UK key performance indicators and quality assurance standards for colonoscopy

Real-Time Computer-Aided Detection for colorectal neoplasia or only small polyps?

The adenoma detection rate is the constant subject of research and the main marker of quality in bowel cancer screening. However, by improving the quality of endoscopy via artificial intelligence methods, all polyps, including those with the potential for malignancy, can be removed, thereby reducing interval colorectal cancer rates. As such, the removal of all polyps may become the best marker of endoscopy quality. Thus, we present a viewpoint on integrating the computer-aided detection (CADe) of polyps with high-accuracy, real-time colonoscopy to challenge quality improvements in the performance of colonoscopy. Colonoscopy for bowel cancer screening involving the integration of a deep learning methodology (ie, integrating artificial intelligence with CADe systems) has been assessed in an effort to increase the adenoma detection rate. In this viewpoint, a few studies are described, and their results show that CADe systems are able to increase screening sensitivity. The detection of adenomatous polyps, which are associated with a potential risk of progression to colorectal cancer, and their removal are expected to reduce cancer incidence and mortality rates. However, so far, artificial intelligence methods do not increase the detection of cancer or large adenomatous polyps but contribute to the detection of small precancerous polyps.

Diagnostic Ability of High-definition Imaging Using Ultraslim Endoscopes in Early Gastric Cancer

PURPOSE

It is unclear whether high-definition (HD) imaging improves visibility and diagnostic ability in early gastric cancer (EGC) compared with standard-definition (SD) imaging. We aimed to compare the diagnostic performance and visibility scores of HD and SD ultraslim endoscopes in EGC.

MATERIALS AND METHODS

We used HD and SD ultraslim endoscopes to obtain 60 images with similar compositions of gastric environments. Of the 60 images, 30 showed EGC (15 images for each modality) and 30 showed no EGC (15 images for each modality). Seventeen endoscopists evaluated the presence and location of the lesions in each image. Diagnostic ability was compared between modalities. The color difference between a lesion and the surrounding mucosa (ΔE) was measured and compared between the modalities.

RESULTS

The ability of HD to detect EGC was significantly higher than that of SD (accuracy: 80.8% vs. 71.6%, P=0.017; sensitivity: 94.9% vs. 76.5%, P<0.001; positive predictive value, 76.2% vs. 55.3%, P<0.001; and negative predictive value (NPV), 94.1% vs. 73.5%, P<0.001). The ability of HD to determine the horizontal extent of EGC was significantly higher than that of SD (accuracy: 71.0% vs. 57.8%, P=0.004; sensitivity: 75.3% vs. 49.0%, P<0.001; NPV, 72.9% vs. 55.9%, P<0.001; and area under the curve: 0.891 vs. 0.631, P=0.038). The mean ΔE was significantly higher for HD than for SD (10.3 vs. 5.9, P=0.011).

CONCLUSIONS

The HD ultraslim endoscope showed a higher diagnostic performance in EGC than the SD endoscope because it provided good color contrast.

Child-Pugh B or C Cirrhosis Increases the Risk for Bleeding Following Colonoscopic Polypectomy

Background/Aims

The risk for colonoscopic postpolypectomy bleeding (PPB) in patients with chronic liver disease (CLD) remains unclear. We determined the incidence and risk factors for colonoscopic PPB in patients with CLD, especially those with liver cirrhosis.

Methods

We retrospectively reviewed the medical records of patients with CLD who underwent colonoscopic polypectomy at Seoul National University Hospital between 2011 and 2014. The study endpoints were immediate and delayed PPB.

Results

A total of 1,267 consecutive patients with CLD were included in the study. Immediate PPB occurred significantly more often in the Child-Pugh (CP) B or C cirrhosis group (17.5%) than in the CP-A (6.3%) and chronic hepatitis (4.6%) groups (p<0.001). Moreover, the incidence of delayed PPB in the CP-B or C cirrhosis group (4.4%) was significantly higher than that in the CP-A (0.7%) and chronic hepatitis (0.2%) groups (p<0.001). The independent risk factors for immediate PPB were CP-B or C cirrhosis (p=0.011), a platelet count <50,000/μL (p<0.001), 3 or more polyps (p=0.017), endoscopic mucosal resection or submucosal dissection (p<0.001), and polypectomy performed by trainees (p<0.001). The independent risk factors for delayed PPB were CP-B or C cirrhosis (p=0.009), and polyps >10 mm in size (p=0.010).

Conclusions

Patients with CP-B or C cirrhosis had an increased risk for bleeding following colonoscopic polypectomy.

The impact of language and ethnicity on preparation for endoscopy: A prospective audit of an East London Hospital Ward

RATIONALE, AIMS, AND OBJECTIVES

The efficacy, cost-effectiveness, and safety of a number of endoscopic procedures are largely dependent on optimal preparation. Despite this however, inadequate or suboptimal preparation is relatively common. Most studies have revealed inadequate preparation for between 20% and 30% of patients. This audit sought to examine the impact of English language proficiency, and ethnicity, on endoscopic preparation and procedure success or failure.

METHOD

A prospective audit was developed. Using convenience sampling, participants were consecutive patients recruited over a six-month period, who were aged 18 and over, attending an east London endoscopy ward for a routine (pre-booked) endoscopy procedure for which they had received preparation instructions to carry out at home.

RESULTS

Almost one-third of the sample had adequate or very poor English proficiency. When an interpreter was used it was overwhelmingly a member of the patients' family or a member of staff. There was no significant relationship between gender, age, ethnic group, English language proficiency, whether an interpreter was needed, the type of procedure carried out and inadequate preparation.

CONCLUSIONS

Amongst these patients, we found that a little more than 20% of participants were inadequately prepared for their endoscopic procedure. We found no relationship between language proficiency on preparation. Given the mixed literature on interventions to improve preparation before endoscopic procedures, further directions are identified to work toward the development and testing of a novel intervention amongst this population. In identifying those who may be at risk for inadequate preparation for endoscopic procedures, practice needs to take into account a range of factors beyond language and ethnicity. Furthermore, the persistent reliance on family members to interpret information sheets and preparation advice suggests that revision and/or development of culture and language-specific materials is necessary.

Clinical care pathway program versus open-access system: a study on appropriateness, quality, and efficiency in the delivery of colonoscopy in the colorectal cancer

Open-access colonoscopy (OAC), whereby the colonoscopy is performed without a prior office visit with a gastroenterologist, is affected by inappropriateness which leads to overprescription and reduced availability of the procedure in case of alarming symptoms. The clinical care pathway (CCP) is a healthcare management tool promoted by national health systems to organize work-up of various morbidities. Recently, we started a CCP dedicated to colorectal cancer (CRC), including a colonoscopy session for CRC diagnosis and prevention. We aimed to evaluate the appropriateness, the quality, and the efficiency in the delivery of colonoscopy with the open-access system and a CCP program in the CRC. Quality indicators for colonoscopy in subjects in the CCP were compared to referrals by general practitioners (OAC) or by non-gastroenterologist physicians (non-gastroenterologist physician colonoscopy, NGPC). Attendance rate to colonoscopy was greater in the CCP group and NGPC group than in the OAC group (99%, 99%, and 86%, respectively). Waiting time in the CCP group was shorter than in the OAC group (3.88 ± 2.27 vs. 32 ± 22.31 weeks, respectively). Appropriateness of colonoscopy prescription was better in the CCP group than in the OAC group (92 vs. 50%, respectively). OAC is affected by the lack of timeliness and low appropriateness of prescription. A CCP reduces the number of inappropriate colonoscopies, especially for post-polypectomy surveillance, and improves the delivery of colonoscopy in patients requiring a fast-track examination. The high rate of inappropriate OAC suggests that this modality of healthcare should be widely reviewed.

Diagnostic Accuracy of Artificial Intelligence and Computer-Aided Diagnosis for the Detection and Characterization of Colorectal Polyps: Systematic Review and Meta-analysis

BACKGROUND

Colonoscopy reduces the incidence of colorectal cancer (CRC) by allowing detection and resection of neoplastic polyps. Evidence shows that many small polyps are missed on a single colonoscopy. There has been a successful adoption of artificial intelligence (AI) technologies to tackle the issues around missed polyps and as tools to increase the adenoma detection rate (ADR).

OBJECTIVE

The aim of this review was to examine the diagnostic accuracy of AI-based technologies in assessing colorectal polyps.

METHODS

A comprehensive literature search was undertaken using the databases of Embase, MEDLINE, and the Cochrane Library. PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines were followed. Studies reporting the use of computer-aided diagnosis for polyp detection or characterization during colonoscopy were included. Independent proportions and their differences were calculated and pooled through DerSimonian and Laird random-effects modeling.

RESULTS

A total of 48 studies were included. The meta-analysis showed a significant increase in pooled polyp detection rate in patients with the use of AI for polyp detection during colonoscopy compared with patients who had standard colonoscopy (odds ratio [OR] 1.75, 95% CI 1.56-1.96; P<.001). When comparing patients undergoing colonoscopy with the use of AI to those without, there was also a significant increase in ADR (OR 1.53, 95% CI 1.32-1.77; P<.001).

CONCLUSIONS

With the aid of machine learning, there is potential to improve ADR and, consequently, reduce the incidence of CRC. The current generation of AI-based systems demonstrate impressive accuracy for the detection and characterization of colorectal polyps. However, this is an evolving field and before its adoption into a clinical setting, AI systems must prove worthy to patients and clinicians.

TRIAL REGISTRATION

PROSPERO International Prospective Register of Systematic Reviews CRD42020169786; https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42020169786.

Endoscopy to Diagnose and Prevent Digestive Cancers in Lynch Syndrome

Lynch syndrome patients could benefit from various recommendations to prevent digestive cancers. In this review, we summarize the criteria to identify Lynch syndrome in patients with digestive cancers. We detail endoscopic screening procedures in patients with Lynch syndrome for gastric, small bowel, pancreatic, and colorectal cancers. We review the precise modalities of endoscopic follow-up, particularly the discrepancies that exist between the guidelines of the various scientific societies. We discuss the treatment of colorectal cancers in Lynch syndrome cases and patient adherence to endoscopic follow-up programs.

Impact of the National Endoscopy Database (NED) on colonoscopy withdrawal time: a tertiary centre experience

OBJECTIVE

Colonoscopy withdrawal time (CWT) is a key performance indicator affecting polyp detection rate (PDR) and adenoma detection rate (ADR). However, studies have shown wide variation in CWT and ADR between different endoscopists. The National Endoscopy Database (NED) was implemented to enable quality assurance in all endoscopy units across the UK and also to reduce variation in practice. We aimed to assess whether CWT changed since the introduction of NED and whether CWT affected PDR.

METHODS

We used NED to retrospectively collect data regarding CWT and PDR of 25 endoscopists who performed (n=4459 colonoscopies) in the four quarters of 2019. We then compared this data to their performance in 2016, before using NED (n=4324 colonoscopies).

RESULTS

Mean CWT increased from 7.66 min in 2016 to 9.25 min in 2019 (p=0.0001). Mean PDR in the two periods was 29.9% and 28.3% (p=0.64). 72% of endoscopists (18/25) had CWT>6 min in 2016 versus 100% (25/25) in 2019, the longer CWT in 2019 positively correlated with the PDR (r=0.50, p=0.01). Gastroenterology consultants and trainee endoscopists had longer CWT compared with colorectal surgeons both before and after using NED.

CONCLUSION

NED usage increased withdrawal times in colonoscopy. Longer withdrawal times were associated with higher PDR. A national colonoscopy audit using data from NED is required to evaluate whether wide variations in practice across endoscopy units in the UK still exist and to ensure minimum colonoscopy quality standards are achieved.

Weekend and evening planned colonoscopy activity: a safe and effective way to meet demands

Background and study aims  Colonoscopy is the "gold standard" investigation for assessment of the large bowel that detects and prevents colorectal cancer, as well as non-neoplastic conditions. The Joint Advisory Group (JAG) on Gastrointestinal Endoscopy recommends monitoring key performance indicators such as cecal intubation rate (CIR) and adenoma detection rate (ADR). We aimed to investigate the quality of colonoscopies carried out during evening and Saturday lists in our unit and compare them against JAG standards of quality for colonoscopies. Patients and methods  We retrospectively collected and analyzed demographical and procedure-related data for non-screening colonoscopies performed between January 2016 and November 2018. Evenings and Saturdays were defined as the out-of-hour (OOH) period. We compared the outcomes of the procedures done in these against the working hours of the weekdays. We also wanted to explore whether the outcomes were different among certain endoscopists. Other factors that could affect the KPIs, such as endoscopist experience and bowel preparation, were also analyzed. Results  There were a total of 17634 colonoscopies carried out; 56.9 % of the patients (n = 10041) < 70 years old. Key Performance Indicators (KPIs) of weekday, evening, and Saturday colonoscopies regarding the CIR and ADR met the JAG standards as they were above 93 % and 24 %, respectively. Advanced colonoscopists had better KPIs when compared to the non-advanced colonoscopists, with CIR at 97.6 % vs. 93.2 % and ADR at 40.8 % vs. 26 %, respectively. Conclusions  JAG standards were maintained during colonoscopies done on weekdays, evenings, and Saturdays. Advanced colonoscopists had higher CIR and ADRs.

Colonoscopy quality indicators in patients with and without prior colonic resection: A single-centre prospective comparative study

AIM

Effective colonoscopy relies on meeting rigorous quality control thresholds. Some earlier studies evaluating colonoscopy key performance indicators (KPIs) have excluded patients who have previously undergone colonic resection (i.e., they have a nonintact colon); such patients also deserve high-quality colonoscopy. This study aimed to compare colonoscopy KPIs between patients with nonintact and intact colons.

METHOD

Consecutive colonoscopies performed at Whanganui Hospital (New Zealand) between September 2016 and March 2020 were included. The primary outcome was the caecal or ileal intubation rate (CIIR). Secondary outcomes were the adenoma detection rate (ADR), polyp detection rate (PDR), colonoscope withdrawal time (CWT) and caecal or ileal intubation time (CIIT).

RESULTS

In total, 3017 colonoscopies were performed: 322 in nonintact colons and 2695 in intact colons. CIIR was significantly higher in nonintact than in intact colons (98.4% vs. 95.0%; P = 0.0086). When all colonoscopies were included, the CIIR was 95.4%; this value decreased to 95.0% when nonintact colonoscopies were excluded. However, the ADR (39.9% vs. 38.8%; P = 0.77) and PDR (58.4% vs. 59.1%; P = 0.86) were similar for both nonintact and intact colons. CWT (P < 0.0001) and CIIT (P < 0.0001) were significantly shorter in participants with nonintact colons.

CONCLUSION

The CIIR exceeded recommended targets and was 3.4% higher in patients with nonintact than intact colons. Patients with nonintact colons comprise a small proportion of the overall colonoscopy cohort and it is unlikely that this small difference is relevant for most endoscopists or endoscopy units. The ADR and PDR were similar among patients with nonintact and intact colons, despite nonintact colonoscopies being significantly quicker. Patients with nonintact colons deserve high-quality colonoscopy and therefore their KPIs should be included in colonoscopy performance reports.

Meeting the new joint British Society of Gastrointestinal and Abdominal Radiology and Royal College of Radiologists CT colonography standards: a 6-year experience

AIM

To audit the performance of computed tomography colonography (CTC) at St Mark's Hospital against the joint British Society of Gastrointestinal and Abdominal Radiology (BSGAR) and Royal College of Radiologists (RCR) standards.

MATERIALS AND METHODS

A retrospective audit of all CTC studies between January 2012 to December 2017 was performed against the BSGAR/RCR standards along with additional data outwith the guidelines. Evidence was obtained from a central database, radiology information systems (RISs), picture archiving and communication systems (PACSs), and electronic patient records (EPRs).

RESULTS

Over the 6 years, 13,143 CTCs were performed and 12,996 (99%) were adequate or better. Of the cases 1,867 had a >6 mm polyp or cancer reported (polyp identification rate [PIR] 14%) and the positive predictive value (PPV) was 93% (1,148/1,240). Median radiation dose was 458 mGy·cm, mean additional acquisition rate was 19% (2,505/13,143), subsequent endoscopy rate was 9% (1,222/13,143) and mean interpretation time for a negative study was 34.6 minutes. Nine perforations occurred (perforation rate of 0.068%) and one was symptomatic (symptomatic perforation rate of 0.008%). For suspected cancers, the same-day endoscopy rate was 27% (96/360) and same-day staging rate was 76% (272/360). Post-imaging colorectal cancer rates (PICRC) was 3.06 per 100 cancers detected and 0.23 per 1,000 CTCs. The service was always rated "good" or higher by patients.

CONCLUSION

This audit shows the CTC service at St Mark's Hospital to be safe and of sufficiently high quality to meet the BSGAR/RCR standards with most outcomes equal to or above the aspirational target. Areas for service and individual reader improvement were also identified.

Comprehensive evaluation of the learning curve to achieve satisfactory adenoma detection rate

BACKGROUND AND AIM

The number of colonoscopies required to reach satisfactory adenoma detection rate (ADR) is not well established. The aim of this study was to identify the appropriate number of procedures required to attain satisfactory ADR for those well-trained endoscopists who have a cecal intubation rate (CIR) ≥ 90% and start to perform colonoscopy independently.

METHODS

All endoscopists with compelete independent colonoscopy data during career in our database were enrolled. The number of procedures required to achieve ADR ≥ 20% was identified by cumulative summation (Cusum), learning curve Cusum (LC-Cusum), and moving average method. Mixed effect logistic regression model was developed to determine the relationship between endoscopist as well as patient-related factors and adenoma detection.

RESULTS

A total of 24 943 procedures and 14 endoscopists were enrolled. By Cusum analysis, the interest point was at 207 procedures. By LC-Cusum analysis, 71% (10/14) and 86% (12/14) of endoscopists had attained satisfactory ADR after 200 and 300 procedures, respectively. By moving average method, endoscopists reached a mean ADR of 20% at 216 and 261 procedures over blocks of 50 and 100 procedures, respectively. The total number of procedures, number of daily procedures, patient age and gender, bowel preparation, sedation, and diverticulosis were significantly associated with adenoma detection.

CONCLUSIONS

This is the first study to investigate the learning curve of ADR for those well-trained endoscopists who have a CIR ≥ 90% and start to perform colonoscopy independently. Two hundred procedures might be an optimal number required to reach an ADR ≥ 20%.

Lower gastrointestinal polypectomy competencies in the United Kingdom: a retrospective analysis of Directly Observed Polypectomy Skills (DOPyS)

BACKGROUND

Polypectomy is often the most hazardous part of colonoscopy. There is significant variability in polypectomy training and assessment internationally. DOPyS (Directly Observed Polypectomy Skills) is a validated assessment tool and is used to demonstrate polypectomy competency in the UK. This study aimed to describe the learning curve for polypectomy competency in UK trainees.

METHODS

Retrospective DOPyS data (January 2009 to September 2015) were obtained from the UK Joint Advisory Group (JAG) for intestinal endoscopy training system (JETS) national database. The number of lower gastrointestinal (LGI) procedures, overall cecal intubation rate (CIR), procedure intensity, and time in days to the first DOPyS assessment were recorded, and time to JAG certification was calculated.

RESULTS

4965 DOPyS assessments from 336 trainees were analyzed. Within the study period, 124 and 53 trainees achieved provisional and full colonoscopy certification, respectively. Trainees started formative assessment of polypectomy after > 130 LGI procedures and with a CIR of > 70 %. Within 3 years from the first DOPyS assessment, 94 % of trainees achieved provisional certification, and 50 % full certification. Higher procedure intensity at baseline DOPyS assessment was associated with a higher likelihood of obtaining certification sooner.

CONCLUSION

There is a significant variation in time to competency, and this potentially reflects the time necessary to acquire polypectomy skills. There is a need to start polypectomy training earlier, once sufficient skills, such as tip control, have been achieved to shorten the time to competency. Overall, the CIR could be used as a guide for such technical skills. Increasing exposure to training lists also potentially reduces the time to polypectomy competency.

Evaluation of a novel colonoscope offering flexibility adjuster - a retrospective observational study

BACKGROUND

Although colonoscopy is the gold standard for colorectal cancer screening, colonic looping may make complete colonoscopy challenging. Commonly available stiffening device colonoscopy has been described as helpful but not effective enough to prevent looping. In this context the effect on cecal intubation time and rate was described differently in various studies and in some studies had no impact on cecal intubation time at all. The aim of this study was to evaluate whether a novel colonoscope with gradual stiffness (Fujifilm EC760R-V/I- flexibility adjuster, Tokyo, Japan) using four significantly different grades of stiffness can be an alternative to established devices in terms of loop prevention, cecal intubation rate and time, adverse events, and patient/examiner satisfaction.

METHODS

Consecutive patients without previous colorectal surgery were analyzed retrospectively. Colonoscopy was performed with the new colonoscope and performance characteristics, including time to cecum, withdrawal time, total examination time, and patient and endoscopist satisfaction were recorded.

RESULTS

Among 180 consecutive procedures, 98.3% of examinations were complete to the cecum. The endoscopic flexibility adjuster was used in 150 of 180 cases (83.3%). Overall, the device was scored by the examiner as helpful to prevent looping in 146 of the 150 cases (97.7%). Mean cecal intubation time was 6.5 min, with 35% of examination performed in under 5 min with a mean withdrawal time of 7 min. Mean total examination time was 18 min. Patient satisfaction was rated as high in all examinations performed.

CONCLUSION

The new flexibility adjuster colonoscope was shown to be helpful in loop prevention, allowed for fast and successful cecal intubation, and led to a high rate of patients satisfaction.

Joint Advisory Group on Gastrointestinal Endoscopy (JAG) framework for managing underperformance in gastrointestinal endoscopy

Underperformance can be defined as performance which persistently falls below a desired minimum standard considered acceptable for patient care. Within gastrointestinal endoscopy, underperformance may be multifactorial, related to an individual's knowledge, skills, attitudes, health or external factors. If left unchecked, underperformance has the potential to impact on care and ultimately patient safety. Managing underperformance should be a key attribute of high-quality endoscopy service, as recognised in the Joint Advisory Group on Gastrointestinal Endoscopy (JAG) accreditation process. However, it is recognised that not all services have robust mechanisms to do this. This article provides the JAG position on managing underperformance in endoscopy, defined through a practical framework. This follows a stepwise process of detecting underperformance, verification, identification of additional causative factors, providing support and reassessment. Detection and verification of issues may require use of multiple evidence sources, including performance data, feedback and appraisal reports. Where technical underperformance is identified, this should be risk stratified by potential risk to patient safety. Support should be tailored to each individual case based on the type of underperformance detected, any causative factors with an action plan developed. Support may include coaching, mentoring, training and upskilling. Wider support from the medical director's office or external services may also be required. Monitoring and reassessment is a crucial part of the overall process.

Splenic haematoma: a rare complication of colonoscopy

Colonoscopy is the gold-standard tool to investigate the colon which also allows to biopsy or treat intraluminal pathologies. About 900 000 colonoscopies are performed annually in UK. It is considered a relatively safe procedure; however, some serious complications might take place. The common complications of colonoscopy are bleeding and perforation. Splenic injury is a rare complication of colonoscopy which can be fatal. Our case report describes a grade two subscapular splenic haematoma after routine colonoscopy that has been managed conservatively.

A colorectal straight-to-test cancer pathway with general-practitioner-guided triage improves attainment of the 28-day diagnosis target and increases outpatient clinic capacity

AIM

This study investigates whether a straight-to-test (STT) colorectal cancer pathway improves attainment of the National Health Service (NHS) England 28-day Faster Diagnosis Standard and the effect of the pathway on reducing face-to-face outpatient clinic appointments. Patient satisfaction and the safety of a novel general practitioner (GP) led patient triage system regarding suitability for colonoscopy are also evaluated.

METHODS

This is an observational study of all patients managed via an STT colorectal cancer pathway between 1 September 2019 and 19 March 2020. Comparison is made with all patients referred on the suspected colorectal cancer pathway prior to implementation of the STT pathway from 1 January 2019 to 30 July 2019. Patient satisfaction with the STT pathway was assessed with a telephone-based questionnaire.

RESULTS

Attainment of the 28-day diagnosis target for all suspected colorectal cancer referrals improved following the establishment of the STT pathway (88% vs. 82%, P < 0.0001). From a potential total of 548 outpatient colorectal clinic appointments for patients on the STT pathway, 504 (92%) were avoided. In those eligible for the STT pathway, GP assessment of patients suitable for colonoscopy agreed with that of the colorectal department in 93% of cases. Of the 50 patients who undertook the satisfaction survey, 86% were satisfied or very satisfied with the pathway. No patient suffered adverse events as a result of their STT investigations.

CONCLUSION

An STT pathway for suspected colorectal cancer referrals with novel GP-led patient triage safely streamlines patients through the suspected colorectal cancer diagnostic pathway and significantly reduces requirement for face-to-face outpatient clinic attendance. This is achieved with high patient satisfaction.

Colorectal Cancer Screening and Surveillance for Non-Hereditary High-Risk Groups—Is It Time for a Re-Think?

Purpose of review

Colorectal cancer (CRC) is the second most common cause of cancer death worldwide, killing approximately 900,000 people each year. An individual’s risk of developing CRC is multi-factorial with known risk factors including increasing age, male sex, family history of CRC and raised body mass index. Population-based screening programmes for CRC exist in many countries, and in the United Kingdom (UK), screening is performed through the NHS Bowel Cancer Screening Programme (BCSP). Screening programmes offer a population-based approach for those at “average risk”, and do not typically offer enhanced screening for groups at increased risk. In the UK, such patients are managed via non-screening symptomatic services but in a non-systematic way.

Recent findings

There is growing evidence that conditions such as cystic fibrosis and a history of childhood cancer are associated with higher risk of CRC, and surveillance of these groups is advocated by some organizations; however, national recommendations do not exist in most countries.

Summary

We review the evidence for screening “high risk” groups not covered within most guidelines and discuss health economic issues requiring consideration acknowledging that the demand on colonoscopy services is already overwhelming.

Guidelines for accreditation of endoscopy units: quality measures from the Korean Society of Coloproctology

Purpose

Colonoscopy is an effective method of screening for colorectal cancer (CRC), and it can prevent CRC by detection and removal of precancerous lesions. The most important considerations when performing colonoscopy screening are the safety and satisfaction of the patient and the diagnostic accuracy. Accordingly, the Korean Society of Coloproctology (KSCP) herein proposes an optimal level of standard performance to be used in endoscopy units and by individual colonoscopists for screening colonoscopy. These guidelines establish specific criteria for assessment of safety and quality in screening colonoscopy.

Methods

The Colonoscopy Committee of the KSCP commissioned this Position Statement. Expert gastrointestinal surgeons representing the KSCP reviewed the published evidence to identify acceptable quality indicators and indicators that lacked sufficient evidence.

Results

The KSCP recommends an optimal standard list for quality control of screening colonoscopy in the following 6 categories: training and competency of the colonoscopist, procedural quality, facilities and equipment, performance indicators and auditable outcomes, disinfection of equipment, and sedation and recovery of the patient.

Conclusion

The KSCP recommends that endoscopy units performing CRC screening evaluate 6 key performance measures during daily practice.

Equity of colonoscopy provision and quality in Māori and New Zealand Europeans: a comparative retrospective study

BACKGROUND

High-quality colonoscopy is essential for investigating suspected colorectal cancer and relies on endoscopists meeting key performance indicator (KPI) targets. The rising demand for colonoscopy raises concerns that Māori populations could be under-served. This study aimed to compare rates of colonoscopy provision and colonoscopy KPIs between Māori and New Zealand (NZ) European patients.

METHODS

This retrospective comparative study was conducted at Whanganui Hospital (NZ). Consecutive colonoscopies performed between September 2016 and March 2020 were included. Primary outcome was the rate of colonoscopy provision for the population. Secondary outcomes were the colonoscopy completion rate (CCR), colonoscope withdrawal time (CWT), polyp detection rate (PDR) and adenoma detection rate (ADR). Subgroup analysis of ADR in index symptomatic colonoscopies was also performed.

RESULTS

A total of 2962 colonoscopies were analysed (385 Māori; 2577 NZ European). Rates of colonoscopy provision in participants aged ≥40 were significantly lower among Māori (6.1% versus 9.1%; P < 0.0001). The CCR (P = 1.00), CWT (P = 0.28) and PDR (P = 0.24) were similar. Whilst the ADR in the overall cohort was significantly lower in Māori (32.7% versus 40.0%; P = 0.028), this was not observed when stratified by 10-year age cohorts. The ADR was similar on subgroup analysis of index symptomatic colonoscopies (P = 0.42).

CONCLUSIONS

This study found inequities in access to colonoscopy services for Māori compared to NZ European patients. Among those that did receive colonoscopy, there were no differences in colonoscopy quality after age stratification. Improving equity will require the addition of colonoscopy provision rates to other mandatory KPIs and reporting these by ethnicity in all endoscopy units.

Monitoring photographic proof of cecal intubation: A closed-loop audit of best practice colonoscopy

Gold standard colonoscopy in the UK demands a 90% cecal intubation (CI) rate. Endoscopists must provide photographic evidence of CI, which can include images of the terminal ileum, appendix orifice, anastomosis or ileocecal valve. Whilst photographic proof of intubation should be obtained for all complete colonoscopies, this is not routinely audited. Three hundred and ninety-six complete colonoscopies were analyzed, 200 in an initial audit, and 196 in a second audit. Photos taken during colonoscopy were reviewed for evidence of successful CI, as well as whether these photographs had been marked as "proof of intubation" (POI). Results were shared at departmental governance meetings in order to assess any improvement in practice. Initial audit revealed 70% of colonoscopies had provided sufficient proof of CI but only 50% provided photographs that were described as such. Twenty percent of colonoscopies provided sufficient images, but these were not identified as POI. Thirty percent of all colonoscopies provided insufficient proof of CI. Upon repeat audit, 71% of colonoscopies met best practice standards, with the remaining 29% showing insufficient evidence of CI. In the modern era of digital technology, lack of photographic evidence should be seen as unacceptable and may raise important clinical and medicolegal concerns. We recommend that audits such as this become standard practice to ensure best practice.

Implementation of colonoscopy quality monitoring in a Belgian university hospital with integrated computer-based extraction of adenoma detection rate

Background and study aims  Quality in colonoscopy has been promoted in last decade with definition of different quality indicators (QI) as benchmarks. Currently, automatized monitoring systems are lacking, especially for merging pathologic and endoscopic data, which limits quality monitoring implementation in daily practice. We describe an adapted endoscopy reporting system that allows continuous QI recording, with automatic pathological data inclusion. Material and methods  We locally adapted a reporting system for colonoscopy by adding and structuring in a dedicated tab selected key QI. Endoscopic data from a reporting system and pathological results were extracted and merged in a separate database. During the initial period of use, performing physicians were encouraged to complete the dedicated tab on a voluntary basis. In a second stage, completing of the tab was made mandatory. The completeness of QI recording was evaluated across both periods. Performance measures for all endoscopists were compared to global results for the department and published targets. Results  During the second semester of 2017, a total of 1827 colonoscopies were performed with a QI tab completed in 100 % of cases. Among key QI, the cecal intubation rate was 93.8 %, the rate of colonoscopies with adequate preparation was 90.7 %, and the adenoma detection rate was 29.8 % considering all colonoscopies, irrespective of indication; 28.8 % considering screening procedures; and 36.6 % in colonoscopies performed in people older than age 50 years. Conclusion  This study shows that quality monitoring for colonoscopy can be easily implemented with limited human resources by adapting a reporting system and linking it to a pathology database.

Quality performance measures for small capsule endoscopy: Are the ESGE quality standards met?

Background and study aims  The European Society of Gastrointestinal Endoscopy (ESGE) recently issued a quality performance measures document for small bowel capsule endoscopy (SBCE). The aim of this nationwide survey was to explore SBCE practice with ESGE quality measures as a benchmark. Patients and methods  A dedicated per-center semi-quantitative questionnaire based on ESGE performance measures for SBCE was created by a group of SBCE experts. One-hundred-eighty-one centers were invited to participate and were asked to calculate performance measures for SBCE performed in 2018. Data were compared with 10 ESGE quality standards for both key and minor performance measures. Results  Ninety-one centers (50.3 %) participated in the data collection. Overall in the last 5 years (2014-2018), 26,615 SBCEs were performed, 5917 of which were done in 2018. Eighty percent or more of the participating centers reached the minimum standard established by the ESGE Small Bowel Working Group (ESBWG) for four performance measures (indications for SBCE, complete small bowel evaluation, diagnostic yield and retention rate). Conversely, compliance with six minimum standards established by ESBWG concerning adequate bowel preparation, patient selection, timing of SBCE in overt bleeding, appropriate reporting, reading protocols and referral to device-assisted enteroscopy was met by only 15.5 %, 10.9 %, 31.1 %, 67.7 %, 53.4 %, and 32.2 % of centers, respectively. Conclusions  The present survey shows significant variability across SBCE centers; only four (4/10: 40 %) SBCE procedural minimum standards were met by a relevant proportion of the centers ( ≥ 80 %). Our data should help in identifying target areas for quality improvement programs in SBCE.

The Association of Coloproctology of Great Britain and Ireland consensus guidelines in emergency colorectal surgery

AIM

There is a requirement for an expansive and up to date review of the management of emergency colorectal conditions seen in adults. The primary objective is to provide detailed evidence-based guidelines for the target audience of general and colorectal surgeons who are responsible for an adult population and who practise in Great Britain and Ireland.

METHODS

Surgeons who are elected members of the Association of Coloproctology of Great Britain and Ireland Emergency Surgery Subcommittee were invited to contribute various sections to the guidelines. They were directed to produce a pathology-based document using literature searches that were systematic, comprehensible, transparent and reproducible. Levels of evidence were graded. Each author was asked to provide a set of recommendations which were evidence-based and unambiguous. These recommendations were submitted to the whole guideline group and scored. They were then refined and submitted to a second vote. Only those that achieved >80% consensus at level 5 (strongly agree) or level 4 (agree) after two votes were included in the guidelines.

RESULTS

All aspects of care (excluding abdominal trauma) for emergency colorectal conditions have been included along with 122 recommendations for management.

CONCLUSION

These guidelines provide an up to date and evidence-based summary of the current surgical knowledge in the management of emergency colorectal conditions and should serve as practical text for clinicians managing colorectal conditions in the emergency setting.

Artificial intelligence for non-polypoid colorectal neoplasms

The miss rate of flat advanced colorectal neoplasia is still unacceptably high, especially in the Western setting, notwithstanding the widespread implementation of quality improvement programs and training. It is well known that flat morphology is associated with miss rate of colorectal neoplasia, and that this subset of lesions often shows a more aggressive biological behaviour. Artificial intelligence (AI) applied to the detection of colorectal neoplasia has been shown to increase adenoma detection rate, consistently across all lesion sizes and locations in the colon. However, there is still uncertainty whether AI can reduce the miss rate of flat advanced neoplasia, mainly because all published trials report a low number of flat colorectal lesions in their training sets, and this could reduce AI accuracy for this subset of lesions. In addition, flat lesions have different morphologies with variable prevalence and potentially different accuracy in their detection. For example, the subtle appearance and rarer frequency of a non-granular laterally spreading tumor (LST) could be much harder to identify than a granular mixed LST. In this review, we present a summary of the evidence on the role of AI in the identification of colorectal flat neoplasia, with a focus on data regarding presence of LSTs in the training/validation sets of the AI systems currently available on the market.

Development and Validation of an Automatic Image-Recognition Endoscopic Report Generation System: A Multicenter Study

INTRODUCTION:

Conventional gastrointestinal (GI) endoscopy reports written by physicians are time consuming and might have obvious heterogeneity or omissions, impairing the efficiency and multicenter consultation potential. We aimed to develop and validate an image recognition–based structured report generation system (ISRGS) through a multicenter database and to assess its diagnostic performance.

Methods:

First, we developed and evaluated an ISRGS combining real-time video capture, site identification, lesion detection, subcharacteristics analysis, and structured report generation. White light and chromoendoscopy images from patients with GI lesions were eligible for study inclusion. A total of 46,987 images from 9 tertiary hospitals were used to train, validate, and multicenter test (6:2:2). Moreover, 5,699 images were prospectively enrolled from Qilu Hospital of Shandong University to further assess the system in a prospective test set. The primary outcome was the diagnosis performance of GI lesions in multicenter and prospective tests.

Results:

The overall accuracy in identifying early esophageal cancer, early gastric cancer, early colorectal cancer, esophageal varices, reflux esophagitis, Barrett’s esophagus, chronic atrophic gastritis, gastric ulcer, colorectal polyp, and ulcerative colitis was 0.8841 (95% confidence interval, 0.8775–0.8904) and 0.8965 (0.8883–0.9041) in multicenter and prospective tests, respectively. The accuracy of cecum and upper GI site identification were 0.9978 (0.9969–0.9984) and 0.8513 (0.8399–0.8620), respectively. The accuracy of staining discrimination was 0.9489 (0.9396–0.9568). The relative error of size measurement was 4.04% (range 0.75%–7.39%).

DISCUSSION:

ISRGS is a reliable computer-aided endoscopic report generation system that might assist endoscopists working at various hospital levels to generate standardized and accurate endoscopy reports (http://links.lww.com/CTG/A485).

Split-Dose Regimen With Bisacodyl Increases the Quality of Bowel Preparation for Colonoscopy

The aim of the present study was to compare 2 different bowel preparations procedures (split-dose with PicoPrep and bisacodyl vs. same-day preparation with PicoPrep) in patients undergoing colonoscopy with regard to quality of bowel preparation, compliance, and willingness to repeat. A retrospective quasi-experimental investigation was conducted. Adults with outpatient diagnostic and surveillance colonoscopies were included. A total of 540 patients participated: group 'split-dose with bisacodyl' (n = 293) and group 'same-day' (n = 247). Patients in group 'split-dose with bisacodyl' had a higher chance for having an excellent quality of bowel preparation (21.2%; 95% CI [13.5, 28.9]) and a reduced risk of an incomplete colonoscopy (4.1%; 95% CI [1.2, 7.0]). Group 'split-dose with bisacodyl' drank more fluid, had more nightly visits to the bathroom, and had more bathroom stops on the way to the endoscopic site. No differences were found between groups regarding adenoma detection rate, withdrawal time, overall time of colonoscopy, well-being during cleansing, patient satisfaction, the professional's assessment of the patient's tolerability of colonoscopy, and willingness to repeat the bowel preparation process. The split-dose regimen with PicoPrep and bisacodyl is now the standard bowel preparation procedure for patients undergoing elective colonoscopy as it is superior to the same-day regimen with PicoPrep regarding colon cleansing and incomplete colonoscopy. Hence, the written and verbal information at our institution regarding the bowel preparation procedure was altered according to the split-dose regimen, emphasizing the importance of adequate oral fluid intake and complete intake of the solution in order to ensure a safe and effective procedure.

BowelScope: Accuracy of Detection Using Endocuff Optimisation of Mucosal Abnormalities (the B-ADENOMA Study): a multicentre, randomised controlled flexible sigmoidoscopy trial

OBJECTIVES

Adenoma detection rate (ADR) is an important quality marker at lower GI endoscopy. Higher ADRs are associated with lower postcolonoscopy colorectal cancer rates. The English flexible sigmoidoscopy (FS) screening programme (BowelScope), offers a one-off FS to individuals aged 55 years. However, variation in ADR exists. Large studies have demonstrated improved ADR using Endocuff Vision (EV) within colonoscopy screening, but there are no studies within FS. We sought to test the effect of EV on ADR in a national FS screening population.

DESIGN

BowelScope: Accuracy of Detection Using ENdocuff Optimisation of Mucosal Abnormalities was a multicentre, randomised controlled trial involving 16 English BowelScope screening centres. Individuals were randomised to Endocuff Vision-assisted BowelScope (EAB) or Standard BowelScope (SB). ADR, polyp detection rate (PDR), mean adenomas per procedure (MAP), polyp characteristics and location, participant experience, procedural time and adverse events were measured. Comparison of ADR within the trial with national BowelScope ADR was also undertaken.

RESULTS

3222 participants were randomised (53% male) to receive EAB (n=1610) or SB (n=1612). Baseline demographics were comparable between arms. ADR in the EAB arm was 13.3% and that in the SB arm was 12.2% (p=0.353). No statistically significant differences were found in PDR, MAP, polyp characteristics or location, participant experience, complications or procedural characteristics. ADR in the SB control arm was 3.1% higher than the national ADR.

CONCLUSION

EV did not improve BowelScope ADR when compared with SB. ADR in both arms was higher than the national ADR. Where detection rates are already high, EV is unable to improve detection further.

TRIAL REGISTRATION NUMBERS

NCT03072472, ISRCTN30005319 and CPMS ID 33224.

The National Endoscopy Database (NED) Automated Performance Reports to Improve Quality Outcomes Trial (APRIQOT) randomized controlled trial design

Background and study aims  Colonoscopists with low polyp detection have higher post colonoscopy colorectal cancer incidence and mortality rates. The United Kingdom's National Endoscopy Database (NED) automatically captures patient level data in real time and provides endoscopy key performance indicators (KPI) at a national, endoscopy center, and individual level. Using an electronic behavior change intervention, the primary objective of this study is to assess if automated feedback of endoscopist and endoscopy center-level optimal procedure-adjusted detection KPI (opadKPI) improves polyp detection performance. Methods  This multicenter, prospective, cluster-randomized controlled trial is randomizing NHS endoscopy centres to either intervention or control. The intervention is targeted at independent colonoscopists and each center's endoscopy lead. The intervention reports are evidence-based from endoscopist qualitative interviews and informed by psychological theories of behavior. NED automatically creates monthly reports providing an opadKPI, using mean number of polyps, and an action plan. The primary outcome is opadKPI comparing endoscopists in intervention and control centers at 9 months. Secondary outcomes include other KPI and proximal detection measures at 9 and 12 months. A nested histological validation study will correlate opadKPI to adenoma detection rate at the center level. A cost-effectiveness and budget impact analysis will be undertaken. Conclusion  If the intervention is efficacious and cost-effective, we will showcase the potential of this learning health system, which can be implemented at local and national levels to improve colonoscopy quality, and demonstrate that an automated system that collects, analyses, and disseminates real-time clinical data can deliver evidence- and theory-informed feedback.

Associations between endoscopist feedback and improvements in colonoscopy quality indicators: a systematic review and meta-analysis

BACKGROUND AND AIMS

Colonoscopy quality indicators such as adenoma detection rate (ADR) are surrogates for the effectiveness of screening-related colonoscopy. It is unclear whether endoscopist feedback on these indicators improves performance. We performed a meta-analysis to determine whether associations exist between endoscopist feedback and colonoscopy performance.

METHODS

We conducted a search through May 2019 for studies reporting on endoscopist feedback and associations with ADR or other colonoscopy quality indicators. Pooled rate ratios (RRs) and weighted mean differences were calculated using DerSimonian and Laird random effects models. Subgroup, sensitivity, and meta-regression analyses were performed to assess for potential methodological or clinical factors associated with outcomes.

RESULTS

From 1326 initial studies, 12 studies were included in the meta-analysis for ADR, representing 33,184 colonoscopies. Endoscopist feedback was associated with an improvement in ADR (RR, 1.21; 95% confidence interval [CI], 1.09-1.34). Low performers derived a greater benefit from feedback (RR, 1.62; 95% CI, 1.18-2.23) compared with moderate performers (RR, 1.19; 95% CI, 1.11-1.29), whereas high performers did not derive a significant benefit (RR, 1.06; 95% CI, 0.99-1.13). Feedback was not associated with increases in withdrawal time (weighted mean difference, +0.43 minutes; 95% CI, -0.50 to +1.36 minutes) or improvements in cecal intubation rate (RR, 1.00; 95% CI, 0.99-1.01).

CONCLUSION

Endoscopist feedback is associated with modest improvements in ADR. The implementation of routine endoscopist audit and feedback should be considered alongside other quality improvement interventions in institutions dedicated to the provision of high-quality screening-related colonoscopy.

Retroflexion, a costless endoscopic maneuver, increases adenoma detection rate in the ascending colon

Background

Missed polyps during colonoscopy are considered an important factor for interval cancer appearance, especially in the ascending colon (AC). We evaluated the contribution of retroflexion to polyp and adenoma detection in the AC.

Methods

This prospective observational study included consecutive patients who underwent a complete colonoscopy between 06/2017 and 06/2018. The AC was examined in 2 phases: the first included 2 forward views from the hepatic flexure to the cecum; the second involved a retroflexion in the cecum, inspection up to the hepatic flexure and reinsertion to the cecum.

Results

The study included 655 patients, 628 (95.88%) with successful retroflexion (mean age: 62.5±10.8 years, 332 male). Indications for colonoscopy were screening in 33.28%, follow up in 36.03%, and diagnostic assessment in 30.69%. In total, 286 polyps and 220 adenomas were detected in the AC. Phase 1 identified 119 adenomas, yielding an adenoma detection rate (ADR) in the AC of 14.2% (95% confidence interval [CI] 11.52-16.84%) while phase 2 identified 86 additional adenomas, improving the ADR in the AC to 22.75% (95%CI 19.54-25.96%; P<0.01). Adenoma miss rate was 39.1% (86/225) and per-patient adenoma miss rate was 11.15% (73/655). Retroflexion proved beneficial mainly in the upper third of the AC (odds ratio [OR] 4.29, 95%CI 1.84-11.56; P<0.01) and for small (<5 mm) adenomas (OR 1.61, 95%CI 1.02-2.56; P=0.04). Multivariate analysis showed that age >60 years, detection of adenomas in forward views and the indication “follow up” influenced ADR during retroflexion.

Conclusion

Retroflexion is a simple and safe maneuver that increases the ADR in the AC and should complete a second forward view.

Educational interventions are associated with improvements in colonoscopy quality indicators: a systematic review and meta-analysis

Background and study aims  The quality of screening-related colonoscopy depends on several physician- and patient-related factors. Adenoma detection rate (ADR) varies considerably between endoscopists. Educational interventions aim to improve endoscopists' ADRs, but their overall impact is uncertain. We aimed to assess whether there is an association between educational interventions and colonoscopy quality indicators. Methods  A comprehensive search was performed through August 2019 for studies reporting any associations between educational interventions and any colonoscopy quality indicators. Our primary outcome of interest was ADR. Two authors assessed eligibility criteria and extracted data independently. Risk of bias was also assessed for included studies. Pooled rate ratios (RR) with 95 % confidence intervals (CI) were reported using DerSimonian and Laird random effects models. Results  From 2,253 initial studies, eight were included in the meta-analysis for ADR, representing 86,008 colonoscopies. Educational interventions were associated with improvements in overall ADR (RR 1.29, 95 % CI 1.25 to 1.42, 95 % prediction interval 1.09 to 1.53) and proximal ADR (RR 1.39, 95 % CI 1.29 to 1.48), with borderline increases in withdrawal time, ([WT], mean difference 0.29 minutes, 95 % CI - 0.12 to 0.70 minutes). Educational interventions did not affect cecal intubation rate ([CIR], RR 1.01, 95 % CI 1.00 to 1.01). Heterogeneity was considerable across many of the analyses. Conclusions  Educational interventions are associated with significant improvements in ADR, in particular, proximal ADR, and are not associated with improvements in WT or CIR. Educational interventions should be considered an important option in quality improvement programs aiming to optimize the performance of screening-related colonoscopy.

Balloon-Assisted Colonoscopy after Incomplete Conventional Colonoscopy-Experience from Two European Centres with A Comprehensive Review of the Literature

Background: Conventional colonoscopy (CC) allows access for colonic investigation and intervention; in the small group in whom CC is unsuccessful alternative imaging is often sufficient. There remains a subset, however, requiring full colonic visualisation or intervention. Balloon-assisted colonoscopy (BAC) gives a further option when access is difficult. Aims: This study aims to present the experience with BAC of two European tertiary referral centres. Methods: Procedures were carried out under local protocol over 15-years (2006–2020). Markers of procedural quality such as caecal intubation, complications and comfort were retrospectively compiled and analysed. Published evidence was summarised for comparison. Results: 122 procedures were undertaken, with polyps the most frequent indication and 90.2% having at least one previously incomplete CC. Features associated with difficult colonoscopy were common, including intraabdominal surgery (32.0%). 92.6% reached the caecum; completion was higher (96.3%) in those failing CC due to discomfort and lower in those failing due to anatomical difficulties (90.7%) or previous surgery (84.6%). Mean time to the caecum was 20.9 minutes and mean midazolam and fentanyl doses were 2.6 mg and 49.9 µg with low discomfort scores. Conclusion(s): Balloon-assisted colonoscopy is successful in >90% of patients, is well-tolerated, and is safe.

Are adenoma and serrated polyp detection rates correlated with endoscopists' sensitivity of optical diagnosis?

INTRODUCTION : Endoscopists with a high adenoma detection rate (ADR) and proximal serrated polyp detection rate (PSPDR) detect these polyps more frequently, which may be attributable to better recognition of their endoscopic features. Little is known about the association between endoscopic lesion detection and differentiation skills. Therefore, we evaluated the correlation between the ADR, PSPDR, and the sensitivity of optical diagnosis for adenomas and serrated polyps.

METHODS

We performed an exploratory post-hoc analysis of the DISCOUNT-2 study, including complete colonoscopies after a positive fecal immunochemical test (FIT) performed by endoscopists who performed ≥ 50 colonoscopies. The correlations between the ADR, PSPDR, and the sensitivity of optical diagnosis were calculated using Pearson's rho correlation coefficient.

RESULTS

24 endoscopists performed ≥ 50 colonoscopies, resulting in a total of 2889 colonoscopies. The overall ADR was 84.5 % (range 71.4 % - 95.3 %) and overall PSPDR was 13.7 % (4.3 % - 29.0 %). The sensitivity of optical diagnosis for adenomas and serrated polyps were 94.5 % (83.3 % - 100 %) and 74.0 % (37.5 % - 94.1 %), respectively. No correlation could be demonstrated between the ADR and the sensitivity of optical diagnosis for adenomas (-0.20; P = 0.35) or between the PSPDR and the sensitivity of optical diagnosis for serrated polyps (-0.12; P = 0.57).

CONCLUSIONS

In a homogeneous FIT-positive population, no correlation between the ADR, PSPDR, and the sensitivity of optical diagnosis for adenomas and serrated polyps could be demonstrated. These exploratory results suggest that lesion detection and differentiation require different endoscopic skills. Further prospective studies are needed; until then, monitoring of both performance indicators is important to secure optimal efficacy of FIT-based colorectal cancer screening.

Association Between Endoscopist Annual Procedure Volume and Colonoscopy Quality: Systematic Review and Meta-analysis

BACKGROUND & AIMS

In addition to monitoring adverse events (AEs) and post-colonoscopy colorectal cancers (PCCRC), indicators for assessing colonoscopy quality include adenoma detection rate (ADR) and cecal intubation rate (CIR). It is unclear whether there is an association between annual colonoscopy volume and ADR, CIR, AEs, or PCCRC.

METHODS

We searched publication databases through March 2019 for studies assessing the relationship between annual colonoscopy volume and outcomes, including ADR, CIR, AEs, or PCCRC. Pooled odds ratios (ORs) were calculated using DerSimonian and Laird random effects models. Sensitivity analyses were performed to assess for potential methodological or clinical factors associated with outcomes.

RESULTS

We performed a systematic review of 9235 initial citations, generating 27 retained studies comprising 11,276,244 colonoscopies. There was no association between procedural volume and ADR (OR, 1.00; 95% CI, 0.98-1.02 per additional 100 annual procedures). CIR improved with each additional 100 annual procedures (OR, 1.17; 95% CI, 1.08-1.28). There was a non-significant trend toward decreased overall AEs per additional 100 annual procedures (OR, 0.95; 95% CI, 0.90-1.00). There was considerable heterogeneity among most analyses.

CONCLUSIONS

In a systematic review and meta-analysis, we found higher annual colonoscopy volumes to correlate with higher CIR, but not with ADR or PCCRC. Trends toward fewer AEs were associated with higher annual colonoscopy volumes. There are few data available from endoscopists who perform fewer than 100 annual colonoscopies. Studies are needed on extremes in performance volumes to more clearly elucidate associations between colonoscopy volumes and outcomes.

Multitarget stool DNA testing for the prevention of colon cancer: outcomes in a large integrated healthcare system

BACKGROUND AND AIMS

Multitarget stool DNA (MT-sDNA) testing is used in primary care as a screening test for colon cancer. Test effectiveness and patient compliance were examined in clinical practice.

METHODS

We assessed outcomes of MT-sDNA testing in a cohort study conducted in a large integrated healthcare system comprising 15 hospitals and 150 outpatient clinics using advanced electronic data capture (Clarity2 [Epic, Verona, Wisc, USA] and REDCap [Encinitas, Calif, USA]) followed by manual chart review to confirm MT-sDNA test results and to monitor the outcomes of subsequent colonoscopy.

RESULTS

A total of 6835 MT-sDNA tests were performed over 1 year between 2017 and 2018. Of 1242 patients (18%) who tested positive, 1109 (89%) were referred for colonoscopy, and 905 of them (73%) underwent colonoscopy. Eleven patients (<1%) with a positive test had colorectal cancer, 215 (17%) had advanced adenomas, 110 (9%) had serrated adenomas, and 546 (60%) patients had an adenoma. Of the 6835 patients tested, adenoma or cancer was found in 557 patients (8%). An advanced adenoma or cancer was found in 226 of 1242 patients with a positive test (18%). Nonadherence with colonoscopy after a positive test was high (21%), and the cost to detect 1 advanced adenoma or cancer was $38,849.

CONCLUSIONS

The frequency of adenoma detection by an MT-sDNA screening strategy is low, and many positive tests are not associated with significant findings at colonoscopy. Failure to follow a positive test with colonoscopy is a significant problem that needs to be considered when this screening strategy is adopted.

Colonoscopy adverse events: are we getting the full picture?

INTRODUCTION

Colonoscopy adverse events (AEs) are commonly underreported and standardised reporting is rarely used. We aimed to investigate AEs associated with colonoscopy in a real world setting, using the American Society of Gastrointestinal Endoscopy (ASGE) lexicon.

METHODS

This retrospective cohort study of AEs related to outpatient colonoscopies performed in the North Denmark Region from 2015 to 2018 identified AEs from readmission within eight days or death within 30 days of colonoscopy. AEs were investigated in electronic health records and categorised, attributed and graded according to the ASGE lexicon.

RESULTS

Of 49,445 colonoscopies performed, 1141 were potentially associated with AEs (23.07‰). Electronic health record review left 489 AEs attributed to colonoscopy (9.9‰); categorised as cardiovascular (0.65‰), pulmonary (0.36‰), thromboembolic (0.10‰), instrumental incl. perforations (0.99‰), bleeding (3.07‰), infection (0.87‰), drug reactions (0.04‰), pain (2.00‰), integument (damage to skin/bones) (0.34‰) and other (1.62‰) AEs. Ten (0.20‰) AEs were fatal, but only one was procedure related (perforation). All shearing force perforations occurred in the sigmoid colon. Most polypectomy perforations occurred in the caecum (60%).

CONCLUSIONS

Colonoscopy carries important procedure and non-procedure related risks. Non-procedure related AEs are likely underreported. Better attention to patients with pre-existing diseases and further colonoscopist training may lower AE rates. A standardised colonoscopy AE reporting system is warranted.

Optimising bowel preparation before colonoscopy

A clean colon is required for a colonoscopy to be effective. Therefore, patients undergo a bowel preparation in advance of the procedure to clear the colon. Typically, this involves drinking 2 litres of polyethylene glycol or macrogol (PEG) solution, but dislike of the taste or having to drink such a large volume causes some patients not to adhere to this regimen. To address this, a PEG solution has been developed that requires patients to drink only 1 litre of bowel preparation in two flavours. The hope is this will increase patient adherence.

Impact of a national basic skills in colonoscopy course on trainee performance: An interrupted time series analysis

BACKGROUND

The Joint Advisory Group on Gastrointestinal Endoscopy basic skills in colonoscopy (BSC) course was introduced in 2009 to improve colonoscopy training within the United Kingdom, but its impact on trainee performance is unknown.

AIM

To assess whether attendance of the BSC could improve colonoscopy performance.

METHODS

Trainees awarded colonoscopy certification between 2011-2016 were stratified into 3 groups according to pre-course procedure count (< 70, 70-140 and > 140). Study outcomes, comprising the unassisted caecal intubation rate (CIR) and the performance indicator of colonic intubation (PICI), were studied over the 50 procedures pre and post- course. Interrupted time series analyses were performed to detect step-change changes attributable to the course.

RESULTS

A total of 369 trainees with pre-course procedure counts of < 70 (n = 118), 70-140 (n = 121) and > 140 (n = 130) were included. Over the 50 pre-course procedures, significant linear improvements in CIR were found, with average increases of 4.2, 3.6 and 1.7 percentage points (pp) per 10 procedures performed in the < 70, 70-140 and > 140 groups respectively (all P < 0.001). The < 70 procedures group saw a significant step-change improvement in CIR, increasing from 46% in the last pre-course procedure, to 51% in the first procedure post-course (P = 0.005). The CIR step-change was not significant in the 70-140 (68% to 71%; P = 0.239) or > 140 (86% to 87%; P = 0.354) groups. For PICI, significant step-change improvements were seen in all three groups, with average increases of 5.6 pp (P < 0.001), 5.4 pp (P = 0.003) and 3.9 pp (P = 0.014) respectively.

CONCLUSION

Attendance of the BSC was associated with a significant step-change improvement in PICI, regardless of prior procedural experience. However, CIR data suggest that the optimal timing of course attendance appears to be at earlier stages of training (< 70 procedures).

Colon capsule endoscopy: an innovative method for detecting colorectal pathology during the COVID-19 pandemic?

AIM

The coronavirus pandemic has led to significant challenges for healthcare delivery across the globe. Non-emergency endoscopic activity in the UK has been postponed, raising concerns of increased delays in the diagnosis of colorectal cancer and a surge in demand once services resume. Measures to mitigate this risk must be considered.

METHOD

This paper reviews various investigative modalities for colorectal disease which could be deployed during cessation of colonoscopy services. We focus on colon capsule endoscopy (CCE) due to its relevance during the COVID-19 pandemic and its ability to triage patients effectively to further endoscopic investigations.

RESULTS

CT of the abdomen and pelvis has been suggested as a triage tool while access to colonoscopy is limited. However, CT may lead to the spread of COVID-19 as patients attend the hospital, and it exposes them to the risks of radiation. Faecal immunochemistry tests have been demonstrated as a good predictor of colonic pathology and could be safely used to risk stratify patients when prioritizing colonoscopy. CCE is a safe and innovative technology for investigating the colon. Procedures can be carried out in the community and can be conducted safely during the coronavirus pandemic. It has been shown to be an accurate detector of colonic neoplasia and can reduce demand for colonoscopy.

CONCLUSION

As colonoscopy services resume, they will probably experience high demand leading to further delays for patients. CCE could be used to reduce the number of patients requiring colonoscopy and triage those requiring further endoscopic investigations appropriately.

Anastomotic dehiscence following retroflexion in surveillance colonoscopy: a case report

Anastomotic dehiscence following colonoscopy for routine surveillance after anterior resection for colorectal cancer is unreported in the English literature. It is a potentially fatal complication requiring awareness, quick recognition and management. We present the case of a 45-year-old woman who presented 12 hours after a routine follow-up colonoscopy with peritonitis due to anastomotic rupture diagnosed on computed tomography. The patient was taken to theatre for emergency laparotomy and formation of an end colostomy. Her postoperative recovery and follow-up were optimal.

Prevalence of harmful diagnostic errors in hospitalised adults: a systematic review and meta-analysis

Background

Diagnostic error is commonly defined as a missed, delayed or wrong diagnosis and has been described as among the most important patient safety hazards. Diagnostic errors also account for the largest category of medical malpractice high severity claims and total payouts. Despite a large literature on the incidence of inpatient adverse events, no systematic review has attempted to estimate the prevalence and nature of harmful diagnostic errors in hospitalised patients.

Methods

A systematic literature search was conducted using Medline, Embase, Web of Science and the Cochrane library from database inception through 9 July 2019. We included all studies of hospitalised adult patients that used physician review of case series of admissions and reported the frequency of diagnostic adverse events. Two reviewers independently screened studies for inclusion, extracted study characteristics and assessed risk of bias. Harmful diagnostic error rates were pooled using random-effects meta-analysis.

Results

Twenty-two studies including 80 026 patients and 760 harmful diagnostic errors from consecutive or randomly selected cohorts were pooled. The pooled rate was 0.7% (95% CI 0.5% to 1.1%). Of the 136 diagnostic errors that were described in detail, a wide range of diseases were missed, the most common being malignancy (n=15, 11%) and pulmonary embolism (n=13, 9.6%). In the USA, these estimates correspond to approximately 249 900 harmful diagnostic errors yearly.

Conclusion

Based on physician review, at least 0.7% of adult admissions involve a harmful diagnostic error. A wide range of diseases are missed, including many common diseases. Fourteen diagnoses account for more than half of all diagnostic errors. The finding that a wide range of common diagnoses are missed implies that efforts to improve diagnosis must target the basic processes of diagnosis, including both cognitive and system-related factors.

PROSPERO registration number

CRD42018115186.