Clinical Endoscopy

Mechanism of action and selection of endoscopic bariatric therapies for treatment of obesity: Wissam Ghusn, Gerardo Calderon, Barham K. Abu Dayyeh, Andres Acosta; Clin Endosc 2024;57(6):701-710. Published online August 29, 2024; DOI: https://doi.org/10.5946/ce.2024.005

Abstract PDF PubReader ePub: Endoscopic bariatric therapies (EBTs) are minimally invasive and safe procedures with favorable weight loss outcomes in obesity treatment. We aimed to present the weight loss mechanism of action of EBTs and an individualized selection method for patients with obesity. We searched PubMed, Medline, Scopus, Embase, and Google Scholar databases for studies on the topic from databases inception to July 1, 2023, written in English. We focused on EBTs potential mechanism of action to induce weight loss. We also present an expert opinion on a novel selection of EBTs based on their mechanism of action. EBTs can result in weight loss through variable mechanisms of action. They can induce earlier satiation, delay gastric emptying, restrict the accommodative response of the stomach, decrease caloric absorption, and alter the secretion of gastrointestinal hormones. Selecting EBTs may be guided through their mechanism of action by which patients with abnormal satiation may benefit more from tissue apposition devices and aspiration therapy while patients with fast gastric emptying may be better candidates for intragastric devices, endoscopic anastomosis devices, and duodenal mucosal resurfacing. Consequently, the selection of EBTs should be guided by the mechanism of action which is specific to each type of therapy.

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The evolution and current state of bariatric endoscopy in Western countries: Maria Valeria Matteo, Vincenzo Bove, Valerio Pontecorvi, Loredana Gualtieri, Giorgio Carlino, Cristiano Spada, Ivo Boškoski; Clin Endosc 2024;57(6):711-724. Published online May 24, 2024; DOI: https://doi.org/10.5946/ce.2023.253

Abstract PDF PubReader ePub: With the alarmingly increasing prevalence of obesity in the Western world, it has become necessary to provide more acceptable treatment options for patients with obesity. Minimally invasive endoscopic techniques are continuously evolving. Currently, metabolic and bariatric endoscopies encompass several different techniques that can offer significant weight loss and improvement in comorbidities with a favorable safety profile. Restrictive bariatric procedures include the use of intragastric balloons and gastric remodeling techniques with different suturing devices. Several studies have demonstrated the efficacy and safety of these techniques that are widely used in clinical practice. Small intestine-targeted metabolic endoscopy is an intriguing and rapidly evolving field of research, although it is not widespread in routine practice. These techniques include duodenal-jejunal bypass liners, duodenal mucosal resurfacing, and incisionless anastomoses. The aim of this review article is to provide a detailed update on the currently available bariatric endoscopy techniques in Western countries.

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Endoscopic findings of immune checkpoint inhibitor-related gastrointestinal adverse events: Min Kyu Kim, Sung Wook Hwang; Clin Endosc 2024;57(6):725-734. Published online August 29, 2024; DOI: https://doi.org/10.5946/ce.2024.003

Abstract PDF PubReader ePub: The use of immune checkpoint inhibitors (ICIs) for the treatment of various malignancies is increasing. Immune-related adverse events can occur after ICI administration, with gastrointestinal adverse events constituting a significant proportion of these events. When ICI-related diarrhea/colitis is suspected, endoscopic evaluation is recommended to differentiate it from other etiologies and assess the severity of colitis. The distribution of intestinal inflammation in ICI-related colitis demonstrates a high frequency of extensive colitis (23–86%). However, isolated right-sided colitis (3–8%) and ileitis (2–16%) are less prevalent. Endoscopic findings vary and predominantly encompass features indicative of inflammatory bowel disease, including aphthae, ulcers, diffuse or patchy erythema, mucosal edema, loss of vascular pattern, and friability. The presence of ulcers and extensive intestinal inflammation are associated with a reduced response to treatment. Microscopic inflammation can be observed even in endoscopically normal mucosa, underscoring the need for biopsies of seemingly normal mucosa. Histological findings present with acute/chronic inflammation and occasionally exhibit characteristics observed in inflammatory bowel disease, microscopic colitis, or ischemic colitis. The first-line therapeutic choice for ICI-related diarrhea/colitis with a common terminology criteria for adverse events grade of 2 or above is corticosteroids, whereas infliximab and vedolizumab are recommended for refractory cases.

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Drainage for fluid collections post pancreatic surgery and acute pancreatitis: similar but different?: Yousuke Nakai, Saburo Matsubara, Tsuyoshi Mukai, Tsuyoshi Hamada, Takashi Sasaki, Hirotoshi Ishiwatari, Susumu Hijioka, Hideyuki Shiomi, Mamoru Takenaka, Takuji Iwashita, Atsuhiro Masuda, Tomotaka Saito, Hiroyuki Isayama, Ichiro Yasuda, for the WONDERFUL study group in Japan; Clin Endosc 2024;57(6):735-746. Published online May 17, 2024; DOI: https://doi.org/10.5946/ce.2023.254

Abstract PDF PubReader ePub: Postoperative pancreatic fistulas (POPFs) are common adverse events that occur after pancreatic surgery. Endoscopic ultrasonography (EUS)-guided drainage (EUS-D) is a first-line treatment, similar to that for pancreatic fluid collection (PFCs) after acute pancreatitis. However, some POPFs do not develop fluid collections depending on the presence or location of the surgical drain, whereas others develop fluid collections, such as postoperative fluid collections (POPFCs). Although POPFCs are similar to PFCs, the strategy and modality for POPF management need to be modified according to the presence of fluid collections, surgical drains, and surgical type. As discussed for PFCs, the indications, timing, and selection of interventions or stents for EUS-D have not been fully elucidated for POPFs. In this review, we discuss the management of POPFs and POPFCs in comparison with PFCs due to acute pancreatitis and summarize the topics that should be addressed in future studies.

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Cold snare polypectomy versus cold endoscopic mucosal resection for small colorectal polyps: a meta-analysis of randomized controlled trials: Vishali Moond, Priyadarshini Loganathan, Sheza Malik, Dushyant Singh Dahiya, Babu P. Mohan, Daryl Ramai, Michele McGinnis, Deepak Madhu, Mohammad Bilal, Aasma Shaukat, Saurabh Chandan; Clin Endosc 2024;57(6):747-758. Published online August 23, 2024; DOI: https://doi.org/10.5946/ce.2024.081 [Epub ahead of print]

Graphical Abstract Abstract PDF Supplementary Material PubReader ePub: Background
/Aims: Cold snare polypectomy (CSP) is routinely performed for small colorectal polyps (≤10 mm). However, challenges include insufficient resection depth and immediate bleeding, hindering precise pathological evaluation. We aimed to compare the outcomes of cold endoscopic mucosal resection (CEMR) with that of CSP for colorectal polyps ≤10 mm, using data from randomized controlled trials (RCTs).
Methods
Multiple databases were searched in December 2023 for RCTs reporting outcomes of CSP versus CEMR for colorectal polyps ≤10 mm in size. Our primary outcomes were rates of complete and en-bloc resections, while our secondary outcomes were total resection time (seconds) and adverse events, including immediate bleeding, delayed bleeding, and perforation.
Results
The complete resection rates did not significantly differ (CSP, 91.8% vs. CEMR 94.6%), nor did the rates of en-bloc resection (CSP, 98.9% vs. CEMR, 98.3%) or incomplete resection (CSP, 6.7% vs. CEMR, 4.8%). Adverse event rates were similarly insignificant in variance. However, CEMR had a notably longer mean resection time (133.51 vs. 91.30 seconds).
Conclusions
Our meta-analysis of seven RCTs showed that while both CSP and CEMR are equally safe and effective for resecting small (≤10 mm) colorectal polyps, the latter is associated with a longer resection time.

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Revolutionizing gastrointestinal endoscopy: the emerging role of large language models: Eun Jeong Gong, Chang Seok Bang; Clin Endosc 2024;57(6):759-762. Published online August 29, 2024; DOI: https://doi.org/10.5946/ce.2024.039

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Risk of Barrett’s esophagus progression to esophageal adenocarcinoma: Lahari Kota, Amy Tyberg; Clin Endosc 2024;57(6):763-764. Published online November 25, 2024; DOI: https://doi.org/10.5946/ce.2024.273

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Understanding the discrepancy in the effectiveness of artificial intelligence-assisted colonoscopy: from randomized controlled trials to clinical reality: Jung Ho Bae; Clin Endosc 2024;57(6):765-767. Published online November 25, 2024; DOI: https://doi.org/10.5946/ce.2024.226

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Progression to cancer in patients with confirmed dysplasia compared to dysplasia downgraded to non-dysplastic metaplasia in Barrett’s esophagus: a retrospective cohort study in Sweden: Peter Elbe, Åke Öst, Lennart Mellbom, Anders Thorell, Bengt Håkanson, Fredrik Klevebro, Mats Lindblad; Clin Endosc 2024;57(6):768-774. Published online November 25, 2024; DOI: https://doi.org/10.5946/ce.2023.313

Graphical Abstract Abstract PDF PubReader ePub: Background
/Aims: This study aimed to clarify the risk of progression in patients with non-dysplastic Barrett’s esophagus (NDBE) and patients with confirmed low-grade dysplasia (LGD) and indefinite for dysplasia (IND) after an expert pathologist review of patients with BE with suspected dysplasia in a prospective cohort.
Methods
Patients with Barrett’s esophagus diagnosed with dysplasia at Ersta Hospital in Stockholm from 1998 to 2012 were included. The first dysplastic specimen in all patients was re-evaluated by two expert pathologists and classified as NDBE, LGD, IND, or cancer, including high-grade dysplasia. The incidence rates (IRs) and IR ratios were calculated with 95% confidence intervals.
Results
Of 423 patients with Barrett’s esophagus with dysplasia, 266 (62.9%) were re-classified as NDBE, 83 (19.6%) had LGD, 71 (16.8%) had IND, and 3 (0.7%) patients had cancer. During the follow-up, 34 (8%) patients developed cancer, most of them within five years, while others progressed after up to 25 years of surveillance. IRs for cancer among patients with NDBE was 0.41%/year compared to 1.84%/year for LGD (p<0.001) and 1.43%/year for IND (p=0.008).
Conclusions
Long-term risk of progression to cancer did not differ between patients with confirmed LGD and IND. These findings suggest that patients with IND should undergo similar management as patients with LGD.

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Novel regimen for colonoscopy bowel preparation with oral lactulose: a prospective comparative study: Josué Aliaga Ramos, Danilo Carvalho, Vitor N. Arantes; Clin Endosc 2024;57(6):775-782. Published online October 22, 2024; DOI: https://doi.org/10.5946/ce.2024.056

Graphical Abstract Abstract PDF PubReader ePub: Background
/Aims: Polyethylene glycol (PEG) is considered the gold standard regimen for bowel preparation; however, due to the necessity of a large volume, patient tolerance is impaired. Therefore, lactulose is a novel alternative for colonoscopy preparation. This study aimed to investigate the efficacy and safety of lactulose-based bowel preparations in comparison with PEG for colonoscopy.
Methods
This is a prospective, non-blinded, comparative study. Outpatients were randomly divided into two groups: group 1 (111 patients), PEG; and group 2 (111 patients), lactulose. The following clinical outcomes were assessed in each group: degree of bowel clearance using the Boston bowel preparation score, colorectal polyp detection rate, adenoma detection rate, tolerability, and side effects.
Results
The rate of inadequate bowel preparation was 8.1% and 1.8% for the PEG and lactulose groups, respectively (p=0.030). The Boston bowel preparation score for the entire colon was 7.34±1.17 and 8.36±1.09 for the PEG and lactulose groups, respectively (p<0.001). The satisfactory overall experience rates were 27.9% and 62.2% for the PEG and lactulose groups, respectively (p<0.001).
Conclusions
The novel bowel preparation with oral lactulose was superior to that with PEG in terms of colon cleansing, adenoma detection rate, tolerance, and patient experience.

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Assessing the potential of artificial intelligence to enhance colonoscopy adenoma detection in clinical practice: a prospective observational trial: Søren Nicolaj Rønborg, Suresh Ujjal, Rasmus Kroijer, Magnus Ploug; Clin Endosc 2024;57(6):783-789. Published online August 23, 2024; DOI: https://doi.org/10.5946/ce.2024.038

Graphical Abstract Abstract PDF PubReader ePub

Background
/Aims: This study aimed to evaluate the effectiveness of the GI Genius (Medtronic) module in clinical practice, focusing on the adenoma detection rate (ADR) during colonoscopy. Computer-aided polyp detection (CADe) systems using artificial intelligence have been shown to improve adenoma detection in controlled trials. However, the effectiveness of these systems in clinical practice has recently been questioned.
Methods
This single-center prospective observational study was conducted at the University Hospital of Southern Denmark and included all individuals referred for colonoscopy between November 2020 and January 2021. The primary outcome was ADR, comparing patients examined with CADe to those examined without it. The selection of patients to be examined with the CADe module was completely random.
Results
A total of 502 patients were analyzed (318 in the control group and 184 in the CADe group). The overall ADR was 32.1% with a slight increase in the CADe group (34.7% vs. 30.5%). Multivariable analysis showed a very modest and statistically insignificant increase in ADR (risk ratio, 1.12; 95% confidence interval, 0.88–1.43).
Conclusions
The use of CADe in clinical practice did not increase ADR with statistical significance when compared to colonoscopy without CADe. These findings suggest that the impact of CADe systems in everyday clinical practice are modest.

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Understanding the discrepancy in the effectiveness of artificial intelligence-assisted colonoscopy: from randomized controlled trials to clinical reality
Jung Ho Bae
Clinical Endoscopy.2024; 57(6): 765. CrossRef

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Development of colonic stent simulator using three-dimensional printing technique: a simulator development study in Korea: Hyundam Gu, Suyoung Lee, Sol Kim, Hye-Lim Jang, Da-Woon Choi, Kyu Seok Kim, Yu Ri Shin, Dae Young Cheung, Bo-In Lee, Jin Il Kim, Han Hee Lee; Clin Endosc 2024;57(6):790-797. Published online September 23, 2024; DOI: https://doi.org/10.5946/ce.2024.110

Graphical Abstract Abstract PDF Supplementary Material PubReader ePub: Background
/Aims: Colonic stenting plays a vital role in the management of acute malignant colonic obstruction. The increasing use of self-expandable metal stents (SEMS) and the diverse challenges posed by colonic obstruction at various locations underscore the importance of effective training for colonic stent placement.
Methods
All the components of the simulator were manufactured using silicone molding techniques in conjunction with three-dimensional (3D) printing. 3D images sourced from computed tomography scans and colonoscopy images were converted into a stereolithography format. Acrylonitrile butadiene styrene copolymers have been used in fused deposition modeling to produce moldings.
Results
The simulator replicated the large intestine from the rectum to the cecum, mimicking the texture and shape of the human colon. It enables training for colonoscopy insertion, cecum intubation, loop reduction, and stenting within stenotic areas. Interchangeable stenotic modules for four sites (rectum, sigmoid colon, descending colon, and ascending colon) were easily assembled for training. These modules integrate tumor contours and blood vessel structures with a translucent center, allowing real-time visualization during stenting. Successful and repeatable demonstrations of stent insertion and expansion using the reusable SEMS were consistently achieved.
Conclusions
This innovative simulator offers a secure colonic stenting practice across various locations, potentially enhancing clinical outcomes by improving operator proficiency during actual procedures.

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Hepatobiliary scintigraphy of bile excretion after endoscopic ultrasound-guided hepaticogastrostomy for malignant biliary obstruction: a retrospective study in Japan: Masanori Yamada, Kazuo Hara, Shin Haba, Takamichi Kuwahara, Nozomi Okuno, Yasuhiro Kuraishi, Takafumi Yanaidani, Sho Ishikawa, Tsukasa Yasuda, Toshitaka Fukui; Clin Endosc 2024;57(6):798-806. Published online August 20, 2024; DOI: https://doi.org/10.5946/ce.2023.291

Graphical Abstract Abstract PDF Supplementary Material PubReader ePub: Background
/Aims: Hepatobiliary scintigraphy (HBS) is used to evaluate bile excretion. This study aimed to evaluate biliary excretion during endoscopic ultrasound-guided hepaticogastrostomy (EUS-HGS) using HBS.
Methods
We retrospectively evaluated 78 consecutive patients with malignant extrahepatic biliary obstruction, who underwent HBS after EUS-HGS between April 2015 and July 2022. The peak time and decay rate were scored with 0, 1, or 2 points based on thresholds of 20 and 35 minutes, and 10% and 50%, respectively. A total score of 4 or 3 was considered indicative of good bile excretion, whereas scores of 2, 1, or 0 indicated poor bile excretion.
Results
The good and poor bile excretion groups included 40 and 38 cases, respectively. The group with good bile excretion had a significantly longer time to recurrent biliary obstruction compared to the poor bile excretion group (not reached vs. 124 days, p=0.026). Multivariate analysis identified the site of obstruction as a significant factor influencing good bile excretion (odds ratio, 3.39; 95% confidence interval, 1.01–11.4, p=0.049), with superior bile excretion observed in cases involving upper biliary obstruction compared to middle or lower biliary obstruction.
Conclusions
In patients with malignant biliary obstruction who underwent HGS, the site of obstruction is significantly associated with stent patency.

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Effectiveness of endoscopic ultrasound-guided tissue acquisition with stereomicroscopic on-site evaluation for preoperative diagnosis of resectable or borderline resectable pancreatic cancer: a prospective study: Junro Ishizaki, Kosuke Okuwaki, Masafumi Watanabe, Hiroshi Imaizumi, Tomohisa Iwai, Rikiya Hasegawa, Takahiro Kurosu, Masayoshi Tadehara, Takaaki Matsumoto, Kai Adachi, Taro Hanaoka, Mitsuhiro Kida, Chika Kusano; Clin Endosc 2024;57(6):807-813. Published online May 24, 2024; DOI: https://doi.org/10.5946/ce.2023.277

Graphical Abstract Abstract PDF PubReader ePub

Background
/Aims: To validate endoscopic ultrasound-guided tissue acquisition (EUS-TA) used in conjunction with stereomicroscopic on-site evaluation (SOSE) as a preoperative diagnostic tool for resectable pancreatic cancer (R-PC) and borderline resectable PC (BR-PC).
Methods
Seventy-eight consecutive patients who underwent EUS-TA for suspected R-PC or BR-PC were enrolled. The primary endpoint was the sensitivity of EUS-TA together with SOSE based on the stereomicroscopically visible white core (SVWC) cutoff value. One or two sites were punctured by using a 22-gauge biopsy needle for EUS-TA, based on the SOSE findings.
Results
We collected 99 specimens from 56 and 22 patients with R-PC and BR-PC, respectively. Based on the SOSE results, we performed 57 procedures with one puncture. The SVWC cutoff values were met in 73.7% and 73.1% of all specimens and in those obtained during the first puncture, respectively. The final diagnoses were malignant and benign tumors in 76 and two patients, respectively. The overall sensitivity, specificity, and accuracy of EUS-TA for the 78 lesions were 90.8%, 100%, and 91.0%, respectively. The sensitivity for malignant diagnosis based on the SVWC cutoff value were 89.5% and 90.4% for the first puncture and all specimens, respectively.
Conclusions
The sensitivity of EUS-TA in conjunction with SOSE for malignancy diagnosis in patients with suspected R-PC or BR-PC was 90.4%.

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A case of needle tract seeding of pancreatic adenosquamous carcinoma after a single endoscopic ultrasound-guided tissue acquisition
Taro Hanaoka, Kosuke Okuwaki, Nobuyuki Nishizawa, Masafumi Watanabe, Kai Adachi, Akihiro Tamaki, Tomohisa Iwai, Mitsuhiro Kida, Yusuke Kumamoto, Chika Kusano
Clinical Journal of Gastroenterology.2024;[Epub] CrossRef

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Comparison of bispectral index-guided endoscopic ultrasonography with continuous vs. intermittent infusion of propofol: a retrospective study in Japan: Ayana Okamoto, Ken Kamata, Tomohiro Yamazaki, Shunsuke Omoto, Kosuke Minaga, Mamoru Takenaka, Masatoshi Kudo; Clin Endosc 2024;57(6):814-820. Published online July 24, 2024; DOI: https://doi.org/10.5946/ce.2024.019

Graphical Abstract Abstract PDF PubReader ePub: Background
/Aims: This study aimed to evaluate the safety and efficacy of continuous propofol infusion for anesthesia during endoscopic ultrasonography (EUS).
Methods
A total of 427 consecutive patients who underwent EUS between May 2018 and February 2019 were enrolled in this study. The patients were divided into two propofol infusion groups: continuous (n=207) and intermittent (n=220). The following parameters were compared: (1) propofol dose, (2) respiratory and circulatory depression, (3) body movement requiring discontinuation of the examination, (4) awakening score, and (5) patient satisfaction.
Results
The median total maintenance dose of propofol was significantly higher in the continuous group than in the intermittent group (160.0 mg vs. 130.0 mg, respectively); however, the reduction in SpO2 was significantly lower in the continuous group (2.9% vs. 13.2%). Body movements occurred less frequently in the continuous group than in the intermittent group (40.1% vs. 49.5%, respectively). The rate of complete awakening was significantly higher in the continuous group than in the intermittent group. Finally, there was a significant difference in the percentage of patients who answered “absolutely yes” when asked about receiving EUS again: 52.7% in the continuous group vs. 34.3% in the intermittent group.
Conclusions
Continuous infusion resulted in stable sedation and reduced propofol-associated risks.

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Microbiological surveillance result of endoscopes after INTERCEPT Foam Spray: a quasi-experimental pilot study in Singapore: Caihong Wang, Rong Zhang, Ruhui Fan, Jiewen Low, Ruochen Du, Xueyun Ma, Congcong Cai; Clin Endosc 2024;57(6):821-831. Published online November 4, 2024; DOI: https://doi.org/10.5946/ce.2024.030

Graphical Abstract Abstract PDF Supplementary Material PubReader ePub: Background
/Aims: This study aimed to assess the impact of INTERCEPT Foam Spray (IFS) application on delayed endoscope reprocessing through microbiological surveillance culture (MSC).
Methods
A quasi-experimental, matched-comparison pilot study was conducted using gastrointestinal endoscopy. IFS was applied to the endoscopes after precleaning and before reprocessing the next day. An equal number of endoscopes, matched by endoscope type, were subjected to routine reprocessing. The MSC were subjected to high-level disinfection to detect any contamination. Data were analyzed using the chi-square test or Fisher exact test (categorical data) and Student t-test (continuous data).
Results
In total, 150 MSCs were collected from 42 endoscopes. Positive MSCs were observed in 4.0% (4/75) of the sprayed group and 1.3% (1/75) of the control group (95% confidence interval, 30.34–0.31; p>0.05), all of which were contributed by colonoscopes. Colonoscope were more prone to positive MSC (mean difference in percentage, p<0.05). Mean spraying hours were not associated with detected growth (11.7% vs. 13.6%; 95% confidence interval, 1.43 to –5.27; p>0.05), with environmental and skin flora being the primary contaminants.
Conclusions
IFS may be applied when delayed endoscope processing is necessary, but with caution when applied to colonoscopes. However, further research is warranted to verify the result.

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Successful iatrogenic duodenal perforation treatment with endoscopic hand suturing: Michał Spychalski, Michał Łabęcki, Matylda Sobczak, Agnieszka Nawrocka-Kunecka, Przemysław Piotr Kasprzyk; Clin Endosc 2024;57(6):832-833. Published online July 24, 2024; DOI: https://doi.org/10.5946/ce.2024.117

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Gel immersion endoscopic mucosal resection for a grade 1 rectal neuroendocrine tumor (carcinoid): Natsuko Saito, Takeshi Yamashina, Masaaki Shimatani; Clin Endosc 2024;57(6):834-835. Published online September 6, 2024; DOI: https://doi.org/10.5946/ce.2024.064

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Awareness of green endoscopy is low among healthcare professionals performing gastrointestinal endoscopy: Tae Joo Jeon, Jae Myung Cha; Clin Endosc 2024;57(6):836-838. Published online July 25, 2024; DOI: https://doi.org/10.5946/ce.2024.004

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Bulging of the major duodenal papilla: Han Taek Jeong, Jimin Han; Clin Endosc 2024;57(6):839-840. Published online September 6, 2024; DOI: https://doi.org/10.5946/ce.2024.141

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Technical challenges and safety of prophylactic gallbladder stenting with metallic biliary stenting: Masood Muhammad Karim, Om Parkash; Clin Endosc 2024;57(6):841-842. Published online October 24, 2024; DOI: https://doi.org/10.5946/ce.2024.193

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