Measuring polyp size using a virtual scale endoscope: a video tutorial with clinical case demonstration

Zarandi‐Nowroozi, Melissa; Renteln, Daniel von

doi:10.1055/a-1956-1714

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…Finally, the lesion size in this study was a post hoc analysis obtained from resected lesion measurement. Therefore, it is preferable to use lesion size measured under immediate endoscopy to predict risk, such as a virtual scale endoscope 32 . Unfortunately, there is no standard method to measure lesion size endoscopically, which requires future studies to focus on addressing it.…”

Section: Discussionmentioning

confidence: 99%

Lesion size affects the risk of technical difficulty in gastric endoscopic submucosal dissection

Zhao,

Pan,

Chen

et al. 2024

Sci Rep

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Current evidence shows an inter-country inconsistency in the effect of lesion size on the technical difficulty of gastric endoscopic submucosal dissection (ESD). We aimed to evaluate the specific correlation and quantify the ensuing risks. This retrospective study consisted of 405 ESD cases with gastric single lesion from April 2015 to April 2023. The correlation and risk prediction of lesion size with technical difficulty was explored to provide further clinical evidence. An additive generalized model and recursive algorithm were used to describe the non-linear association, and a linear two-piece regression was constructed to analyze the inflection point. Subgroup analysis and interaction were used to explore intergroup characteristics. Overall, difficult cases had larger lesion sizes, and the more significant the increase, the higher the risk of technical difficulty. In the full model, after adjusting for all covariates, each 1 mm, 3 mm, 5 mm, 7 mm, and one standard increase in lesion size increased the risk of technical difficulty by 8%, 26%, 42%, 72%, and 125%, respectively. There is a nonlinear positive correlation between lesion size and risk of technical difficulty, and the premeditated inflection point was 40 (mm) via two-piecewise linear regression and recursive algorithm. Subgroup analysis showed a stronger correlation between lesion size and difficult ESD in the upper site and submucosal fibrosis groups. Available evidence suggests that lesion size as a risk signal nonlinearly increases the technical difficulty of gastric ESD procedure, especially in cases of upper site and submucosal fibrosis, which deserves further investigation.

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Section: Discussionmentioning

confidence: 99%

Lesion size affects the risk of technical difficulty in gastric endoscopic submucosal dissection

Zhao,

Pan,

Chen

et al. 2024

Sci Rep

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“…Endoscopists were instructed to report the largest diameter of each polyp based on the allocated method during the colonoscopy. Technical details of VSE technology and its application to clinical cases have been previously described (10). In brief, VSE is a laser-based scale function integrated into a high-definition endoscope (ELUXEO system, Fujifilm, Tokyo, Japan) that creates an adaptive circular/linear virtual scale superimposed on the polyp when activated (16).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Recently, a laser-based measurement tool, integrated in a high-definition endoscope (virtual scale endoscope, VSE) has been introduced (10,11). VSE offers endoscopists a solution to activate a superimposed virtual scale during colonoscopies (10,11). Preclinical evaluations demonstrated that VSE accuracy is superior to visual and single-use device-based measurement methods (e.g., endoscopic forceps or ruler) (12,13).…”

Section: Introductionmentioning

confidence: 99%

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Measuring Size of Colorectal Polyps Using a Virtual Scale Endoscope or Visual Assessment: A Randomized Controlled Trial

Taghiakbari,

Djinbachian,

Haumesser

et al. 2023

Am J Gastroenterol

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Background: This study aimed to compare the accuracy of polyp size measurements using a virtual scale endoscope (VSE) with an integrated laser-based adaptive scale function and visual assessment (VA) during colonoscopies. Methods: We conducted a single-blinded, prospective randomized controlled trial. Eligible patients (aged 45-80 years) undergoing screening, surveillance or diagnostic colonoscopies were randomly assigned (1:1) into two groups. In the intervention group, all detected polyps were measured for size using VSE; in the control group, all polyps were measured using VA. Size measurements were compared to a reference standard of digital caliper measurement immediately post-polypectomy. The primary outcome was the relative accuracy of real-time VSE measurement compared to VA. Secondary outcomes included the mean differences and the correlations between VSE or VA sizes with the reference standard of measurement. Results: Overall, 230 patients were enrolled and randomized. The relative size measurement accuracy of VSE was 84% in 118 polyps, which was significantly higher than that of VA (105 polyps; 68.4%, p<0.001). VSE resulted in a significantly higher percentage of size measurements within 25% of true size compared to VA (81.4% vs. 41%, p<0.001). VSE had a significantly lower percentage for >5mm polyps incorrectly sized as 1–5mm compared to VA (13.5% vs. 57.1%; p<0.001) and a significantly lower percentage for >3mm polyps incorrectly sized as 1–3mm compared to VA (11.3% vs. 56.5%; p<0.001). Conclusions: VSE significantly improves the size measurement accuracy of colorectal polyps during colonoscopies compared to VA and results in fewer misclassifications at relevant decision-making size thresholds.

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Expert endoscopist assessment of colorectal polyp size using virtual scale endoscopy, visual or snare-based estimation: a prospective video-based study

Popescu Crainic,

Djinbachian,

Rex

et al. 2024

Scandinavian Journal of Gastroenterology

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Measuring polyp size using a virtual scale endoscope: a video tutorial with clinical case demonstration

Cited by 3 publications

References 5 publications

Lesion size affects the risk of technical difficulty in gastric endoscopic submucosal dissection

Lesion size affects the risk of technical difficulty in gastric endoscopic submucosal dissection

Measuring Size of Colorectal Polyps Using a Virtual Scale Endoscope or Visual Assessment: A Randomized Controlled Trial

Expert endoscopist assessment of colorectal polyp size using virtual scale endoscopy, visual or snare-based estimation: a prospective video-based study

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