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  1. Article ; Online: Percutaneous coronary intervention and GI hemorrhage: need for accurate predictors of the link to rebleeding.

    Leung, Felix W

    Gastrointestinal endoscopy

    2023  Volume 99, Issue 1, Page(s) 21–22

    MeSH term(s) Humans ; Gastrointestinal Hemorrhage/etiology ; Gastrointestinal Hemorrhage/therapy ; Risk Factors ; Percutaneous Coronary Intervention ; Recurrence
    Language English
    Publishing date 2023-06-07
    Publishing country United States
    Document type Editorial
    ZDB-ID 391583-9
    ISSN 1097-6779 ; 0016-5107
    ISSN (online) 1097-6779
    ISSN 0016-5107
    DOI 10.1016/j.gie.2023.09.024
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Outcome of Water Exchange and Air Insufflation Colonoscopy Performed by Supervised Trainee and Their Assessment of the Training Experience.

    Leung, Felix W

    Journal of clinical gastroenterology

    2023  Volume 57, Issue 8, Page(s) 810–815

    Abstract: Goals: The hypotheses that supervised trainees would provide a more favorable assessment of the learning experience and could achieve superior results with water exchange (WE) compared with air insufflation were tested.: Background: WE decreased pain, ...

    Abstract Goals: The hypotheses that supervised trainees would provide a more favorable assessment of the learning experience and could achieve superior results with water exchange (WE) compared with air insufflation were tested.
    Background: WE decreased pain, increased cecal intubation rate (CIR), and polyp detection rate (PDR).
    Study: In a prospective pilot observational study, the trainees were taught WE in unsedated and WE and air insufflation in alternating order in sedated veterans. Trainee scores and procedural outcomes were tracked.
    Results: 83 air insufflation and 119 WE cases were included. Trainee evaluations of the respective methods were scored based on a 5-point scale [1 (strongly agree) to 5 (strongly disagree, with lower scores being more favorable]. Evaluation scores [mean (SD)] were as follows: my colonoscopy experience was better than expected: WE 2.02 (1.00) versus air insufflation 2.43 (1.19), P =0.0087; I was confident with my technical skills using this method: WE 2.76 (0.91) versus air insufflation 2.85 (0.87), P =0.4822. Insertion time was 40 (21) min for WE and 30 (20) min for air insufflation ( P =0.0008). CIR were 95% (WE, unsedated); 99% (WE, overall), and 89% (air insufflation, overall). WE showed significantly higher CIR (99% vs. 89%, P =0.0031) and PDR (54% vs. 32%, P =0.0447).
    Conclusions: The long air insufflation insertion time indicated the trainees were inexperienced. The significantly longer WE insertion time confirmed that learning WE required extra time. This pilot study revealed that supervised trainees reported more favorable learning experience with WE and equivalent confidence in technical skills scores. They completed both unsedated and sedated colonoscopy in over 89% of cases achieved significantly higher CIR and PDR with WE than air insufflation. It appeared that trainee education in WE might be an acceptable alternative to augment air insufflation to meet the challenges of training posed by traditional air insufflation colonoscopy.
    MeSH term(s) Humans ; Colonoscopy/methods ; Cecum ; Insufflation/methods ; Water ; Prospective Studies ; Pilot Projects ; Abdominal Pain ; Polyps
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2023-09-01
    Publishing country United States
    Document type Observational Study ; Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 448460-5
    ISSN 1539-2031 ; 0192-0790
    ISSN (online) 1539-2031
    ISSN 0192-0790
    DOI 10.1097/MCG.0000000000001753
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Water assistance: also for sigmoidoscopy?

    Leung, Felix W

    Endoscopy international open

    2020  Volume 8, Issue 1, Page(s) E3–E5

    Language English
    Publishing date 2020-01-08
    Publishing country Germany
    Document type Editorial ; Comment
    ZDB-ID 2761052-4
    ISSN 2196-9736 ; 2364-3722
    ISSN (online) 2196-9736
    ISSN 2364-3722
    DOI 10.1055/a-0959-6057
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: To WE, or not to WE, that is the question.

    Leung, Felix W / Leung, Joseph W

    Gut

    2020  Volume 70, Issue 10, Page(s) 2009–2010

    MeSH term(s) Colonic Polyps ; Colonoscopy ; Humans
    Language English
    Publishing date 2020-11-17
    Publishing country England
    Document type Letter ; Comment
    ZDB-ID 80128-8
    ISSN 1468-3288 ; 0017-5749
    ISSN (online) 1468-3288
    ISSN 0017-5749
    DOI 10.1136/gutjnl-2020-323397
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Comparison of Right Colon Flat Polyp Detection Rate by Water Exchange Versus Water Immersion-pooled Results of Data File of 3 Published Reports.

    Leung, Felix W / Koo, Malcolm / Jia, Hui / Cadoni, Sergio / Hsieh, Yu-Hsi / Leung, Joseph W

    Journal of clinical gastroenterology

    2024  Volume 58, Issue 2, Page(s) 156–161

    Abstract: Goals: We tested the hypothesis that water exchange (WE) achieved a significantly higher right colon flat polyp detection rate (rFPDR) than water immersion (WI).: Background: Current endoscopy methods provide real-time morphology but not ... ...

    Abstract Goals: We tested the hypothesis that water exchange (WE) achieved a significantly higher right colon flat polyp detection rate (rFPDR) than water immersion (WI).
    Background: Current endoscopy methods provide real-time morphology but not histopathology. Flat serrated polyps are difficult to find during colonoscopy. In 2022 2 studies reported that the serrated polyp detection rate (SPDR) significantly inversely predicted the development of interval cancers. In 2021 1 systemic review with meta-analysis showed that WE, but not WI increased SPDR. The relative contributions of WE and WI on rFPDR are unknown.
    Study: Individual patient data from 3 reports comparing air insufflation, WI, and WE were pooled. Multiple logistic regression analysis was used to assess the factors associated with a higher rFPDR.
    Results: The pooled data showed that the rFPDR of air insufflation, WI, and WE were 15.4%, 14.1%, and 19.4% ( P =0.009), respectively. After adjusting for age and withdrawal time, multiple logistic regression analysis revealed that WE, when compared with WI, was significantly associated with a higher rFPDR (adjusted odds ratio[aOR]=1.53, P =0.002). Analysis of data on pathology and size were omitted to avoid duplicating our earlier publications.
    Conclusions: Significantly higher rFPDR was achieved by WE. Water exchange rather than WI merits consideration for use to maximize rFPDR. Removal of flat polyps, and by inference serrated polyps, ensures their optimal management to minimize the occurrence of interval cancers. The potential benefit of WE in maximizing SPDR and minimizing interval cancers deserves evaluation in long-term randomized controlled studies focused on flat polyps detection.
    MeSH term(s) Humans ; Adenoma/diagnosis ; Colon/pathology ; Colonic Polyps/diagnosis ; Colonic Polyps/pathology ; Colonoscopy/methods ; Colorectal Neoplasms/diagnosis ; Colorectal Neoplasms/pathology ; Immersion ; Information Storage and Retrieval ; Water ; Systematic Reviews as Topic ; Meta-Analysis as Topic
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2024-02-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 448460-5
    ISSN 1539-2031 ; 0192-0790
    ISSN (online) 1539-2031
    ISSN 0192-0790
    DOI 10.1097/MCG.0000000000001830
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Safety and effectiveness of underwater cold snare resection without submucosal injection of large non-pedunculated colorectal lesions.

    Yen, Andrew W / Leung, Joseph W / Koo, Malcom / Leung, Felix W

    Endoscopy international open

    2022  Volume 10, Issue 6, Page(s) E791–E800

    Abstract: Background and study ... ...

    Abstract Background and study aims
    Language English
    Publishing date 2022-06-10
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2761052-4
    ISSN 2196-9736 ; 2364-3722
    ISSN (online) 2196-9736
    ISSN 2364-3722
    DOI 10.1055/a-1784-4523
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  7. Article ; Online: Assessment of trainees' performance in colonoscopy.

    Leung, Felix W

    Gastrointestinal endoscopy

    2018  Volume 87, Issue 1, Page(s) 270–271

    MeSH term(s) Clinical Competence ; Colonoscopy ; Education, Medical, Graduate ; Humans
    Language English
    Publishing date 2018
    Publishing country United States
    Document type Editorial ; Comment
    ZDB-ID 391583-9
    ISSN 1097-6779 ; 0016-5107
    ISSN (online) 1097-6779
    ISSN 0016-5107
    DOI 10.1016/j.gie.2017.06.018
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Water assistance: also for sigmoidoscopy?

    Leung, Felix W

    Endoscopy International Open

    2020  Volume 08, Issue 01, Page(s) E3–E5

    Language English
    Publishing date 2020-01-01
    Publisher © Georg Thieme Verlag KG
    Publishing place Stuttgart ; New York
    Document type Article
    ZDB-ID 2761052-4
    ISSN 2196-9736 ; 2364-3722 ; 2196-9736
    ISSN (online) 2196-9736
    ISSN 2364-3722 ; 2196-9736
    DOI 10.1055/a-0959-6057
    Database Thieme publisher's database

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  9. Article: In split-dose prepared patients, water exchange could significantly improve overall and segmental bowel preparation scores and increase adenoma detection rate.

    Leung, Felix W

    Annals of gastroenterology

    2018  Volume 31, Issue 2, Page(s) 127–128

    Language English
    Publishing date 2018-02-08
    Publishing country Greece
    Document type Editorial
    ZDB-ID 2032850-3
    ISSN 1108-7471
    ISSN 1108-7471
    DOI 10.20524/aog.2018.0234
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  10. Article: Split-dose bowel preparation versus water exchange and adenoma detection rate: have we arrived there yet?

    Leung, Felix W

    Annals of gastroenterology

    2018  Volume 31, Issue 3, Page(s) 253–255

    Language English
    Publishing date 2018-04-18
    Publishing country Greece
    Document type Editorial
    ZDB-ID 2032850-3
    ISSN 1108-7471
    ISSN 1108-7471
    DOI 10.20524/aog.2018.0257
    Database MEDical Literature Analysis and Retrieval System OnLINE

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