and primary repairs were included in the study. CRP was taken serially from postoperative days (POD) 1 to 7. Patients were divided into two groups based on postoperative outcomes: leakage and non-leakage. The receiver operating characteristic (ROC) curve of CRP levels with leak and mortality was plotted to find a threshold value for leak and mortality. Results Out of 96 patients included in the study, Group B (non-leakage) consisted of 78 patients (81.3%), while Group A (leakage) comprised 18 patients (18.7%). ROC analysis identified a CRP cutoff of 127 mg/L on POD 5, with high sensitivity (80%) and high specificity (80%) indicating a high likelihood of leakage above this threshold. Conclusion This study underscores the importance of monitoring CRP levels in the postoperative period, particularly on POD 5, as a non-invasive and cost-effective tool for the early detection of anastomotic leaks.

Prediction of Length of Stay After Colorectal Surgery Using Intraoperative Risk Factors

Objective

The primary objective of this study was to develop a length of stay (LOS) prediction model.

Background

Predicting the LOS is crucial for patient care, planning, managing expectations, and optimizing hospital resources. Prolonged LOS after colorectal surgery is largely influenced by complications, and an accurate prediction model could significantly benefit patient outcomes and healthcare efficiency.

Methods

This study included patients who underwent colorectal surgery in 14 different hospitals between January 2016 and December 2020. Two distinct random forest models were developed: one solely based on preoperative variables (preoperative prediction model [PP model]) and the other incorporating both preoperative and intraoperative variables (intraoperative prediction model [IP model]). Both models underwent validation using 10-fold cross-validation. The discriminative power of the model was assessed using the area under the curve (AUC), and calibration was evaluated using a calibration curve. The 2 developed models were compared using DeLong test.

Results

A total of 2140 patients were included in the analysis. After internal validation, the PP model achieved an AUC of 0.75 (95% confidence interval [CI]: 0.73-0.77), and the IP model achieved an AUC of 0.84 (95% CI: 0.82-0.85). The difference in discrimination between the 2 models was statistically significant (DeLong test, P < 0.001). Both models exhibited good calibration.

Conclusions

Incorporating intraoperative parameters enhances the accuracy of the predictive model for LOS after colorectal surgery. Improving LOS prediction can assist in managing the increasing number of patients and optimizing the allocation of healthcare resources.

Quadruple Assessment of Colorectal Anastomosis after Laparoscopic Rectal Resection: A Retrospective Analysis of a Propensity-Matched Cohort

Background: Anastomotic leakage (AL) is one of the most feared complications in colorectal surgery, with an incidence of 12-39% and associated risk of mortality of 2-24%. The causes of AL and the ways to prevent it are currently under investigation. This study aims to verify if a quadruple assessment of colorectal anastomosis could reduce AL incidence. Methods: A retrospective analysis of prospectively collected data on rectal cancer surgery performed from January 2015 to December 2017 and from January 2021 to December 2023 at a tertiary referral cancer centre was performed. Demographics, clinicopathological features, short-term outcomes, recurrences, and survival were investigated. Results: A total of 293 patients were enrolled. AL incidence was lower in the quadruple assessment group than in the control group, reaching a statistically significant result (7.7% vs. 16%; p = 0.001). This result was also confirmed after a propensity score match analysis (PSM), in which the AL rate was lower in the quadruple assessment group (5.4% vs. 12.3%; p = 0.01). Conclusions: This study shows how the systematic implementation of a quadruple assessment when performing a colorectal anastomosis could increase awareness on anastomotic success and reduce the incidence of AL.

Early Detection and Monitoring of Anastomotic Leaks via Naked Eye-Readable, Non-Electronic Macromolecular Network Sensors

Anastomotic leakage (AL) is the leaking of non-sterile gastrointestinal contents into a patient's abdominal cavity. AL is one of the most dreaded complications following gastrointestinal surgery, with mortality rates reaching up to 27%. The current diagnostic methods for anastomotic leaks are limited in sensitivity and specificity. Since the timing of detection directly impacts patient outcomes, developing new, fast, and simple methods for early leak detection is crucial. Here, a naked eye-readable, electronic-free macromolecular network drain fluid sensor is introduced for continuous monitoring and early detection of AL at the patient's bedside. The sensor array comprises three different macromolecular network sensing elements, each tailored for selectivity toward the three major digestive enzymes found in the drainage fluid during a developing AL. Upon digestion of the macromolecular network structure by the respective digestive enzymes, the sensor produces an optical shift discernible to the naked eye. The diagnostic efficacy and clinical applicability of these sensors are demonstrated using clinical samples from 32 patients, yielding a Receiver Operating Characteristic Area Under the Curve (ROC AUC) of 1.0. This work has the potential to significantly contribute to improved patient outcomes through continuous monitoring and early, low-cost, and reliable AL detection.

Influence of Neoadjuvant Therapy on Success of Endoscopic Vacuum Therapy in Anastomotic Leakage after Rectal Resection Because of Rectal Cancer

Background: For locally advanced rectal cancer, neoadjuvant therapy (NT) is an established element of therapy. Endoscopic vacuum therapy (EVT) has been a relevant treatment option for anastomotic leakage after rectal resection since 2008. The aim was to evaluate the influence of NT on the duration and success of EVT in anastomotic leakage after rectal resection for rectal cancer. Methods: This was a monocentric, retrospective cohort study including patients who underwent rectal resection with primary anastomosis because of histologically proven carcinoma of the rectum in the Department for General and Visceral Surgery of Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin over a period of ten years (2012 to 2022). Results: Overall, 243 patients were included, of which 47 patients (19.3%) suffered from anastomotic leakage grade B with consecutive EVT. A total of 29 (61.7%) patients received NT and 18 patients (38.3%) did not. The median duration of EVT until the removal of the sponge did not differ between patients with and without NT: 24.0 days (95% CI 6.44-41.56) versus 20.0 days (95% CI 17.03-22.97); p = 0.273. The median duration from insertion of EVT until complete healing was 74.0 days with NT (95% CI 10.07-137.93) versus 62.0 days without NT (95% CI 45.99-78.01); p = 0.490. Treatment failure-including early persistence and late onset of recurrent anastomotic leakage-was evident in 27.6% of patients with NT versus 27.8% without NT; p = 0.989. Ostomy was reversed in 19 patients (79.2%) with NT compared to 11 patients (68.8%) without NT; p = 0.456. Overall, continuity was restored in 75% of patients in the long term after EVT. Conclusion: This trial comprised-to our knowledge-the largest study cohort to analyze the outcome of EVT in anastomotic leakage after rectal resection for rectal cancer. We conclude that neoadjuvant therapy neither prolongs EVT nor the time to healing from anastomotic leakage. The rates of treatment failure of EVT and permanent ostomy were not higher when neoadjuvant therapy was used.

An Institutional Shift from Routine to Selective Diversion of Low Anastomosis in Robotic TME Surgery for Rectal Cancer Patients Using the KHANS Technique: A Single-Centre Cohort Study

(1) Background: In recent years, there has been a change in practice for diverting stomas in rectal cancer surgery, shifting from routine diverting stomas to a more selective approach. Studies suggest that the benefits of temporary ileostomies do not live up to their risks, such as high-output stomas, stoma dysfunction, and reoperation. (2) Methods: All rectal cancer patients treated with a robotic resection in a single tertiary colorectal centre in the UK from 2013 to 2021 were analysed. In 2015, our unit made a shift to a more selective approach to temporary diverting ileostomies. The cohort was divided into a routine diversion group treated before 2015 and a selective diversion group treated after 2015. Both groups were analysed and compared for short-term outcomes and morbidities. (3) Results: In group A, 63/70 patients (90%) had a diverting stoma compared to 98/135 patients (72.6%) in group B (p = 0.004). There were no significant differences between the groups in anastomotic leakages (11.8% vs. 17.8%, p = 0.312) or other complications (p = 0.117). There were also no significant differences in readmission (3.8% vs. 2.6%, p = 0.312) or reoperation (3.8% vs. 2.6%, p = 1.000) after stoma closure. After 1 year, 71.6% and 71.9% (p = 1.000) of patients were stoma-free. One major reason for the delay in stoma reversal was the COVID-19 pandemic, which only occurred in group B (0% vs. 22%, p = 0.054). (4) Conclusions: A more selective approach to diverting stomas for robotic rectal cancer patients does not lead to more complications or leaks and can be considered in the treatment of rectal cancer tumours.

A comparison of the postoperative outcomes between intraoperative leak testing and no intraoperative leak testing for gastric cancer surgery: a systematic review and meta-analysis

BACKGROUND

Postoperative anastomotic leakage (PAL) is a serious complication of gastric cancer surgery. Although perioperative management has made considerable progress, anastomotic leakage (AL) cannot always be avoided. The purpose of this study is to evaluate whether intraoperative leak testing (IOLT) can reduce the incidence of PAL and other postoperative outcomes in gastric cancer surgery.

MATERIALS AND METHODS

In this meta-analysis, we searched the PubMed, Embase, and Cochrane Library databases for clinical trials to assess the application of IOLT in gastric cancer surgery. All patients underwent laparoscopic radical gastrectomy for gastric cancer surgery. Studies comparing the postoperative outcomes of IOLT and no intraoperative leak testing (NIOLT) were included. Quality assessment, heterogeneity, risk of bias, and the level of evidence of the included studies were evaluated. PAL, anastomotic-related complications, 30-day mortality, and reoperation rates were compared between the IOLT and NIOLT group.

RESULTS

Our literature search returned 721 results, from which six trials (a total of 1,666 patients) were included in our meta-analysis. Statistical heterogeneity was low. The primary outcome was PAL. IOLT reduced the incidence of PAL [2.09% vs 6.68%; (RR = 0.31, 95% Cl 0.19-0.53, P < 0.0001]. Anastomotic-related complications, which included bleeding, leakage, and stricture, were significantly higher in the NIOLT group than in the IOLT group [3.24% VS 10.85%; RR = 0.30, 95% Cl 0.18-0.53, P < 0.0001]. Moreover, IOLT was associated with lower reoperation rates [0.94% vs 6.83%; RR = 0.18, 95% CI 0.07-0.43, P = 0.0002].

CONCLUSION

Considering the observed lower incidence of postoperative anastomotic leakage (PAL), anastomotic-related complications, and reoperation rates, IOLT appears to be a promising option for gastric cancer surgery. It warrants further study before potential inclusion in future clinical guidelines.

Replogle Modified Endoscopic Vacuum-Assisted Closure (EVAC) Therapy: A New Strategy to Treat Anastomotic Leakage and Esophageal Perforation

BACKGROUND

Anastomotic leakage (AL) and esophageal perforation are life-threatening complications following surgery or endoscopic dilations. "Replogle modified EVAC therapy" consists of placing a Replogle tube directly into the lumen or within an abscess cavity and remove by suction all intra-cavity fluids and secretion with a continuous low-pressure suction, promoting granulation tissue proliferation, thereby gradually decreasing the cavity size. The aim of our study was to evaluate the technical feasibility, safety, and efficacy of this technique in pediatric patients.

METHODS

A retrospective review charts of consecutive pediatric patients that were treated with "Replogle modified EVAC therapy" at our pediatric referral center between 2013 and 2022 was conducted. The clinical, endoscopic, radiological, and surgical information and data of patients were collected and revised as well as their follow-up and outcomes.

RESULTS

Ten patients (6/10 male; mean age: 7.8 y.o., range: 1.1-18 y.o.) were treated using the "Replogle modified EVAC therapy". Four out of ten patients developed esophageal perforations after endoscopic procedures. Six out of the ten enrolled patients had AL complications after surgical operations. All patients were successfully treated. There were no technical failures or complications with device placement. Mean treatment duration was 16 days (range 7-41 days). No additional treatment was needed for complete leak resolution.

CONCLUSIONS

"Replogle modified EVAC therapy" represents a promising and mini-invasive method to treat esophageal perforations and post-surgical leak in the paediatric age group. In our experience, the use of this technique was safe, effective, and particularly well suited also in complex paediatric patients.

LEVEL OF EVIDENCE

IV.

Indocyanine green fluorescence angiography could reduce the risk of anastomotic leakage in rectal cancer surgery: a systematic review and meta-analysis of randomized controlled trials

AIM

Several papers have shown that use of indocyanine green (ICG) decreases incidence of anastomotic leakage (AL) during colonic surgery, but no clear evidence has been found for rectal cancer surgery. Therefore, with this systematic review and meta-analysis of randomized controlled trials (RCTs) we aimed to assess if ICG could also reduce risk of AL in rectal cancer surgery.

METHOD

PubMed, Scopus, CINAHL and Cochrane databases were searched for RCTs assessing the effect of intraoperative ICG on the incidence of AL of the colorectal anastomosis. Pooled relative risk (RR) and pooled risk difference (RD) were obtained using models with random effects. Risk of bias was evaluated with the Rob2 tool and the quality of evidence was assessed using the GRADE Pro tool.

RESULTS

Four RCTs were included for analysis, with a total of 1510 patients (743 controls and 767 ICG patients). The rate of AL was 9% in the ICG group (69/767) and 13.9% (103/743) in the control group (p = 0.003, RR -0.5, 95% CI -0.827 to -0.172, heterogeneity test 0%, p = 0.460). The RD in terms of incidence of AL was significantly decreased by 4.51% (p = 0.031, 95% CI -0.086 to -0.004, heterogeneity test 28%, p = 0.182) when using ICG.

CONCLUSION

Our meta-analysis suggested that use of ICG during rectal cancer surgery could reduce the rate of AL.

Clinical impact of very early recurrence after conversion surgery for stage IV gastric cancer

Background

The development and improved response to chemotherapy has resulted in a survival benefit of conversion surgery (CS) for advanced gastric cancer (GC). However, this benefit is limited in some cases, such as in those with very early recurrence (VER). This study investigated the relationship between outcome and clinicopathological characteristics after CS for stage IV GC, and the risk factors for VER after CS.

Methods

We retrospectively studied 184 patients with stage IV GC who initially underwent chemotherapy, including 36 patients who underwent CS between May 2007 and January 2022. We evaluated the long-term outcome after CS for stage IV GC and the clinicopathological characteristics of the patients who underwent CS.

Results

Median survival times (MSTs) in the chemotherapy alone and CS groups were 13.4 and 36.5 months, respectively (p < 0.0001). Of the 27 patients who underwent R0 resection, 22 remained free of early recurrence and five experienced VER. MSTs in the VER and free of early recurrence groups were 15.2 and 44.1 months, respectively (p < 0.0001). Significantly more patients had liver metastasis before initial treatment in the VER group than in the FER group (p = 0.016). There were more patients with preoperative PNI <40 in the VER group (p = 0.046).

Conclusion

CS is an effective treatment for stage IV GC, but VER is associated with poor prognosis. We need to carefully consider the indications for CS, especially for patients with poor nutritional status and liver metastases.

Perioperative Blood Transfusions and Anastomotic Leak After Colorectal Surgery for Cancer in an Australian Hospital

PURPOSE

Peri-operative blood transfusion has been identified as a risk factor for anastomotic leak in recent studies, but little is known about which patients are at risk for blood transfusion. This study aims to assess the relationship between blood transfusion and anastomotic leak and factors predisposing to leak in patients undergoing colorectal cancer surgery.

METHODS

This retrospective cohort study was conducted in a tertiary hospital in Brisbane, Australia, between 2010 and 2019. A total of 522 patients underwent resection of colorectal cancer with primary anastomosis with no covering stoma and the prevalence of anastomotic leak was compared between those who had had perioperative blood transfusion(s) and those who had not.

RESULTS

A total of 19 of 522 patients undergoing surgery for colorectal cancer had developed an anastomotic leak (3.64%). 11.3% of patients who had had a perioperative blood transfusion developed an anastomotic leak whereas 2.2% of patients who had not had a blood transfusion developed an anastomotic leak (p = 0.0002). Patients undergoing procedure on their right colon had proportionally more blood transfusions and this approached statistical significance (p = 0.06). Patients who received a greater quantity of units of blood transfusion prior to their diagnosis of anastomotic leak were more likely to develop an anastomotic leak (p = 0.001).

CONCLUSION

Perioperative blood transfusions are associated with a significantly increased risk of an anastomotic leak following bowel resection with primary anastomosis for colorectal cancer.

Effect of transanal drainage tube on prevention of anastomotic leakage after anterior rectal cancer surgery taking indwelling time into consideration: a systematic review and meta-analysis

Background

Placement of an indwelling transanal drainage tube (TDT) to prevent anastomotic leakage (AL) after anterior rectal cancer surgery has become a routine choice for surgeons in the recent years. However, the specific indwelling time of the TDT has not been explored. We performed this meta-analysis and considered the indwelling time a critical factor in re-analyzing the effectiveness of TDT placement in prevention of AL after anterior rectal cancer surgery.

Methods

Randomized controlled trials (RCTs) and cohort studies which evaluated the effectiveness of TDT in prevention of AL after rectal cancer surgery and considered the indwelling time of TDT were identified using a predesigned search strategy in databases up to November 2022. This meta-analysis was performed to estimate the pooled AL rates (Overall and different AL grades) and reoperation rates at different TDT indwelling times and stoma statuses.

Results

Three RCTs and 15 cohort studies including 2381 cases with TDT and 2494 cases without TDT were considered eligible for inclusion. Our meta-analysis showed that the indwelling time of TDT for ≥5-days was associated with a significant reduction (TDT vs. Non-TDT) in overall AL (OR=0.46,95% CI 0.34-0.60, p<0.01), grade A+B AL (OR=0.64, 95% CI 0.42-0.97, p=0.03), grade C AL (OR=0.35, 95% CI 0.24-0.53, p<0.01), overall reoperation rate (OR=0.36, 95%CI 0.24-0.53, p<0.01) and that in patients without a prophylactic diverting stoma (DS) (OR=0.24, 95%CI 0.14-0.41, p<0.01). There were no statistically significant differences in any of the abovementioned indicators (p>0.05) when the indwelling time of TDT was less than 5 days.

Conclusion

Extending the postoperative indwelling time of TDT to 5 days may reduce the overall AL and the need for reoperation in patients without a prophylactic DS.

Systematic review registration

https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42023407451, identifier CRD42023407451.

Clinical results after external reinforcement of colorectal anastomosis: a systematic review

OBJECTIVE

The aim of this review is to describe and assess the existing methods to cover colorectal anastomoses with biomaterials and their clinical impact in reducing anastomotic leakage (AL).

SUMMARY BACKGROUND DATA

The most serious complication in colorectal surgery is AL. Despite improvements in its diagnosis and management, AL remains an unresolved issue. To prevent its appearance and clinical consequences, different external reinforcement techniques with synthetic or biomaterials have been described.

METHODS

A systematic review search of the available literature until June 2022 was performed, looking for all literature regarding external reinforcement of colonic or colorectal anastomoses. After the review process, a classification of materials was proposed into solid and liquid materials, and an assessment of their clinical impact was performed. The study protocol has been registered at PROSPERO and has been reported in the line with PRISMA and AMSTAR Guidelines 11,12 .

RESULTS

Ninety-seven articles that fulfilled inclusion criteria, were identified and revised. Overall, 18 of the selected articles focused on human clinical trials and 79 on animal models. Only fibrin sealants, collagen patches, and omentoplasty have shown positive results in humans.

CONCLUSIONS

Fibrin sealants, collagen patches, and omentoplasty are, so far, the most studied biomaterials. However, further studies are required to confirm these findings before definite recommendations can be made.

Endoscopic management of anastomotic leakage after colorectal cancer surgery in a Moroccan center: A case series and literature review

Endoscopic management has become an alternate treatment to a revision surgery for colorectal fistulas. Eight patients who were treated by endoscopy for postoperative anastomotic leakage to colorectal cancer were included. A univariate analysis was carried out to determine the predictive factors of success. All our patients were treated using metallic clips. The primary efficiency of this technique was 50%. In a univariate analysis, the size of the fistula and its distance from the anal margin had an influence on the efficiency of the endoscopic treatment, which was not the case for either the surgical technique or the use of neoadjuvant radiotherapy. This endoscopic treatment is effective and represents a more secure alternative than revision surgery. In our study, the use of metallic clips showed a 50% success rate, going up to 100% for the group of patients with a fistula ostium of a size ⩽1 cm, proving the necessity of using this technique.

Diagnosis and management of anastomotic leaks after Ivor Lewis esophagectomy: a single-center experience

PURPOSE

Esophageal anastomotic leaks (ALs) after esophagectomy are a common and serious complication. The incidence, diagnostic approach, and management have changed over time. We described the diagnosis and management of patients who developed an esophageal AL after an Ivor Lewis esophagectomy at our center.

METHODS

After IRB approval, we queried our prospectively maintained database for patients who developed an esophageal AL after esophagectomy from August 2016 through July 2022. Data pertaining to demographics, comorbidities, surgical and oncological characteristics, and clinical course were extracted and analyzed.

RESULTS

During the study period, 145 patients underwent an Ivor Lewis esophagectomy; 10 (6.9%) developed an AL, diagnosed a median of 7.5 days after surgery, and detected by enteric contents in wound drains (n = 3), endoscopy (n = 3), CT (n = 2), and contrast esophagogram (n = 2). Nine patients (90%) had an increasing white blood cell count and additional signs of sepsis. One asymptomatic patient was identified by contrast esophagography. All patients received enteral nutritional support, intravenous antibiotics, and antifungals. Primary treatment of ALs included endoscopic placement of a self-expanding metal stent (SEMS; n = 6), surgery (n = 2), and SEMS with endoluminal vacuum therapy (n = 2). One patient required surgery after SEMS placement. The median length of ICU and total hospital stays were 11.5 and 22.5 days, respectively. There was no 30-day mortality.

CONCLUSION

The incidence of esophageal ALs at our center is similar to that of other high-volume centers. Most ALs can be managed without surgery; however, ALs remain a significant source of postoperative morbidity despite clinical advancements that have improved mortality.

Outcomes following anastomotic leak from rectal resections, including bowel function and quality of life

PURPOSE

Anastomotic leak (AL) is an uncommon but potentially devastating complication after rectal resection. We aim to provide an updated assessment of bowel function and quality of life after AL, as well as associated short- and long-term outcomes.

METHODS

A retrospective audit of all rectal resections performed at a colorectal unit and associated private hospitals over the past 10 years was performed. Relevant demographic, operative, and histopathological data were collected. A prospective survey was performed regarding patients' quality of life and fecal continence. These patients were matched with nonAL patients who completed the same survey.

RESULTS

One hundred patients (out of 1,394 resections) were included. AL was contained in 66.0%, not contained in 10.0%, and only anastomotic stricture in 24.0%. Management was antibiotics only in 39.0%, percutaneous drainage in 9.0%, operative abdominal drainage in 19.0%, transrectal drainage in 6.0%, combination of percutaneous drainage and transrectal drainage in 2.0%, and combination abdominal/transrectal drainage in 1.0%. The 1-year stoma rate was 15.0%. Overall, mean Fecal Incontinence Severity Instrument scores were higher for AL patients than their matched counterparts (8.06±10.5 vs. 2.92±4.92, P=0.002). Patients with an AL had a mean EuroQol visual analogue scale (EQ-VAS) of 76.23±19.85; this was lower than the matched mean EQ-VAS for non-AL patients of 81.64±18.07, although not statistically significant (P=0.180).

CONCLUSION

The majority of AL patients in this study were managed with antibiotics only. AL was associated with higher fecal incontinence scores in the long-term; however, this did not equate to lower quality of life scores.

Application of near-infrared fluorescence imaging in theranostics of gastrointestinal tumors

Gastrointestinal cancers have become an important cause of cancer-related death in humans. Improving the early diagnosis rate of gastrointestinal tumors and improving the effect of surgical treatment can significantly improve the survival rate of patients. The conventional diagnostic method is high-definition white-light endoscopy, which often leads to missed diagnosis. For surgical treatment, intraoperative tumor localization and post-operative anastomotic state evaluation play important roles in the effect of surgical treatment. As a new imaging method, near-infrared fluorescence imaging (NIRFI) has its unique advantages in the diagnosis and auxiliary surgical treatment of gastrointestinal tumors due to its high sensitivity and the ability to image deep tissues. In this review, we focus on the latest advances of NIRFI technology applied in early diagnosis of gastrointestinal tumors, identification of tumor margins, identification of lymph nodes, and assessment of anastomotic leakage. In addition, we summarize the advances of NIRFI systems such as macro imaging and micro imaging systems, and also clearly describe the application process of NIRFI from system to clinical application, and look into the prospect of NIRFI applied in the theranostics of gastrointestinal tumors.

Real-time quantification of bowel perfusion using Laparoscopic Laser Speckle Contrast Imaging (LSCI) in a porcine model

BACKGROUND/PURPOSE

Real-time quantification of tissue perfusion can improve intraoperative surgical decision making. Here we demonstrate the utility of Laser Speckle Contrast Imaging as an intra-operative tool that quantifies real-time regional differences in intestinal perfusion and distinguishes ischemic changes resulting from arterial/venous obstruction.

METHODS

Porcine models (n = 3) consisted of selectively devascularized small bowel loops that were used to measure the perfusion responses under conditions of control/no vascular occlusion, arterial inflow occlusion, and venous outflow occlusion using laser speckle imaging and indocyanine green fluoroscopy. Laser Speckle was also used to assess perfusion differences between small bowel antimesenteric-antimesenteric and mesenteric-mesenteric anastomoses. Perfusion quantification was measured in relative perfusion units calculated from the laser speckle perfusion heatmap.

RESULTS

Laser Speckle distinguished between visually identified perfused, watershed, and ischemic intestinal segments with both color heatmap and quantification (p < .00001). It detected a continuous gradient of relative intestinal perfusion as a function of distance from the stapled ischemic bowel edge. Strong positive linear correlation between relative perfusion units and changes in mean arterial pressure resulting from both arterial (R2 = .96/.79) and venous pressure changes (R2 = .86/.96) was observed. Furthermore, Laser Speckle showed that the antimesenteric anastomosis had a higher perfusion than mesenteric anastomosis (p < 0.01).

CONCLUSIONS

Laser Speckle Contrast Imaging provides objective, quantifiable tissue perfusion information in both color heatmap and relative numerical units. Laser Speckle can detect spatial/temporal differences in perfusion between antimesenteric and mesenteric borders of a bowel segment and precisely detect perfusion changes induced by progressive arterial/venous occlusions in real-time.

Transanal drainage tube for the prevention of anastomotic leakage after rectal cancer surgery: a meta-analysis of randomized controlled trials

Background

Anastomotic leakage (AL) is a serious complication of anterior resection for rectal cancer. The use of transanal drainage tubes (TDT) during surgery to prevent AL remains controversial. Therefore, we conducted a systematic review and meta-analysis of randomized controlled trials (RCTs) to determine the efficacy of TDT in reducing AL.

Methods

Relevant data and studies published from inception until November 1, 2022, were retrieved from PubMed, Embase, and Cochrane Library databases to compare the incidence of AL after anterior resection for rectal cancer with and without TDT.

Results

This meta-analysis included 5 RCTs comprising 1385 patients. The results showed that the intraoperative use of TDT could not reduce the incidence of AL after rectal cancer surgery (risk ratio [RR], 0.91; 95% confidence interval [CI], 0.52-1.59; p = 0.75). A subgroup analysis of different degrees of AL revealed that TDT did not reduce the incidence of postoperative grade B AL (RR, 1.18; 95% CI, 0.67-2.09; p = 0.56) but decreased the incidence of grade C AL (RR, 0.28; 95% CI: 0.12-0.64; p = 0.003). Further, TDT did not reduce the incidence of AL in patients with rectal cancer and a stoma (RR, 2.40; 95% CI, 1.01-5.71; p = 0.05).

Conclusion

TDT were ineffective in reducing the overall incidence of AL, but they might be beneficial in reducing the incidence of grade C AL in patients who underwent anterior resection. However, additional multicenter RCTs with larger sample sizes based on unified control standards and TDT indications are warranted to validate these findings.

Indocyanine green fluorescence angiography decreases the risk of anastomotic leakage after rectal cancer surgery: a systematic review and meta-analysis

Background

Anastomotic leakage is a serious complication after rectal cancer resection. Intraoperative use of indocyanine green fluorescence angiography (ICGFA) can help prevent anastomotic leakage, but its use is controversial. We conducted a systematic review and meta-analysis to determine the efficacy of ICGFA in reducing anastomotic leakage.

Methods

Relevant data and research published until September 30, 2022, was retrieved from the PubMed, Embase, and Cochrane Library databases, and the difference in the incidence of anastomotic leakage after rectal cancer resection between ICGFA and standard treatment was compared.

Results

This meta-analysis included 22 studies with a total of 4,738 patients. The results showed that ICGFA use during surgery decreased the incidence of anastomotic leakage after rectal cancer surgery [risk ratio (RR) = 0.46; 95% confidence interval (95% CI), 0.39-0.56; p < 0.001]. Simultaneously, in subgroup analyses for different regions, ICGFA was found to be used to reduce the incidence of anastomotic leakage after rectal cancer surgery in Asia (RR = 0.33; 95% CI, 0.23-0.48; p < 0.00001) and Europe (RR = 0.38; 95% CI, 0.27-0.53; p < 0.00001) but not in North America (RR = 0.72; 95% CI, 0.40-1.29; p = 0.27). Regarding different levels of anastomotic leakage, ICGFA reduced the incidence of postoperative type A anastomotic leakage (RR = 0.25; 95% CI, 0.14-0.44; p < 0.00001) but did not reduce the incidence of type B (RR = 0.70; 95% CI, 0.38-1.31; p = 0.27) and type C (RR = 0.97; 95% CI, 0.51-1.97; p = 0.93) anastomotic leakages.

Conclusion

ICGFA has been linked to a reduction in anastomotic leakage after rectal cancer resection. However, multicenter randomized controlled trials with larger sample sizes are required for further validation.

Laser tissue soldering of the gastrointestinal tract: A systematic review LTS of the gastrointestinal tract

Background

Laser Tissue Soldering (LTS) is a promising tissue bonding technique in which a solder is applied between the tissues and then irradiated by laser, causing it to solidify and form links with the tissue.

Methods

A comprehensive systematic review summarizing the state of research of LTS in the gastrointestinal tract.

Results

Most studies were conducted on large animal tissues, using liquid proteinaceous solder, and irradiated by a continuous wave laser at 808 nm. LTS can provide better sealing and burst pressure than conventional methods. The application of LTS on top of or in addition to sutures showed an impressive increase in burst pressures. LTS may decrease the inflammatory and foreign body reaction caused by sutures.

Conclusions

LTS has strong potential to be applied in a clinical setting in leak prevention and in closure of gastrointestinal structures as an adjunct or additional anastomotic technology, decreasing leak rates, morbidity, and mortality.

Anastomotic perfusion assessment with indocyanine green in robot-assisted low-anterior resection, a multicenter study of interobserver variation

BACKGROUND

Securing sufficient blood perfusion to the anastomotic area after low-anterior resection is a crucial factor in preventing anastomotic leakage (AL). Intra-operative indocyanine green fluorescent imaging (ICG-FI) has been suggested as a tool to assess perfusion. However, knowledge of inter-observer variation among surgeons in the interpretation of ICG-FI is sparse. Our primary objective was to evaluate inter-observer variation among surgeons in the interpretation of bowel blood-perfusion assessed visually by ICG-FI. Our secondary objective was to compare the results both from the visual assessment of ICG and from computer-based quantitative analyses of ICG-FI between patients with and without the development of AL.

METHOD

A multicenter study, including patients undergoing robot-assisted low anterior resection with stapled anastomosis. ICG-FI was evaluated visually by the surgeon intra-operatively. Postoperatively, recorded videos were anonymized and exchanged between centers for inter-observer evaluation. Time to visibility (TTV), time to maximum visibility (TMV), and time to wash-out (TWO) were visually assessed. In addition, the ICG-FI video-recordings were analyzed using validated pixel analysis software to quantify blood perfusion.

RESULTS

Fifty-five patients were included, and five developed clinical AL. Bland-Altman plots (BA plots) demonstrated wide inter-observer variation for visually assessed fluorescence on all parameters (TTV, TMV, and TWO). Comparing leak-group with no-leak group, we found no significant differences for TTV: Hazard Ratio; HR = 0.82 (CI 0.32; 2.08), TMV: HR = 0.62 (CI 0.24; 1.59), or TWO: HR = 1.11 (CI 0.40; 3.11). In the quantitative pixel analysis, a lower slope of the fluorescence time-curve was found in patients with a subsequent leak: median 0.08 (0.07;0.10) compared with non-leak patients: median 0.13 (0.10;0.17) (p = 0.04).

CONCLUSION

The surgeon's visual assessment of the ICG-FI demonstrated wide inter-observer variation, there were no differences between patients with and without AL. However, quantitative pixel analysis showed a significant difference between groups.

TRIAL REGISTRATION

ClinicalTrials.gov Identifier: NCT04766060.

Assessment of Colorectal Anastomosis with Intraoperative Colonoscopy: Its Role in Reducing Anastomotic Complications

The use of intraoperative colonoscopy (IOC) to evaluate the integrity of newly created anastomosis has been advocated by some surgeons. However, whether direct visualization of fresh anastomosis can help reduce anastomotic problems is still unclear. This study investigates the impact of immediate endoscopic assessment of colorectal anastomosis on anastomotic problems. This is a retrospective study conducted at a single center. Among six hundred forty-nine patients who underwent stapled anastomosis for left-sided colorectal cancer, the anastomotic complications were compared between patients who underwent IOC and those who did not. Additionally, patients with subsequent intervention after the IOC were compared to those without the intervention. Twenty-seven patients (5.0%) developed anastomotic leakage, and six (1.1%) experienced anastomotic bleeding postoperatively. Of the patients with IOC, 70 patients received reinforcement sutures to secure anastomotic stability. Of 70 patients, 39 patients showed abnormal findings in IOC. Thirty-seven patients (94.9%) who underwent reinforcement sutures did not develop postoperative anastomotic problems. This study demonstrates that IOC assessment with reinforcement sutures does not imminently reduce the rate of anastomotic complications. However, its use may play a role in detecting early technical failure and preventing postoperative anastomotic complications.

Essential updates 2020/2021: Advancing precision medicine for comprehensive rectal cancer treatment

In the paradigm shift related to rectal cancer treatment, we have to understand a variety of new emerging topics to provide appropriate treatment for individual patients as precision medicine. However, information on surgery, genomic medicine, and pharmacotherapy is highly specialized and subdivided, creating a barrier to achieving thorough knowledge. In this review, we summarize the perspective for rectal cancer treatment and management from the current standard-of-care to the latest findings to help optimize treatment strategy.

[ICG angiography in prevention of colorectal anastomotic leakage]

OBJECTIVE

To evaluate the effectiveness of indocyanine green fluorescence angiography in assessment of colorectal anastomosis perfusion.

MATERIAL AND METHODS

A prospective single-center non-randomized comparative study included 85 patients with rectum and sigmoid colon cancer between September 2019 and March 2023. In the main group (n=41), we intraoperatively injected indocyanine green (ICG) IV to assess perfusion in the near infrared spectrum. In the control group (n=44), the same interventions were performed without ICG.

RESULTS

In the main group, anterior resection of the rectum was performed in 23 (56.1%) patients with neoplasms of distal sigmoid colon and rectosigmoid tumors. Low anterior resection was performed in 18 (43.9%) cases. In the control group, the same procedures were carried out in 24 (54.5%) and 20 (45.5%) patients, respectively. After mobilization of the colon and ICG injection, we corrected resection line in 4 cases. As soon as anastomosis was formed and blood supply was controlled by ICG fluorescence angiography, we performed a water-bubble test to detect anastomotic leakage. Positive tests were detected in 4 (9.8%) and 5 (11.4%) patients of both groups, respectively. Postoperative complications occurred in 10 (24.4%) and 11 (27.3%) patients, respectively (p=0.94). Anastomosis failure was found in 1 and 7 patients, respectively. Anastomotic leakage grade «B» was significantly more common in the control group (2.4 and 13.6%, respectively, p=0.06). Anastomotic leaks were absent in all 4 patients who underwent resection level adjustment after intraoperative ICG angiography.

CONCLUSION

Fluorescent luminescence will qualitatively improve intraoperative diagnosis of hypoperfusion of resection edges. Undoubtedly, this will reduce the incidence of colorectal anastomotic leaks caused by ischemia of large bowel wall.

Use of endoluminal vacuum therapy after anastomotic leak in a gynecologic oncology patient with rectosigmoid resection: A case report

•Anastomotic leak is an infrequent complication after colon resection and is associated with high morbidity and mortality.•Endoluminal vacuum therapy (EVAT) promotes wound closure by covering anastomotic leaks intraluminally and applying vacuum.•EVAT has been shown to be safe with mild adverse events.•EVAT should be considered in hemodynamically stable gynecologic oncology patients with a confined anastomotic leak.

Early postoperative endoscopic evaluation of rectal anastomoses: a prospective cross-sectional study

BACKGROUND

Reported incidence of anastomotic leakage (AL) of rectal anastomoses is up to 29% with an overall mortality up to 12%. Nevertheless, there is no uniform evidence-based diagnostic procedure for early detection of AL. The objective of this prospective clinical trial was to demonstrate the diagnostic value of early postoperative flexible endoscopy for rectal anastomosis evaluation.

METHODS

Flexible endoscopy between 5 and 8th postoperative day was performed consecutively in 90 asymptomatic patients. Sample size calculation was made using the two-stage Simon design. Diagnostic value was measured by management change after endoscopic evaluation. Anastomoses were categorized according to a new classification. Study is registered in German Clinical Trials Register (DRKS00019217).

RESULTS

Of the 90 anastomoses, 59 (65.6%) were unsuspicious. 20 (22.2%) were suspicious with partial fibrin plaques (n = 15), intramural hematoma and/or local blood coagulum (n = 4) and ischemic area in one. 17 of these anastomoses were treated conservatively under monitoring. In three a further endoscopic re-evaluation was performed and as consequence one patient underwent endoscopic vacuum therapy. 11 (12.2%) AL were detected. Here, two could be treated conservatively under monitoring, four with endoscopic vacuum therapy and five needed revision surgery. No intervention-related adverse events occurred. A change in postoperative management was made in 31 (34.4%) patients what caused a significant improvement of diagnosis of AL (p < 0.001).

CONCLUSIONS

Early postoperative endoscopic evaluation of rectal anastomoses is a safe procedure thus allows early detection of AL. Early treatment for suspicious anastomoses or AL could be adapted to avoid severe morbidity and mortality.

Near-infrared fluorescent imaging techniques for the detection and preservation of parathyroid glands during endocrine surgery

Objectives

In over 30% of all thyroid surgeries, complications arise from transient and definitive hypoparathyroidism, underscoring the need for real-time identification and preservation of parathyroid glands (PGs). Here, we evaluate the promising intraoperative optical technologies available for the identification, preservation, and functional assessment of PGs to enhance endocrine surgery.

Methods

We performed a review of the literature to identify published studies on fluorescence imaging in thyroid and parathyroid surgery.

Results

Fluorescence imaging is a well-demonstrated approach for both in vivo and in vitro localization of specific cells or tissues, and is gaining popularity as a technique to detect PGs during endocrine surgery. Autofluorescence (AF) imaging and indocyanine green (ICG) angiography are two emerging optical techniques to improve outcomes in thyroid and parathyroid surgeries. Near-infrared-guided technology has significantly contributed to the localization of PGs, through the detection of glandular AF. Perfusion through the PGs can be visualized with ICG, which can also reveal the blood supply after dissection.

Conclusions

Near infrared AF and ICG angiography, providing a valuable spatial and anatomical information, can decrease the incidence of complications in thyroid surgery.

Minimally invasive colorectal surgery learning curve

The learning curve in minimally invasive colorectal surgery is a constant subject of discussion in the literature. Discordant data likely reflects the varying degrees of each surgeon’s experience in colorectal, laparoscopic or robotic surgery. Several factors are necessary for a successful minimally invasive colorectal surgery training program, including: Compliance with oncological outcomes; dissection along the embryological planes; constant presence of an expert tutor; periodic discussion of the morbidity and mortality rate; and creation of a dedicated, expert team.

Laparoscopic natural orifice specimen extraction, a minimally invasive surgical technique for mid-rectal cancers: Retrospective single-center analysis and single-surgeon experience of selected patients

OBJECTIVE

To evaluate the feasibility, safety, and short-term outcomes of middle rectal resection followed by transanal specimen extraction.

METHODS

Forty-four patients with small mid-rectal tumors underwent laparoscopic rectal resection followed by transanal specimen extraction.

RESULTS

The procedure was successful in all patients without intraoperative conversion or additional access. The mean operation time was 182.7 minutes (range, 130-255 minutes), the mean blood loss was 26.5 mL (range, 5-120 mL), the mean postoperative exhaust time was 31.3 hours (range, 16-60 hours), and the mean length of hospital stay was 9.5 days (range, 8-19 days). One patient developed anastomotic leakage, which was treated by intravenous antibiotics and daily pelvic cavity flushes through the abdominal drainage tube. No infection-related complications or anal incontinence were observed. The mean tumor size was 2.1 cm (range, 1.6-3.2 cm), the mean number of harvested lymph nodes was 16.5 (range, 6-31), and the mean follow-up time was 8.5 months (range, 2-16 months). By the last follow-up, no signs of recurrence had been found in any patient.

CONCLUSION

The combination of standard laparoscopic proctectomy and transanal specimen extraction could become a well-established strategy for selected patients.

Outpatient closure in a late colo-cutaneous postoperative anastomotic leak managed with EVAC in Bucaramanga, Colombia. Case report

Introduction

After Hartmann-type colostomy, the adequate selection of some patients allows reversal and closure of the colostomy, however, this reversal is not free of complications. Among complications, anastomotic leaks and fistulae can have functional, economic, and oncological consequences. Complications have been treated with surgery; yet, this management has changed considerably in recent years, moving towards less invasive therapies.

Presentation of case

This is the report of a 42-year-old man with a history of closed abdominal trauma with perforation of the sigmoid colon managed with a Hartmann-type colostomy. Six months later, he was admitted for a Hartmann reversal procedure without immediate complications. He was assessed again after 4 months observing a small area of erythema and periumbilical edema. EUS was performed without evidence of collections. Colonoscopy evidenced a 7-mm fistulous orifice in the colocolonic anastomosis. The Endo-VAC system was used, performing endoscopically exchanges twice a week following a low-residue diet. The procedure was performed on an outpatient basis and the closure of the leak hole in the colonic anastomosis was achieved in 30 days.

Discussion

Endoluminal vacuum therapy or EVAC, is an adaptation of the therapy used for negative pressure wound closure. This minimally invasive technique has been used for the treatment of gastrointestinal leaks and fistulae in selected patients and within a hospital setting. Our case presents the use of this technique in a late colocutaneous postoperative leak on an outpatient basis.

Conclusion

To the best of our knowledge we report the first case of a late colocutaneous anastomotic leak managed with EVAC on an outpatient basis.

•

Endoluminal vacuum therapy (EVAC) is an adaptation of the therapy used for negative pressure wound closure.

•

We report the first case of a late colocutaneous postoperative fistula managed with EVAC on an outpatient basis.

•

In selected patients, the EndoVac therapy can be performed using easily accessible and low-cost supplies.

[Intraoperative fluorescence-guided perfusion assessment using indocyanine green-Increased safety in gastrointestinal anastomoses?]

Insufficiency of gastrointestinal anastomoses represents a relevant risk of morbidity and mortality for affected patients. The perfusion quality of the ends of the intestine is the decisive parameter for ensuring sufficient healing of an anastomosis. Intraoperative fluorescence-guided perfusion assessment with indocyanine green is increasingly being used in modern visceral surgery to evaluate tissue perfusion prior to the fashioning of gastrointestinal anastomoses. This technique provides the possibility to distinguish between adequately and inadequately perfused tissue in order to place the anastomosis in the region with the best possible perfusion. Thus, surgeons have a measuring instrument that enables an objective assessment of the perfusion quality of the tissue to be undertaken in addition to a purely subjective macroscopic visual assessment, in order to achieve a better functional result for the patients. Currently, however, the value of this technique has not yet been conclusively clarified. The aim of this review article is to characterize the benefits of intraoperative fluorescence-guided perfusion assessment and to classify it with respect to its significance for routine clinical practice.

Predictors That Identify Complications Such As Anastomotic Leak in Colorectal Surgery: A Systematic Review

Leakage of the anastomotic site is considered to be one of the most serious complications after colon and rectal surgery. It is associated with increased mortality, morbidity, and longer hospital stays. This systematic review examines the need for blood markers such as C-reactive protein (CRP), procalcitonin (PCT), albumin, and various other molecular markers that assist in their propensity to diagnose anastomotic leakage (AL) early after surgery.

Utilizing PubMed and Google Scholar as resources and including the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines for the articles, and studies over the last five years were included. A total of 12 studies have been discussed, and most articles suggest CRP as an excellent indicator. CRP compared to Dutch leakage scores (DLS) and PCT studies suggest that the three combinations improve the predictable outcome of AL. In addition, CRP and PCT have been shown to diagnose AL early in the postoperative period. Other studies include the role of markers of oxidative stress markers, Interleukin-6, Interleukin-10, and other molecular markers in the peritoneal drain which are predictive for identifying AL after three days postoperatively (POD-3).

Overall, CRP has proven to be a reliable standard indicator of diagnosis. This is because the postoperative elevation of this protein indicates a problem of leakage with clinical symptoms. Other blood parameters are useful for diagnosis as well, but the limitations are the lack of appropriate studies and the number of randomized controlled trials in this area of ​​study.

Impact of preoperative body mass index and weight loss on morbidity and mortality following colorectal cancer-a retrospective cohort study

PURPOSE

Body weight and preoperative weight loss (WL) are controversially discussed as risk factors for postoperative morbidity and mortality in colorectal cancer surgery. The objective of this study is to determine whether body mass index (BMI) or WL is associated with a higher postoperative complication rate.

METHODS

In this retrospective cohort study, data analysis of 1241 consecutive patients undergoing colorectal cancer surgery in an 11-year period was performed. The main outcome measures were wound infections (WI), anastomotic leakages (AL), and in-house mortality.

RESULTS

A total of 697 (56%) patients with colon and 544 (44%) with rectum carcinoma underwent surgery. The rate of WI for each location increased with rising BMI. The threshold value was 28.8 kg/m2. Obese patients developed significantly more WI than normal-weight patients did following rectal resection (18.0% vs. 8.2%, p = 0.018). Patients with preoperative WL developed significantly more AL following colon resections than did patients without preoperative WL (6.2% vs. 2.5%, p = 0.046). In-house mortality was significantly higher in obese patients following colon resections than in overweight patients (4.3% vs. 0.4%, p = 0.012). Regression analysis with reference to postoperative in-house mortality revealed neither increased BMI nor WL as an independent risk factor.

CONCLUSIONS

Increased preoperative BMI is associated with a higher WI rate. AL rate after colon resection was significantly higher in patients showing preoperative WL. Preoperative BMI and WL are therefore risk factors for postoperative morbidity in this study. Nevertheless, this has to be further clarified by means of prospective studies. Trial registration DRKS00025359, 21.05.2021, retrospectively registered.

Effect of Circular Stapler Diameter on Anastomotic Leakage Rate and Stenosis After Open Total Gastrectomy With Esophagojejunostomy: A Substantive Retrospective Propensity Score Matched Series

Background

Anastomotic leakage (AL) and stenosis (AS) are two of the most severe postoperative complications after total gastrectomy with esophagojejunostomy. The stapler diameter can be chosen by the surgeon. Therefore, this study aims to assess the correlation between the stapler size as main independent variable as well as other different risk factors and AL and AS.

Methods

We conducted a retrospective analysis of data from 356 patients who underwent open total gastrectomy between 2000 and 2018, mostly due to gastric cancer (96.9%). After propensity score matching the outcome parameters AL and AS were compared between the two stapler size groups. We also assessed different risk factors for AL and AS in cancer patients using multivariate analysis.

Results

Small circular stapler diameter (21/25 mm; n = 147 vs 28/29/31 mm; n = 209) was identified as a significant risk factor for the occurrence of AL (10% vs 4% for smaller vs larger staplers; P = 0.042). In multivariate analysis for the occurrence of AL an ASA score ≥ 3 could be identified as a risk factor (OR 2.85; 95% CI = 1.13-7.15; P = 0.026). Additionally, smaller stapler size could be identified as a risk factor for AS (OR small 1.00, OR large 0.24; 95% CI: 0.06-0.97; P = 0.045). AL was associated with lower survival (18.1 vs 38.16 months; P = 0.0119).

Conclusion

The application of a larger circular stapler for esophagojejunostomy in open total gastrectomy shows significantly lower rates of AL and stenosis. Therefore, the largest possible stapler diameter should be applied.

Endoscopic vacuum therapy and early surgical closure after pelvic anastomotic leak: meta-analysis of bowel continuity rates

BACKGROUND

Endoscopic vacuum therapy (EVT) with or without early surgical closure (ESC) is considered an effective option in the management of pelvic anastomotic leakage. This meta-analysis evaluated the effectiveness of EVT in terms of stoma reversal rate and the added value of ESC.

METHODS

A systematic search of PubMed, MEDLINE, and the Cochrane Library was conducted in November 2021 to identify articles on EVT in adult patients with pelvic anastomotic leakage. The primary outcome was restored continuity rate. Following PRISMA guidelines, a meta-analysis was undertaken using a random-effects model.

RESULTS

Twenty-nine studies were included, accounting for 827 patients with leakage who underwent EVT. There was large heterogeneity between studies in design and reported outcomes, and a high risk of bias. The overall weighted mean restored continuity rate was 66.8 (95 per cent c.i. 58.8 to 73.9) per cent. In patients undergoing EVT with ESC, the calculated restored continuity rate was 82 per cent (95 per cent c.i. 50.1 to 95.4) as compared to 64.7 per cent (95 per cent c.i. 55.7 to 72.7) after EVT without ESC. The mean number of sponge exchanges was 4 (95 per cent c.i. 2.7 to 4.6) and 9.8 (95 per cent c.i. 7.3 to 12.3), respectively. Sensitivity analysis showed a restored continuity rate of 81 per cent (95 per cent c.i. 55.8 to 99.5) for benign disease, 69.0 per cent (95 per cent c.i. 57.3 to 78.7) for colorectal cancer, and 65 per cent (95 per cent c.i. 48.8 to 79.1) if neoadjuvant radiotherapy was given.

CONCLUSION

EVT is associated with satisfactory stoma reversal rates that may be improved if it is combined with ESC.

Comprehensive literature review of the outcome, modifications, and alternatives to double-stapled low pelvic colorectal anastomosis

BACKGROUND

The double-stapled technique is widely used for creation of colorectal anastomosis after anterior resection of the rectum. Anastomotic leak has been recognized as one of the serious complications of low pelvic colorectal anastomosis. The present review aimed to illustrate the collective outcome of double-stapled technique, risk factors for anastomotic leak, and the modifications and alternatives of double-stapled technique.

METHODS

A comprehensive review of PubMed/Medline, Scopus, and Web of Science was conducted to search articles that entailed patients who underwent low anterior resection with double-stapled low pelvic anastomosis. The main outcome measures were anastomotic leak and complication rates of double-stapled technique and its technical modifications.

RESULTS

Overall, the median anastomotic leak rate across 25 studies was 7.3% (range: 0.7%-24.5%). The most commonly reported predictors of anastomotic leak after double-stapled technique were low tumor location, multiple stapler firings, male sex, longer operation time, and perioperative blood transfusion. Several modifications of the double-stapled technique were described and include hand-sewn colonic J-pouch, vertical division of the rectum, transanal reinforcement of anastomosis, transanal pull-through with single stapling technique, elimination of dog-ears using sutures, the natural orifice intracorporeal anastomosis with extraction of specimen procedure, and transanal transection and single-stapled.

CONCLUSION

The median rate of anastomotic leak after double-stapled technique was less than 8%; however, it showed a wide range from less than 1% to approximately 25%. This wide variation might be related to additional risk factors of anastomotic leak, namely low tumor location and multiple stapler firings. Several techniques were described to modify the double-stapled technique to try to reduce the incidence of anastomotic leak.

Early Experience of Undertaking Robotic Assisted Total Mesorectal Excision in Rectal Resections, Avoiding a Diverting Stoma: Key eHancement of the Anastomosis for No Stoma Technique - A Case Series

Background. Anastomotic leak is a feared complication in rectal cancer surgery, and a proximal diverting stoma to protect the rectal anastomosis is used to minimize its impact. We evaluated a novel technique that uses the da Vinci® robotic platform (Intuitive Surgical) to reinforce the colorectal anastomosis and rectal staple line with sutures, and rectal resection and assessment of the anastomotic perfusion, using our Portsmouth protocol. Methods. During robotic rectal cancer surgery, we used indocyanine green to determine the level of transection and check the vascularity of the circular anastomosis. The distal transverse staple line and circular staple line of the colorectal anastomosis were reinforced with absorbable interrupted stitches (KHANS technique - Key enHancement of the Anastomosis for No Stoma). The integrity of the colorectal/anal anastomosis was also checked using the underwater air-water leak test, with concomitant flexible sigmoidoscopy to visualize the circular staple line. Results. Fifty patients underwent total mesorectal excision for cancer. Using the KHANS technique, we avoided a diverting stoma in all cases. One patient had a radiological leak, leading to a pelvic abscess. In 56% of cases, the anastomosis was within 5 cm of the anal verge. Median length of stay was 5 (3-34) days, with two 30-day readmissions. No 90-day mortality or 30-day reoperations were observed. Conclusion. The KHANS technique appears feasible, successful, and safe in decreasing the incidence of diverting stomas in rectal resections.

Remote ischemic postconditioning has a detrimental effect and remote ischemic preconditioning seems to have no effect on small intestinal anastomotic strength

BACKGROUND

The effect of remote pre- and postconditioning on anastomotic healing has been sparsely studied. The aim of our study was to investigate whether remote ischemic conditioning (RIC) applied before and after the creation of a small bowel anastomosis had an effect on anastomotic healing on postoperative day five evaluated by a tensile strength test and histological analysis.

MATERIALS AND METHODS

Twenty-two female piglets were randomized into two groups. The intervention group (n = 12) received RIC on the forelimbs consisting of 15 min of ischemia followed by 30 min of reperfusion before the first end-to-end ileal anastomosis was created. The RIC procedure was repeated and the second and more distal anastomosis was performed. The control group (n = 10) had two similar anastomoses with similar time intervals but without RIC. On postoperative day five, the anastomoses were subjected to macroscopic evaluation, tensile strength test and histological examination.

RESULTS

Mean tensile strength when the first transmural rupture appeared (MATS-2) was significantly lower in the first anastomosis in the intervention group compared to the control group (11.4 N vs 14.7 N, p < .05). Similar result was found by the maximal strength (MATS-3) as defined by a drop in the load curve (12.3 N vs 15.9 N, p < .05). Histologically, a significantly higher necrosis score was found in the anastomosis in the intervention group (1.4 vs 0.8, p < .05). No other significant differences were found.

CONCLUSIONS

In conclusion, post-anastomotic remote ischemic conditioning had a detrimental effect and pre-anastomotic conditioning seems to have no effect on small intestinal anastomotic strength.

Effect of Enteral Immunonutrition in Patients Undergoing Surgery for Gastrointestinal Cancer: An Updated Systematic Review and Meta-Analysis

Background

The efficacy of enteral immunonutrition (EIN) in patients undergoing gastrointestinal cancer surgery remains debatable. This meta-analysis aimed to investigate the effectiveness of EIN administration in patients undergoing surgery for gastrointestinal cancer.

Methods

From January 2000 to January 2022, PubMed, EMBASE, Cochrane Library, and Web of Science were thoroughly searched for randomized controlled trials (RCTs) with EIN versus standard diet or no supplement in patients undergoing surgery for gastrointestinal cancer. Overall complications and infectious complications were the primary outcomes. The secondary results were non-infectious complications, mortality, length of hospital stay, and enteral nutrition-related complications.

Results

Thirty-five studies reporting 3,692 patients undergoing surgery for gastrointestinal cancer (including gastric cancer, colorectal cancer, esophageal cancer, periampullary cancer, or pancreatic cancer) were included. Compared with the control group, EIN group had a significantly decreased incidence of overall complications (RR = 0.79, p < 0.001). Infectious complications in patients who received EIN were considerably lower than in the control group (RR = 0.66, p < 0.001). Compared to the control group, the incidence of surgical site infection, abdominal abscess, anastomotic leakage, bacteremia, duration of systemic inflammatory response syndrome (SIRS), and duration of antibiotic therapy was significantly lower in the specific infectious complications treated with EIN. Still, there was no significant difference between the two groups with other infectious complications. Moreover, a substantial shortening in the length of hospital stay was shown in EIN group compared with the control group. Still, no significant effect of EIN was demonstrated in non-infectious complicatios and mortality. The enteral nutrition-related complications had no significant difference between two groups.

Conclusions

EIN is safe and effective in reducing overall complications, infectious complications, and hospital stay in patients undergoing gastrointestinal cancer surgery (including gastric cancer, colorectal cancer, esophageal cancer, periampullary cancer, or pancreatic cancer).

The impact of multiple firings on the risk of anastomotic leakage after minimally invasive restorative rectal cancer resection and the impact of anastomotic leakage on long-term survival: a population-based study

PURPOSE

The aim of this study was to evaluate the anastomotic leakage (AL) rate and predictors for AL following minimally invasive restorative rectal resection (RRR) among rectal cancer patients managed according to up-to-date standardized treatment. Furthermore, we explored the impact of symptomatic AL on long-term survival.

METHODS

The study cohort was rectal cancer patients undergoing minimally invasive RRR in Central Denmark Region between 2013 and 2017. Data was retrieved from a prospective clinical quality database and supplemented with data from medical records. The AL rate was calculated as the proportion of patients who developed symptomatic AL within 30 days. Predictors for AL were identified through logistic regression. The impact of AL on long-term survival was analyzed using Kaplan-Meier methods and Cox regression.

RESULTS

AL occurred in 15.1% of 604 patients. The AL rate for males was 20.1% (95% CI 16.3-24.3) and 5.0% (95% CI 2.4-9.0) for females. Odds ratio (OR) of AL in females vs. males was 0.25 (95% CI 0.12-0.51). The use of at least three firings when transecting the rectum was associated with OR of 2.71 (95% CI 1.17-6.26) for AL. The 5-year survival for patients with vs. those without AL was 76.1% (95%CI 65.1-84.0) and 83.6% (95%CI 79.8-86.7), corresponding to adjusted hazard ratio of 1.43 (95%CI 0.84-2.41).

CONCLUSION

Symptomatic AL is still a challenge in a standardized setting using minimally invasive surgery in rectal cancer patients undergoing RRR, especially in men. Multiple firings should be avoided in transection of the rectum with an endoscopic stapler. AL had a statistical non-significant negative impact on survival.

Risk factors and economic burden of postoperative anastomotic leakage related events in patients who underwent surgeries for colorectal cancer

BACKGROUND

Nationwide research about the clinical and economic burden caused by anastomotic leakage (AL) has not been published yet in Korea. This study assessed the AL rate and quantified the economic burden using the nationwide database.

METHODS

This real world evidence study used health claims data provided by the Korean Health Insurance Review and Assessment Service (HIRA, which showed that 156,545 patients underwent anterior resection (AR), low anterior resection (LAR), or ultra-low anterior resection (uLAR) for colorectal cancer (CRC) between January 1, 2007 and January 31, 2020. The incidence of AL was identified using a composite operational definition, a composite of imaging study, antibacterial drug use, reoperation, or image-guided percutaneous drainage. Total hospital costs and length of stay (LOS) were evaluated in patients with AL versus those without AL during index hospitalization and within 30 days after the surgery.

RESULTS

Among 120,245 patients who met the eligibility criteria, 7,194 (5.98%) patients had AL within 30 days after surgery. Male gender, comorbidities (diabetes, metastatic disease, ischemic heart disease, ischemic stroke), protective ostomy, and multiple linear stapler use, blood transfusion, and urinary tract injury were associated with the higher odds of AL. Older age, rectosigmoid junction cancer, AR, LAR, and laparoscopic approach were related with the reduced odds of AL. Patients with AL incurred higher costs for index hospitalization compared to those without AL (8,991 vs. 7,153 USD; p<0.0001). Patients with AL also required longer LOS (16.78 vs. 14.22 days; p<0.0001) and readmissions (20.83 vs. 13.93 days; p<0.0001).

CONCLUSION

Among patients requiring resection for CRC, the occurrence of AL was associated with significantly increased costs and LOS. Preventing AL could not only produce superior clinical outcomes, but also reduce the economic burden for patients and payers.

"Relaparoscopy" to treat early complications following colorectal surgery

BACKGROUND

Laparoscopic surgery has shown clear benefits that could also be useful in the emergency setting such as early reoperations after colorectal surgery. The aim of this study was to evaluate the safety and feasibility of laparoscopic reintervention ("relaparoscopy") (RL) to manage postoperative complications after laparoscopic colorectal surgery.

METHODS

We performed a retrospective study based on a prospectively collected database from 2000 to 2019. Patients who required a reoperation after undergoing laparoscopic colorectal surgery were included. According to the approach used at the reoperation, the cohort was divided in laparoscopy (RL) and laparotomy (LPM). Demographics, hospital stay, morbidity, and mortality were analyzed.

RESULTS

A total of 159 patients underwent a reoperation after a laparoscopic colorectal surgery: 124 (78%) had RL and 35 (22%) LPM. Demographics were similar in both groups. Patients who underwent left colectomy were more frequently reoperated by laparoscopy (RL: 42.7% vs. LPM: 22.8%, p: 0.03). The most common finding at the reoperation was anastomotic leakage, which was treated more often by RL (RL: 67.7% vs. LPM: 25.7%, p: 0.0001), and the most common strategy was drainage and loop ileostomy (RL: 65.8% vs. LPM: 17.6%, p: 0.00001). Conversion was necessary in 12 patients (9.6%). Overall morbidity rate was 52.2%. Patients in the RL group had less postoperative severe complications (RL: 12.1% vs. LPM: 22.8, p: 0.01). Mortality rate was similar in both groups.

CONCLUSION

Relaparoscopy is feasible and safe for treating early postoperative complications, particularly anastomotic leakage after left colectomy.