Prediction model and web-based risk calculator for postoperative ileus after loop ileostomy closure

Predictors of complications after prophylactic ileostomy reversal for rectal cancer: A retrospective study

BACKGROUND

Previous studies have analyzed the risk factors for complications after ileostomy reversal for rectal cancer (RC), but there were significant differences in the reported risk factors for complications after stoma reversal. No studies have analyzed the risk factors for stoma-related complications and overall postoperative complications separately.

AIM

To analyze the risk factors for overall complications and stoma-related complications after ileostomy reversal for patients with RC.

METHODS

This was a retrospective study of 439 patients who underwent ileostomy reversal at a clinical center and were followed up between September 2012 and September 2022. Continuous variables are expressed as the mean ± SD and were analyzed with independent-sample t tests, while frequency variables are expressed as n (%), and the χ2 test or Fisher's exact test was used. Univariate and multivariate logistic regression analyses were used to identify predictors of overall complications and stoma-related complications.

RESULTS

The overall complication rate after ileostomy reversal was 11.4%. Patients with lower preoperative albumin concentration (P < 0.01), greater blood loss (P = 0.017), and longer operative times (P < 0.01) were more likely to experience postoperative complications. The incidence of stoma-related complications was 6.4%. Analysis of the study showed that a higher body mass index (BMI) (P < 0.01), preoperative comorbid hypertension (P = 0.049), time from primary surgery to ileostomy reversal (P < 0.01) and longer operation time (P = 0.010) were more likely to result in stoma-related complications postoperatively. Multivariate logistic regression analysis revealed that a lower preoperative albumin level (P < 0.01, OR = 0.888, 95%CI: 0.828-0.958) was an independent risk factor for overall complications. Moreover, multivariate analysis revealed that BMI (P < 0.01, OR = 1.176, 95%CI: 1.041-1.330) and time from primary surgery to ileostomy reversal (P < 0.01, OR = 1.140, 95%CI: 1.038-1.252) were independent risk factors for stoma-related complications after stoma reversal.

CONCLUSION

The preoperative albumin level was a predictor of overall complications. Preoperative BMI and the time from primary surgery to ileostomy reversal were predictors of stoma-related complications.

Diverting ileostomy in benign colorectal surgery: the real clinical cost analysis

There are three types of complications stoma related: ones related to its construction, ones related to its function and related to closure. The aim of this study was to assess the risk of complications related to the stoma presence and to identificate variables related to complications. We conducted a retrospective study of patients who underwent sphincter-preserving elective surgery for benign condition between January 2013 and December 2020 at IRCCS Sacro Cuore Don Calabria Hospital in Negrar, Verona. Data were collected regarding demographics and complications associated with primary surgery, stoma closure and the interval period. Univariable and multivariable analysIs were conducted. A total of 446 (12.2%) diverting loop ileostomies were performed. At index procedure, 76 (17%) patients had complications and 34 patients had complications related to ileostomy creation. Twenty patients (4.4%) were re admitted before stoma closure for dehydration. One hundred and eighty-seven patients (41.9%) suffered from ileostomy management's problems. At univariate analysis, complications of having stoma are more frequent in elder patients (p = 0.013), ASA score > 2 (p = 0.02), IBD diagnosis (p = < 0.001) and patients who had ileostomy creation complications (p = 0.04). At stoma closure, 55 (12.3%) patients had complications. Forty-seven patients (10.5%) presented incisional hernia in the stoma closure site. Ileostomy closure complications are more common with ASA score > 2 (p = 0.01) and IBD diagnosis (p < 0.001). IBD was found an independent factor of poor outcome at the time of ileostomy creation and closure. Developing complications at the time of ileostomy creation is statistically related to develop complications during ileostomy maintenance at multivariable analysis A loop ileostomy is usually created to limit the potentially life-threatening consequenceS of anastomotic leakage, but it is not able to decrease the leak-related mortality, wound sepsis, postoperative bleeding and small bowel obstruction. Debate rises not only for its uncertain efficacy but also because of the significant morbidity related to stoma. The surgeon could use these data in order to tailor his surgical strategy to the patients and their disease.

Risk prediction algorithms for prolonged postoperative ileus: A systematic review

AIM

Prolonged postoperative ileus (PPOI) is common and is associated with a significant healthcare burden. Previous studies have attempted to predict PPOI clinically using risk prediction algorithms. The aim of this work was to systematically review and compare risk prediction algorithms for PPOI following colorectal surgery.

METHOD

A systematic literature search was conducted using MEDLINE, Embase, Web of Science and CINAHL Plus. Studies that developed and/or validated a risk prediction algorithm for PPOI in adults following colorectal surgery were included. Data were collected on study design, population and operative characteristics, the definition of PPOI used and risk prediction algorithm design and performance. Quality appraisal was assessed using the PROBAST tool.

RESULTS

Eleven studies with 87 549 participants were included in our review. Most were retrospective, single-centre analyses (6/11, 55%) and rates of PPOI varied from 10% to 28%. The most commonly used variables were sex (8/11, 73%), age (6/11, 55%) and surgical approach (5/11, 45%). Area under the curve ranged from 0.68-0.78, and only three models were validated. However, there was significant variation in the definition of PPOI used. No study reported sensitivity, specificity or positive/negative predictive values.

CONCLUSION

Currently available risk prediction algorithms for PPOI appear to discriminate moderately well, although there is a lack of validation data. Future studies should aim to use a standardized definition of PPOI, comprehensively report model performance and validate their findings using internal and external methodologies.

Revolutionizing Postoperative Ileus Monitoring: Exploring GRU-D's Real-Time Capabilities and Cross-Hospital Transferability

Background

Postoperative ileus (POI) after colorectal surgery leads to increased morbidity, costs, and hospital stays. Identifying POI risk for early intervention is important for improving surgical outcomes especially given the increasing trend towards early discharge after surgery. While existing studies have assessed POI risk with regression models, the role of deep learning's remains unexplored.

Methods

We assessed the performance and transferability (brutal force/instance/parameter transfer) of Gated Recurrent Unit with Decay (GRU-D), a longitudinal deep learning architecture, for real-time risk assessment of POI among 7,349 colorectal surgeries performed across three hospital sites operated by Mayo Clinic with two electronic health records (EHR) systems. The results were compared with atemporal models on a panel of benchmark metrics.

Results

GRU-D exhibits robust transferability across different EHR systems and hospital sites, showing enhanced performance by integrating new measurements, even amid the extreme sparsity of real-world longitudinal data. On average, for labs, vitals, and assisted living status, 72.2%, 26.9%, and 49.3% respectively lack measurements within 24 hours after surgery. Over the follow-up period with 4-hour intervals, 98.7%, 84%, and 95.8% of data points are missing, respectively. A maximum of 5% decrease in AUROC was observed in brutal-force transfer between different EHR systems with non-overlapping surgery date frames. Multi-source instance transfer witnessed the best performance, with a maximum of 2.6% improvement in AUROC over local learning. The significant benefit, however, lies in the reduction of variance (a maximum of 86% decrease). The GRU-D model's performance mainly depends on the prediction task's difficulty, especially the case prevalence rate. Whereas the impact of training data and transfer strategy is less crucial, underscoring the challenge of effectively leveraging transfer learning for rare outcomes. While atemporal Logit models show notably superior performance at certain pre-surgical points, their performance fluctuate significantly and generally underperform GRU-D in post-surgical hours.

Conclusion

GRU-D demonstrated robust transferability across EHR systems and hospital sites with highly sparse real-world EHR data. Further research on built-in explainability for meaningful intervention would be highly valuable for its integration into clinical practice.

Protective ileostomy creation after anterior resection of the rectum: Shared decision-making or still subjective?

AIM

The choice of whether to perform protective ileostomy (PI) after anterior resection (AR) is mainly guided by risk factors (RFs) responsible for the development of anastomotic leakage (AL). However, clear guidelines about PI creation are still lacking in the literature and this is often decided according to the surgeon's preferences, experiences or feelings. This qualitative study aims to investigate, by an open-ended question survey, the individual surgeon's decision-making process regarding PI creation after elective AR.

METHOD

Fifty four colorectal surgeons took part in an electronic survey to answer the questions and describe what usually led their decision to perform PI. A content analysis was used to code the answers. To classify answers, five dichotomous categories (In favour/Against PI, Listed/Unlisted RFs, Typical/Atypical, Emotions/Non-emotions, Personal experience/No personal experience) have been developed.

RESULTS

Overall, 76% of surgeons were in favour of PI creation and 88% considered listed RFs in the question of whether to perform PI. Atypical answers were reported in 10% of cases. Emotions and personal experience influenced surgeons' decision-making process in 22% and 49% of cases, respectively. The most frequently considered RFs were the distance of the anastomosis from the anal verge (96%), neoadjuvant chemoradiotherapy (88%), a positive intraoperative leak test (65%), blood loss (37%) and immunosuppression therapy (35%).

CONCLUSION

The indications to perform PI following rectal cancer surgery lack standardization and evidence-based guidelines are required to inform practice. Until then, expert opinion can be helpful to assist the decision-making process in patients who have undergone AR for adenocarcinoma.

Bowel stimulation before loop ileostomy closure to reduce postoperative ileus: a multicenter, single-blinded, randomized controlled trial

Introduction

The objective of this study was to evaluate the impact of preoperative bowel stimulation on the development of postoperative ileus (POI) after loop ileostomy closure.

Methods

This was a multicenter, randomized controlled trial (NCT025596350) including adult (≥ 18 years old) patients who underwent elective loop ileostomy closure at 7 participating hospitals. Participants were randomly assigned (1:1) using a centralized computer-generated sequence with block randomization to either preoperative bowel stimulation or no stimulation (control group). Bowel stimulation consisted of 10 outpatient sessions within the 3 weeks prior to ileostomy closure and was performed by trained Enterostomal Therapy nurses. The primary outcome was POI, defined as an intolerance to oral food in the absence of clinical or radiological signs of obstruction, on or after postoperative day 3, that either (a) required nasogastric tube insertion; or (b) was associated with two of the following: nausea/vomiting, abdominal distension, or the absence of flatus.

Results

Between January 2017 and November 2020, 101 patients were randomized, and 5 patients never underwent ileostomy closure; thus, 96 patients (47 stimulated vs. 49 control) were analyzed according to a modified intention-to-treat protocol. Baseline characteristics were well balanced in both groups. The incidence of POI was lower among patients randomized to stimulation (6.4% vs. 24.5%, p = 0.034; unadjusted RR: 0.26, 95% CI 0.078–0.87). Stimulated patients also had earlier median time to first flatus (2.0 days (1.0–2.0) vs. 2.0 days (2.0–3.0), p = 0.025), were more likely to pass flatus on postoperative day 1 (46.8% vs. 22.4%, p = 0.022), and had a shorter median postoperative hospital stay (3.0 days (2.0–3.5) vs. 4.0 days (2.0–6.0), p = 0.003).

Conclusions

Preoperative bowel stimulation via the efferent limb of the ileostomy reduced POI after elective loop ileostomy closure.

Supplementary Information

The online version contains supplementary material available at 10.1007/s00464-022-09510-5.

Risk factors for postoperative ileus after diverting loop ileostomy closure

BACKGROUND

Postoperative ileus is one of the most common complications after diverting loop ileostomy closure. Some reports have investigated the risk factors for postoperative complications or ileus after ileostomy closure; however, these studies did not evaluate the index surgery sufficiently. In this study, we evaluated the risk factors, including the details of the index surgery, for ileus after diverting ileostomy closure.

METHODS

This was a retrospective study of patients who underwent ileostomy closure following index surgery for rectal cancer. Patients who developed postoperative ileus [POI (+)] and patients who did not [POI (-)] after ileostomy closure were compared.

RESULTS

Sixty-eight patients were evaluated and were divided into two groups: POI (+) (n = 11) and POI (-) (n = 57), and the groups were compared. There were no significant differences in the details of the index surgery, operative procedure, transanal total mesorectal excision, lateral lymph node dissection, operating time, or blood loss. The incidence of Clavien-Dindo grade ≥ III complications and adjuvant chemotherapy after index surgery were significantly higher in the POI (+) group.

CONCLUSIONS

The incidence of Clavien-Dindo grade ≥ III complications and adjuvant chemotherapy after index surgery may increase the risk of postoperative ileus after ileostomy closure.

Self-administered succus entericus reinfusion before ileostomy closure improves short-term outcomes

OBJECTIVE

The study aims to assess whether reinfusion of succus entericus prior to ileostomy closure can decrease postoperative length of stay and ameliorate low anterior resection score.

METHODS

This study is a retrospective analysis based on prospectively collected data. Patients were screened from May 2016 to November 2019. A total of 30 patients who underwent reinfusion with succus entericus (SER) were enrolled in the SER group and 42 patients without SER were enrolled in the non-SER group.

RESULTS

There was no significant difference in the incidence of postoperative ileus between succus entericus reinfusion (SER) group and the control group. Time to first passage of flatus or stool after surgery in the SER group (27.9 ± 6.02 h) is significantly shorter than the control group (32.3 ± 6.26, hours p = 0.004). Compared with the control group (5.52 (4.0-7.0) days), postoperative length of stay in the SER group was 4.90 (3.0-7.0)days (p = 0.009). As for low anterior resection score(LARS), the SER group had a lower score 1 week after discharge than the control group (p = 0.034). However, 1 month after discharge, the LARS in the two groups had no significant difference.

CONCLUSIONS

Self-administered succus entericus reinfusion is a feasible prehabilitation management for outpatients and can improve better outcomes. Compared with non-reinfusion group, succus enterius reinfusion group displays significantly shorter time for gastrointestinal function recovery and postoperative hospital stay without increasing complication, and it can bring better quality of life in a short term.

Loop ileostomy in rectal cancer surgery: factors predicting reversal and stoma related morbidity

PURPOSE

Loop ileostomy is performed in rectal cancer surgery to decrease the impact of anastomotic leak but it is associated with a significant complication rate. This study aimed to analyze the morbidity related to diverting ileostomy and to identify factors predictive of complications related to stoma management and reversal, as well as conversion into a permanent ileostomy.

METHODS

A retrospective study was conducted on 112 patients submitted to oncological rectal resection and defunctioning ileostomy in a Portuguese colorectal unit between March 2012 and March 2019.

RESULTS

Loop ileostomy was responsible for 13% of index surgery morbidity and 15% of patients' readmissions due to high output, stoma stenosis and parastomal hernia. Ileostomy was reversed in 89% cases with 7% Clavien-Dindo ≥ IIIb complications. An association was established between diabetes and higher stoma management morbidity (OR: 3.28 [95% CI: 1.039-10.426]. p = 0.041). Likewise, diabetes (OR: 0.17 [95% CI: 0.038; 6.90], p=0.015), oncological disease stage ≥ III (OR: 0.10 [95% CI: 0.005; 0.656], p=0.047) and index rectal surgery morbidity (OR: 0.23 [95% CI: 0.052; 0.955], p=0.041) were associated with less ileostomy closure. Complications of the index surgery also related to higher stoma reversal morbidity (OR: 5.11 [95% CI: 1.665; 16.346], p=0.005).

CONCLUSIONS

Diabetes and complications of index rectal surgery were identified as predictive of ileostomy morbidity, closure rate and associated complications. It is essential to adjust treatment decisions to patient's morbidity risk and adopt a more selective approach concerning the use of an ileostomy.