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Javia SB, Reid W, Srikureja W. Saline-immersion endoscopic submucosal dissection using pocket-creation method. VIDEOGIE : AN OFFICIAL VIDEO JOURNAL OF THE AMERICAN SOCIETY FOR GASTROINTESTINAL ENDOSCOPY 2024; 9:35-37. [PMID: 38261865 PMCID: PMC10794121 DOI: 10.1016/j.vgie.2023.09.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
Video 1Saline-immersion endoscopic submucosal dissection using the pocket-creation method.
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Affiliation(s)
- Siddharth B Javia
- Department of Gastroenterology & Hepatology, Confluence Health, Wenatchee, Washington
| | - Whitney Reid
- Department of Pathology, Confluence Health, Wenatchee, Washington
| | - Wichit Srikureja
- Department of Gastroenterology & Hepatology, Loma Linda University, Loma Linda, California
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Toyoshima O, Nishizawa T, Yoshida S, Matsuno T, Arano T, Kondo R, Kinoshita K, Yasumi Y, Tsuji Y, Fujishiro M. Impact of looping on premalignant polyp detection during colonoscopy. World J Gastrointest Endosc 2022; 14:694-703. [PMID: 36438882 PMCID: PMC9693685 DOI: 10.4253/wjge.v14.i11.694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 10/20/2022] [Accepted: 11/07/2022] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The presence of premalignant polyps on colonoscopy is an indicator of metachronous colorectal cancer. Looping during colonoscopy is associated with old age, female sex, and colonoscopy insertion time. However, the clinical significance of looping is not fully understood. We aimed to clarify the effect of looping on colorectal premalignant polyp detection.
AIM To assess the effects of looping on premalignant polyp detection using logistic regression analyses.
METHODS We retrospectively investigated patients who underwent colonoscopy at Toyoshima Endoscopy Clinic between May, 2017 and October, 2020. From the clinic’s endoscopy database, we extracted data on patient age, sex, endoscopist-assessed looping, colonoscopy duration, endoscopist experience, detection rate, and number of premalignant polyps.
RESULTS We assessed 12259 patients (mean age, 53.6 years; men, 50.7%). Looping occurred in 54.3% of the patients. Mild and severe looping were noted in 4399 and 2253 patients, respectively. The detection rates of adenomas, advanced adenomas, high-risk adenomas, clinically significant serrated polyps (CSSPs), and sessile serrated lesions (SSLs) were 44.7%, 2.0%, 9.9%, 8.9% and 3.5%, respectively. The mean numbers of adenomas and SSLs were 0.82 and 0.04, respectively. The detection rates of adenomas, high-risk adenomas, and CSSPs increased with looping severity (all P < 0.001). The number of adenomas increased with looping severity (P < 0.001). Multivariate analyses found that detection of adenomas, high-risk adenomas, and CSSPs was associated with severe looping (P < 0.001, P < 0.001, and P = 0.007, respectively) regardless of age, sex, time required for colonoscope insertion and withdrawal, and endoscopist experience.
CONCLUSION Looping severity was independently associated with high detection rates of premalignant polyps. Therefore, looping may predict the risk of metachronous colorectal cancer. Endoscopists should carefully examine the colorectum of patients with looping.
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Affiliation(s)
- Osamu Toyoshima
- Department of Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo 157-0066, Japan
| | - Toshihiro Nishizawa
- Department of Gastroenterology and Hepatology, International University of Health and Welfare, Narita Hospital, Narita 286-8520, Japan
| | - Shuntaro Yoshida
- Department of Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo 157-0066, Japan
| | - Tatsuya Matsuno
- Department of Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo 157-0066, Japan
| | - Toru Arano
- Department of Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo 157-0066, Japan
| | - Ryo Kondo
- Department of Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo 157-0066, Japan
| | - Kazunori Kinoshita
- Department of Obstetrics and Gynecology, Seijo Kinoshita Hospital, Tokyo 157-0066, Japan
| | - Yuki Yasumi
- Department of Internal Medicine, Yasumi Hospital, Morioka 028-4125, Japan
| | - Yosuke Tsuji
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Mitsuhiro Fujishiro
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
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Liu C, Zheng S, Gao H, Yuan X, Zhang Z, Xie J, Yu C, Xu L. Minimal water exchange by the air-water valve versus left colon water exchange in unsedated colonoscopy: a randomized controlled trial. Endoscopy 2022; 55:324-331. [PMID: 35998673 DOI: 10.1055/a-1929-4552] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
BACKGROUND Water exchange colonoscopy is the least painful method for unsedated colonoscopies. Simplified left colon water exchange (LWE) reduces the cecal intubation time but it is difficult to avoid the use of an additional pump. Minimal water exchange (MWE) is an improved novel method that eliminates the need for pumps, but it is not clear whether MWE has the same efficiency as LWE. METHODS This was a prospective, randomized, controlled, noninferiority trial conducted in a tertiary hospital. Enrolled patients were randomized 1:1 to the LWE group or MWE group. The primary outcome was recalled insertion pain measured by a 4-point verbal rating scale. Secondary outcomes included adenoma detection rate (ADR), cecal intubation time, volume of water used, and patient willingness to repeat unsedated colonoscopy. RESULTS 226 patients were included (LWE n = 113, MWE n = 113). The MWE method showed noninferior moderate/severe pain rates compared with the LWE method (10.6 % vs. 9.7 %), with a difference of 0.9 percentage points (99 % confidence interval [CI] -9.5 to 11.3; threshold, 15 %). ADR, cecal intubation time, and willingness to repeat unsedated colonoscopy were not significantly different between the two groups, but the mean volume of water used was significantly less with MWE than with LWE (163.7 mL vs. 407.2 mL; 99 %CI -298.28 to -188.69). CONCLUSION Compared with LWE, MWE demonstrated a noninferior outcome for insertion pain, and comparable cecal intubation time and ADR, but reduced the volume of water used and eliminated the need for a water pump.
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Affiliation(s)
- Cenqin Liu
- Department of Gastroenterology, Ningbo Hospital, Zhejiang University, Ningbo, China.,Department of Gastroenterology, Ningbo First Hospital, Ningbo, China
| | - Shuhao Zheng
- Department of Gastroenterology, Ningbo First Hospital, Ningbo, China.,School of Medicine, Ningbo University, Ningbo, China
| | - Hui Gao
- Department of Gastroenterology, Ningbo First Hospital, Ningbo, China.,School of Medicine, Ningbo University, Ningbo, China
| | - Xin Yuan
- Department of Gastroenterology, Ningbo First Hospital, Ningbo, China.,School of Medicine, Ningbo University, Ningbo, China
| | - Zhixin Zhang
- Department of Gastroenterology, Ningbo First Hospital, Ningbo, China.,School of Medicine, Ningbo University, Ningbo, China
| | - Jiarong Xie
- Department of Gastroenterology, Ningbo First Hospital, Ningbo, China
| | - Chaohui Yu
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China.,Zhejiang Provincial Clinical Research Center for Digestive Diseases, Hangzhou, China
| | - Lei Xu
- Department of Gastroenterology, Ningbo Hospital, Zhejiang University, Ningbo, China.,Department of Gastroenterology, Ningbo First Hospital, Ningbo, China.,Zhejiang Provincial Clinical Research Center for Digestive Diseases, Hangzhou, China
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4
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Wang M, Shi HT, Tantai XX, Dong L, Ma SY. Feasibility of salvage colonoscopy by water exchange for failed air-insufflated patients: a prospective, randomized, controlled trial. Scand J Gastroenterol 2022; 57:507-512. [PMID: 34932434 DOI: 10.1080/00365521.2021.2018488] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND A complete colonoscopy is crucial for screening colorectal diseases and colorectal cancer. However, a failure rate of up to 43% still exists. Several studies have indicated that the water exchange method can enhance the cecal intubation rate while reducing discomfort of the patient. Water exchange colonoscopy (WEC) might be a salvage treatment for the patients who failed from air insufflation colonoscopy (AIC). We aimed to assess the feasibility of WEC as a salvage measure following the failure of conventional AIC. METHODS Patients willing to undergo unsedated colonoscopy at a tertiary-care referral center in China were randomly assigned 1:1 to WEC or AIC group for salvage after the initial AIC attempt failed. Patients were blinded to group assignment. The primary outcome was cecal intubation rate, the secondary outcomes included time to the cecum, maximum pain scores, and technical difficulty level. RESULTS Recruited 104 patients were randomized to the WEC (n = 52) or AIC (n = 52) group. WEC significantly increased the cecal intubation rate (92.3% vs 73.1%; p = .02). The maximum pain scores and technical difficulty level in the WEC group were significantly lower than the AIC group during salvage procedure (p < .001). CONCLUSIONS This randomized, controlled trial confirms that the WEC significantly enhanced cecal intubation rate in difficult colonoscopy in unsedated patients after the failure of standard AIC. The increased cecal intubation rate, lower pain scores and technical difficulty level suggest WEC is a good alternative for incomplete unsedated colonoscopy. Clinical trial registration number: ChiCTR2100051483.
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Affiliation(s)
- Mo Wang
- Division of Gastroenterology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Hai-Tao Shi
- Division of Gastroenterology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Xin-Xing Tantai
- Division of Gastroenterology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Lei Dong
- Division of Gastroenterology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Shi-Yang Ma
- Division of Gastroenterology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
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Cadoni S, Ishaq S, Hassan C, Falt P, Fuccio L, Siau K, Leung JW, Anderson J, Binmoeller KF, Radaelli F, Rutter MD, Sugimoto S, Muhammad H, Bhandari P, Draganov PV, de Groen P, Wang AY, Yen AW, Hamerski C, Thorlacius H, Neumann H, Ramirez F, Mulder CJJ, Albéniz E, Amato A, Arai M, Bak A, Barret M, Bayupurnama P, Cheung R, Ching HL, Cohen H, Dolwani S, Friedland S, Harada H, Hsieh YH, Hayee B, Kuwai T, Lorenzo-Zúñiga V, Liggi M, Mizukami T, Mura D, Nylander D, Olafsson S, Paggi S, Pan Y, Parra-Blanco A, Ransford R, Rodriguez-Sanchez J, Senturk H, Suzuki N, Tseng CW, Uchima H, Uedo N, Leung FW. Water-assisted colonoscopy: an international modified Delphi review on definitions and practice recommendations. Gastrointest Endosc 2021; 93:1411-1420.e18. [PMID: 33069706 DOI: 10.1016/j.gie.2020.10.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 10/08/2020] [Indexed: 02/08/2023]
Abstract
BACKGROUND AND AIMS Since 2008, a plethora of research studies has compared the efficacy of water-assisted (aided) colonoscopy (WAC) and underwater resection (UWR) of colorectal lesions with standard colonoscopy. We reviewed and graded the research evidence with potential clinical application. We conducted a modified Delphi consensus among experienced colonoscopists on definitions and practice of water immersion (WI), water exchange (WE), and UWR. METHODS Major databases were searched to obtain research reports that could potentially shape clinical practice related to WAC and UWR. Pertinent references were graded (Grading of Recommendations, Assessment, Development and Evaluation). Extracted data supporting evidence-based statements were tabulated and provided to respondents. We received responses from 55 (85% surveyed) experienced colonoscopists (37 experts and 18 nonexperts in WAC) from 16 countries in 3 rounds. Voting was conducted anonymously in the second and third round, with ≥80% agreement defined as consensus. We aimed to obtain consensus in all statements. RESULTS In the first and the second modified Delphi rounds, 20 proposed statements were decreased to 14 and then 11 statements. After the third round, the combined responses from all respondents depicted the consensus in 11 statements (S): definitions of WI (S1) and WE (S2), procedural features (S3-S5), impact on bowel cleanliness (S6), adenoma detection (S7), pain score (S8), and UWR (S9-S11). CONCLUSIONS The most important consensus statements are that WI and WE are not the same in implementation and outcomes. Because studies that could potentially shape clinical practice of WAC and UWR were chosen for review, this modified Delphi consensus supports recommendations for the use of WAC in clinical practice.
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Affiliation(s)
- Sergio Cadoni
- CTO Hospital, Digestive Endoscopy Unit, Iglesias, Italy
| | - Sauid Ishaq
- Russell Hall, Dept. of Gastroenterology, Birmingham, United Kingdom; Birmingham City University, Birmingham, United Kingdom
| | - Cesare Hassan
- Nuovo Regina Margherita Hospital, Digestive Endoscopy Unit, Rome, Italy
| | - Přemysl Falt
- University Hospital and Faculty of Medicine, Palacky University, Olomouc, Czech Republic; Faculty of Medicine, Charles University, Hradec Králové, Czech Republic
| | - Lorenzo Fuccio
- S. Orsola-Malpighi University Hospital, Department of Medical and Surgical Sciences, Bologna, Italy
| | - Keith Siau
- JAG Clinical Fellow, JAG, Royal College of Physicians, London, United Kingdom
| | - Joseph W Leung
- Division of Gastroenterology and Hepatology, Sacramento VA Medical Center and University of California Davis School of Medicine, Sacramento, California, USA
| | - John Anderson
- Gloucestershire Hospitals NHS Foundation Trust, Gloucestershire, United Kingdom
| | - Kenneth F Binmoeller
- California Pacific Medical Center, Interventional Endoscopy Services, San Francisco, California, United States
| | | | - Matt D Rutter
- University Hospital North Tees NHS, Department of Gastroenterology, Stockton-on-Tees, United Kingdom; Population Health Sciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, United Kingdom
| | - Shinya Sugimoto
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
| | | | - Pradeep Bhandari
- Portsmouth University Hospital, Dept. of Gastroenterology, Portsmouth, United Kingdom
| | | | - Piet de Groen
- University of Minnesota, Division of Gastroenterology, Minneapolis, Minnesota, United States
| | - Andrew Y Wang
- Division of Gastroenterology and Hepatology, University of Virginia, Charlottesville, Virginia, United States
| | - Andrew W Yen
- Division of Gastroenterology and Hepatology, Sacramento VA Medical Center and University of California Davis School of Medicine, Sacramento, California, USA
| | - Chris Hamerski
- California Pacific Medical Center, Interventional Endoscopy Services, San Francisco, California, United States
| | - Henrik Thorlacius
- Lund University Surgery, Department of Gastrointestinal Surgery, Malmö, Sweden
| | - Helmut Neumann
- University Medical Center, Interventional Endoscopy Center, Medizinische Klinik und Poliklinik, Mainz, Germany
| | | | - Chris J J Mulder
- VU University Medical Center, Department of Gastroenterology, Amsterdam, The Netherlands
| | - Eduardo Albéniz
- Gastroenterology Department, Endoscopy Unit, Complejo Hospitalario de Navarra, Pamplona, Spain
| | - Arnaldo Amato
- Ospedale Valduce, Gastroenterology Unit, Como, Italy
| | - Makoto Arai
- Chiba University, Gastroenterology Department, Chiba, Japan
| | - Adrian Bak
- University of British Columbia, Department of Medicine, Kelowna, Canada
| | | | - Putut Bayupurnama
- Division of Gastroenterology and Hepatology, Internal Medicine Department, Faculty of Medicine, Gadjah Mada University, Sardjito General Hospital, Yogyakarta, Indonesia
| | - Ramsey Cheung
- Division of Gastroenterology and Hepatology, Stanford University School of Medicine, VA Palo Alto, California, United States
| | - Hey-Long Ching
- Sheffield Teaching Hospitals, Gastroenterology Department, Sheffield, United Kingdom
| | - Hartley Cohen
- Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, United States; David Geffen School of Medicine at UCLA, Department of Medicine, Los Angeles, California, United States
| | - Sunil Dolwani
- Division of Population Medicine, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Shai Friedland
- Division of Gastroenterology and Hepatology, Stanford University School of Medicine, VA Palo Alto, California, United States
| | - Hideaki Harada
- Department of Gastroenterology, New Tokyo Hospital, Gastroenterology, Matsudo, Chiba, Japan
| | - Yu-Hsi Hsieh
- Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Dalin Township, Taiwan
| | - Bu Hayee
- King's College Hospital NHS foundation Trust, Gastroenterology Department, London, United Kingdom
| | - Toshio Kuwai
- NHO Kure Medical Center and Chugoku Cancer Center, Gastroenterology Department, Kure, Japan
| | | | - Mauro Liggi
- ASSL Carbonia, Sirai Hospital, Digestive Endoscopy Unit, Carbonia, Italy
| | - Takeshi Mizukami
- NHO Kurihama Medical and Addiction Center, Endoscopy Center, Yokosuka, Japan
| | - Donatella Mura
- ASSL Carbonia, Sirai Hospital, Digestive Endoscopy Unit, Carbonia, Italy
| | - David Nylander
- Newcastle Upon Tyne NHS Foundation Trust, Gastroenterology Department, Newcastle Upon Tyne, United Kingdom
| | - Snorri Olafsson
- Telemark Hospital, Gastroenterology Department, Skien, Norway
| | - Silvia Paggi
- Ospedale Valduce, Gastroenterology Unit, Como, Italy
| | - Yanglin Pan
- Xijing Hospital, Department of Gastroenterology, Xian, Republic of China
| | - Adolfo Parra-Blanco
- NIHR Nottingham Biomedical Research Centre, Department of Gastroenterology, Nottingham University Hospitals NHS Trust and University of Nottingham, Nottingham, United Kingdom
| | - Rupert Ransford
- Endoscopy Department Hereford County Hospital, Hereford, United Kingdom
| | | | - Hakan Senturk
- Bezmialem Vakif University Medicine Faculty, Department of Medicine, Istanbul, Turkey
| | - Noriko Suzuki
- Wolfson Unit for Endoscopy, St Mark's Hospital, London, United Kingdom
| | - Chih-Wei Tseng
- Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Dalin Township, Taiwan
| | - Hugo Uchima
- Hospital Germans Triasi i Pujol, Teknon Medical Center, Gastroenterology, Barcelona, Spain
| | - Noriya Uedo
- Osaka International Cancer Institute, Department of Gastrointestinal Oncology, Osaka, Japan
| | - Felix W Leung
- Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, United States; David Geffen School of Medicine at UCLA, Department of Medicine, Los Angeles, California, United States
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Tan X, Yang W, Wichmann D, Huang C, Mothes B, Grund KE, Chen Z, Chen Z. Magnetic endoscopic imaging as a rational investment for specific colonoscopies: a systematic review and meta-analysis. Expert Rev Gastroenterol Hepatol 2021; 15:447-458. [PMID: 33267703 DOI: 10.1080/17474124.2021.1842192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND Magnetic endoscopic imaging (MEI) was regarded as an adjuvant device to improve procedural efficacy and patients' comfort during colonoscopy. METHODS Several electronic databases were searched to identify eligible studies. Based on the heterogeneity of included studies, random-effects or fixed-effects models were used to calculate pooled risk ratios (RR), risk difference (RD) or mean difference (MD) along with 95% confidence intervals (CIs). RESULTS Twenty-one randomized controlled trials (RCTs) were selected for meta-analysis, with a total of 7,060 patients. Although there is a slightly lower risk of cecal intubation failure with the adjuvant of MEI (RD 3%; P < 0.00001) compared to the control group, the updated studies show no significant benefits. Similarly, the cecal intubation time, pain scores, and loop formation with the adjuvant of MEI did not show any advantages. However, considerable significant benefits were found in the subgroup of technically difficult colonoscopy and inexperienced colonoscopists. Moreover, MEI was associated with lower loop intubation time, lower abdominal compression times, and better lesion localization. CONCLUSION The clinical benefits of MEI could be exaggerated. However, MEI has considerable advantages in technically difficult colonoscopies, the assistance for inexperienced colonoscopists, loop resolving, and lesion localization.
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Affiliation(s)
- Xiangzhou Tan
- Department of General Surgery, Xiangya Hospital Central South University, Changsha, Hunan Province, China.,Hunan Key Laboratory of Precise Diagnosis and Treatment of Gastrointestinal Tumor, Xiangya Hospital Central South University, Changsha, Hunan Province, China.,Department of General, Visceral and Transplant Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - Weimin Yang
- Department of General Surgery, Xiangya Hospital Central South University, Changsha, Hunan Province, China.,Hunan Key Laboratory of Precise Diagnosis and Treatment of Gastrointestinal Tumor, Xiangya Hospital Central South University, Changsha, Hunan Province, China.,Department of General Surgery, Huaihua Hospital Affiliated to University of South China, Huaihua, Hunan Province, China
| | - Doerte Wichmann
- Department of General, Visceral and Transplant Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - Changhao Huang
- Department of General Surgery, Xiangya Hospital Central South University, Changsha, Hunan Province, China.,Hunan Key Laboratory of Precise Diagnosis and Treatment of Gastrointestinal Tumor, Xiangya Hospital Central South University, Changsha, Hunan Province, China
| | - Benedikt Mothes
- Department of General, Visceral and Transplant Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - K E Grund
- Department of General, Visceral and Transplant Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - Zhikang Chen
- Department of General Surgery, Xiangya Hospital Central South University, Changsha, Hunan Province, China.,Hunan Key Laboratory of Precise Diagnosis and Treatment of Gastrointestinal Tumor, Xiangya Hospital Central South University, Changsha, Hunan Province, China
| | - Zihua Chen
- Department of General Surgery, Xiangya Hospital Central South University, Changsha, Hunan Province, China.,Hunan Key Laboratory of Precise Diagnosis and Treatment of Gastrointestinal Tumor, Xiangya Hospital Central South University, Changsha, Hunan Province, China
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Vilmann AS, Lachenmeier C, Svendsen MBS, Søndergaard B, Park YS, Svendsen LB, Konge L. Using computerized assessment in simulated colonoscopy: a validation study. Endosc Int Open 2020; 8:E783-E791. [PMID: 32490164 PMCID: PMC7247901 DOI: 10.1055/a-1132-5259] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 01/27/2020] [Indexed: 01/06/2023] Open
Abstract
Background and study aims Patient safety during a colonoscopy highly depends on endoscopist competence. Endoscopic societies have been calling for an objective and regular assessment of the endoscopists, but existing assessment tools are time-consuming and prone to bias. We aimed to develop and gather evidence of validity for a computerized assessment tool delivering automatic and unbiased assessment of colonoscopy based on 3 dimensional coordinates from the colonoscope. Methods Twenty-four participants were recruited and divided into two groups based on experience: 12 experienced and 12 novices. Participants performed twice on a physical phantom model with a standardized alpha loop in the sigmoid colon. Data was gathered directly from the Olympus ScopeGuide system providing XYZ-coordinates along the length of the colonoscope. Five different motor skill measures were developed based on the data, named: Travel Length, Tip Progression, Chase Efficiency, Shaft movement without tip progression, and Looping. Results The experinced had a lower travel length ( P < 0.001), tip progression ( P < 0.001), chase efficiency ( P = 0.001) and looping ( P = 0.006), and a higher shaft movement without tip progression ( P < 0.001) reaching the cecum compared with the novices. A composite score was developed based on the five measurements to create a combined score of progression, the 3D-Colonoscopy-Progression-Score (3D-CoPS). The 3D-CoPS revealed a significant difference between groups (experienced: 0.495 (SD 0.303) and novices -0.454 (SD 0.707), P < 0.001). Conclusion This study presents a novel, real-time computerized assessment tool for colonoscopy, and strong evidence of validity was gathered in a simulation-based setting. The system shows promising opportunities for automatic, unbiased and continuous assessment of colonoscopy performance.
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Affiliation(s)
| | | | | | - Bo Søndergaard
- University Hospital Hvidovre, Department of Gastroenterology and Gastrointestinal Surgery, Copenhagen, Denmark
| | - Yoon Soo Park
- University of Illinois at Chicago, Department of Medical Education, Chicago, Illinois, United States
| | | | - Lars Konge
- Rigshospitalet – CAMES, Copenhagen, Denmark
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8
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Ciuti G, Skonieczna-Żydecka K, Marlicz W, Iacovacci V, Liu H, Stoyanov D, Arezzo A, Chiurazzi M, Toth E, Thorlacius H, Dario P, Koulaouzidis A. Frontiers of Robotic Colonoscopy: A Comprehensive Review of Robotic Colonoscopes and Technologies. J Clin Med 2020; 9:E1648. [PMID: 32486374 PMCID: PMC7356873 DOI: 10.3390/jcm9061648] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 05/16/2020] [Accepted: 05/19/2020] [Indexed: 12/15/2022] Open
Abstract
Flexible colonoscopy remains the prime mean of screening for colorectal cancer (CRC) and the gold standard of all population-based screening pathways around the world. Almost 60% of CRC deaths could be prevented with screening. However, colonoscopy attendance rates are affected by discomfort, fear of pain and embarrassment or loss of control during the procedure. Moreover, the emergence and global thread of new communicable diseases might seriously affect the functioning of contemporary centres performing gastrointestinal endoscopy. Innovative solutions are needed: artificial intelligence (AI) and physical robotics will drastically contribute for the future of the healthcare services. The translation of robotic technologies from traditional surgery to minimally invasive endoscopic interventions is an emerging field, mainly challenged by the tough requirements for miniaturization. Pioneering approaches for robotic colonoscopy have been reported in the nineties, with the appearance of inchworm-like devices. Since then, robotic colonoscopes with assistive functionalities have become commercially available. Research prototypes promise enhanced accessibility and flexibility for future therapeutic interventions, even via autonomous or robotic-assisted agents, such as robotic capsules. Furthermore, the pairing of such endoscopic systems with AI-enabled image analysis and recognition methods promises enhanced diagnostic yield. By assembling a multidisciplinary team of engineers and endoscopists, the paper aims to provide a contemporary and highly-pictorial critical review for robotic colonoscopes, hence providing clinicians and researchers with a glimpse of the major changes and challenges that lie ahead.
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Affiliation(s)
- Gastone Ciuti
- The BioRobotics Institute, Scuola Superiore Sant’Anna, 56025 Pisa, Italy; (V.I.); (M.C.); (P.D.)
- Department of Excellence in Robotics & AI, Scuola Superiore Sant’Anna, 56127 Pisa, Italy
| | - Karolina Skonieczna-Żydecka
- Department of Human Nutrition and Metabolomics, Pomeranian Medical University in Szczecin, 71-460 Szczecin, Poland;
| | - Wojciech Marlicz
- Department of Gastroenterology, Pomeranian Medical University in Szczecin, 71-252 Szczecin, Poland;
- Endoklinika sp. z o.o., 70-535 Szczecin, Poland
| | - Veronica Iacovacci
- The BioRobotics Institute, Scuola Superiore Sant’Anna, 56025 Pisa, Italy; (V.I.); (M.C.); (P.D.)
- Department of Excellence in Robotics & AI, Scuola Superiore Sant’Anna, 56127 Pisa, Italy
| | - Hongbin Liu
- School of Biomedical Engineering & Imaging Sciences, Faculty of Life Sciences and Medicine, King’s College London, London SE1 7EH, UK;
| | - Danail Stoyanov
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), University College London, London W1W 7TY, UK;
| | - Alberto Arezzo
- Department of Surgical Sciences, University of Torino, 10126 Torino, Italy;
| | - Marcello Chiurazzi
- The BioRobotics Institute, Scuola Superiore Sant’Anna, 56025 Pisa, Italy; (V.I.); (M.C.); (P.D.)
- Department of Excellence in Robotics & AI, Scuola Superiore Sant’Anna, 56127 Pisa, Italy
| | - Ervin Toth
- Department of Gastroenterology, Skåne University Hospital, Lund University, 20502 Malmö, Sweden;
| | - Henrik Thorlacius
- Department of Clinical Sciences, Section of Surgery, Lund University, 20502 Malmö, Sweden;
| | - Paolo Dario
- The BioRobotics Institute, Scuola Superiore Sant’Anna, 56025 Pisa, Italy; (V.I.); (M.C.); (P.D.)
- Department of Excellence in Robotics & AI, Scuola Superiore Sant’Anna, 56127 Pisa, Italy
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9
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Choy MC, Matharoo M, Thomas-Gibson S. Diagnostic ileocolonoscopy: getting the basics right. Frontline Gastroenterol 2020; 11:484-490. [PMID: 33101627 PMCID: PMC7569527 DOI: 10.1136/flgastro-2019-101266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 02/15/2020] [Accepted: 02/17/2020] [Indexed: 02/04/2023] Open
Abstract
Proficient colonoscopy technique that optimises patient comfort while simultaneously enhancing the timely detection of pathology and subsequent therapy is an aspirational and achievable goal for every endoscopist. This article aims to provide strategies to improve colonoscopy quality for both endoscopists and patients.
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Affiliation(s)
- Matthew C Choy
- Wolfson Endoscopy Unit, St Marks Hospital, Harrow, UK,Department of Medicine, Austin Academic Centre, University of Melbourne, Melbourne, Victoria, Australia
| | | | - Siwan Thomas-Gibson
- Wolfson Endoscopy Unit, St Marks Hospital, Harrow, UK,Department of Surgery and Cancer, Imperial College London, London, UK
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10
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Siau K, Beintaris I. My approach to water-assisted colonoscopy. Frontline Gastroenterol 2019; 10:194-197. [PMID: 31205663 PMCID: PMC6540304 DOI: 10.1136/flgastro-2018-101143] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 12/03/2018] [Accepted: 12/09/2018] [Indexed: 02/04/2023] Open
Abstract
The goal of diagnostic colonoscopy is to achieve procedural completion while maximising effectiveness, patient acceptance and safety. In recent years, international interest in water-assisted colonoscopy (WAC) has been steadily gathering pace. A plethora of high-quality randomised controlled trials and meta-analyses now offer incontrovertible evidence into the benefits of WAC, both for the endoscopist and the patient. Despite this, uptake of WAC within the UK has been limited, with the lack of educational resources representing a significant barrier. This practical step-by-step guide is aimed at both existing practitioners and trainees, with a view to promoting familiarity with WAC and potentially for incorporation into daily practice which may ultimately have a positive effect on quality of colonoscopy and patient experience.
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Affiliation(s)
- Keith Siau
- Department of Gastroenterology, Dudley Group Hospitals NHS Foundation Trust, Dudley, UK
- Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Iosif Beintaris
- Department of Gastroenterology, North Tees and Hartlepool NHS Foundation Trust, Stockton-on-Tees, UK
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11
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Abstract
PURPOSE OF THE REVIEW Progress towards the goal of high-quality endoscopy across health economies has been founded on high-quality structured training programmes linked to credentialing practice and ongoing performance monitoring. This review appraises the recent literature on training interventions, which may benefit performance and competency acquisition in novice endoscopy trainees. RECENT FINDINGS Increasing data on the learning curves for different endoscopic procedures has highlighted variations in performance amongst trainees. These differences may be dependent on the trainee, trainer and training programme. Evidence of the benefit of knowledge-based training, simulation training, hands-on courses and clinical training is available to inform the planning of ideal training pathway elements. The validation of performance assessment measures and global competency tools now also provides evidence on the effectiveness of training programmes to influence the learning curve. The impact of technological advances and intelligent metrics from national databases is also predicted to drive improvements and efficiencies in training programme design and monitoring of post-training outcomes. Training in endoscopy may be augmented through a series of pre-training and in-training interventions. In conjunction with performance metrics, these evidence-based interventions could be implemented into training pathways to optimise and quality assure training in endoscopy.
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Affiliation(s)
- Keith Siau
- Department of Gastroenterology, Dudley Group Hospitals NHS Foundation Trust, Dudley, UK. .,Joint Advisory Group on Gastrointestinal Endoscopy, Royal College of Physicians, London, UK.
| | - Neil D Hawkes
- Joint Advisory Group on Gastrointestinal Endoscopy, Royal College of Physicians, London, UK.,Department of Gastroenterology, Cwm Taf University Health Board, Llantrisant, UK
| | - Paul Dunckley
- Joint Advisory Group on Gastrointestinal Endoscopy, Royal College of Physicians, London, UK.,Department of Gastroenterology, Gloucestershire Royal Hospital, Gloucester, UK
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12
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The impact of water-aided methods on pain reduction and adenoma detection rate during colonoscopy. ADVANCES IN DIGESTIVE MEDICINE 2018. [DOI: 10.1002/aid2.13067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13
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Rogers MC, Gawron A, Grande D, Keswani RN. Development and validation of an algorithm to complete colonoscopy using standard endoscopes in patients with prior incomplete colonoscopy. Endosc Int Open 2017; 5:E886-E892. [PMID: 28924595 PMCID: PMC5595582 DOI: 10.1055/s-0043-114663] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Accepted: 05/22/2017] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND AND STUDY AIMS Incomplete colonoscopy may occur as a result of colon angulation (adhesions or diverticulosis), endoscope looping, or both. Specialty endoscopes/devices have been shown to successfully complete prior incomplete colonoscopies, but may not be widely available. Radiographic or other image-based evaluations have been shown to be effective but may miss small or flat lesions, and colonoscopy is often still indicated if a large lesion is identified. The purpose of this study was to develop and validate an algorithm to determine the optimum endoscope to ensure completion of the examination in patients with prior incomplete colonoscopy. PATIENTS AND METHODS This was a prospective cohort study of 175 patients with prior incomplete colonoscopy who were referred to a single endoscopist at a single academic medical center over a 3-year period from 2012 through 2015. Colonoscopy outcomes from the initial 50 patients were used to develop an algorithm to determine the optimal standard endoscope and technique to achieve cecal intubation. The algorithm was validated on the subsequent 125 patients. RESULTS The overall repeat colonoscopy success rate using a standard endoscope was 94 %. The initial standard endoscope specified by the algorithm was used and completed the colonoscopy in 90 % of patients. CONCLUSIONS This study identifies an effective strategy for completing colonoscopy in patients with prior incomplete examination, using widely available standard endoscopes and an algorithm based on patient characteristics and reasons for prior incomplete colonoscopy.
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Affiliation(s)
- Melinda C. Rogers
- Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States,Corresponding author Melinda Rogers, MD Gastroenterology and HepatologyNorthwestern University Feinberg School of Medicine676 N St. Claire St, Suite 1400ChicagoIllinois 60611-3008United States+1-312-695-3999
| | - Andrew Gawron
- Gastroenterology and Hepatology, University of Utah School of Medicine, Ringgold Standard Institution, Salt Lake City, Utah, United States
| | - David Grande
- Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
| | - Rajesh N. Keswani
- Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
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14
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Mizukami T, Sugimoto S, Masaoka T, Suzuki H, Kanai T. Colonic dysmotility and morphological abnormality frequently detected in Japanese patients with irritable bowel syndrome. Intest Res 2017; 15:236-243. [PMID: 28522955 PMCID: PMC5430017 DOI: 10.5217/ir.2017.15.2.236] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 12/04/2016] [Accepted: 12/06/2016] [Indexed: 12/13/2022] Open
Abstract
Background/Aims Colonoscopy and computed tomography (CT) are used primarily to exclude organic diseases in patients with irritable bowel syndrome (IBS), rather than to assess the pathophysiology of IBS. We aimed to evaluate colonic dysmotility and morphology in Japanese patients with IBS. Methods One hundred eighty-four patients with IBS and 49 asymptomatic controls who underwent colonoscopy in combination with CT colonography or barium enema were retrospectively reviewed between 2008 and 2012. Water-aided colonoscopy was performed without sedation by a single endoscopist. The duration and pattern of colonic movement and cecal intubation time were recorded. To assess colonic morphology, barium enema or CT colonography were performed immediately after colonoscopy. Results Colonic dysmotility was more frequent in the IBS group (28.8% vs. 2.0% in controls, P<0.001), especially in cases of IBS with diarrhea (IBS-D) (IBS with constipation [IBS-C] 28.8% vs. IBS-D 60.0% vs. mixed IBS [IBS-M] 5.1%, P<0.001). Colonic morphological abnormality was more frequent in the IBS group than in the control group (77.7% vs. 24.5%, P<0.001), especially in IBS-M and IBS-C groups (IBS-C 77.5% vs. IBS-D 48.9% vs. IBS-M 100%, P<0.001). Most patients with IBS with colonic dysmotility had experienced stress related to their symptoms. Cecal intubation time was significantly longer in the IBS group than in the control group (12.1±6.9 minutes vs. 4.6±1.9 minutes, P<0.001). Conclusions Unsedated colonoscopy, combined with radiographic findings, can detect colonic dysmotility and morphological abnormality. Technical difficulties observed during cecal intubation may partially explain the pathophysiology of IBS.
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Affiliation(s)
- Takeshi Mizukami
- Endoscopy Center, NHO Kurihama Medical and Addiction Center, Yokosuka, Japan
| | - Shinya Sugimoto
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Tatsuhiro Masaoka
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Hidekazu Suzuki
- Medical Education Center, Keio University School of Medicine, Tokyo, Japan
| | - Takanori Kanai
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
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16
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Arai M, Okimoto K, Ishigami H, Taida T, Oyamada A, Minemura S, Saito K, Tsuboi M, Maruoka D, Matsumura T, Nakagawa T, Katsuno T, Mitsuhashi K, Nakagawa Y, Yamaguchi K, Yokosuka O. A randomized controlled trial comparing water exchange and air insufflation during colonoscopy without sedation. Int J Colorectal Dis 2016; 31:1217-23. [PMID: 27059039 DOI: 10.1007/s00384-016-2580-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/30/2016] [Indexed: 02/04/2023]
Abstract
OBJECTIVES Previous studies have shown that water exchange is superior to air insufflation in attenuating insertion pain during colonoscopy. We conducted a randomized controlled trial with head-to-head comparison of these methods to assess their effectiveness in colonoscopy without sedation. METHODS A total of 447 outpatients were randomized to either water exchange (WE) or the standard air (CO2) insufflation (AI). The primary outcome was the improvement of patient intraprocedural pain (pain score), evaluated using a questionnaire (scores 1 to 5). RESULTS After exclusion of 44 patients from further analysis, 403 patients were analyzed. There was no difference in clinical background between the WE and AI groups. Patients in the WE group reported less intraprocedural pain than those in the AI group (2.17 ± 1.06 vs. 2.42 ± 1.03; unpaired t test, p = 0.021). We divided the cases into two groups, more or less painful colonoscopy, based on age, body mass index, use of anti-peristaltic drugs or not, and physician's experience. In less painful colonoscopy, the WE method could reduce pain effectively but its effect was limited in the more painful group. CONCLUSION WE is superior to AI for attenuating insertion pain during colonoscopy without sedation, but its efficacy is limited in more painful endoscopy.
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Affiliation(s)
- Makoto Arai
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan.
| | - Kenichiro Okimoto
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Hideaki Ishigami
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Takashi Taida
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Arata Oyamada
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Shoko Minemura
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Keiko Saito
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Masaru Tsuboi
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Daisuke Maruoka
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Tomoaki Matsumura
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Tomoo Nakagawa
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Tatsuro Katsuno
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
| | - Kanae Mitsuhashi
- Chiba Foundation for Health Promotion and Disease Prevention, Chiba, Japan
| | - Yuki Nakagawa
- Chiba Foundation for Health Promotion and Disease Prevention, Chiba, Japan
| | - Kazuya Yamaguchi
- Chiba Foundation for Health Promotion and Disease Prevention, Chiba, Japan
| | - Osamu Yokosuka
- Department of Gastroenterology and Nephrology (K1), Graduate School of Medicine, Chiba University, Inohana 1-8-1, Chiba, 260-8670, Japan
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Sugimoto S, Mizukami T. Discrepancy in the classification of water immersion from water exchange colonoscopy. Gastrointest Endosc 2016; 83:676-7. [PMID: 26897056 DOI: 10.1016/j.gie.2015.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 10/14/2015] [Indexed: 12/11/2022]
Affiliation(s)
- Shinya Sugimoto
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Takeshi Mizukami
- Endoscopy Center, NHO Kurihama Medical and Addiction Center, Kanagawa, Japan
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18
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Sugimoto S, Mizukami T. Diagnostic and therapeutic applications of water-immersion colonoscopy. World J Gastroenterol 2015; 21:6451-6459. [PMID: 26074684 PMCID: PMC4458756 DOI: 10.3748/wjg.v21.i21.6451] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 03/15/2015] [Accepted: 04/28/2015] [Indexed: 02/06/2023] Open
Abstract
Colonoscopy techniques combining or replacing air insufflation with water infusion are becoming increasingly popular. They were originally designed to reduce colonic spasms, facilitate cecal intubation, and lower patient discomfort and the need for sedation. These maneuvers straighten the rectosigmoid colon and enable the colonoscope to be inserted deeply without causing looping of the colon. Water-immersion colonoscopy minimizes colonic distension and improves visibility by introducing a small amount of water. In addition, since pain during colonoscopy indicates risk of bowel perforation and sedation masks this important warning, this method has the potential to be the favored insertion technique because it promotes patient safety without sedation. Recently, this water-immersion method has not only been used for colonoscope insertion, but has also been applied to therapy for sigmoid volvulus, removal of lesions, lower gastrointestinal bleeding, and therapeutic diagnosis of abnormal bowel morphology and irritable bowel syndrome. Although a larger sample size and prospective head-to-head-designed studies will be needed, this review focuses on the usefulness of water-immersion colonoscopy for diagnostic and therapeutic applications.
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