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      Kinematic analysis of wrist motion during simulated colonoscopy in first-year gastroenterology fellows

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          Background and study aims: Gastroenterology trainees acquire skill and proficiency in performing colonoscopies at different rates. The cause for heterogeneous competency among the trainees is unclear. Kinematic analysis of the wrist joint while performing colonoscopy can objectively assess the variation in wrist motion. Our objective was to test the hypothesis that the time spent by the trainees in extreme ranges of wrist motion will decrease as the trainees advance through the fellowship year.

          Subjects and methods: Five first-year gastroenterology fellows were prospectively studied at four intervals while performing simulated colonoscopies. The setting was an endoscopy simulation laboratory at a tertiary care center. Kinematic assessment of wrist motion was done using a magnetic position/orientation tracker held in place by a custom-made arm sleeve and hand glove. The main outcome measure was time spent performing each of four ranges of wrist motion (mid, center, extreme, and out) for each wrist degree of freedom (pronation/supination, flexion/extension, and adduction/abduction).

          Results: There were no statistically significant differences in the time spent for wrist movements across the three degrees of freedom throughout the study period. However, fellows spent significantly less time in extreme range (1.47 ± 0.34 min vs. 2.44 ± 0.34 min, P = 0.004) and center range (1.02 ± 0.34 min vs 1.9 ± 0.34 min, P = 0.01) at the end of the study compared to the baseline evaluation. The study was limited by the small number of subjects and performance of colonoscopies on a simulator rather than live patients.

          Conclusions: Gastroenterology trainees alter the time spent at the extreme range of wrist motion as they advance through training. Endoscopy training during the first 10 months of fellowship may have beneficial effects on learning ergonomically correct motion patterns.

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          Most cited references 15

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          Objective evaluation of endoscopy skills during training.

          To evaluate the number of supervised gastrointestinal endoscopic procedures required to achieve initial competency using a simple objective grading system. Prospective, cross-sectional study. A gastroenterology and surgical training program at a large, university-affiliated county hospital. Seven gastroenterology fellows and five fourth-year surgery residents. Trainees were graded postprocedure using a microcomputer program. Grading criteria for esophagogastroduodenoscopy included entering the esophagus (esophageal intubation), traversing the pylorus into the duodenum, and recognizing whether the upper gastrointestinal tract was abnormal. Criteria for colonoscopy were traversing the splenic flexure, intubating the cecum, and recognizing whether the colon was abnormal. When presented with a case mix representative of practice, esophageal intubation did not reach 90% until more than 100 procedures had been done. Cecal intubation remained at only 84% after 100 procedures. More than 100 supervised upper gastrointestinal endoscopies or colonoscopies are necessary to achieve technical competence in gastrointestinal endoscopy.
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            Level of fellowship training increases adenoma detection rates.

            The adenoma detection rate (ADR) is critical to the success of colonoscopy for colorectal cancer screening. The effects of involving gastroenterology fellows in screening colonoscopies are uncertain. We assessed the effects of gastroenterology fellow participation on ADR and whether outcomes vary with year of fellowship training. We performed a retrospective review of all average-risk screening colonoscopies performed from April 2005-April 2007 at the University of Colorado Hospital. A gastroenterology attending physician alone performed 2895 colonoscopies; 699 were performed by a gastroenterology fellow supervised by an attending physician. Statistical analyses of polyp, adenoma, and advanced adenoma (or cancer) detection were performed by using logistic regression. The ADR was significantly higher (odds ratio [OR], 1.32; 95% confidence interval [CI], 1.10-1.59) among colonoscopies that included a gastroenterology fellow compared with those performed by only a gastroenterology attending physician. Similarly, the polyp detection rate was higher (OR, 1.28; 95% CI, 1.08-1.52) among colonoscopies involving a gastroenterology fellow. There was no difference in the detection of advanced adenomas or cancers (OR, 1.05; 95% CI, 0.77-1.44) among colonoscopies involving a gastroenterology fellow. The ADR differed greatly by year of training. Compared with colonoscopies performed by an attending gastroenterologist alone, the ADR increased with each year of training: OR, 0.89 (95% CI, 0.66-1.22) for first-year fellows; OR, 1.31 (95% CI, 0.89-1.93) for second-year fellows; and OR, 1.70 (95% CI, 1.33-2.17) for third-year fellows. Involvement of fellows in screening colonoscopies increases the ADR, primarily because of the increased ADR in procedures involving third-year gastroenterology fellows. Copyright (c) 2010 AGA Institute. Published by Elsevier Inc. All rights reserved.
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              Technical proficiency of trainees performing colonoscopy: a learning curve.

              We sought to provide an objective measure of the technical progress of trainees learning colonoscopy. GI fellows in our training program perform colonoscopy under supervision throughout their 2 years of fellowship. The frequency of fellows reaching the cecum in less than 30 minutes was determined by one endoscopy instructor during the last 7 months of their first year of training and during the last 7 months of their second year. The mean success rate of reaching the cecum for seven first-year fellows was 54% (individual range, 25% to 86%). This compared with 86% for six second-year fellows (individual range, 73% to 93%) and with 97% for the endoscopy instructor when he did procedures without a fellow. First-year fellows during the 7-month "testing" periods believed they had reached the cecum in 5.7% of cases in which they had not. This was not a problem with second-year fellows. Counting colonoscopies done with all instructors in our program, fellows in this series each did an average of 149 colonoscopies during their first-year of training and 328 by the end of their second. Increasing proficiency in reaching the cecum occurs with experience over time, and continues even after completion of formal training. Individual trainees also seem to learn colonoscopy at different rates. Depending on how one defines competency, it is possible that the minimum threshold number for technical competency in colonoscopy of 100 procedures, as suggested by the ASGE, may be low.

                Author and article information

                [1 ]Division of Gastroenterology, Mayo Clinic Arizona
                [2 ]Division of Health Sciences and Research, Mayo Clinic Arizona
                [3 ]School of Biological and Health Systems Engineering, Arizona State University, Tempe, Arizona
                Author notes
                Corresponding Author: Kevin C Ruff MD Division of Gastroenterology 13400 East Shea BoulevardScottsdale, AZ 85259480-301-6990480-301-6737 ruff.kevin@
                Endosc Int Open
                Endosc Int Open
                Endoscopy International Open
                © Georg Thieme Verlag KG (Stuttgart · New York )
                December 2015
                05 November 2015
                : 3
                : 6
                : E621-E626
                © Thieme Medical Publishers


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