Factors determining delay in relaparotomy for anastomotic leakage after colorectal resection

AIM： To analyze the time interval （‘delay＇） between the first occurrence of clinical parameters associated with anastomotic leakage alter colorectal resection and subsequent relaparotomy. METHODS： In 36 out of 289 consecutive patients with colorectal anastomosis, leakage was confirmed at relaparotomy. The medical records of these patients were retrospectively analysed and type and time of appearance of clinical parameters suggestive of anastomotic leakage were recorded. These parameters included heart rate, body temperature, local or generalized peritoneal reaction, leucocytosis, ileus and delayed gastric emptying. Factors influencing delay of relaparotomy and consequences of delayed recognition and treatment were determined.
RESULTS： First documentation of at least one of the predefined parameters for anastomotic leakage was alter a median interval of 4 ± 1.7 d alter the operation. The median number of days between first parameter（s） associated with leakage and relaparotomy was 3.5 ± 5.7 d. The time interval between the first signs of leakage and relaparotomy was significantly longer when a weekend was included （4.2 d vs 2.4 d, P = 0.021） or radiological evaluation proved to be false-negative （8.1 d vs 3.5 d, P = 0.007）. No significant association between delay and number of additional relaparotomies, hospital stay or mortality could be demonstrated.
CONCLUSION： An intervening weekend and negative diagnostic imaging reports may contribute to a delay in diagnosis and relaparotomy for anastomotic leakage. That delay was more than two days in two-thirds of the patients.     

结直肠癌术后吻合口瘘的诊治及预防

结直肠癌是消化道常见的恶性肿瘤,其发病率及死亡率逐年升高,手术治疗是目前治疗结直肠癌最有效的方法,但术后吻合口瘘依然是结直肠癌患者最常见、最严重的并发症之一。笔者对国内外关于结直肠癌术后吻合口瘘的研究做相关综述,以期能降低吻合口瘘的发生率。     

结直肠癌术后吻合口漏的危险因素分析与预防

结直肠癌术后吻合口漏是其术后常见的并发症之一,本文对近年来有关结直肠癌术后吻合口漏相关危险因素进行综述并对其中导致吻合口漏的多种因素进行评价,以期综合分析吻合口漏的危险因素,并采取有效预防措施,对减少吻合口漏的发生具有重要意义.     

直肠癌术后吻合口漏的风险因素评估

目的对直肠前切除术后发生吻合口漏风险进行评估。 方法选取2005年3月至2009年8月在第二军医大学附属长征医院普外科接受直肠前切除的338名直肠癌患者为研究对象,所有患者均接受直肠全系膜切除,评估相关因素与吻合口漏的相关性。 结果本研究的吻合口漏发生率为9.2%。通过单因素分析与多因素分析法发现年龄（OR：3.380,95%CI：1.346~8.489）、BMI（OR：11.828,95%CI：4.123~33.858）、肿瘤位置（OR：6.304,95%CI：162~18.382）、肠梗阻（OR：6.675,95%CI：2.164~20.594）是影响吻合口漏的独立因素。 结论直肠前切除术后发生吻合口漏与患者的性别、年龄、BMI指数、肿瘤位置、肠梗阻等因素相关。对于男性、高龄、肥胖、低位直肠癌、合并肠梗阻等危险因素的患者而言,术后发生吻合口漏的风险将增高。     

Endoluminal vacuum-assisted therapy as a treatment for anastomotic leakage in colorectal surgery

Anastomotic leakage (AL) has a wide range of clinical features ranging from radiological only findings to peritonitis and sepsis with multiorgan failure. An early diagnosis of AL is essential in order to establish the most appropriate treatment for this complication. Despite AL continues to be a dreadful compli-cation after colorectal surgery, there has been no consensus on its management. However, based on patient’s presentation and timing of the AL, there has been a gradual shift to a more conservative management, keeping surgery as the last option Reoperation for sepsis control is rarely necessary especially in those patients who already have a diverting stoma at the time of the leak. A nonoperative management is usually preferred in these patients. There are several treatment options, also for patients without a stoma who do not require a reoperation for a contained pelvic leak, including recently developed endoscopic procedures, such as clip placement or endoluminal vacuum-assisted therapy. More conservative treatments could be an option in patients who are clinically stable or in presence of a small defect.     

Can intraluminal devices prevent or reduce colorectal anastomotic leakage: a review

Colorectal anastomotic leakage is a serious complication of colorectal surgery, leading to high morbidity and mortality rates. In recent decades, many strategies aimed at lowering the incidence of anastomotic leakage have been examined. The focus of this review will be on mechanical aids protecting the colonic anastomosis against leakage. A literature search was performed using MEDLINE, EMBASE, and The Cochrane Collaborative library for all papers related to prevention of anastomotic leakage by placement of...     

Predictive factors for anastomotic leakage after laparoscopic colorectal surgery

Every colorectal surgeon during his or her career is faced with anastomotic leakage(AL); one of the most dreaded complications following any type of gastrointestinal anastomosis due to increased risk of morbidity, mortality, overall impact on functional and oncologic outcome and drainage on hospital resources. In order to understand and give an overview of the AL risk factors in laparoscopic colorectal surgery, we carried out a careful review of the existing literature on this topic and found several different definitions of AL which leads us to believe that the lack of a consensual, standard definition can partly explain the considerable variations in reported rates of AL in clinical studies. Colorectal leak rates have been found to vary depending on the anatomic location of the anastomosis with reported incidence rates ranging from 0 to 20%, while the laparoscopic approach to colorectal resections has not yet been associated with a significant reduction in AL incidence. As well, numerous risk factors, though identified, lack unanimous recognition amongst researchers. For example, the majority of papers describe the risk factors for left-sided anastomosis, the principal risk being male sex and lower anastomosis, while little data exists defining AL risk factors in a right colectomy. Also, gut microbioma is gaining an emerging role as potential risk factor for leakage.     

Surgeons lack predictive accuracy for anastomotic leakage in gastrointestinal surgery

Background  The dramatic clinical consequences of anastomotic leakage in gastrointestinal surgery can be reduced by a diverting stoma or drainage of the peri-anastomotic area. Currently, the surgeons’ clinical judgement is of major importance in decision making, but reliable data of the diagnostic accuracy are lacking. In this prospective clinical study, the surgeons’ predictive accuracy for anastomotic leakage was evaluated. Materials and methods  In 191 patients undergoing colorectal resection with anastomosis, the risk for anastomotic leakage was determined by the surgeon on the basis of a visual analogue scale (VAS). This risk assessment was compared to the actual occurrence of anastomotic leakage post-operatively. Results  A total of 26 (13.6%) patients showed anastomotic leakage. The surgeons’ median predicted leakage rate was 7.1% in anastomoses >15 cm from the anal verge and 9.5% ≤15 cm (sensitivity 38/62%, specificity 46/52%). Diagnostic accuracy was not influenced by the surgeons’ training level (VAS score, surgeons 7.8% vs assistant surgeons 8.5%, p = 0.96, sensitivity 41% vs 44%, specificity 59% vs 48%, p = 0.20). Conclusion  The surgeons’ clinical risk assessment appeared to have a low predictive value for anastomotic leakage in gastrointestinal surgery. The low a priori risk of anastomotic leakage of 14% resulted in a low post-test odds (11%) of correct prediction of anastomotic leakage. This warrants the ongoing search for a better diagnostic test of anastomotic leakage to prevent morbidity and mortality.     

Bile leakage test in liver resection: A systematic review and meta-analysis

AIM:To assess systematically the safety and efficacy of bile leakage test in liver resection.METHODS:Randomized controlled trials and controlled clinical trials involving the bile leakage test were included in a systematic literature search.Two authors independently assessed the studies for inclusion and extracted the data.A meta-analysis was conducted to estimate postoperative bile leakage,intraoperative positive bile leakage,and complications.We used either the fixed-effects or random-effects model.RESULTS:Eight studies involving a total of 1253 patients were included and they all involved the bile leakage test in liver resection.The bile leakage test group was associated with a significant reduction in bile leakage compared with the non-bile leakage test group(RR=0.39,95%CI:0.23-0.67;I2=3%).The white test had superiority for detection of intraoperative bile leakage compared with the saline solution test(RR=2.38,95%CI:1.24-4.56,P=0.009).No significant intergroup differences were observed in total number of complications,ileus,liver failure,intraperitoneal hemorrhage,pulmonary disorder,abdominal infection,and wound infection.CONCLUSION:The bile leakage test reduced postoperative bile leakage and did not increase incidence of complications.Fat emulsion is the best choice of solution for the test.     

Integrated approach to colorectal anastomotic leakage: Communication,infection and healing disturbances

Colorectal anastomotic leakage(CAL) remains a major complication after colorectal surgery. Despite all efforts during the last decades, the incidence of CAL has not decreased. In this review, we summarize the available strategies regarding prevention, prediction and intervention of CAL and categorize them into three categories: communication, infection and healing disturbances. These three major factors actively interact during the onset of CAL. We aim to provide an integrated approach to CAL based on its etiology. The intraoperative air leak test, intraoperative endoscopy, radiological examinations and stoma construction mainly aim to detect and to prevent communication between the intra- and extra-luminal content. Other strategies including postoperative drainage, antibiotics, and infectious-parameter evaluation are intended to detect and prevent anastomotic or peritoneal infection. Most currently available interventions for CAL focus on the control of communication and infection, while strategies targeting the healing disturbances such as lifestyle changes, oxygen therapy and evaluation of metabolic biomarkers still lack wide clinical application. This simplified categorization may contribute to an integrated understanding of CAL. We strongly believe that this integrated approach should be taken into consideration during clinical practice. An integrated approach to CAL could contribute to a better understanding of the etiology of CAL and eventually better patient outcome.     

Systemic coagulation activation and anastomotic leakage after colorectal cancer surgery

PURPOSE: The aim of the present study was to study whether patients developing anastomotic leakage after colorectal resections for colorectal cancer have laboratory signs of an altered hemostatic balance in the systemic circulation, preoperatively and postoperatively, causing an impaired healing process. METHODS: Patients operated on for colorectal cancer were studied. Seventeen consecutive patients with anastomotic leakage and 17 patients without anastomotic leakage were matched according to age, gender, tumor stage, and localization of tumor. Hemostatic balance was estimated preoperatively and at one, two, and seven days and at three months after surgery by plasma levels of sensitive markers of coagulation activation and fibrinolysis,i.e., prothrombin fragment 1+2, thrombin-antithrombin complexes, soluble fibrin, tissue-type plasminogen activator activity, and plasminogen activator inhibitor Type 1. RESULTS: Preoperatively, the hemostatic balance was comparable in patients with and without anastomotic leakage. In the early postoperative period, patients developing anastomotic leakage exhibited signs of systemic coagulation activation,i.e., elevated plasma levels of prothrombin fragment 1+2, thrombin-antithrombin complexes, soluble fibrin, and plasminogen activator inhibitor Type 1. The observed coagulation activation appeared before the anastomotic leakage became clinically evident. More patients with anastomotic leakage received perioperative blood transfusions than patients without leakage, despite the fact that duration of surgery and intraoperative blood loss were comparable in the two groups. CONCLUSIONS: Enhanced coagulation activity was observed postoperatively in patients developing anastomotic leakage after colorectal resections for colorectal cancer. Such a hypercoagulable state may contribute to the development of anastomotic leakage by facilitating formation of microthromboses in the perianastomotic area.This study was supported in part by grants from the Danish Cancer Society and Aalborg Stifts Juleotteri.This study was presented in part at the scientific meeting of the Danish Society of Surgery, Herlev, Denmark, April 17, 1998. No reprints are available.     

Statins use and the prognosis of colorectal cancer: a meta-analysis

BackgroundPrevious observational studies regarding the prognostic value of statin on colorectal cancer (CRC) patients showed various results.MethodsArticles regarding the prognostic value of statin on CRC and published in English and before October 2020 were searched in the following databases: PubMed, Web of Science, EMBASE, Medline and Google Scholar. The multivariate hazard ratios (HRs) and their 95% confidence intervals (CI) were computed to explore associations between statins use and overall mortality or cancer-specific mortality of CRC.ResultsThe study included 5 retrospective case-control studies (including 475 statins users and 1925 no-statin users) and 11 prospective cohort studies (including 40659 statins users and 344459 no-statin users). The present study showed that statins use might be significantly associated with lower overall mortality in CRC with a random effects model (HR = 0.81, 95% CI 0.76 to 0.86, I² = 61.9%, p value for Q test <0.001). In addition, statins use might be significantly associated with lower cancer-specific mortality in CRC with a random effects model (HR = 0.78, 95% CI 0.72 to 0.85, I² = 57.3%, p value for Q test = 0.007).ConclusionsIn conclusion, the present study indicated that that statin use was a protective factor for CRC prognosis. However, the relationship between statins use and CRC prognosis requires repeated and large prospective studies to be verified.     

Radiofrequency ablation vs hepatic resection for solitary colorectal liver metastasis: a meta-analysis

AIM:To evaluate the comparative therapeutic efficacy of radiofrequency ablation (RFA) and hepatic resection (HR) for solitary colorectal liver metastases (CLM).METHODS:A literature search was performed to identify comparative studies reporting outcomes for both RFA and HR for solitary CLM.Pooled odds ratios (OR) with 95% confidence intervals (95% CI) were calculated using either the fixed effects model or random effects model.RESULTS:Seven nonrandomized controlled trials studies were included in this analys...     

直肠癌前切除术后吻合口漏的危险因素

吻合口博(anastomotic leakage,AL)是直肠癌前切除术后常见并发症之一,使术后病死率、肿瘤局部复发率提高,降低长期生存率,并使肛管直肠功能长期受损,增加患者痛苦,增加治疗费用,延长住院时间.因而加深对AL危险因素认识,具有重要临床意义.     

Mediastinal microdialysis: early diagnosis of anastomotic leakage after resection for esophageal cancer

The aim of the present study was to evaluate the safety of mediastinal microdialysis and its efficacy regarding the early diagnosis of anastomotic leakage after gastroesophageal resection for esophageal cancer. Eight consecutive patients were included; one patient was excluded for reasons of catheter malfunction. The tip of the mediastinal microdialysis catheter was placed close to the anastomosis and held by a 4-0 absorbable suture. A subcutaneous microdialysis catheter placed in the pectoral region served as a reference. Samples collected every 4 h in the first 8 postoperative days were analyzed for lactate, glucose, pyruvate, and glycerol and the lactate/pyruvate ratio (L/P ratio) was calculated. There were no procedure-related complications. Six patients had an uncomplicated postoperative course. In one patient, the L/P ratio was within normal range during the first 20 h postoperatively, but a steady and significant increase in L/P ratio then occurred, reaching a maximum of 105 after 124 h. The patient developed leakage symptoms on day 3, but endoscopy was unable to demonstrate any leakage. On the sixth postoperative day, blue dye administered through the nasogastric tube was recovered in the pleural drain. The leakage was treated with a covered selfexpanding metal stent; an immediate and significant drop in the L/P ratio occurred. Mediastinal microdialysis seems to be a safe and promising tool in the early diagnosis of anastomotic leakage in patients undergoing gastroesophageal resection for cancer.     

Single-layer polypropylene colorectal anastomosis experience with 100 cases

The technique of single-layer continuous polypropylene colorectal anastomosis is described. The authors' experience with their initial 100 cases is analyzed in detail. No clinical leaks or anastomotic strictures were noted in a two-year follow-up period. The technique is safe, easily learned, rapidly performed, and it does not add significantly to the cost of medical care. The authors' total experience with this anastomosis now exceeds 350 cases. Read at the meeting of the American Society of Colon and Rectal Surgeons, Colorado Springs, Colorado, June 7 to 11, 1981.     

直肠癌术后吻合口漏危险因素的研究现状

吻合口漏是直肠癌术后严重的并发症之一,增加患者术后死亡率及其他并发症的发生率。近年来有大量研究探讨吻合口漏的危险因素,然而某些结果尚存在争议,本研究针对直肠癌术后吻合口漏的危险因素进行综述。     

Calcium supplementation for the prevention of colorectal adenomas: a systematic review and meta-analysis of randomized controlled trials

AIM: To determine the efficacy of calcium supplementation in reducing the recurrence of colorectal adenomas.METHODS: We conducted a systematic review and meta-analysis of published studies. We searched Pub Med, Scopus, the Cochrane Library, the WHO International Clinical Trials Registry Platform, and the Clinical Trials.gov website, through December 2015. Randomized, placebo-controlled trials assessing supplemental calcium intake for the prevention of recurrence of adenomas were eligible for inclusion. Two reviewers independently selected studies based on predefined criteria, extracted data and outcomes(recurrence of colorectal adenomas, and advanced or "high-risk" adenomas), and rated each trial's riskof-bias. Between-study heterogeneity was assessed, and pooled risk ratio(RR) estimates with their 95% confidence intervals(95%CI) were calculated using fixed- and random-effects models. To express the treatment effect in clinical terms, we calculated the number needed to treat(NNT) to prevent one adenoma recurrence. We also assessed the quality of evidence using GRADE.RESULTS: Four randomized, placebo-controlled trials met the eligibility criteria and were included. Daily doses of elemental calcium ranged from 1200 to 2000 mg, while the duration of treatment and follow-up of participants ranged from 36 to 60 mo. Synthesis of intention-to-treat data, for participants who had undergone follow-up colonoscopies, indicated a modest protective effect of calcium in prevention of adenomas(fixed-effects, RR = 0.89, 95%CI: 0.82-0.96; randomeffects, RR = 0.87, 95%CI: 0.77-0.98; high quality of evidence). The NNT was 20(95%CI: 12-61) to prevent one colorectal adenoma recurrence within a period of 3 to 5 years. On the other hand, the association between calcium treatment and advanced adenomas did not reach statistical significance(fixed-effects, RR = 0.92, 95%CI: 0.75-1.13; random-effects, RR = 0.92, 95%CI: 0.71-1.18; moderate quality of evidence). CONCLUSION: Our results suggest a modest chemopreventive effect of calcium supplements against recurrent colorectal adenomas over a period of 36 to 60 mo. Further research is warranted.