Bowel dysfunction after anastomotic leakage in laparoscopic sphincter-saving operative intervention for rectal cancer: A case-matched study in 46 patients using the Low Anterior Resection Score

Score assessment and treatment in patients presenting with low anterior resection syndrome after sphincter-sparing rectal cancer surgery

BACKGROUND

Sphincter-sparing low anterior resection (SSLAR) with neoadjuvant radio-chemotherapy has been developed to avoid abdomino-perineal amputation and permanent colostomy in patients with low rectal cancer. However, many patients develop symptoms known as low anterior resection syndrome (LARS), including fecal urgency, incontinence, and a sensation of incomplete evacuation. The Low Anterior Resection Syndrome Score (LARS Score), a validated tool developed by Emmertsen and Laurberg, is used to assess symptom severity and guide treatment.

MATERIALS AND METHODS

We present a single-center cohort study including patients having undergone SSLAR for rectal cancer between 2014 and 2021 at Fribourg Cantonal Hospital. Initial LARS-scores were obtained by completion of the QoL questionnaire. Patients with minor LARS (scores 21-29) were treated with electrostimulation and bio-feedback physiotherapy. Those with major LARS (scores > 29) were first investigated by anal manometry followed by physiotherapy. All treatments took place in 2022/2023. After treatment, LARS-scores were calculated again.

RESULTS

Of 54 patients included in the study, 18.5% had minor LARS, 40.8% major LARS, and 40.8% had no LARS. Of all patients with LARS, 18 (56%) completed pelvic physiotherapy, whereas 14 (44%) refused the treatment. Before and after pelvic physiotherapy, the median LARS score was 32 [interquartile range 29.50-38.50] and 22.5 [18.5-28], respectively (p < 0.001 according to Wilcoxon signed-rank test). Analysis of risk factors did not reveal any significant difference in age, gender, diabetes, nicotine or alcohol use, previous abdominal surgery, tumor stage, chemo/radiotherapy, type of operation and anastomosis, or anastomotic leakage.

CONCLUSIONS

Approximately half of patients undergoing SSLAR experience LARS, and approximately one-third develop the major form. LARS scores may significantly improve with specific physiotherapeutic measures that have therefore been introduced as a standard procedure for all SSLAR patients at our institution.

Development of a machine learning-based tension measurement method in robotic surgery

BACKGROUND

Over 300,000 colorectal surgeries are performed annually in the U.S. with up to 10% complicated by anastomotic leaks, which cause significant morbidity and mortality. Despite its significant association with anastomotic leaks, tension is predominantly assessed intraoperatively using subjective metrics. This study aims to assess the feasibility of a novel objective method to assess mechanical tension in ex vivo porcine colons.

METHODS

This research was conducted using the da Vinci Research Kit (dVRK). First, a machine learning algorithm based on a long short-term memory neural network was developed to estimate the pulling forces on robotic arms of dVRK. Next, two robotic arms were used to apply upward forces to five ex vivo porcine colon segments. A force sensor was placed underneath the colons to measure ground-truth forces, which were compared to estimated forces calculated by the machine learning algorithm. Root mean square error and Spearman's Correlation were calculated to evaluate force estimation accuracy and correlation between measured and estimated forces, respectively.

RESULTS

Measured forces ranged from 0 to 17.2 N for an average experiment duration of two minutes. The algorithm's force estimates closely tracked the ground-truth sensor measurements with an accuracy of up to 88% and an average accuracy of 74% across all experiments. The estimated and measured forces showed a very strong correlation, with no Spearman's Correlation less than 0.80 across all experiments.

CONCLUSION

This study proposes a machine learning algorithm that estimates colonic tension with a close approximation to ground-truth data from a force sensor. This is the first study to objectively measure tissue tension (and report it in Newtons) using a robot. Our method can be adapted to measure tension on multiple types of tissue and can help prevent surgical complications and mortality.

ETAD: a case series of endoscopic transanastomotic drainage of anastomotic leak by colonoscopy

BACKGROUND

Transanal drain placement is the preferred treatment for coloanal and low colorectal anastomotic leaks (AL). Endoscopic placement of double-pigtail stents (DPS) has been described sparingly in the colorectal literature for more proximal AL. Our objective was to investigate the efficacy of endoscopic transanastomotic drain (ETAD) placement in leaks after colorectal surgery.

METHODS

This is a case series of 12 patients who underwent ETAD placement for AL (12 patients) between May 2020 and July 2023. Patients with contained leaks were treated with ETAD if they were hemodynamically stable without peritonitis. Outcomes we evaluated included length of stay, need for readmission, need for reoperation, duration of drain placement, and reversal of diverting stomas.

RESULTS

Of the 12 patients, 5 were female and had a median age of 63. Indications for index surgery included diverticulitis (n = 9), inflammatory bowel disease (n = 1), rectal cancer (n = 1), and uncertain diagnosis (n = 1). 5 patients had stomas created (loop ileostomies,) at the index operation. Leaks were identified a median of 80 days (range 9-211) for diverted patients and a median of 15 days (range 5-18) for non-diverted patients. At the time of ETAD, three patients required readmission, four patients remained admitted from index operation, and five patients were treated as outpatients. All diverting loop ileostomies were reversed. The median duration of ETAD was 55 days (range 38-115 days). All were successfully managed with ETAD; no patients required revision of their anastomoses or new diverting stoma.

CONCLUSIONS

Endoscopic DPS placement into contained colorectal leaks was successful in promoting healing and avoiding reoperation in 100% of our patients. All ostomies but one have been reversed. Larger studies are necessary to evaluate safety and efficacy, long-term outcomes, and the appropriate patient population for consideration.

Laparoscopic approach for rectal cancer surgery: triumph of reason or necessity of evolution?

The role of laparoscopy in rectal cancer surgery has evolved considerably since the early 2000s. Initial randomized trials, such as COLOR II and COREAN, indicated that laparoscopic approaches offered similar pathological outcomes with better postoperative recovery than open surgery. In contrast, trials like ACOSOG Z6051 and ALaCaRT suggested noninferiority could not be established. Variability in trial outcomes, focusing on either disease-free survival or pathological measures, initially hindered consensus. Long-term analyses have shown no significant difference in disease-free survival between laparoscopic and open approaches. Meta-analyses have reinforced the benefits of laparoscopic surgery, with reduced mortality and similar oncologic effectiveness to open surgery. However, new techniques like transanal TME (TaTME) and robotic approaches have introduced alternatives, though each presents unique challenges, from recurrence rates in TaTME to costs in robotics. While laparoscopy remains the preferred method due to accessibility and outcomes, robotic surgery is expected to gain traction in high-volume centers.

Is the use of a transanal drainage tube effective in treating anastomotic leakage for mid-low rectal cancer

BACKGROUND

Anastomotic leakage (AL) is a severe surgical complication for mid-low rectal cancers. The efficacy of transanal drainage tube (TDT) has rarely been reported.

AIM

To evaluate the efficacy of TDT after AL.

METHODS

A retrospective analysis was conducted on 68 patients with mid-low rectal cancer who underwent laparoscopic low anterior resection (LAR) and developed ALs. Leakage were identified using imaging studies and digital rectal examinations when local abscesses or systemic infections were present. In each patient, the leakage site was determined using the index finger and a drainage tube was inserted transanally to drain the abscesses and exudates outside the anus. The clinical outcomes of the patients following transanal drainage were analyzed.

RESULTS

A total of 43 patients received TDT treatment, while 25 patients did not receive TDT treatment. Among the patients in the TDT group, 9 required reoperation compared to 12 in the non-TDT group. In the TDT group, 76.74% of the patients were able to restore intestinal continuity, whereas only 40% of the patients in the non-TDT group achieved restored intestinal continuity. In the TDT group, 48.48% of patients developed LAR syndrome (LARS), whereas in the non-TDT group, 90% of patients developed LARS. The median drainage time was 7 days, the median postoperative hospital stay was 21 days, the median fasting time was 6.5 days, and the median hospitalization cost was 109205.93 RMB.

CONCLUSION

TDT use lowered reoperation rate but did not increase hospitalization expenses. After ≥ 1 year of follow-up, its use improved intestinal patency rate and reduced the incidence of LARS.

Impact and Measurement of Mechanical Tension in Bowel Anastomosis: A Scoping Review of the Current Literature

INTRODUCTION

Creating a "tension-free anastomosis" is a fundamental principle in safe bowel surgery. This review aims to summarize the current literature regarding the measurement and impact of tension on bowel anastomoses.

METHODS

This scoping review was conducted using a systematic literature search in the PubMed, SCOPUS, and EMBASE databases. Data were synthesized in tables and summarized paragraphically, with studies assessed using the Newcastle-Ottawa scale.

RESULTS

Out of the 350 studies identified in the initial literature review, 25 were included in this study. Several studies indicated that anastomotic leak and tension are strongly associated, with the presence of tension making leaks up to 10 times more likely. However, no objective and clinically available methods exist to measure tension on bowel anastomosis in humans. Freedom from tension has traditionally been measured via surrogate measures of adequate bowel mobilization and subjective assessment by operating surgeons. Animal and cadaveric studies have been the frontier for objective measurement of wall tension. These studies use tensiometers to measure tension and automated machines or pulley and ratcheting systems to increase tension at specified intervals. However, these methods are universally destructive due to their design of measuring maximal tensile load and are not readily adaptable to the operating room.

CONCLUSIONS

The current literature does not address the objective measurement of bowel tension in live human subjects. Given the importance of tension, developing an objective, safe, intraoperative method to measure bowel wall tension would be a valuable surgical tool.

Long-term functional outcomes after Transanal Transection and Single-Stapled (TTSS) anastomosis for rectal cancer measured by electronic Patients Reported Outcome Measures (ePROMs)

BACKGROUND

The transanal transection and single-stapled anastomosis (TTSS) is gaining interest as a reconstructive technique whenever a restorative procedure after a total mesorectal excision (TME) is planned. TTSS, allowing lower anastomoses than the conventional DS technique, may raise discussion about its functional outcomes. The aim of this study was to compare long-term functional outcomes of TTSS and DS techniques performed after TME for rectal cancer (RC).

METHODS

This was a prospective, observational, two-parallel cohort study. Consecutive patients undergoing stoma closure after TME for RC with either TTSS or DS approach were included. The Low Anterior Resection Syndrome (LARS) questionnaire was delivered at 6, 12, and 24 months after stoma closure through a web link embedded in a Short Message System (SMS) or email using an electronic system (Esosphera Srl).

RESULTS

According to sample size calculation, 116 patients (58 per cohort) were included. No difference in the LARS score was found at 6 and 12 months, while a significantly lower median LARS was reported in TTSS cohort at 24 months (p = 0.034). The rate of patients with LARS and LARS sub-domains were comparable except for a lower fractioning in TTSS at 24 months (p = 0.005). Anastomoses in the TTSS cohort were significantly lower (p = 0.027), anastomotic leak rate was higher in the DS (p = 0.016).

CONCLUSIONS

Although lower anastomoses in TTSS cohort, functional outcomes were not inferior of those after DS technique.

Textbook anastomotic success in patients with low rectal cancer treated by intersphincteric resection: reappraising surgical, oncological, and functional outcomes

Previous studies on successful anastomosis after intersphincteric resection (ISR) for low rectal cancer (LRC) primarily focused on anastomotic complications rather than functional outcomes. Here, we improved the anastomotic success criteria by considering surgical, oncological, and functional outcomes and proposed a new composite outcome, "textbook anastomotic success" (TASS). This retrospective single-center study included patients with LRC treated with ISR from January 2014 to April 2020. TASS was defined as (1) no anastomotic complications occurring after ISR; (2) ileostomy was closed and there was no severe intestinal dysfunction 2 years after ISR; and (3) no local recurrence within 2 years of surgery. TASS was achieved upon meeting all indicators. We analyzed 259 patients with LRC, with 125 (48.3%) achieving TASS. Multivariate analysis showed that male sex (OR 0.47; 95% CI 0.27-0.81; p = 0.007), hypertension (OR 0.48; 95% CI 0.24-0.97; p = 0.041), ASA score ≥ 3 (OR 0.28; 95% CI 0.10-0.81; p = 0.018), pre-treatment major low anterior resection syndrome (OR 0.37; 95% CI 0.15-0.94; p = 0.037), and preoperative neoadjuvant chemoradiotherapy (OR 0.41; 95% CI 0.22-0.77; p = 0.006) were independent risk factors for not achieving TASS. Conversely, transverse coloplasty pouch (OR 2.13; 95% CI 1.07-4.25; p = 0.032) and higher anastomosis level (OR 1.56; 95% CI 1.05-2.30; p = 0.026) were independent protective factors for achieving TASS. The nomogram constructed to evaluate the probability of achieving TASS demonstrated good accuracy in the dataset (area under curve, 0.737). TASS provides a comprehensive quality assessment for ISR in patients with LRC. The nomogram predicting TASS may assist surgeons in decision-making for managing LRC.

Long-Term Functional Outcome After Early vs. Late Stoma Closure in Rectal Cancer Surgery: Sub-analysis of the Multicenter FORCE Trial

PURPOSE

The aim of this study was to assess the effect of early stoma closure on bowel function after low anterior resection (LAR) for rectal cancer.

METHODS

Patients participating in the FORCE trial who underwent LAR with protective stoma were included in this study. Patients were subdivided into an early closure group (< 3 months) and late closure group (> 3 months). Endpoints of this study were the Wexner Incontinence, low anterior resection syndrome (LARS), EORTC QLQ-CR29, and fecal incontinence quality of life (FIQL) scores at 1 year.

RESULTS

Between 2017 and 2020, 38 patients had received a diverting stoma after LAR for rectal cancer and could be included. There was no significant difference in LARS (31 vs. 30, p = 0.63) and Wexner score (6.2 vs. 5.8, p = 0.77) between the early and late closure groups. Time to stoma closure in days was not a predictor for LARS (R2 = 0.001, F (1,36) = 0.049, p = 0.83) or Wexner score (R2 = 0.008, F (1,36) = 0.287, p = 0.60) after restored continuity. There was no significant difference between any of the FIQL domains of lifestyle, coping, depression, and embarrassment. In the EORTC QLQ-29, body image scored higher in the late closure group (21.3 vs. 1.6, p = 0.004).

CONCLUSION

Timing of stoma closure does not appear to affect long-term bowel function and quality of life, except for body image. To improve functional outcome, attention should be focused on other contributing factors.

Incidence and risk factors of bowel dysfunction after minimally invasive rectal cancer surgery and discrepancies between the Wexner score and the low anterior resection syndrome (LARS) score

PURPOSE

Bowel dysfunction after sphincter-preserving-surgery (SPS) impacts quality of life. The Wexner score (WS) and the low anterior resection syndrome (LARS) score (LS) are instruments for assessing postoperative bowel dysfunction. We analyzed the incidence of and risk factors for each symptom and examined the discrepancies between the two scores.

METHODS

A total of 142 patients with rectal cancer, who underwent minimally invasive SPS between May, 2018 and July, 2019, were included. A questionnaire survey using the two scores was given to the patients 2 years after SPS.

RESULTS

Tumor location and preoperative radiotherapy were independent risk factors for major LARS. Intersphincteric resection with a hand-sewn anastomosis (HSA) was an independent risk factor for high WS. Among the patients who underwent HSA, 82% experienced incontinence for liquid stools, needed to wear pads, and suffered lifestyle alterations. Of the 35 patients with minor LARS, only 1 had a high WS, and 80.0% reported no lifestyle alterations. Among the 75 patients with major LARS, 58.7% had a low WS and 21.3% reported no lifestyle alterations.

CONCLUSION

The results of this study provide practical data to help patients understand potential bowel dysfunction after SPS. The discrepancies between the WS and LS were clarified, and further efforts are required to utilize these scores in clinical practice.

Low Anterior Resection Syndrome following Restorative Proctectomy for Rectal Cancer: Can the Surgeon Have Any Meaningful Impact?

Postoperative bowel dysfunction following restorative proctectomy, commonly referred to as Low Anterior Resection Syndrome (LARS), is a common long term sequela of rectal cancer treatment. While many of the established risk factors for LARS are non-modifiable, others may be well within the surgeon's control. Several pre-, intra-, and postoperative decisions may have a significant impact on postoperative bowel function. Some of these factors include the extent of surgical resection, surgical approach, choice of anastomotic reconstruction, and use of fecal diversion. This review article summarizes the available evidence regarding how surgical decision-making can affect postoperative bowel function.

Minor impact of anastomotic leakage in anterior resection for rectal cancer on long-term male urinary and sexual function

PURPOSE

Anastomotic leakage after anterior resection for rectal cancer induces bowel dysfunction, but the influence on urinary and sexual function is largely unknown. This cross-sectional cohort study evaluated long-term effect of anastomotic leakage on urinary and sexual function in male patients.

METHODS

Patients operated with anterior resection for rectal cancer in 15 Swedish hospitals 2007-2013 were identified. Anastomotic leakage and other clinical variables were retrieved from the Swedish Colorectal Cancer Registry and medical records. Urinary and sexual dysfunction were evaluated at 4 to 11 years after surgery using the International Prostate Symptom Score, International Index of Erectile Function, and European Organization for the Research and Treatment of Cancer Quality of Life Questionnaire CR29. The effect of anastomotic leakage on average scores of urinary and sexual dysfunction was evaluated as a primary outcome, and the single items permanent urinary catheter and sexual inactivity as secondary outcomes. The association of anastomotic leakage and functional outcomes was analyzed using regression models with adjustment for confounders.

RESULTS

After a median follow-up of 84 months (interquartile range: 67-110), 379 out of 864 eligible men were included. Fifty-nine (16%) patients had anastomotic leakage. Urinary incontinence was more common in the leakage group, with an adjusted mean score difference measured by EORTC QLQ ColoRectal-29 of 8.69 (95% confidence interval: 0.72-16.67). The higher risks of urinary frequency, permanent urinary catheter, and sexual inactivity did not reach significance.

CONCLUSION

Anastomotic leakage after anterior resection had a minor negative impact on urinary and sexual function in men.

Influence of neoadjuvant treatment strategy on perioperative outcomes in locally advanced rectal cancer

AIM

Neoadjuvant chemoradiotherapy (nCRT) in locally advanced rectal cancer facilitates tumour downstaging and complete pathological response (pCR). The goal of neoadjuvant systemic chemotherapy (total neoadjuvant chemotherapy, TNT) is to further improve local and systemic control. While some patients forgo surgery, total mesorectal excision (TME) remains the standard of care. While TNT appears to be noninferior to nCRT with respect to short-term oncological outcomes few data exist on perioperative outcomes. Perioperative morbidity including anastomotic leaks is associated with a negative effect on oncological outcomes, probably due to a delay in proceeding to adjuvant therapy. Thus, we aimed to compare conversion rates, rates of sphincter-preserving surgery and anastomosis formation rates in patients undergoing rectal resection after either TNT or standard nCRT.

METHODS

An institutional colorectal oncology database was searched from January 2018 to July 2023. Inclusion criteria comprised patients with histologically confirmed rectal cancer who had undergone neoadjuvant therapy and TME. Exclusion criteria comprised patients with a noncolorectal primary, those operated on emergently or who had local excision only. Outcomes evaluated included rates of conversion to open, sphincter-preserving surgery, anastomosis formation and anastomotic leak.

RESULTS

A total of 119 patients were eligible for inclusion (60 with standard nCRT, 59 with TNT). There were no differences in rates of sphincter preservation or primary anastomosis formation between the groups. However, a significant increase in conversion to open (p = 0.03) and anastomotic leak (p = 0.03) was observed in the TNT cohort.

CONCLUSION

In this series TNT appears to be associated with higher rates of conversion to open surgery and higher anastomotic leak rates. While larger studies will be required to confirm these findings, these factors should be considered alongside oncological benefits when selecting treatment strategies.

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.

Surgical and oncological results after rectal resections with or without previous treatment for prostate cancer

Introduction

Previous treatment for prostate cancer (PC) may potentially affect the surgical and oncological outcomes of subsequent rectal cancer surgery, but there are only a few studies regarding this particular group. In this study, we present the 3-year surgical and oncological results of rectal cancer patients who had received previous treatment for PC at a single Finnish tertiary referral centre.

Material and methods

Data regarding all male patients diagnosed with rectal cancer and treated at Tampere University Hospital (TAUH) between 1997 and 2016 were gathered from medical records. In total, this study included 553 rectal cancer patients who underwent curative surgery, and 54 of them (9.8%) had a prior history of treatment for prostate cancer.

Results

Patients in the PC group were older and had more comorbidities compared with those in the non-PC group. The PC patients had a significantly higher risk of permanent stoma compared with the non-PC patients (61.5% vs. 45.2%, respectively, p = 0.025). The PC patients seemed to have lower tumours than the non-PC patients (87% vs. 75%, respectively, p = 0.05). Overall, the 3-year overall survival (OS) for the PC and non-PC patients was 74.1% and 80.6%, respectively. No significant differences were observed between the study groups even in the age-adjusted comparison [hazard ratio (HR): 1.07, confidence interval (CI) 95%: 0.60-1.89]. In the univariable analysis, radically operated patients without a history of PC exhibited an improved overall survival, (HR: 2.46, 95% CI: 1.34-4.53, p = 0.004). However, only a higher age-adjusted Charlson comorbidity index (CCI) and a low tumour location (<10 cm) were found to have an independent prognostic impact on worse OS in the multivariable analysis (HR: 1.57, 95% CI: 1.36-1.82, p < 0.001 and HR: 2.74, 95% CI: 1.32-5.70, p = 0.007, respectively). No significant differences were observed between the groups in terms of disease-free or local recurrence-free survival.

Conclusion

Rectal cancer is more frequently found in the middle or lower part of the rectum in patients who have previously received treatment for prostate cancer. These patients also have a higher likelihood of requiring a permanent stoma. In radically operated rectal cancer, the PC group had a worse OS rate, according to the univariable analysis. However, the only independent prognostic factors for a worse OS that were highlighted in the multivariable analysis included a higher CCI and a low tumour location.

Consistency between POLARS and LARS scores regarding the incidence of low anterior resection syndrome in a Chilean population undergoing rectal surgery secondary to cancer in a high-volume hospital

AIM

The aim of this work was to evaluate the concordance between the low anterior resection syndrome (LARS) and preoperative LARS (POLARS) scores regarding the incidence of LARS in a Chilean population undergoing rectal surgery for cancer in a high-volume hospital.

METHOD

The LARS score questionnaire, following telephone requests, was used to determine the presence and severity of LARS. The POLARS score was calculated based on variables described previously. Correlations and qualitative and quantitative concordance were evaluated using Spearman's correlation coefficient, the kappa coefficient and the Bland-Altman plot with Lin's concordance correlation coefficient.

RESULTS

A total of 120 patients met the inclusion criteria: 37.5% underwent neoadjuvant radiotherapy, 61% underwent total mesorectal excision (TME) and 51.6% underwent ostomy. A total of 49% of patients did not present with LARS, whereas 28% had major LARS. The correlation between scales was poor, with a fair qualitative concordance to determine the presence/absence of LARS and a slight qualitative concordance to determine the degree of the intensity. The quantitative concordance was poor.

CONCLUSION

In the Chilean population, concordance between the LARS and POLARS scores was qualitatively fair to determine the presence/absence of the disease and qualitatively slight to determine the degree of intensity. We do not suggest using the POLARS score in the perioperative period in the Chilean population deliberately, as the score may help to determine the presence/absence of LARS but cannot determine its degree of intensity. Additional evaluations are required to determine the factors contributing to the degree of agreement between the scales.

Is Delaying a Coloanal Anastomosis the Ideal Solution for Rectal Surgery?: Analysis of a Multicentric Cohort of 564 Patients From the GRECCAR

OBJECTIVES

To assess the specific results of delayed coloanal anastomosis (DCAA) in light of its 2 main indications.

BACKGROUND

DCAA can be proposed either immediately after a low anterior resection (primary DCAA) or after the failure of a primary pelvic surgery as a salvage procedure (salvage DCAA).

METHODS

All patients who underwent DCAA intervention at 30 GRECCAR-affiliated hospitals between 2010 and 2021 were retrospectively included.

RESULTS

Five hundred sixty-four patients (male: 63%; median age: 62 years; interquartile range: 53-69) underwent a DCAA: 66% for primary DCAA and 34% for salvage DCAA. Overall morbidity, major morbidity, and mortality were 57%, 30%, and 1.1%, respectively, without any significant differences between primary DCAA and salvage DCAA ( P = 0.933; P = 0.238, and P = 0.410, respectively). Anastomotic leakage was more frequent after salvage DCAA (23%) than after primary DCAA (15%), ( P = 0.016).Fifty-five patients (10%) developed necrosis of the intra-abdominal colon. In multivariate analysis, intra-abdominal colon necrosis was significantly associated with male sex [odds ratio (OR) = 2.67 95% CI: 1.22-6.49; P = 0.020], body mass index >25 (OR = 2.78 95% CI: 1.37-6.00; P = 0.006), and peripheral artery disease (OR = 4.68 95% CI: 1.12-19.1; P = 0.030). The occurrence of this complication was similar between primary DCAA (11%) and salvage DCAA (8%), ( P = 0.289).Preservation of bowel continuity was reached 3 years after DCAA in 74% of the cohort (primary DCAA: 77% vs salvage DCAA: 68%, P = 0.031). Among patients with a DCAA mannered without diverting stoma, 75% (301/403) have never required a stoma at the last follow-up.

CONCLUSIONS

DCAA makes it possible to definitively avoid a stoma in 75% of patients when mannered initially without a stoma and to save bowel continuity in 68% of the patients in the setting of failure of primary pelvic surgery.

Clinical Management of Low Anterior Resection Syndrome: Review of the Current Diagnosis and Treatment

BACKGROUND

Low anterior resection syndrome (LARS) is a series of bowel dysfunction symptoms, including altered bowel frequency, irregular bowel rhythms, fecal incontinence, and constipation. LARS occurs in 80% of patients undergoing sphincter-preserving surgery, affecting patients' quality of life along with social avoidance. Different measurements and treatments have been raised to deal with LARS, but no systematic standard has been developed.

OBJECTIVE AND METHODS

To promote the standardization of clinical trials and clinical management of LARS, this review summarizes the latest findings up until 2023 regarding the diagnostic criteria, assessment protocols, and treatment modalities for postoperative LARS in rectal cancer.

RESULTS

The diagnostic criteria for LARS need to be updated to the definition proposed by the LARS International Collaborative Group, replacing the current application of the LARS score. In both clinical trials and clinical treatment, the severity of LARS should be assessed using at least one symptom assessment questionnaire, the LARS score or MSKCC BFI, and at least one scale related to quality of life. Anorectal manometry, fecoflowmetry, endoscopic ultrasonography, and pelvic floor muscle strength testing are recommended to be adopted only in clinical trials. After analysis of the latest literature on LARS treatment, a stepwise classification model is established for the standardized clinical management of LARS. Patients with minor LARS can start with first-line treatment, including management of self-behavior with an emphasis on diet modification and medication. Lamosetron, colesevelam hydrochloride, and loperamide are common antidiarrheal agents. Second-line management indicates multi-mode pelvic floor rehabilitation and transanal irrigation. Patients with major LARS should select single or several treatments in second-line management. Refractory LARS can choose antegrade enema, neuromodulation, or colostomy.

CONCLUSIONS

In clinical trials of LARS treatment between 2020 and 2022, the eligibility criteria and evaluation system have been variable. Therefore, it is urgent to create a standard for the diagnosis, assessment, and treatment of LARS. Failure to set placebos and differentiate subgroups are limitations of many current LARS studies. Randomized controlled trials comparing diverse therapies and long-term outcomes are absent, as well. Moreover, a new scale needs to be developed to incorporate the patient's perspective and facilitate outpatient follow-up. Though the establishment of a stepwise classification model for LARS treatment here is indispensable, the refinement of the guidelines may be improved by more standardized studies.

Risk factors associated with low anterior resection syndrome: a cross-sectional study

PURPOSE

Oncological outcomes following rectal cancer surgery have improved significantly over recent decades with lower recurrences and longer overall survival. However, many of the patients experienced low anterior resection syndrome (LARS). This study identified the prevalence and risk factors associated with the development of LARS.

METHODS

This cross-sectional study involved patients who were diagnosed with rectal cancer and had undergone sphincter-preserving low anterior resection from January 2011 to December 2020. Upon clinic follow-up, patients were asked to complete an interviewed based questionnaire (LARS score) designed to assess bowel dysfunction after rectal cancer surgery.

RESULTS

Out of 76 patients, 25 patients (32.9%) had major LARS, 10 patients (13.2%) had minor LARS, and 41 patients (53.9%) had no LARS. The height of tumor from anal verge showed an association with the development of major LARS (P=0.039). Those patients with less than 8 cm tumor from anal verge had an increased risk of LARS by 3 times compared to those with 8 cm and above (adjusted odds ratio, 3.11; 95% confidence interval, 1.06-9.13).

CONCLUSION

Results from our study show that low tumor height was a significant risk factor that has a negative impact on bowel function after surgery. The high prevalence of LARS emphasizes the need for study regarding risk factors and the importance of understanding the pathophysiology of LARS, in order for us to improve patient bowel function and quality of life after rectal cancer surgery.

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.

Low Anterior Resection Syndrome (LARS) after Surgery for Rectal Cancer: An Inevitable Price to Pay for Survival, or a Preventable Complication?

BACKGROUND

Rectal cancer is frequent and often treated with sphincter-saving procedures that may cause LARS, a syndrome characterized by symptoms of bowel disfunction that may severely affect quality of life. LARS is common, but its pathogenesis is mostly unknown. The aim of this study is to assess the incidence of LARS and to identify potential risk factors.

METHODS

We performed an observational retrospective single center analysis. The following data were collected and analyzed for each patient: demographics, tumor-related data, and intra- and peri-operative data. Statistical analysis was conducted, including descriptive statistics and multivariate logistic regression to identify independent risk factors.

RESULTS

Total LARS incidence was 31%. Statistically significant differences were found in tumor distance from anal verge, tumor extension (pT and diameter) and tumor grading (G). Multivariate analysis identified tumor distance from anal verge and tumor extension as an independent predictive factor for both major and total LARS. Adjuvant therapy, although not significant at univariate analysis, was identified as an independent predictive factor. Time to stoma closure within 10 weeks seems to reduce incidence of major LARS.

CONCLUSIONS

bold LARS affects a considerable portion of patients. This study identified potential predictive factors that could be useful to identify high risk patients for LARS.

Diagnostic accuracy of water-soluble contrast enema, contrast-enema computed tomography and endoscopy in detecting anastomotic leakage after (Colo) proctectomy: A meta-analysis

BACKGROUND

Anastomotic leakage (AL) as a result of creation of a colorectal/anal anastomosis still represents a frequent complication of colorectal surgery, with short- and long-term consequences on postoperative morbidity, quality of life and oncological outcomes. However, early diagnosis of AL may result in improved outcomes. The aims of this study were to evaluate the diagnostic accuracy of water-soluble contrast enema (WSCE), contrast enema computed tomography (CECT) and endoscopy in identifying AL and to identify the diagnostic procedure that is most accurate.

METHODS

A systematic review and meta-analysis of 19 studies accounting for a total of 25 tests reporting diagnostic accuracy estimates was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses of Diagnostic Test Accuracy Studies (PRISMA-DTA) guidelines up to June 2021. For the diagnostic tests we evaluated the pooled estimates and conducted pairwise comparisons.

RESULTS

For WSCE, the pooled sensitivity was 0.50, the pooled specificity was 0.99 and the area under the curve (AUC) was 0.91. For endoscopy, the pooled sensitivity was 0.69, specificity was 1.00 and AUC was 0.99. The pooled sensitivity and specificity for CECT were 0.89 and 1.00, respectively; the AUC was 0.99. The comparison between CECT and WSCE highlighted a significantly greater sensitivity (p = 0.04) for CECT, whereas no difference was found for specificity. Compared with CECT, endoscopy was not significantly more accurate in terms of either sensitivity or specificity. Endoscopy was found to be significantly more specific than WSCE (p = 0.031) but no difference was found for sensitivity.

CONCLUSION

Water-soluble contrast enema, endoscopy and CECT have an elevated diagnostic accuracy. However, WSCE is less accurate than either endoscopy or CECT. Although greater sensitivity was demonstrated for CECT compared with endoscopy, this was not significant.

A novel nomogram to predict low anterior resection syndrome (LARS) after ileostomy reversal for rectal cancer patients

BACKGROUND AND AIM

Low anterior resection syndrome (LARS) in patients undergoing low or ultra-low anterior resection (LAR) is a common problem and significantly impacts the quality of life. Patients with an ileostomy after LAR are more likely to develop LARS. However, there hasn't been a model predicting LARS occurrence in these patients. This study aims to construct a nomogram to predict the probability of LARS occurrence in patients with temporary ileostomy and guide preventive strategies before reversal.

METHODS

168 patients undergoing LAR with ileostomy from one center were enrolled as the training cohort, and 134 patients of the same inclusion criteria from another center were enrolled as the validation cohort. The training cohort was screened for risk factors for major LARS using univariate and multivariate logistic regression. The nomogram was constructed using the filtered variables, the ROC curve was used to describe the model's discrimination, and the calibration was used to describe the accuracy.

RESULTS

The optimal cut-off value for stoma closure time was 128 days. Three risk factors were identified using logistic regression analysis: preoperative radiotherapy (OR = 3.038, [95%CI 1.75-5.015], P = 0.005), stoma closure time (OR = 2.298, [95%CI 1.088-4.858], P = 0.029) and pN stage (OR = 1.739, [95%CI 1.235-3.980], P = 0.001). A nomogram was constructed based on these three variables and showed good performance predicting major LARS after stoma reversal. The area under the curve (AUC) was 0.827 in the training group and 0.821 in the validation group; The calibration curve suggested good precision in both groups.

CONCLUSIONS

This novel nomogram can accurately predict the probability of major LARS occurrence after ileostomy reversal for rectal cancer patients. This model can help screen ileostomy patients with high risks and guide individualized preventive strategies before stoma reversal.

Postoperative Morbidity Following Loop Ileostomy Reversal after Primary Elective or Urgent Surgery: A Retrospective Study with 145 Patients

Temporary loop ileostomy is usually performed to protect distal anastomosis or to treat urgent surgical cases. The aim of this study is to evaluate whether, after primary urgent stoma construction, patients undergoing ileostomy reversal have different postoperative outcomes compared with patients who have protective stoma performed in an elective setting. A retrospective observational study was conducted including patients who underwent ileostomy reversal. Baseline patient characteristics and perioperative outcomes were collected in a single database. The overall morbidity rate during recovery was fixed as a primary outcome. Between 2011 and 2021, the complete data records of 145 patients were evaluated. After ileostomy reversal, the postoperative morbidity rate did not differ between groups (14.4% vs. 11.5%, p = 0.790). Even considering each complication, such as ileus, small bowel obstruction, bleeding and wound infection, no significant difference was detected. Similarly, the time to first flatus was 2.25 ± 1.24 vs. 2.1 ± 0.99 (p = 0.379) and the length of hospital stay was 5.43 ± 3.03 vs. 5.84 ± 5.15 (p = 0.568). The only significant factor associated with postoperative complications on logistic regression analysis was the presence of comorbidities (OR 4.49; 95% CI 1.19-29.4, p = 0.05). In the present cohort of patients, there was no difference in the postoperative complication rate after stoma closure following elective or urgent indication for surgery.

Development of prediction model of low anterior resection syndrome for colorectal cancer patients after surgery based on machine-learning technique

BACKGROUND

Low anterior resection syndrome (LARS) is a common postoperative complication in patients with colorectal cancer, which seriously affects their postoperative quality of life. At present, the aetiology of LARS is still unclear, but some risk factors have been studied. Accurate prediction and early management of medical intervention are keys to improving the quality of life of such high-risk patients.

OBJECTIVES

Based on machine-learning methods, this study used the follow-up results of postoperative patients with colorectal cancer to develop prediction models for LARS and conducted a comparative analysis between the different models.

METHODS

A total of 382 patients diagnosed with colorectal cancer and undergoing surgery at West China Hospital from April 2017 to December 2020 were retrospectively selected as the development cohort. Logistic regression, support vector machine, decision tree, random forest and artificial neural network algorithms were used to construct the prediction models of the obtained dataset. The models were internally validated using cross-validation. The area under the curve and Brier score measures were used to evaluate and compare the differentiation and calibration degrees of the models. The sensitivity, specificity, positive predictive value and negative predictive value of the different models were described for clinical use.

RESULTS

A total of 342 patients were included, the incidence of LARS being 47.4% (162/342) during the six-month follow-up. After feature selection, the factors influencing the occurrence of LARS were found to be location, distance, diverting stoma, exsufflation and surgical type. The prediction models based on five machine-learning methods all showed acceptable performance.

CONCLUSIONS

The five models developed based on the machine-learning methods showed good prediction performance. However, considering the simplicity of clinical use of the model results, the logistic regression model is most recommended. The clinical applicability of these models will also need to be evaluated with external cohort data.

High Risk of Low Anterior Resection Syndrome in Long-term Follow-up After Anastomotic Leakage in Anterior Resection for Rectal Cancer

BACKGROUND

Low anterior resection syndrome is common after sphincter-sparing surgery, but it is unclear to what extent anastomotic leakage after anterior resection contributes to this condition.

OBJECTIVE

The aim of this study is to assess the long-term effect of anastomotic leakage on the occurrence of major low anterior resection syndrome.

DESIGN

This is a retrospective observational cohort study evaluating low anterior resection syndrome 4 to 11 years after index surgery. After propensity score-matching using the covariates sex, age, tumor stage, comorbidity, neoadjuvant treatment, extent of mesorectal excision, and defunctioning stoma at index surgery, the effect of anastomotic leakage on low anterior resection syndrome was investigated using relative risk and 95% CI.

SETTINGS

This multicenter study included patients from 15 Swedish hospitals between 2007 and 2013.

PATIENTS

Patients who underwent anterior resection for rectal cancer were included.

MAIN OUTCOME MEASURES

Outcome measures included patient-reported major low anterior resection syndrome, obtained via a postal questionnaire that included a question on stoma status.

RESULTS

Among 1099 patients, 653 (59.4%) responded in at a median of 83.5 (interquartile range 66 to 110) months postoperatively. After excluding patients with residual stoma or incomplete responses, 544 remained; of these, 42 had anastomotic leakage. Patients with anastomotic leakage were more likely to have major low anterior resection syndrome (66.7% [28/42]) than patients without leakage (45.8% [230/502]). After matching, anastomotic leakage was significantly related to major low anterior resection syndrome (relative risk 2.3; 95% CI 1.4-3.9) and the individual symptom of urgency (relative risk 2.1; 95% CI 1.1-4.1).

LIMITATIONS

This study was limited by its retrospective observational study design.

CONCLUSIONS

In long-term follow-up, major low anterior resection syndrome is common after anterior resection for rectal cancer. Anastomotic leakage appears to increase the risk of major low anterior resection syndrome, with urgency as a major contributing symptom. See Video Abstract at http://links.lww.com/DCR/B868 .

ALTO RIESGO DE SNDROME DE RESECCIN ANTERIOR BAJA EN EL SEGUIMIENTO A LARGO PLAZO TRAS FUGA ANASTOMTICA EN RESECCIN ANTERIOR POR CNCER DE RECTO

ANTECEDENTES:El síndrome de resección anterior baja es común después de una cirugía con preservación de esfínter pero no está claro hasta qué punto contribuye a esta condición la fuga anastomótica después de una resección anterior.OBJETIVO:El objetivo de este estudio es evaluar el efecto a largo plazo de la fuga anastomótica sobre la aparición de un síndrome de resección anterior baja mayor.DISEÑO:Se trata de un estudio de cohorte observacional retrospectivo que evalúa el síndrome de resección anterior baja 4-11 años después de la cirugía índice. Después del apareamiento por puntuación de propensión utilizando las covariables sexo, edad, estadio del tumor, comorbilidad, tratamiento neoadyuvante, extensión de la escisión mesorrectal y estoma de derivación en la cirugía índice, se investigó el efecto de la fuga anastomótica en el síndrome de resección anterior baja utilizando el riesgo relativo y intervalos de confianza de 95%.AJUSTES:Este estudio multicéntrico incluyó pacientes de 15 hospitales suecos entre 2007 y 2013.PACIENTES:Se incluyeron pacientes que fueron sometidos a resección anterior por cáncer de recto.PRINCIPALES MEDIDAS DE DESENLACE:Síndrome de resección anterior baja mayor informado por el paciente, obtenido a través de un cuestionario postal que incluye una pregunta sobre el estado de estomas.RESULTADOS:De 1099 pacientes, 653 (59,4%) respondieron una mediana de 83,5 meses después de la operación (rango intercuartílico 66-110).Después de excluir a los pacientes con estoma residual o respuestas incompletas, quedaron 544; de estos, 42 tuvieron fuga anastomótica. Los pacientes con fuga anastomótica tenían síndrome de resección anterior baja mayor en el 66,7% (28/42) en comparación con el 45,8% (230/502) de los pacientes sin fuga. Después del apareamiento, la fuga anastomótica se relacionó significativamente con el síndrome de resección anterior baja mayor (riesgo relativo 2,3; intervalo de confianza del 95%: 1,4-3,9) y con el síntoma individual de urgencia (riesgo relativo 2,1; intervalo de confianza del 95% 1,1-4,1).LIMITACIONES:Este estudio estuvo limitado por su diseño de estudio observacional retrospectivo.CONCLUSIONES:En el seguimiento a largo plazo, el síndrome de resección anterior baja mayor es común después de la resección anterior por cáncer de recto. La fuga anastomótica parece aumentar el riesgo de síndrome de resección anterior baja mayor, siendo la urgencia uno de los principales síntomas contribuyentes. Consulte Video Resumen en http://links.lww.com/DCR/B868 . (Traducción-Dr. Juan Carlos Reyes ).

Anterior Resection Syndrome and Quality of Life With Long-term Follow-up After Rectal Cancer Resection

BACKGROUND

Surgical and systemic therapies continue to advance, enabling restorative resections for distal rectal cancer. These operations are associated with low anterior resection syndrome. Recent studies with methodological and size limitations have investigated the incidence of low anterior resection syndrome after anterior resection. However, the long-term trajectory of low anterior resection syndrome and its effect on health-related quality of life remain unclear.

OBJECTIVE

The purpose of this study was to assess the impact of anterior resection and reversal of ileostomy on long-term health-related quality of life and low anterior resection syndrome.

DESIGN

Patient demographics were analyzed alongside low anterior resection syndrome and health-related quality-of-life qualitative scores (EORTC-QLQ-C30) obtained through cross-sectional postal questionnaires.

SETTING

Patients who underwent anterior resection of the rectum for cancer with defunctioning ileostomy between 2003 and 2016 at 2 high-volume centers in the United Kingdom were identified, excluding those experiencing anastomotic leakage.

PATIENTS

Among 478 eligible patients, 311 (65.1%) participated at a mean of 6.5 ± 0.2 years after anterior resection. Demographics and neoadjuvant chemoradiotherapy rates were similar ( p > 0.05) between participants and nonparticipants.

RESULTS

The percentage of patients who experienced major low anterior resection syndrome was 53.4% (166/311). Health-related quality-of-life functional domain scores improved in the years after reversal of ileostomy, with significant changes in constipation ( p = 0.01), social function ( p = 0.03), and emotional scores ( p = 0.02), as well as a reduction in the prevalence of major low anterior resection syndrome ( p = 0.003).

LIMITATIONS

The main limitation of this study was that the data collected were cross-sectional rather than longitudinal, and that nonresponders may have had worse cancer symptoms.

CONCLUSIONS

In this first large-scale study assessing long-term function after anterior resection and reversal of ileostomy, there is a linear improvement in major low anterior resection syndrome beyond 6 years, alongside improvements in key quality-of-life measures. See Video Abstract at http://links.lww.com/DCR/B825 .

SEGUIMIENTO A LARGO PLAZO DEL SNDROME DE RESECCIN ANTERIOR BAJA Y LA CALIDAD DE VIDA POR CNCER DE RECTO

ANTECEDENTES:Los tratamientos tanto quirúrgicos como sistémicos continúan evolucionando día a día, así éstos permiten resecciones restaurativas por cáncer de recto distal. Estas operaciones están asociadas con el síndrome de resección anterior baja. Estudios recientes con limitaciones tanto metodológicas como de talla han estudiado la incidencia del síndrome de resección anterior bajo post-quirúrgico. Sin embargo, la evolución a largo plazo del síndrome de resección anterior baja y su acción sobre la calidad de vida relacionadas con la salud siguen sin estar claros.OBJETIVO:Evaluar el impacto de la resección anterior baja y el cierre de la ileostomía en la calidad de vida relacionadas con la salud a largo plazo y el síndrome post-resección anterior.AJUSTE:Se incluyeron todos los pacientes sometidos a una reseccción anterior baja de recto por cáncer asociada a una ileostomía de protección entre 2003 y 2016 en dos centros de gran volumen en el Reino Unido, se excluyeron los pacientes que presentaron fuga anastomótica.DISEÑO:Se revisaron los datos demográficos de todos los pacientes que presentaban el síndrome de resección anterior baja, se revisaron las puntuaciones de la calidad de vida relacionadas con el estado general de salud (EORTC-QLQ-C30) obtenidas a través de cuestionarios transversales enviados por correo.PACIENTES:478 pacientes fueron escogidos, 311 (65,1%) participaron del estudio en una media de 6,5 ± 0,2 años después de la resección anterior. Las tasas demográficas y de radio-quimioterapia neoadyuvante fueron similares (p > 0,05) entre los participantes y los no participantes.RESULTADOS:El porcentaje de pacientes que experimentaron síndrome de resección anterior baja mayor fue del 53,4% (166/311).PRINCIPALES MEDIDAS DE RESULTADO:Las puntuaciones funcionales en la calidad de vida relacionadas con estado general de salud mejoraron en los años posteriores al cierre de la ileostomía de protección, los cambios fueron significativos con relación al estreñimiento (p = 0,01), con relación a la actividad social (p = 0,03) y con las puntuaciones emocionales (p = 0,02), así como con la reducción de la prevalencia del síndrome de resección anterior baja mayor (p = 0,003).LIMITACIONES:La principal limitación del presente estudio mostró que los datos recopilados fueron transversales y no longitudinales, y que los pacientes no respondedores pueden haber tenido peores síntomas relacionados con el cáncer.CONCLUSIONES:Este primer estudio a gran escala, evalúa la función a largo plazo después de la resección anterior baja y el cierre de la ileostomía, demuestra una mejoría lineal en el síndrome de resección anterior baja de grado importante, más allá de los 6 años, asociado con la mejoría en las medidas clave de calidad de vida. Consulte Video Resumen en http://links.lww.com/DCR/B825 . (Traducción-Dr. Xavier Delgadillo ).

The risk factors of low anterior resection syndrome after colorectal cancer surgery: A retrospective study of 566 patients in a single institution in China

PURPOSE

This study aims to identify the independent risk factors in the low anterior resection syndrome (LARS) after surgery for colorectal cancer (CRC).

METHOD

This was a retrospective, single-institution study in the Second Affiliation Hospital of Dalian Medical University, China. Patients underwent sphincter-preserving low anterior resection with total or partial mesorectal resection (with or without protective ileostomy) and completed a self-filled questionnaire over the phone to assess postoperative bowel dysfunction from January 2017 to December 2019. The predictors of LAR were evaluated using univariate and multivariate analyses.

RESULT

The study population was 566 patients, 264 (46.64%), 224 (39.58%), and 78 (13.78%) patients with no, minor, and major LARS, respectively. In the univariate analysis, independent factors such as tumor location and size, anastomotic height, protective ileostomy, post-operation chemoradiotherapy, tumor T stage, lymphatic nodal metastasis classification, surgery duration, and time interval for closure of stoma were significantly associated with LARS points while we found the tumor T stage and lymphatic nodal metastasis classification as the new independent risk factors compared with the last decade studies. In the multivariate analysis, factors such as low and middle tumor location and protective ileostomy, and post operation treatment, nodal metastasis classification were the independent risk factors for major LARS.

CONCLUSION

The new independence risk factors were tumor T stage and lymphatic nodal metastasis status in univariate analysis in our study, with anastomotic height, low and middle tumor location, protective ileostomy, post-operation chemoradiotherapy, nodal metastasis status increasing LARS point in multivariate analysis after surgery for CRC.

Trans-Anastomotic Drainage Tube Placement After Hand-Sewn Anastomosis in Patients Undergoing Intersphincteric Resection for Low Rectal Cancer: An Alternative Drainage Method

Anastomotic leakage (AL) is a common complication after intersphincteric resection (ISR). It significantly reduces quality of life and causes great distress to patients. Although traditional drainage (e.g., anal and pelvic catheters) may reduce the impact of AL to some extent, their role in reducing the incidence of AL remains controversial. In this study, we developed a novel drainage technique involving the placement of drainage tubes through the gap between sutures during handsewn anastomosis, to reduce the occurrence of anastomotic leakage. We retrospectively analyzed 34 consecutive patients who underwent intersphincteric resection requiring handsewn anastomosis between February 1, 2017, and January 1, 2021. Patients were classified into the trans-anastomotic drainage tube group (TADT, n = 14) and the non-TADT group (n = 20) based on whether trans-anastomotic tube placement was performed. The incidence of postoperative complications, such as AL, was compared between the two groups, and anal function of patients at 1-year post-ISR was evaluated. Six cases of AL occurred in the non-TADT group, while none occurred in the TADT group; this difference was statistically significant (p=0.031). The TADT group also had a shorter hospital stay (p=0.007). There were no other significant intergroup differences in operation time, blood loss, pain score, anastomotic stenosis, intestinal obstruction, or incidence of wound infection. In the 30 patients (88.2%) evaluated for anal function, there were no significant intergroup differences in stool frequency, urgency, daytime/nocturnal soiling, Wexner incontinence score, or Kirwan grading. Taken together, trans-anastomotic tube placement is a novel drainage method that may reduce AL after ISR requiring handsewn anastomosis and without adversely affecting anal function.

The Longitudinal Course of Low-anterior Resection Syndrome: An individual Patient Meta-analysis

OBJECTIVE

We aimed to better understand the longitudinal course of low anterior resection syndrome (LARS) to guide patient expectations and identify those at risk of persisting dysfunction.

SUMMARY BACKGROUND DATA

LARS describes disordered bowel function after rectal resection that significantly impacts quality of life.

METHODS

MEDLINE, EMBASE, CENTRAL, and CINAHL databases were systematically searched for studies that enrolled adults undergoing anterior resection for rectal cancer and used the LARS score to assess bowel function at ≥2 postoperative time points. Regression analyses were performed on deidentified patient-level data to identify predictors of change in LARS score from baseline (3-6months) to 12-months and 18-24 months.

RESULTS

Eight studies with a total of 701 eligible patients were included. The mean LARS score improved over time, from 29.4 (95% confidence interval 28.6-30.1) at baseline to 16.6 at 36 months (95% confidence interval 14.2%-18.9%). On multivariable analysis, a greater improvement in mean LARS score between baseline and 12 months was associated with no ileostomy formation [mean difference (MD) -1.7 vs 1.7, P < 0.001], and presence of LARS (major vs minor vs no LARS) at baseline (MD -3.8 vs -1.7 vs 5.4, P < 0.001). Greater improvement in mean LARS score between baseline and 18-24 months was associated with partial mesorectal excision vs total mesorectal excision (MD-8.6 vs 1.5, P < 0.001) and presence of LARS (major vs minor vs no LARS) at baseline (MD -8.8 vs -5.3 vs 3.4, P < 0.001).

CONCLUSIONS

LARS improves by 18 months postoperatively then remains stable for up to 3 years. Total mesorectal excision, neoadjuvant radiotherapy, and ileostomy formation negatively impact upon bowel function recovery.

The effect of anastomotic leak on postoperative pelvic function and quality of life in rectal cancer patients

AIM

The aim of this review was to collect all available literature data analysing the effects of the anastomotic leak (AL) on post-sphincter preserving rectal cancer surgery bowel and urogenital function as well as to quality of life (QoL) dimensions.

METHODS

A literature search of the PubMed and Embase electronic databases was conducted by two independent investigators and all studies using either functional parameters or QoL as a primary or secondary endpoint after a rectal cancer surgery AL were included.

RESULTS

Amongst the 13 identified studies focusing on the post-AL neorecto-anal function, 3 case-matched studies,3 comparative studies and 1 population-based study supported the deleterious effects of the AL on bowel function, with disturbances of the types of high bowel movement frequency, urgency and increased incontinent episodes to predominate. At one case-matched study the Low Anterior Resection Syndrome (LARS) score was inferior in the AL patients. At limited under-powered studies, urinary frequency, reduced male sexual activity and female dyspareunia may be linked to a prior AL. According to two QoL-targeted detailed studies, QoL disturbances, such as physical and emotional function difficulties may persist up to 3 years after the AL occurrence.

CONCLUSIONS

AL may have adverse effects on postoperative pelvic function and QoL in rectal cancer patients. As evidenced by this literature review, the limited reports on this intriguing topic may trigger the initiative for planning and undertaking larger, multicentre studies on rectal cancer patients with varying degrees of AL severity.

Post-Operative Functional Outcomes in Early Age Onset Rectal Cancer

BACKGROUND

Impairment of bowel, urogenital and fertility-related function in patients treated for rectal cancer is common. While the rate of rectal cancer in the young (<50 years) is rising, there is little data on functional outcomes in this group.

METHODS

The REACCT international collaborative database was reviewed and data on eligible patients analysed. Inclusion criteria comprised patients with a histologically confirmed rectal cancer, <50 years of age at time of diagnosis and with documented follow-up including functional outcomes.

RESULTS

A total of 1428 (n=1428) patients met the eligibility criteria and were included in the final analysis. Metastatic disease was present at diagnosis in 13%. Of these, 40% received neoadjuvant therapy and 50% adjuvant chemotherapy. The incidence of post-operative major morbidity was 10%. A defunctioning stoma was placed for 621 patients (43%); 534 of these proceeded to elective restoration of bowel continuity. The median follow-up time was 42 months. Of this cohort, a total of 415 (29%) reported persistent impairment of functional outcomes, the most frequent of which was bowel dysfunction (16%), followed by bladder dysfunction (7%), sexual dysfunction (4.5%) and infertility (1%).

CONCLUSION

A substantial proportion of patients with early-onset rectal cancer who undergo surgery report persistent impairment of functional status. Patients should be involved in the discussion regarding their treatment options and potential impact on quality of life. Functional outcomes should be routinely recorded as part of follow up alongside oncological parameters.

Delayed pull-through coloanal anastomosis without temporary stoma: an alternative to the standard manual side-to-end coloanal anastomosis with temporary stoma? A comparative study in 223 patients with low rectal cancer

AIM

After total mesorectal excision (TME) for low rectal cancer, current guideline recommendations for sphincter-saving surgery are to perform a side-to-end manual coloanal anastomosis (CAA) (or with J-pouch) with a temporary stoma. Our study aimed to evaluate if delayed pull-through coloanal anastomosis (DCAA) without a temporary stoma could represent a safe alternative in low rectal cancer.

METHOD

From 2003 to 2020, 223 consecutive patients with low rectal cancer undergoing TME were compared: CAA and diverting stoma (n = 190) versus DCAA without stoma (n = 33).

RESULTS

Overall 3-month and severe (Dindo ≥ IIIb) morbidity rates were similar in CAA versus DCAA groups: 34% (65/190) vs. 36% (12/33) and 2.6% (5/190) vs. 3% (1/33), respectively. In the DCAA group, only one patient (3%) underwent reoperation (Hartmann's procedure) at day 3 due to colon necrosis. The anastomotic leakage rate (both clinical and radiological) was significantly higher after CAA than DCAA: 28% (53/190) vs. 3% (1/33; p = 0.00138). Failure of the procedure (with return to stoma) was observed in 8% (15/190) vs. 6% (2/33) of patients after CAA and DCAA respectively (not significant).

CONCLUSION

Our comparative study suggested that in patients with low rectal cancer, DCAA without a temporary stoma could represent an interesting alternative to the actual recommended CAA with a temporary ileostomy. DCAA could offer two major advantages over CAA: a significantly lower rate of anastomotic leakage and absence of a temporary stoma and its potential complications (rehospitalization, dehydration, wound hernia after stoma closure).

Redo-surgery after failed colorectal or coloanal anastomosis: Morbidity, mortality and factors predictive of success. A retrospective study of 200 patients

AIM

In cases of anastomotic failure after colorectal (CRA) or coloanal anastomosis (CAA), revision of the anastomosis is an ambitious surgical option that can be proposed in order to maintain bowel continuity. Our aim was to assess postoperative morbidity, risk of failure and risk factor for failure in patients after CRA or CAA.

METHODS

All consecutive patients who underwent redo-CRA/CAA in our institution between 2007-2018 were retrospectively included. The success of redo-CRA/CAA was defined by the restoration of bowel continuity 12 months after the surgery.

RESULTS

Two hundred patients (114 male: 57%) were analyzed. The indication for redo-CRA/CAA was chronic pelvic infection in 74 patients (37%), recto-vaginal or urinary fistula in 59 patients (30%), anastomotic stenosis in 36 patients (18%) and redo anastomosis after previous anastomosis takedown in 31 patients (15%). Twenty-three percent of the patients developed a severe postoperative complication. Anastomotic leakage was diagnosed in 39 patients (20%). One-year-success of the redo-CRA/CAA was obtained in 80% of patients. In multivariate analysis, only obesity was associated with redo-CRA/CAA failure (p = 0.042). We elaborated a pre-operative predictive score of success using the four variables: male sex, age > 60 years, obesity and history of pelvic radiotherapy. The success of redo-CRA/CAA was 92%, 86%, 80% and 62% for a preoperative predictive score value of 0, 1, 2 and ≥3, respectively (p = 0.010).

CONCLUSIONS

In case of failure of primary CRA/CAA, bowel continuity can be saved in 4 out of 5 patients by redo-CRA/CAA despite 23% suffering severe postoperative morbidity.

Functional Bowel Complaints and the Impact on Quality of Life After Colorectal Cancer Surgery in the Elderly

Background

The Low Anterior Resection Syndrome (LARS) is commonly reported after colorectal cancer surgery and significantly impairs quality of life. The prevalence and impact of LARS in the elderly after rectal cancer as well as colon cancer surgery is unclear. We aimed to describe the prevalence of LARS complaints and the impact on quality of life in the elderly after colorectal cancer surgery.

Materials and Methods

Patients were included from seven Dutch hospitals if they were at least one year after they underwent colorectal cancer surgery between 2008 and 2015. Functional bowel complaints were assessed by the LARS score. Quality of life was assessed by the EORTC QLQ-C30 and EORTC QLQ-CR29 questionnaires. Outcomes in patients ≥70 years were compared to a reference group of patients <70 years.

Results

In total 440 rectal cancer and 1183 colon cancer patients were eligible for analyses, of whom 133 (30.2%) rectal and 536 (45.3%) colon cancer patients were ≥70 years. Major LARS was reported by 40.6% of rectal cancer and 22.2% of colon cancer patients ≥70 years. In comparison, patients <70 years reported major LARS in 57.3% after rectal cancer surgery (p=0.001) and in 20.4% after colon cancer surgery (p=0.41). Age ≥70 years was independently associated with reduced rates of major LARS after rectal cancer surgery (OR 0.63, p=0.04). Patients with major LARS reported significantly impaired quality of life on almost all domains.

Conclusion

Elderly should not be withheld a restorative colorectal cancer resection based on age alone. However, a substantial part of the elderly colorectal cancer patients develops major LARS after surgery, which often severely impairs quality of life. Since elderly frequently consider quality of life and functional outcomes as one of the most important outcomes after treatment, major LARS and its impact on quality of life should be incorporated in the decision-making process.

Clinical Utility and Characteristics of the LARS Score Compared to the CCIS

PURPOSE

The low anterior resection syndrome (LARS) score (LS) has been widely validated and has become an international tool for evaluating postoperative bowel dysfunction. However, many physicians still use the conventional incontinence scores in LARS treatment. Moreover, interpretation of LS and its relationship with conventional incontinence scores are not yet well understood. Here we compared the LS with the Cleveland Clinic Incontinence Score (CCIS) to clarify the clinical utility and characteristics of the LARS score.

METHODS

We performed a multicentre observational study, recruiting 246 rectal cancer patients following sphincter-preserving surgery. Patients completed the LS, CCIS, and SF36 questionnaires.

RESULTS

The response rate was 76.4%, and a total of 180 patients were analysed. The LS was strongly correlated with the CCIS (P < 0.001, rs = 0.727). However, among 116 patients determined to not have incontinence (CCIS 0-5), 51 (44%) were diagnosed with LARS (29 with minor LARS and 22 with major LARS). Among 68 patients without LARS, only 3 were diagnosed as having incontinence (CCIS > 6). In comparison with background factors, aging and elapsed time were associated with only LS. High LS and CCIS both showed significant quality-of-life impairment as assessed by the SF-36.

CONCLUSION

This is the first study to determine the difference in the numeric values between the CCIS and LS. The LS can be a convenient tool for LARS screening, identifying a wide range of patients with LARS, including those with incontinence evaluated by CCIS. Assessment using the CCIS may often underestimate LARS.

Functional outcomes after sphincter-preserving surgeries for low-lying rectal cancer: A review

Sphincter preservation and organ restoration during rectal cancer surgery avoids permanent stoma creation and diminishes psychosocial damages. However, decreased rectal volumes and sphincter dysfunction—including pelvic nerve damage—results in low anterior resection syndrome, as well as urinary and sexual dysfunction after rectal resection. Bowel habit changes such as fecal incontinence, fecal urgency, frequent bowel movements, clustered stools, and difficulties in bowel emptying can be treated using medications, pelvic floor rehabilitation, sacral neuromodulation, or neorectal reservoir reconstruction. Pelvic nerve damage resulting from superior and inferior hypogastric plexi during sphincter-preserving rectal cancer surgery can induce urologic and sexual dysfunctions. Preoperative voiding difficulty, perioperative blood loss, and autonomic nerve injury are considered independent risk factors for postoperative urinary dysfunction. Retrograde ejaculation and erectile dysfunction, female dyspareunia, and vaginal dryness are manifestations of sexual dysfunction resulting from autonomic nerve injury during rectal cancer surgery. Multifactorial causes for functional outcomes after sphincter- preserving surgeries are considered to improve patient’s quality of life with acceptable oncologic outcomes in the treatment of rectal cancer patients.

Retrospective study of active drainage in the management of anastomotic leakage after anterior resection for rectal cancer

Objective

Anastomotic leakage (AL) is the most serious postoperative complication following anterior resection for rectal cancer. We aimed to investigate the efficacy of active drainage for the management of AL.

Methods

This was a retrospective study using information from a database of patients who underwent colorectal resection without a defunctioning ileostomy at our center between September 2013 and January 2021. We identified 122 cases with definitive AL who did not require revision emergent laparotomy. Among these patients, we evaluated those who received active drainage to replace the original passive drainage.

Results

There were 62 cases in the active drainage group and 60 cases in the passive drainage group. The active drainage group had a shorter mean AL spontaneous resolution time (26.9 ± 3.3 vs. 32.2 ± 4.8 days) and lower average hospitalization costs (82,680.6 vs. 92,299.3 renminbi (RMB)) compared with the passive drainage group, respectively. Moreover, seven patients in the passive drainage group subsequently underwent diverting stoma to resolve the Al, while all ALs resolved spontaneously after replacing the passive drainage with active drainage.

Conclusions

Our study suggests that active drainage may accelerate the spontaneous resolution of AL.

Defining Anastomotic Leak and the Clinical Relevance of Leaks

Surgeons universally dread gastrointestinal anastomotic leaks, yet the precise definition is not widely agreed on despite international consensus guidelines. Likewise, leaks are not uniformly reported which makes comparisons across studies flawed. Leak rates range from 1 to 3% for ileocolonic, 0.5 to 18% for colorectal, and 5 to 19% for coloanal anastomoses. The sequelae of an anastomotic leak vary but generally correlate with the need for a change in clinical management, from minimal changes to the need for reoperation. Short- and long-term outcomes can be life-altering or life-threatening. Temporary or permanent stomas may be necessary and low pelvic anastomotic leaks may affect bowel function. For cancer patients, leaks can delay treatment and negatively affect oncologic outcomes. In Crohn's patients, leaks are associated with higher recurrence rates. In essence, the lack of agreement on the definition of an anastomotic leak inhibits meaningful understand of its epidemiology, prevention, and treatment.

Assessment of long-term bowel dysfunction after restorative proctectomy for neoplastic disease: A population-based cohort study

BACKGROUND

The purpose of this study was to describe postoperative bowel dysfunction after restorative proctectomy, and to identify factors associated with its development.

METHODS

Patients who underwent restorative proctectomy for rectal cancer between April 1998 and November 2018 were identified from the Hospital Episode Statistics database and linked to the Clinical Practice Research Datalink for postoperative follow-up. Bowel dysfunction was defined according to relevant symptom-based read codes and medication prescription-product codes. A Cox proportional hazards model was performed to identify factors associated with postoperative bowel dysfunction, adjusting for relevant covariates.

RESULTS

In total, 2,197 patients were included. The median age was 70.0 (interquartile range: 62.0-77.0) years old, and the majority (59.2%) of patients were male. After a median follow-up of 51.6 (24.0-90.0) months, bowel dysfunction was identified in 620 (28.2%) patients. Risk factors for postoperative bowel dysfunction included extremes of age (<40 years old: adjusted hazards ratio 2.35, 95% confidence interval 1.18-4.65; 70-79 years old: adjusted hazards ratio 1.25, 95% confidence interval 1.03-1.52), radiotherapy (adjusted hazards ratio 1.94, 95% confidence interval 1.56-2.42), distal tumors (adjusted hazards ratio 1.62, 95% confidence interval 1.34-1.94), history of diverting ostomy (adjusted hazards ratio 1.58, 95% confidence interval 1.33-1.89), and anastomotic leak (adjusted hazards ratio 1.48, 95% confidence interval 1.06-2.05). A minimally invasive surgical approach was protective for postoperative bowel dysfunction (adjusted hazards ratio 0.68, 95% confidence interval 0.53-0.86).

CONCLUSION

Bowel dysfunction was common after restorative proctectomy, and several patient, disease, and treatment-level factors were associated with its development.

Low Anterior Resection Syndrome: Predisposing Factors and Treatment

Bowel dysfunction after restorative proctectomy, commonly referred to as Low Anterior Resection Syndrome (LARS), is a common long-term sequela of rectal cancer treatment that has a significant impact on quality of life. While the pathophysiology of LARS is poorly understood, its underlying cause is likely multifactorial, and there are numerous patient, tumor, and treatment-level factors associated with its development. In accordance with these risk factors, several strategies have been proposed to mitigate LARS postoperatively, including modifications in the technical approach to restorative proctectomy and advancements in the multidisciplinary care of rectal cancer. Furthermore, a clinically applicable pre-operative nomogram has been developed to estimate the risk of LARS postoperatively, which may help in counseling patients before surgery. The management of LARS begins with identifying those who manifest symptoms, as postoperative bowel dysfunction often goes unrecognized. This goal is best achieved with the systematic screening of patients using validated Patient-Reported Outcome Measures. Once a patient with LARS is identified, conservative management strategies should be implemented. When available, a dedicated LARS nurse and/or multidisciplinary team can be an invaluable resource in engaging patients and educating them regarding LARS self-care. If symptoms of LARS persist or worsen over time despite conservative measures, second-line interventions, such as transanal irrigation or pelvic floor rehabilitation, can be initiated. A small proportion of patients will ultimately require an intervention such as sacral neuromodulation or permanent colostomy for refractory, major LARS symptoms.

A nomogram to predict risk factors of frequent defecation early after ileostomy reversal for rectal cancer patients

Background

Defecation disorders after ileostomy reversal are among the most common complications for rectal cancer patients, and significantly diminish their quality of life. The aim of this study was to identify the risk factors associated with frequent defecation early after ileostomy reversal for rectal cancer patients.

Methods

We retrospectively collected the data of rectal cancer patients who underwent ileostomy reversal from January 2018 to December 2019 at the Sixth Affiliated Hospital of Sun Yat-sen University. We divided patients into two groups: a no frequent defecation group (≤7 times/day) and a frequent defecation group (>7 times/day).

Results

Of the 264 included patients, 59 patients (22.35%) had frequent defecation within 1 month after ileostomy closure and were defined as the frequent defecation group. There were no significant differences between the two groups in terms of gender, age, hypertension, and diabetes. Univariate and multivariate analyses showed that proctitis (P=0.04) and anastomotic stenosis (P=0.02) were independent risk factors for frequent defecation. Four factors, including proctitis, anastomotic stenosis, hypertension, and age were included to construct the nomogram. The consistency index of the nomogram was 0.949 and the area under the curve value was 0.623.

Conclusions

For rectal cancer patients, proctitis and anastomotic stenosis were correlated with frequent defecation within 1 month after ileostomy closure. Surgeons should pay attention to the rectal examination before ileostomy reversal surgery.

Anastomotic Leak: Toward an Understanding of Its Root Causes

BACKGROUND

When an anastomotic leak is discussed at a typical surgical morbidity and mortality conference, it is often presented as a due to an error in surgical technique involving ischemia, tension, or device failure. Here we assert that without direct visual analysis of the leak site and its tissue histology, an ex post facto claim that an anastomotic leak is due to an error in surgical technique remains speculative.

METHODS

The arguments and rationale used to conclude that an anastomotic leak is due to an error in surgical technique are critically reviewed and assessed for their validity.

RESULTS

No case series or literature exists in which a root cause analysis has been carried out with visual and tissue level evidence to determine the root cause(s) of an anastomotic leak.

CONCLUSIONS

At the individual case level, declaring that an anastomotic leak is due to an error in surgical technique without clear and compelling evidence either visually and/or at the tissue level to substantiate such a claim remains speculative.

Robotic rectal resection preserves anorectal function: Systematic review and meta-analysis

BACKGROUND

Improving survival rates in rectal cancer patients has generated a growing interest in functional outcomes after total mesorectal excision (TME). The well-established low anterior resection syndrome (LARS) score assesses postoperative anorectal impairment after TME. Our meta-analysis is the first to compare bowel function after open, laparoscopic, transanal, and robotic TME.

METHODS

All studies reporting functional outcomes after rectal cancer surgery (LARS score) were included, and were compared with a consecutive series of robotic TME (n = 48).

RESULTS

Thirty-two publications were identified, including 5 565 patients. Anorectal function recovered significantly better within one year after robotic TME (3.8 [95%CI -9.709-17.309]) versus laparoscopic TME (26.4 [95%CI 19.524-33.286]), p = 0.006), open TME (26.0 [95%CI 24.338-29.702], p = 0.002) and transanal TME (27.9 [95%CI 22.127-33.669], p = 0.003).

CONCLUSIONS

Robotic TME enables better recovery of anorectal function compared to other techniques. Further prospective, high-quality studies are needed to confirm the benefits of robotic surgery.

Risk factors of postoperative low anterior resection syndrome for colorectal cancer: A meta-analysis

The prevalence of postoperative low anterior resection syndrome (LARS) in patients with colorectal cancer is high, which seriously affects the quality of life after operation. The purpose of this meta-analysis is to systematically evaluate the related factors of LARS in patients with colorectal cancer and provide reference for clinicians when making reasoned decisions. A systematic electronic search of PubMed, Embase, The Cochrane Library, WANFANG and CNKI was performed from 2012 to Dec 2020. We analyzed the risk factors of LARS by extracting baseline data and clinical results. The odds ratio (OR) was used to analyze binary variables. A total of 5102 patients were included in 21 literatures, of which the prevalence of LARS was 49.7% (2538/5102). Meta-analysis showed that there was no significant difference in the influence of age (P = 0.48) and sex (P = 0.68) on LARS, but low tumor height (P < 0.001), low anastomotic height (P < 0.001), radiotherapy and chemotherapy (P < 0.001) and postoperative anastomotic leakage (P < 0.001), disfunction stoma (P < 0.001) are high risk factors for the prevalence of LARS. Low tumor height, low anastomotic height, radiotherapy and chemotherapy, anastomotic leakage and disfunction stoma are risk factors for postoperative LARS in patients with colorectal cancer. Clinicians should pay attention to these indicators of patients to provide better clinical intervention for patients and improve their quality of life after operation.