Annals of Coloproctology

Original Articles

The impact of short-course total neoadjuvant therapy, long-course chemoradiotherapy, and upfront surgery on the technical difficulty of total mesorectal excision: an observational study with an intraoperative perspective: Cheryl Xi-Zi Chong, Frederick H. Koh, Hui-Lin Tan, Sharmini Su Sivarajah, Jia-Lin Ng, Leonard Ming-Li Ho, Darius Kang-Lie Aw, Wen-Hsin Koo, Shuting Han, Si-Lin Koo, Connie Siew-Poh Yip, Fu-Qiang Wang, Fung-Joon Foo, Winson Jianhong Tan; Received December 27, 2023 Accepted March 31, 2024 Published online September 19, 2024; DOI: https://doi.org/10.3393/ac.2023.00899.0128 [Epub ahead of print]

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Abstract PDF Supplementary Material: Purpose
Total neoadjuvant therapy (TNT) is becoming the standard of care for locally advanced rectal cancer. However, surgery is deferred for months after completion, which may lead to fibrosis and increased surgical difficulty. The aim of this study was to assess whether TNT (TNT-RAPIDO) is associated with increased difficulty of total mesorectal excision (TME) compared with long-course chemoradiotherapy (LCRT) and upfront surgery.
Methods
Twelve laparoscopic videos of low anterior resection with TME for rectal cancer were prospectively collected from January 2020 to October 2021, with 4 videos in each arm. Seven colorectal surgeons assessed the videos independently, graded the difficulty of TME using a visual analog scale and attempted to identify which category the videos belonged to.
Results
The median age was 67 years, and 10 patients were male. The median interval to surgery from radiotherapy was 13 weeks in the LCRT group and 24 weeks in the TNT-RAPIDO group. There was no significant difference in the visual analog scale for difficulty in TME between the 3 groups (LCRT, 3.2; TNT-RAPIDO, 4.6; upfront, 4.1; P=0.12). A subgroup analysis showed similar difficulty between groups (LCRT 3.2 vs. TNT-RAPIDO 4.6, P=0.05; TNT-RAPIDO 4.6 vs. upfront 4.1, P=0.54). During video assessments, surgeons correctly identified the prior treatment modality in 42% of the cases. TNT-RAPIDO videos had the highest recognition rate (71%), significantly outperforming both LCRT (29%) and upfront surgery (25%, P=0.01).
Conclusion
TNT does not appear to increase the surgical difficulty of TME.

Colonic stenting: is the bridge to surgery worth its cost? A cost-effectiveness analysis at a single Asian institution: Michelle Shi Qing Khoo, Frederick H. Koh, Sharmini Su Sivarajah, Leonard Ming-Li Ho, Darius Kang-Lie Aw, Cheryl Xi-Zi Chong, Fung Joon Foo, Winson Jianhong Tan; Received October 28, 2023 Accepted December 12, 2023 Published online August 5, 2024; DOI: https://doi.org/10.3393/ac.2023.00738.0105 [Epub ahead of print]

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Abstract PDF: Purpose
In patients with acute left-sided colonic obstruction, stenting can convert an emergency operation into a semi-elective procedure. However, its use continues to be debated. We performed a cost-effective analysis using our institution’s experiences.
Methods
Endoscopic, surgical, and financial details were prospectively collected for patients who presented with acute colonic obstruction and underwent stenting between 2019 and 2022. Outcomes were defined as technical/clinical success and successful surgical resection. The financial cost of stenting was compared with the expected cost without stenting.
Results
Forty patients were included, with 29 undergoing definitive resection. The most common pathology was primary colon cancer (27 patients, 93%). Endoscopic stenting had high technical (90%) and clinical (83%) success rates, with low rates of complications such as perforation (2 patients, 7%) and migration (0 patients, 0%). As a bridge to surgery, the median procedure time was 226 minutes and the surgical outcomes also showed a low rate of complications (3 patients, 11%), such as anastomotic leakage (0 patients, 0%), intraabdominal abscesses (2 patients, 7%), and 30-day postoperative mortality (0 patients, 0%). The cumulative costs with colonic stenting were $32,900, while the expected costs with emergency surgery, including stoma reversal, were $40,700 (healthcare cost-savings of $7,800 per person). The difference was mainly due to the avoidance of upfront emergency surgery. The incremental cost-effectiveness ratio was 0.81, favoring colonic stenting over upfront emergency surgery.
Conclusion
Colonic stenting as a bridge to surgery is safe and cost-effective for treating left-sided colonic obstruction with high success rates and low complication rates.

Reviews

Benign bowel disease

Multimodal prerehabilitation for elderly patients with sarcopenia in colorectal surgery: Jingting Wu, Hannah Chi, Shawn Kok, Jason M.W. Chua, Xi-Xiao Huang, Shipin Zhang, Shimin Mah, Li-Xin Foo, Hui-Yee Peh, Hui-Bing Lee, Phoebe Tay, Cherie Tong, Jasmine Ladlad, Cheryl H.M. Tan, Nathanelle Khoo, Darius Aw, Cheryl X.Z. Chong, Leonard M.L. Ho, Sharmini S. Sivarajah, Jialin Ng, Winson J.H. Tan, Fung-Joon Foo, Bin-Tean Teh, Frederick H. Koh; Ann Coloproctol. 2024;40(1):3-12. Published online March 31, 2023; DOI: https://doi.org/10.3393/ac.2022.01207.0172

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9 Web of Science
11 Citations

Abstract PDF

Sarcopenia, which is characterized by progressive and generalized loss of skeletal muscle mass and strength, has been well described to be associated with numerous poor postoperative outcomes, such as increased perioperative mortality, postoperative sepsis, prolonged length of stay, increased cost of care, decreased functional outcome, and poorer oncological outcomes in cancer surgery. Multimodal prehabilitation, as a concept that involves boosting and optimizing the preoperative condition of a patient prior to the upcoming stressors of a surgical procedure, has the purported benefits of reversing the effects of sarcopenia, shortening hospitalization, improving the rate of return to bowel activity, reducing the costs of hospitalization, and improving quality of life. This review aims to present the current literature surrounding the concept of sarcopenia, its implications pertaining to colorectal cancer and surgery, a summary of studied multimodal prehabilitation interventions, and potential future advances in the management of sarcopenia.

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Differences in Functional Capacity between Oncologic and Non-Oncologic Populations: Reference Values
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Get Fit: Muscle Health for Crohn’s Disease Surgical Outcome Optimization
Sara Massironi, Pierpaolo Sileri, Silvio Danese
Inflammatory Bowel Diseases.2023;[Epub] CrossRef
Recommendations on the use of prehabilitation, i.e. comprehensive preparation of the patient for surgery
Tomasz Banasiewicz, Jarosław Kobiela, Jarosław Cwaliński, Piotr Spychalski, Patrycja Przybylska, Karolina Kornacka, Dagmara Bogdanowska-Charkiewicz, Magdalena Leyk-Kolańczak, Maciej Borejsza-Wysocki, Dominika Batycka-Stachnik, Rafał Drwiła
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AI colonoscopy

The imitation game: a review of the use of artificial intelligence in colonoscopy, and endoscopists’ perceptions thereof: Sarah Tham, Frederick H. Koh, Jasmine Ladlad, Koy-Min Chue, SKH Endoscopy Centre, Cui-Li Lin, Eng-Kiong Teo, Fung-Joon Foo; Ann Coloproctol. 2023;39(5):385-394. Published online March 10, 2023; DOI: https://doi.org/10.3393/ac.2022.00878.0125

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Abstract PDF: The development of deep learning systems in artificial intelligence (AI) has enabled advances in endoscopy, and AI-aided colonoscopy has recently been ushered into clinical practice as a clinical decision-support tool. This has enabled real-time AI-aided detection of polyps with a higher sensitivity than the average endoscopist, and evidence to support its use has been promising thus far. This review article provides a summary of currently published data relating to AI-aided colonoscopy, discusses current clinical applications, and introduces ongoing research directions. We also explore endoscopists’ perceptions and attitudes toward the use of this technology, and discuss factors influencing its uptake in clinical practice.

Brief Communication

Malignant disease, Special issue

Safe Colorectal Surgery in the COVID-19 Era – A Singapore Experience: Winson Jianhong Tan, Fung Joon Foo, Sharmini Su Sivarajah, Leonard Ho Ming Li, Frederick H Koh, Min Hoe Chew; Ann Coloproctol. 2020;36(2):65-69. Published online April 30, 2020; DOI: https://doi.org/10.3393/ac.2020.04.21

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10 Web of Science
11 Citations

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Did the COVID-19 lockdown result in a delay of colorectal cancer presentation and outcomes? A single centre review
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Original Article

Laparoscopic Versus an Open Colectomy in an Emergency Setting: A Case-Controlled Study: Frederick H. Koh, Ker-Kan Tan, Charles B. Tsang, Dean C. Koh; Ann Coloproctol. 2013;29(1):12-16. Published online February 28, 2013; DOI: https://doi.org/10.3393/ac.2013.29.1.12

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21 Citations

Abstract PDF

Purpose

Laparoscopy continues to be increasingly adopted for elective colorectal resections. However, its role in an emergency setting remains controversial. The aim of this study was to compare the outcomes between laparoscopic and open colectomies performed for emergency colorectal conditions.

Methods

A retrospective review of all patients who underwent emergency laparoscopic colectomies for various surgical conditions was performed. These patients were matched for age, gender, surgical diagnosis and type of surgery with patients who underwent emergency open colectomies.

Results

Twenty-three emergency laparoscopic colectomies were performed from April 2006 to October 2011 for patients with lower gastrointestinal tract bleeding (6), colonic obstruction (4) and colonic perforation (13). The hand-assisted laparoscopic technique was utilized in 15 cases (65.2%). There were 4 (17.4%) conversions to the open technique. The operative time was longer in the laparoscopic group (175 minutes vs. 145 minutes, P = 0.04), and the duration of hospitalization was shorter in the laparoscopic group (6 days vs. 7 days, P = 0.15). The overall postoperative morbidity rates were similar between the two groups (P = 0.93), with only 3 patients in each group requiring postoperative surgical intensive-care-unit stays or reoperations. There were no mortalities. The cost analysis did not demonstrate any significant differences in the procedural (P = 0.57) and the nonprocedural costs (P = 0.48) between the two groups.

Conclusion

Emergency laparoscopic colectomy in a carefully-selected patient group is safe. Although the operative times were longer, the postoperative outcomes were comparable to those of the open technique. The laparoscopic group did not incur a higher cost.

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