Survival of elderly persons undergoing colonoscopy: implications for colorectal cancer screening and surveillance

Surveillance colonoscopy findings in asymptomatic participants over 75 years of age

Background and Aim

Surveillance colonoscopy for colorectal cancer (CRC) is generally not recommended beyond 75 years of age. The study determined incidence and predictors of advanced adenoma and CRC in older individuals undergoing surveillance colonoscopy.

Methods

This was a retrospective cohort study of asymptomatic older participants (≥75 years), enrolled in a South Australian CRC surveillance program who underwent colonoscopy (2015-2020). Clinical records were extracted for demographics, personal or family history of CRC, comorbidities, polypharmacy, and colonoscopy findings. The associations between clinical variables and advanced adenoma or CRC at surveillance were assessed with multivariable Poisson regression analysis.

Results

Totally 698 surveillance colonoscopies were analyzed from 574 participants aged 75-91 years (55.6% male). The incidence of CRC was 1.6% (11/698), while 37.9% (260/698) of procedures had advanced adenoma detected. Previous CRC (incidence rate ratio [IRR] 5.9, 95% CI 1.5-22.5), age ≥85 years (IRR 5.8, 95% CI 1.6-20.1) and active smoking (IRR 4.9, 95% CI 1.0-24.4) were independently associated with CRC diagnosis, while advanced adenoma at immediately preceding colonoscopy (IRR 1.6, 95% CI 1.3-2.0) and polypharmacy (IRR 1.2, 95% CI 1.0-1.5) were associated with advanced adenoma at surveillance colonoscopy in asymptomatic older participants (≥75 years).

Conclusion

Advanced neoplasia was found in more than one third of the surveillance procedures completed in this cohort. Continuation of surveillance beyond age 75 yeasrs may be considered in participants who have previous CRC or are active smokers (provided they are fit to undergo colonoscopy). In other cases, such as past advanced adenoma only, the need for ongoing surveillance should be considered alongside participant preference and health status.

A retrospective study of colonoscopic surveillance in the elderly

BACKGROUND

Aotearoa New Zealand (AoNZ) guidelines suggest surveillance colonoscopy should be carefully considered after age 75. The authors noted a cluster of patients presenting in their 8th and 9th decade of life with a new colorectal cancer (CRC) having previously been declined surveillance colonoscopy.

METHODS

A 7-year retrospective analysis was performed of patients who underwent a colonoscopy aged between 71 and 75 years in the period between 2006 and 2012. Kaplan-Meier graphs were created with survival measured from the time of index colonoscopy. Log rank tests were used to determine any difference in survival distribution. Relative risk (RR) was calculated, and 95% confidence intervals (CI) reported.

RESULTS

A total of 623 patients met inclusion criteria; 461 (74%) had no indication for surveillance colonoscopy and 162 (26%) had an indication. Of the 162 patients with an indication, 91 (56.2%) underwent surveillance colonoscopies after the age of 75. Twenty-three (3.7%) patients were diagnosed with a new CRC. Eighteen (78.2%) patients diagnosed with a new CRC underwent surgery. The median survival overall was 12.9 years (95% CI 12.2-13.5). This did not differ between patients with (13.1, 95% CI 12.1-14.1) or without (12.6, 95% CI 11.2-14.0) an indication for surveillance.

CONCLUSION

This study found one quarter of patients who had a colonoscopy between the ages of 71-75 had an indication for surveillance colonoscopy. Most patients with a new CRC underwent surgery. This study suggests it may be appropriate to update the AoNZ guidelines and consider adopting a risk stratification tool to aid decision making.

Improved Survival in a Cohort of Patients Aged 75 Years and Older With Fecal Immunochemical Testing-Detected Colorectal Cancer

BACKGROUND

Fecal immunochemical testing is an accepted form of colorectal cancer screening and is recommended for adults up to the age of 75 years in Canadian guidelines. However, many individuals 75 years and older continue to receive fecal immunochemical testing despite being outside accepted guidelines.

OBJECTIVE

This study aimed to determine whether patients aged 75 years and older with screen-detected cancer demonstrated improved outcomes and survival compared with patients with non-screen-detected cancer.

DESIGN

This is a retrospective population-based cohort study.

SETTINGS

Provincial data were collected from the Alberta Cancer Registry and the Alberta Colorectal Cancer Screening Program between November 2013 and 2019.

PATIENTS

We identified an aggregated patient cohort aged 75 years and older with a diagnosis of colorectal cancer from November 2013 to November 2019, as well as patients 75 years and older who underwent fecal immunochemical testing within these dates.

MAIN OUTCOME MEASURES

The proportion of screen-detected colorectal cancers was calculated. Surgical intervention, hospital length of stay, postoperative mortality, and overall survival were analyzed.

RESULTS

Between November 2013 and 2019, 3586 patients 75 years and older were diagnosed with colorectal cancer; 690 (19%) were "screen-detected." Screen-detected patients were almost 3 times more likely to undergo surgery (OR, 2.83) and had a 36% overall survival benefit (HR, 0.64) compared with non-screen-detected patients, adjusted for other variables such as age, Charlson Comorbidity Index, and stage.

LIMITATIONS

The retrospective study design prevents conclusions regarding causation.

CONCLUSIONS

Screen detection of colorectal cancer in patients aged 75 years and older is associated with improved overall survival when controlling for other potential confounders. When compared with their non-screen-detected counterparts, these patients have an earlier stage of disease and are more likely to undergo surgical intervention with improved outcomes, irrespective of age. These data may support screening for appropriately selected patients who would otherwise fall outside of current guidelines. See Video Abstract at http://links.lww.com/DCR/B986 .

SOBREVIDA MEJORADA EN UNA COHORTE DE PACIENTES DE AOS O MS CON CNCER COLORRECTAL DETECTADOS POR RIF

ANTECEDENTES:La prueba basada en una Reacción Inmunoquímica Fecal - RIF, es una forma aceptada de detección de cáncer colorrectal y esta recomendada en adultos a partir de los 75 años en las guías canadienses. Sin embargo, muchas personas de 75 años o más continúan realizándose pruebas inmunoquímicas fecales a pesar de estar fuera de las guías aceptadas.OBJETIVO:Poder determinar si los pacientes de 75 años o más con detección RIF positiva a un cáncer demuestran mejores resultados y sobrevida comparados con los pacientes sin detección.DISEÑO:Estudio de cohortes retrospectivo basado en una población definida.CONFIGURACIÓN:Se recopilaron los datos provinciales del Registro de cánceres y del Programa de detección de cáncer colorrectal de Alberta, Canada, entre 2013 y 2019.PACIENTES:Identificamos una cohorte agregada de pacientes de 75 años o más con diagnóstico de cáncer colorrectal desde noviembre de 2013 hasta noviembre de 2019, así como pacientes de 75 años o más que se sometieron a pruebas inmunoquímicas fecales dentro de las fechas mencionadas.PRINCIPALES MEDIDAS DE RESULTADO:Se calculó la proporción de cánceres colorrectales detectados mediante un cribado. Se analizaron la intervención quirúrgica, la duración de la estadía hospitalaria, la mortalidad post-operatoria y la sobrevida global.RESULTADOS:Entre noviembre de 2013 y noviembre 2019, 3586 pacientes de 75 años o más, fueron diagnosticados con cáncer colorrectal; 690 (19%) fueron detectados por cribado. Los pacientes detectados mediante el cribado, tenían casi tres veces más probabilidades de someterse a una cirugía (Razón de Probabilidad de 2,83) y beneficiaron de una sobrevida general del 36 % (HR 0,64) comparados con los pacientes sin detectación por cribado, corregidos por otras variables como la edad, el índice de comorbilidad de Charlson y el estadío del tumor.LIMITACIONES:El diseño retrospective del presente estudio impide obtener conclusiones con respecto a la causalidad.CONCLUSIONES:La detección por cribado de cáncer colorrectal en pacientes de 75 años o más se asocia con una mejor sobrevida general cuando se controlan los otros posibles factores de confusión. Comparando con las contrapartes no detectadas por cribado, estos pacientes se encuentran en una etapa más temprana de la enfermedad y es más probable que se sometan a una intervención quirúrgica con mejores resultados, independientemente a la edad. Estos datos pueden respaldar la detección de pacientes adecuadamente seleccionados que, de otro modo, quedarían fuera de las pautas actuales. Consulte Video Resumen en http://links.lww.com/DCR/B986 . (Traducción-Dr. Xavier Delgadillo ).

Effect of a Patient Decision Aid on Preferences for Colorectal Cancer Screening Among Older Adults: A Secondary Analysis of a Randomized Clinical Trial

IMPORTANCE

Guidelines recommend individualized decision-making for colorectal cancer (CRC) screening among adults aged 76 to 84 years, a process that includes a consideration of health state and patient preference.

OBJECTIVE

To determine whether a targeted patient decision aid would align older adults' screening preference with their potential to benefit from CRC screening.

DESIGN, SETTING, AND PARTICIPANTS

This is a prespecified secondary analysis from a randomized clinical trial. Participants aged 70 to 84 years who were not up to date with screening and had an appointment within 6 weeks were purposively sampled by health state (poor, intermediate, or good) at 14 community-based primary care practices and block randomized to receive the intervention or control. Patients were recruited from March 1, 2012, to February 28, 2015, and these secondary analyses were performed from January 15 to March 1, 2022.

INTERVENTIONS

Patient decision aid targeted to age and sex.

MAIN OUTCOMES AND MEASURES

The primary outcome of this analysis was patient preference for CRC screening. The a priori hypothesis was that the decision aid (intervention) group would reduce the proportion preferring screening among those in poor and intermediate health compared with the control group.

RESULTS

Among the 424 participants, the mean (SD) age was 76.8 (4.2) years; 248 (58.5%) of participants were women; and 333 (78.5%) were White. The proportion preferring screening in the intervention group was less than in the control group for those in the intermediate health state (34 of 76 [44.7%] vs 40 of 73 [54.8%]; absolute difference, -10.1% [95% CI, -26.0% to 5.9%]) and in the poor health state (24 of 62 [38.7%] vs 33 of 61 [54.1%]; absolute difference, -15.4% [95% CI, -32.8% to 2.0%]). These differences were not statistically significant. The proportion of those in good health who preferred screening was similar between the intervention and control groups (44 of 74 [59.5%] for intervention vs 46 of 75 [61.3%] for control; absolute difference, -1.9% [95% CI, -17.6% to 13.8%]).

CONCLUSIONS AND RELEVANCE

The findings of this secondary analysis of a clinical trial did not demonstrate statistically significant differences in patient preferences between the health groups. Additional studies that are appropriately powered are needed to determine the effect of the decision aid on the preferences of older patients for CRC screening by health state.

TRIAL REGISTRATION

ClinicalTrials.gov Identifier: NCT01575990.

Screening Colonoscopy Findings Are Associated With Noncolorectal Cancer Mortality

INTRODUCTION

Controversy exists regarding the impact of various risk factors on noncolorectal cancer (CRC) mortality in healthy screening populations. We examined the impact of known CRC risk factors, including baseline colonoscopy findings, on non-CRC mortality in a screening population.

METHODS

Cooperative Studies Program (CSP) #380 is comprised of 3,121 veterans aged 50-75 years who underwent screening colonoscopy from 1994 to 97 and were then followed for at least 10 years or until death. Hazard ratios (HRs) for risk factors on non-CRC mortality were estimated by multivariate Cox proportional hazards.

RESULTS

Current smoking (HR 2.12, 95% confidence interval [CI] 1.78-2.52, compared with nonsmokers) and physical activity (HR 0.89, 95% CI 0.84-0.93) were the modifiable factors most associated with non-CRC mortality in CSP#380. In addition, compared with no neoplasia at baseline colonoscopy, non-CRC mortality was higher in participants with ≥3 small adenomas (HR 1.43, 95% CI 1.06-1.94), advanced adenomas (HR 1.32, 95% CI 0.99-1.75), and CRC (HR 2.95, 95% CI 0.98-8.85). Those with 1-2 small adenomas were not at increased risk for non-CRC mortality (HR 1.15, 95% CI 0.94-1.4).

DISCUSSION

In a CRC screening population, known modifiable risk factors were significantly associated with 10-year non-CRC mortality. Furthermore, those who died from non-CRC causes within 10 years were more likely to have had high-risk findings at baseline colonoscopy. These results suggest that advanced colonoscopy findings may be a risk marker of poor health outcomes. Integrated efforts are needed to motivate healthy lifestyle changes during CRC screening, particularly in those with high-risk colonoscopy findings and unaddressed risk factors.

Risk Factors Associated with Colorectal Cancer in Octogenarians Can Help Stratify the Need for Colonoscopy

Objective Colonoscopy is increasingly performed in octogenarians for the detection of colorectal cancer (CRC), but its benefits may be outweighed by its risks. The aim of the present study was to identify the risk factors for CRC in octogenarians presenting for colonoscopy to help stratify the need for this procedure.

Methods A retrospective analysis of 434 patients aged ≥ 80 years referred for a colonoscopy between January 2018 and December 2019. Comparisons were made between those with and without CRC and advanced adenoma (AA). The primary endpoint was to identify the clinical variables predictive of CRC and AA, and the secondary endpoints were complications and death 30 days after the procedure.

Results Colonoscopy was performed in 434 octogenarians, predominantly for symptoms, with CRC in 65 (15.0%) patients. Iron deficiency was associated with a higher risk of having CRC identified on colonoscopy (odds ratio [OR]: 2.33; 95% confidence interval [95%CI] =  1.36–4.00), but not symptoms such as bleeding, weight loss, or diarrhea. A colonoscopy in the last 10 years was protective, with a lower risk of CRC (OR: 0.45; 95%CI = 0.22–0.93). Patients with both normal iron stores and a colonoscopy within 10 years had a 92.5% chance of not having CRC. No variables were predictive of AA. Patients with complications, including death, were older and more likely to have underlying cardiorespiratory disease.

Conclusion Iron status and colonoscopy within 10 years can be used to predict the risk of CRC in octogenarians. Those with low predicted risk, especially if older and with cardiorespiratory disease, should be considered for non-invasive tests, such as computed tomography (CT) colonography, over colonoscopy.

Association of Screening Lower Endoscopy With Colorectal Cancer Incidence and Mortality in Adults Older Than 75 Years

Importance

Evidence indicates that screening for colorectal cancer (CRC) beginning at 50 years of age can detect early-stage CRC and premalignant neoplasms (eg, adenomas) and thus prevent CRC-related mortality. At present, the US Preventive Services Task Force recommends continuing CRC screening until 75 years of age and individualized decision-making for adults older than 75 years, while accounting for a patient's overall health and screening history. However, scant data exist to support these recommendations.

Objective

To examine the association of lower gastrointestinal tract screening endoscopy with the risk of CRC incidence and CRC-related mortality in older US adults.

Design, Setting, and Participants

This prospective cohort study of health care professionals in the US included data from the Nurses' Health Study (NHS) and Health Professionals Follow-up Study (HPFS) from January 1, 1988, through January 31, 2016, for the HPFS and June 30, 2016, for the NHS. Data were analyzed from May 8, 2019, to July 9, 2020.

Exposures

History of screening sigmoidoscopy or colonoscopy (routine/average risk or positive family history) to 75 years of age and after 75 years of age, assessed every 2 years.

Main Outcomes and Measures

Incidence of CRC and CRC-related mortality confirmed by National Death Index, medical records, and pathology reports.

Results

Among 56 374 participants who reached 75 years of age during follow-up (36.8% men and 63.2% women), 661 incident CRC cases and 323 CRC-related deaths were documented. Screening endoscopy after 75 years of age was associated with reduced risk of CRC incidence (multivariable hazard ratio [HR], 0.61; 95% CI, 0.51-0.74) and CRC-related mortality (HR, 0.60; 95% CI, 0.46-0.78), regardless of screening history. The HR comparing screening with nonscreening after 75 years of age was 0.67 (95% CI, 0.50-0.89) for CRC incidence and 0.58 (95% CI, 0.38-0.87) for CRC-related mortality among participants who underwent screening endoscopy before 75 years of age, and 0.51 (95% CI, 0.37-0.70) for CRC incidence and 0.63 (95% CI, 0.43-0.93) for CRC-related mortality among participants without a screening history. However, screening endoscopy after 75 years of age was not associated with risk reduction in CRC death among participants with cardiovascular disease (HR, 1.18; 95% CI, 0.59-2.35) or significant comorbidities (HR, 1.17; 95% CI, 0.57-2.43).

Conclusions and Relevance

In this cohort study, endoscopy among individuals older than 75 years was associated with lower risk of CRC incidence and CRC-related mortality. These data support continuation of screening after 75 years of age among individuals without significant comorbidities.

Primary care clinicians' perceptions of colorectal cancer screening tests for older adults

Colonoscopy is an effective screening test for colorectal cancer but is associated with significant risks and burdens, especially in older adults. Stool tests, which are more convenient, more accessible, and less invasive, can be important tools to improve screening. How clinicians make decisions about colonoscopy versus stool tests in older patients is not well-understood. We conducted semi-structured interviews with primary care clinicians throughout Maryland in 2018-2019 to examine how clinicians considered the use of stool tests for colorectal cancer screening in their older patients. Thirty clinicians from 21 clinics participated. The mean clinician age was 48.2 years. The majority were physicians (24/30) and women (16/30). Four major themes were identified using qualitative content analysis: (1) Stool test equivalency - although many clinicians still considered colonoscopy as the test of choice, some clinicians considered stool tests equivalent options for screening. (2) Reasons for recommending stool tests - clinicians reported preferentially using stool tests in sicker/older patients or patients who declined colonoscopy. (3) Stool test overuse - some clinicians reported recommending stool tests for patients for whom guidelines do not recommend any screening. (4) Barriers to use - perceived barriers to using stool tests included lack of familiarity, un-returned stool test kits, concern for accuracy, and concern about cost. In summary, clinicians reported preferentially using stool tests in sicker and older patients and mentioned examples of potential overuse. Additional studies are needed on how to better individualize the use of different colorectal screening tests in older patients.

Risk of metachronous neoplasia on surveillance colonoscopy among young and older patients after polypectomy

BACKGROUND AND AIMS

Few reports address the appropriate colonoscopy surveillance interval for individuals <50-years-old. We compared the risk of metachronous neoplasia among young (<50 years), adult (50-74 years) and older (≥75 y) age groups.

METHODS

This was a single center retrospective cohort study. Eligible subjects underwent their first colonoscopy with polypectomy between 2005 and 2014 and had at least one surveillance colonoscopy 3-5 years later. Patients (N = 495) were stratified at baseline into low-risk adenoma (LRA) and advanced adenoma groups. Study outcomes were overall and high-risk neoplasia at surveillance colonoscopy.

RESULTS

In the baseline LRA-group (N = 201), the 5-year risk of metachronous high-risk neoplasia was 12.5%, 15.2% and 22.5% (P = 0.426) in the young, adult and older age groups, respectively. In the baseline advanced adenoma group (N = 294), the 3-year risk of metachronous high-risk neoplasia was 13.3%, 14.8% and 25.3% (P = 0.041), respectively. In multivariate analysis, the only risk factor for metachronous high-risk neoplasia was older age (OR 1.876, CI 1.087-3.238; P = 0.024).

CONCLUSIONS

Considering the comparable risk of metachronous high-risk neoplasia in young and adult patients, surveillance recommendations after polypectomy should not differ. Since this risk is higher among older people, more frequent surveillance schedule can be considered for this age group but should be individualized.

Patient Attitudes Toward Individualized Recommendations to Stop Low-Value Colorectal Cancer Screening

IMPORTANCE

Guidelines for colorectal cancer (CRC) screening recommend an individualized approach in older adults that is informed by consideration of life expectancy and cancer risk. However, little is known about how patients perceive individualized screening recommendations.

OBJECTIVE

To assess veterans' attitudes toward and comfort with cessation of low-value CRC screening (defined as screening in a patient for whom the benefit is expected to be small based on quantitative estimates from hypothetical risk calculators).

DESIGN, SETTING, AND PARTICIPANTS

This survey study included patients older than 50 years who had undergone prior screening colonoscopy with normal results at the Veterans Affairs Ann Arbor Healthcare System. A total of 1500 surveys were mailed to potential participants from November 1, 2010, to January 1, 2012. Survey data were analyzed from January 1, 2016, to December 31, 2017.

MAIN OUTCOMES AND MEASURES

Response to the question, "If you personally had serious health problems that were likely to shorten your life and your doctor did not think screening would be of much benefit based on the calculator, how comfortable would you be with not getting any more screening colonoscopies?"

RESULTS

Of the 1500 surveys mailed, 85 were returned to sender, leaving 1415 potential respondents; 1054 of these respondents (median age range, 60-69 years; 884 [85.9%] white and 965 [94.2%] male) completed the survey (response rate, 74.5%). A total of 300 (28.7%) were not at all comfortable with cessation of low-value CRC screening, and 509 (49.3%) thought that age should never be used to decide when to stop screening. In addition, 332 (31.7%) thought it was not at all reasonable to use life expectancy calculators, and 255 (24.3%) thought it was not at all reasonable to use CRC risk calculators to guide these decisions. In ordered logistic regression analysis, factors associated with more comfort with screening cessation were (1) higher trust in physician (odds ratio [OR], 1.19; 95% CI, 1.07-1.32), (2) higher perceived health status (OR, 1.41; 95% CI, 1.23-1.61), and (3) higher barriers to screening (OR, 1.20; 95% CI, 1.11-1.30). Factors that were associated with less comfort with screening cessation included (1) greater perceived effectiveness of screening (OR, 0.86; 95% CI, 0.80-0.94) and (2) greater perceived threat of CRC (OR, 0.81; 95% CI, 0.73-0.89).

CONCLUSIONS AND RELEVANCE

The findings suggest that many veterans have strong preferences against screening cessation even when given detailed information about why the benefit may be low. Efforts to tailor screening recommendations may be met by resistance unless they are accompanied by efforts to address underlying perceptions about the benefit of screening.

A Decision Aid to Promote Appropriate Colorectal Cancer Screening among Older Adults: A Randomized Controlled Trial

Background. Concerns have been raised about both over- and underutilization of colorectal cancer (CRC) screening in older patients and the need to align screening behavior with likelihood of net benefit. Objective. The purpose of this study was to test a novel use of a patient decision aid (PtDA) to promote appropriate CRC screening in older adults. Methods. A total of 424 patients ages 70 to 84 y who were not up to date with CRC screening participated in a double-blinded randomized controlled trial of a PtDA targeted to older adults making decisions about whether to undergo CRC screening from March 2012 to February 2015. Intervention. Patients were randomized to a targeted PtDA or an attention control. The PtDA was designed to facilitate individualized decision making—helping patients understand the potential risks, benefits, and uncertainties of CRC screening given advanced age, health state, preferences, and values. Outcomes. Two composite outcomes, appropriate CRC screening behavior 6 mo after the index visit and appropriate screening intent immediately after the visit, were defined as completed screening or intent for patients in good health, discussion about screening with their provider for patients in intermediate health, and no screening or intent for patients in poor health. Health state was determined by age and Charlson Comorbidity Index. Results. Four hundred twelve (97%) and 421 (99%) patients were analyzed for the primary and secondary outcomes, respectively. Appropriate screening behavior at 6 mo was higher in the intervention group (55% v. 45%, P = 0.023) as was appropriate screening intent following the provider visit (61% v. 47%, P = 0.003). Limitations. The study took place in a single geographic region. The appropriate CRC screening classification system used in this study has not been formally validated. Conclusions. A PtDA for older adults promoted appropriate CRC screening behavior and intent.

Trial Registration: Clinicaltrials.gov, registration number NCT01575990. https://clinicaltrials.gov/ct2/show/NCT01575990?term=epic-d&rank=1

[Gastrointestinal endoscopy in patients of advanced age]

The dramatic increase in life expectancy is leading to a significant increase in the use of gastrointestinal endoscopy in the elderly. Taking into account these demographic changes, the use of gastrointestinal endoscopy in this age group is of great importance. Although these procedures are generally safe and well tolerated even in very elderly patients, the onset of physiological changes associated with aging and the increased prevalence of cardiovascular and pulmonary comorbidities raise the risk of sedation related complications in these patients. Age alone is not a contraindication for performing any endoscopic procedure. However, elderly patients have their own peculiarities that require a detailed review of the characteristics, risks and benefits of endoscopic procedures in this specific context.

Design of a randomized clinical trial of a colorectal cancer screening decision aid to promote appropriate screening in community-dwelling older adults

BACKGROUND

Appropriate colorectal cancer screening in older adults should be aligned with the likelihood of net benefit. In general, patient decision aids improve knowledge and values clarity, but in older adults, they may also help patients identify their individual likelihood of benefit and foster individualized decision-making. We report on the design of a randomized clinical trial to understand the effects of a patient decision aid on appropriate colorectal cancer screening. This report includes a description of the baseline characteristics of participants.

METHODS

English-speaking primary care patients aged 70-84 years who were not currently up to date with screening were recruited into a randomized clinical trial comparing a tailored colorectal cancer screening decision aid with an attention control. The intervention group received a decision aid that included a values clarification exercise and individualized decision-making worksheet, while the control group received an educational pamphlet on safe driving behaviors. The primary outcome was appropriate screening at 6 months based on chart review. We used a composite measure to define appropriate screening as screening for participants in good health, a discussion about screening for patients in intermediate health, and no screening for patients in poor health. Health state was objectively determined using patients' Charlson Comorbidity Index score and age.

RESULTS

A total of 14 practices in central North Carolina participated as part of a practice-based research network. In total, 424 patients were recruited to participate and completed a baseline visit. Overall, 79% of participants were White and 58% female, with a mean age of 76.8 years. Patient characteristics between groups were similar by age, gender, race, education, insurance coverage, or work status. Overall, 70% had some college education or more, 57% were married, and virtually all had Medicare insurance (90%). The three primary medical conditions among the cohort were a history of diabetes, pneumonia, and cancer (28%, 26%, and 21%, respectively).

CONCLUSION

We designed a randomized clinical trial to test a novel use of a patient decision aid to promote appropriate colorectal cancer screening and have recruited a diverse study population that seems similar between the intervention and control groups. The study should be able to determine the ability of a patient decision aid to increase individualized and appropriate colorectal cancer screening.

Optimal Bowel Cleansing for Colonoscopy in the Elderly Patient

Colonoscopy is an important diagnostic and screening tool for colorectal cancer detection and prevention, and adequate bowel preparation is critical for successful colonoscopy. Complications related to colonoscopy, either directly or indirectly related to the procedure, are increased in elderly patients, and the risks and benefits of colonoscopy procedures need to be carefully considered in these patients. Recent studies have shown that 4 L polyethylene glycol with a split preparation is safe and effective for elderly patients, and is the preferred preparation for patients with medical comorbidities. Preparations containing sodium phosphate are generally not recommended for the elderly because of increased renal complications. In addition, a low-residue diet may aid in tolerance and willingness to undergo the procedure compared with a clear liquid diet, with comparable bowel preparation adequacy. Risk factors for inadequate bowel preparations include poor adherence to split preparation instructions or volume of solution ingested, and certain patient-related medications and comorbidities, such as diabetes, elevated body mass index, and antidepressant or narcotic use. Methods for achieving safe and adequate bowel preparations in the elderly include clear instructions, reminder calls, and case management for potential confounding patient-related factors.

Barriers and facilitators to implementing continuous quality improvement programs in colonoscopy services: a mixed methods systematic review

BACKGROUND AND AIM

Continuous quality improvement (CQI) programs may result in quality of care and outcome improvement. However, the implementation of such programs has proven to be very challenging. This mixed methods systematic review identifies barriers and facilitators pertaining to the implementation of CQI programs in colonoscopy services and how they relate to endoscopists, nurses, managers, and patients.

METHODS

We developed a search strategy adapted to 15 databases. Studies had to report on the implementation of a CQI intervention and identified barriers or facilitators relating to any of the four groups of actors directly concerned by the provision of colonoscopies. The quality of the selected studies was assessed and findings were extracted, categorized, and synthesized using a generic extraction grid customized through an iterative process.

RESULTS

We extracted 99 findings from the 15 selected publications. Although involving all actors is the most cited factor, the literature mainly focuses on the facilitators and barriers associated with the endoscopists' perspective. The most reported facilitators to CQI implementation are perception of feasibility, adoption of a formative approach, training and education, confidentiality, and assessing a limited number of quality indicators. Receptive attitudes, a sense of ownership and perceptions of positive impacts also facilitate the implementation. Finally, an organizational environment conducive to quality improvement has to be inclusive of all user groups, explicitly supportive, and provide appropriate resources.

CONCLUSION

Our findings corroborate the current models of adoption of innovations. However, a significant knowledge gap remains with respect to barriers and facilitators pertaining to nurses, patients, and managers.

Risks and Benefits of Colonoscopy in Patients 90 Years or Older, Compared With Younger Patients

BACKGROUND & AIMS

Although the numbers of medical procedures performed on extremely elderly patients (90 years or older, nonagenarians) are increasing, there are no data on the performance, diagnostic yield, or safety of colonoscopy for these patients. We compared the performance and safety of diagnostic colonoscopy, as well as lesions detected, in nonagenarians with patients who were 75 to 79 years old.

METHODS

In a retrospective study, we compared data from 76 extremely elderly patients (90 years or older) with data from 140 very elderly patients (75 to 79 years old, controls), all of whom underwent diagnostic colonoscopy from January 2010 through March 2013 at Virginia Mason Medical Center. All colonoscopies were performed by 15 endoscopists. We compared rates of colonoscopy completion, bowel preparation quality, diagnostic yield, and adverse events.

RESULTS

In extremely elderly patients, more colonoscopies were performed under general anesthesia, compared with controls (P < .001). When extremely elderly patients underwent colonoscopies with moderate sedation, lower doses of midazolam and fentanyl were given, compared with controls (P < .001). Colonoscopies were completed in a lower proportion of extremely elderly patients (88.2% vs. 99.3% for controls, P < .001), and these patients had a higher incidence of inadequate bowel preparation (29.7% vs. 15.0% for controls, P = .011). Colonoscopies were also associated with cardiopulmonary events in a higher proportion of extremely elderly patients (P = .006) as well as overall adverse events, compared with controls (P = .002). A higher proportion of extremely elderly patients were found to have advanced neoplasia (28.4% vs. 6.4% of controls, P < .001) as well as any neoplasia (P < .001 vs. controls). A greater percentage of extremely elderly patients also had large lesions (P = .002) and malignancies detected by histology (P < .001 vs. controls). Eleven extremely elderly patients (14.9%) were found to have cancer or high-grade dysplasia by colonoscopy.

CONCLUSIONS

In patients 90 years or older, diagnostic colonoscopy is associated with increased risk for incomplete procedure, inadequate bowel preparation, and adverse events. However, a large proportion of patients are found to have advanced neoplasia and cancer, compared with patients 75 to 79 years old.

Colorectal cancer screening and surveillance in the elderly: updates and controversies

Colorectal cancer is common worldwide, and the elderly are disproportionately affected. Increasing age is a risk factor for the development of precancerous adenomas and colorectal cancer, thus raising the issue of screening and surveillance in older patients. Elderly patients are a diverse and heterogeneous group, and special considerations such as comorbid medical conditions, functional status and cognitive ability play a role in deciding on the utility of screening and surveillance. Colorectal cancer screening can be beneficial to patients, but at certain ages and under some circumstances the harm of screening outweighs the benefits. Increasing adverse events, poorer bowel preparation and more incomplete examinations are observed in older patients undergoing colonoscopy for diagnostic, screening and surveillance purposes. Decisions regarding screening, surveillance and treatment for colorectal cancer require a multidisciplinary approach that accounts not only for the patient’s age but also for their overall health, preferences and functional status. This review provides an update and examines the challenges surrounding colorectal cancer diagnosis, screening, and treatment in the elderly.

Would you recommend screening colonoscopy for the very elderly?

Life expectancy in Korea has increased, and the number of screening colonoscopies in the elderly has also dramatically increased. The net benefit of colonoscopy in the very elderly (≥80 years of age as defined by the World Health Organization) may be reduced because of the competing risk of mortality due to other diseases. Therefore, the decision to perform screening colonoscopy may be more complex in this age group. As the potential increase in life expectancy due to screening colonoscopy is significantly reduced in the very elderly, this procedure should be limited to those among the very elderly who have substantial life expectancies. Furthermore, considering the common major complications associated with colonoscopy, poor bowel preparation, and the possibility of incomplete colonoscopies in the very elderly, the performance of screening colonoscopy in the very elderly may not be an ideal recommendation. In terms of providing the greatest benefit to the most number of people, patients with the highest potential gain in terms of life expectancy, relative to the diagnostic yield, should be targeted for colonoscopy screening. This review addresses the unique considerations regarding screening colonoscopy in the very elderly and the individualized approach, which involves the weighing of the risks and benefits for each individual with consideration of their overall health status.

Colorectal cancer of the elderly

OPINION STATEMENT

Colorectal cancer (CRC) disproportionately affects the elderly. Older age is a strong risk factor for both the development of precancerous adenomas and CRC, thus raising the issue of screening and surveillance in older patients. However, screening and surveillance decisions in the elderly can be complex and challenging. Elderly patients are a diverse and heterogeneous group and special considerations such as co-morbid medical conditions, functional status, and cognitive ability play a role in one's decisions regarding the utility of screening and surveillance. Such considerations also play a role in factors related to screening modalities, such as colonoscopy, as well as CRC treatment options and regimens. This review addresses many of the unique factors associated with CRC of the elderly and critically examines many of the controversies and challenges surrounding CRC in older patients.

Colorectal cancer and the elderly

Colorectal cancer and precancerous adenomas disproportionately affect the elderly, necessitating the need for screening and surveillance in this group. However, screening and surveillance decisions in the elderly can be challenging. Special considerations such as comorbid medical conditions, functional status, and cognitive ability play a role in one's decisions regarding the utility of screening and surveillance as well as the success and safety of various screening modalities. This article explores the evidence for screening and surveillance in the elderly, and addresses key challenges unique to this population.

Metachronous colorectal cancer risk in patients with a moderate family history

AIM

Lifetime risk of a metachronous colorectal cancer (mCRC) is 0.6-3% following sporadic colorectal cancer (CRC) and 15-26% in Lynch syndrome. The lifetime incidence of CRC in individuals with moderate familial risk is 8-17%. Risk of mCRC is unknown.

METHOD

A retrospective longitudinal study of the Regional Familial CRC Registry was performed. Patients who had at least one CRC were categorized as follows: moderate risk (n = 383), Lynch syndrome (n = 528) and average (population) risk (n = 409). The Kaplan-Meier estimate (1-KM) and the cumulative incidence function were used to calculate the risk of mCRC. The 1-KM gives the risk for individuals remaining at risk (alive) at a given time point and thus is useful for counselling. The cumulative incidence function gives the risk for the whole population.

RESULTS

The 1-KM and the cumulative incidence function demonstrated that the risk of mCRC was significantly higher in moderate-risk patients compared with average (population)-risk patients (1-KM, P = 0.008; cumulative incidence function, P = 0.00097). However, the risk of mCRC was higher in patients with Lynch syndrome than in moderate-risk or average (population)-risk patients. The 1-KM in moderate-risk patients was 2.7%, 6.3% and 23.5% at 5, 10 and 20 years, respectively. In average (population)-risk patients, the 1-KM was 1.3%, 3.1% and 7.0% at 5, 10 and 20 years, and the cumulative incidence function was 0.3%, 0.6% and 2.4% at the same time points, respectively.

CONCLUSION

These data indicate that the risk of mCRC is significantly higher in patients with a moderate family history of CRC than in those with an average (population) risk. This justifies proactive lifelong surveillance.

Adverse events in older patients undergoing colonoscopy: a systematic review and meta-analysis

BACKGROUND

Studies suggest that advancing age is an independent risk factor for experiencing adverse events during colonoscopy. Yet many of these studies are limited by small sample sizes and/or marked variation in reported outcomes.

OBJECTIVE

To determine the incidence rates for specific adverse events in elderly patients undergoing colonoscopy and calculate incidence rate ratios for selected comparison groups.

SETTING AND PATIENTS

Elderly patients undergoing colonoscopy.

DESIGN

Systematic review and meta-analysis.

MAIN OUTCOME MEASUREMENTS

Perforation, bleeding, cardiovascular (CV)/pulmonary complications, and mortality.

RESULTS

Our literature search yielded 3328 articles, of which 20 studies met our inclusion criteria. Pooled incidence rates for adverse events (per 1000 colonoscopies) in patients 65 years of age and older were 26.0 (95% CI, 25.0-27.0) for cumulative GI adverse events, 1.0 (95% CI, 0.9-1.5) for perforation, 6.3 (95% CI, 5.7-7.0) for GI bleeding, 19.1 (95% CI, 18.0-20.3) for CV/pulmonary complications, and 1.0 (95% CI, 0.7-2.2) for mortality. Among octogenarians, adverse events (per 1000 colonoscopies) were as follows: cumulative GI adverse event rate of 34.9 (95% CI, 31.9-38.0), perforation rate of 1.5 (95% CI, 1.1-1.9), GI bleeding rate of 2.4 (95% CI, 1.1-4.6), CV/pulmonary complication rate of 28.9 (95% CI, 26.2-31.8), and mortality rate of 0.5 (95% CI, 0.06-1.9). Patients 80 years of age and older experienced higher rates of cumulative GI adverse events (incidence rate ratio 1.7; 95% CI, 1.5-1.9) and had a greater risk of perforation (incidence rate ratio 1.6, 95% CI, 1.2-2.1) compared with younger patients (younger than 80 years of age). There was an increased trend toward higher rates of GI bleeding and CV/pulmonary complications in octogenarians but neither was statistically significant.

LIMITATIONS

Heterogeneity of studies included and not all complications related to colonoscopy were captured.

CONCLUSIONS

Elderly patients, especially octogenarians, appear to have a higher risk of complications during and after colonoscopy. These data should inform clinical decision making, the consent process, public health policy, and comparative effectiveness analyses.

Colorectal cancer screening and surveillance in the elderly patient

Colorectal cancer (CRC) is the third leading cause of cancer-related deaths in the United States. Older age is associated with a rise in colorectal cancer and adenomas, necessitating the need for CRC screening in older patients. However, decisions about CRC screening and surveillance in older adults are often difficult and challenging. The decision requires an individualized assessment that incorporates factors unique to performing colonoscopy in older adults in order to weigh the risks and benefits for each patient according to their overall health and preferences. This review addresses the factors unique to colorectal cancer and performing colonoscopy in older adults that are relevant in weighing the risks and benefits of screening and surveillance in this population.

The influence of comorbidities on overall survival among older women diagnosed with breast cancer

BACKGROUND

Previous studies have shown that summary measures of comorbid conditions are associated with decreased overall survival in breast cancer patients. However, less is known about associations between specific comorbid conditions on the survival of breast cancer patients.

METHODS

The Surveillance, Epidemiology, and End Results-Medicare database was used to identify primary breast cancers diagnosed from 1992 to 2000 among women aged 66 years or older. Inpatient, outpatient, and physician visits within the Medicare system were searched to determine the presence of 13 comorbid conditions present at the time of diagnosis. Overall survival was estimated using age-specific Kaplan-Meier curves, and mortality was estimated using Cox proportional hazards models adjusted for age, race and/or ethnicity, tumor stage, cancer prognostic markers, and treatment. All statistical tests were two-sided.

RESULTS

The study population included 64,034 patients with breast cancer diagnosed at a median age of 75 years. None of the selected comorbid conditions were identified in 37,306 (58%) of the 64,034 patients in the study population. Each of the 13 comorbid conditions examined was associated with decreased overall survival and increased mortality (from prior myocardial infarction, adjusted hazard ratio [HR] of death = 1.11, 95% CI = 1.03 to 1.19, P = .006; to liver disease, adjusted HR of death = 2.32, 95% CI = 1.97 to 2.73, P < .001). When patients of age 66-74 years were stratified by stage and individual comorbidity status, patients with each comorbid condition and a stage I tumor had similar or poorer overall survival compared with patients who had no comorbid conditions and stage II tumors.

CONCLUSIONS

In a US population of older breast cancer patients, 13 individual comorbid conditions were associated with decreased overall survival and increased mortality.

Accuracy of Medicare claims for identifying findings and procedures performed during colonoscopy

BACKGROUND

Administrative claims data are frequently used for quality measurement.

OBJECTIVE

To examine the accuracy of administrative claims for potential colonoscopy quality measures, including findings (polyp or tumor detection), procedures (biopsy or polypectomy), and incomplete colonoscopy.

DESIGN

Cross-sectional study.

PATIENTS

Patients age 65 and older undergoing colonoscopy in the Clinical Outcomes Research Initiative National Endoscopic Database in 2006. We linked colonoscopy records for these patients to Medicare colonoscopy claims by using patient age, sex, date of procedure, and performing provider's Unique Physician Identification Number.

MAIN OUTCOME MEASUREMENTS

Sensitivity, specificity, positive and negative predictive values of the Medicare claims for potential quality measures, including colonoscopy findings and procedures.

RESULTS

We linked Medicare colonoscopy claims to 15,168 of the 30,011 Clinical Outcomes Research Initiative colonoscopy records. Sensitivity of the claims for colon polyps was 93.4%, with a specificity of 97.8%. Sensitivity of claims for other diagnoses, including colorectal tumors was suboptimal, although specificity was high. In contrast, sensitivity of claims for procedures-biopsy (with or without cautery) or polypectomy-was high (87.2%-97.6%), with specificity >97%. Claims had poor sensitivity for identification of incomplete colonoscopy.

LIMITATIONS

Potential for inaccurate matching of colonoscopy records and Medicare claims.

CONCLUSIONS

Medicare claims have high sensitivity and specificity for polyp detection, biopsy, and polypectomy at colonoscopy, but sensitivity is low for other diagnoses such as tumor detection and for incomplete colonoscopy. Caution is needed when using Medicare claims data for certain important quality measures, in particular tumor detection and incomplete colonoscopy.

User's perspectives of barriers and facilitators to implementing quality colonoscopy services in Canada: a study protocol

BACKGROUND

Colorectal cancer (CRC) represents a serious and growing health problem in Canada. Colonoscopy is used for screening and diagnosis of symptomatic or high CRC risk individuals. Although a number of countries are now implementing quality colonoscopy services, knowledge synthesis of barriers and facilitators perceived by healthcare professionals and patients during implementation has not been carried out. In addition, the perspectives of various stakeholders towards the implementation of quality colonoscopy services and the need of an efficient organisation of such services have been reported in the literature but have not been synthesised yet. The present study aims to produce a comprehensive synthesis of actual knowledge on the barriers and facilitators perceived by all stakeholders to the implementation of quality colonoscopy services in Canada.

METHODS

First, we will conduct a comprehensive review of the scientific literature and other published documentation on the barriers and facilitators to implementing quality colonoscopy services. Standardised literature searches and data extraction methods will be used. The quality of the studies and their relevance to informing decisions on colonoscopy services implementation will be assessed. For each group of users identified, barriers and facilitators will be categorised and compiled using narrative synthesis and meta-analytical techniques. The principle factors identified for each group of users will then be validated for its applicability to various Canadian contexts using the Delphi study method. Following this study, a set of strategies will be identified to inform decision makers involved in the implementation of quality colonoscopy services across Canadian jurisdictions.

DISCUSSION

This study will be the first to systematically summarise the barriers and facilitators to implementation of quality colonoscopy services perceived by different groups and to consider the local contexts in order to ensure the applicability of this knowledge to the particular realities of various Canadian jurisdictions. Linkages with strategic partners and decision makers in the realisation of this project will favour the utilisation of its results to support strategies for implementing quality colonoscopy services and CRC screening programs in the Canadian health system.

Endoscopic surveillance after curative surgery for sporadic colorectal cancer: patient-tailored, tumor-targeted or biology-driven?

OBJECTIVE

Endoscopy has been endorsed and introduced in most surveillance programs following curative surgery for colorectal cancer (CRC), yet little data are available to support its use in terms of patient selection, efficacy and frequency of surveillance.

MATERIAL AND METHODS

A literature search in the English language using the PubMed/Medline database for the MeSH terms "colorectal cancer", "surveillance", and "endoscopy", with focus on sporadic CRC, excluding CRC developed on a hereditary or inflammatory bowel disease background. Focus on results from the past 5 years was applied.

RESULTS

Recent systematic reviews, meta-analyses, randomized trials and prospective studies made the backbone of the article, supported by population-based findings and recent reports on tumor biology. Hard evidence to support a survival benefit from endoscopy alone is lacking. Definitions of "synchronous", "interval", and "metachronous" cancers are not uniform and hampers comparison of studies. The number of metachronous cancers (usually 2-4%) that develop after curative CRC surgery is small, and better patient-tailored surveillance could improve the diagnostic yield. Compliance with endoscopy is low compared to other modalities. Age and socio-demographic factors influence on the surveillance coverage and need to be addressed in any given program. The majority of local recurrences occur within the first 3 years after surgery independent of stage, and microsatellite instable (MSI) tumors appear to be at higher risk.

CONCLUSIONS

Endoscopy in surveillance after curative surgery for CRC is a resource demanding procedure. A tailored approach according to factors associated with an increased risk for metachronous cancer/local recurrence would increase efficiency.

Advances in colorectal cancer screening

Colorectal cancer (CRC) remains the third most commonly diagnosed cancer and second leading cause of cancer death in the United States. Declines in CRC incidence and mortality over the past 20 years were attributed to CRC screening. Yet, only slightly more than half of the eligible at-risk population acknowledge being screened. To effectively meet the demands of screening in an enlarging, ethnically diverse, and aging population, a variety of modalities are needed. This article provides a focused assessment of effectiveness, limitations, and alternative available screening methods. New modalities endorsed in the updated guidelines (eg, fecal immunochemical tests, fecal DNA, and CT colonography) are reviewed. In addition, advances and updates in existing tests (eg, guaiac-based fecal occult blood tests and colonoscopy) are evaluated.

Provider recommendations for colorectal cancer screening in elderly veterans

BACKGROUND

Decisions regarding colorectal cancer (CRC) screening in the elderly depend on providers' assessment of likelihood of benefit partly based on patient comorbidity and past screening history. We aimed to describe providers' experiences and practice patterns regarding screening for CRC in elderly patients in the VA system.

METHODS AND PARTICIPANTS

A survey was sent to VA primary care providers who had previously participated in the CanCORS-sponsored Share Thoughts on Care study and at a VA medical center. The surveys consisted of clinical vignettes that varied by patient age (75, 80, or 85 years), comorbidity, and past CRC screening history.

MAIN RESULTS

Completed questionnaires were received from 183 of 351 providers (52%). Ninety-five percent of providers would recommend screening for a healthy 75 year old compared to 66% and 39% for a healthy 80 and 85 year old, respectively (p-values < 0.0001). Providers were more likely to recommend screening for a 75 year old with moderate CHF versus severe CHF [61% versus 15%, OR 9.0 (95% CI 5.8-14.0), p < 0.0001] and more likely to recommend screening for an 80 year old with prior colonoscopy within the preceding 10 years, versus 5 years [42% versus 23%, OR 2.6 (95% CI 1.9-3.5), p < 0.0001]. A substantial minority of respondents (range 15-21%) reported they would screen a 75 year old with an active malignancy, severe CHF, or severe COPD. Provider demographic characteristics were not significantly associated with the probability of a screening recommendation.

CONCLUSIONS

VA providers incorporate patient age, comorbidity, and past CRC screening history into CRC screening recommendations for elderly veterans; however, substantial proportions of these recommendations are inappropriate.

Cost-effectiveness analysis on screening for colorectal neoplasm and management of colorectal cancer in Asia

BACKGROUND

Faecal occult blood testing (FOBT), flexible sigmoidoscopy (FS) and colonoscopy are recommended for subjects above 50 years of age for screening for colorectal cancer (CRC).

AIM

To evaluate the cost-effectiveness of FOBT, FS and colonoscopy on the basis of disease prevalence, compliance rate and cost of screening procedures in Asian countries.

METHODS

A hypothetical population of 100 000 persons aged 50 undergoes either FOBT annually, FS every 5 years or colonoscopy every 10 years until the age of 80 years. Patients with positive FOBT or polyp in FS are offered colonoscopy. Surveillance colonoscopy is repeated every 3 years. The treatment cost of CRC, including surgery and chemotherapy, was evaluated. A Markov model was used to compare the cost-effectiveness of different screening strategies.

RESULTS

Assuming a compliance rate of 90%, colonoscopy, FS and FOBT can reduce CRC incidence by 54.1%, 37.1% and 29.3% respectively. The incremental cost-effectiveness ratio (ICER) for FOBT (US$6222 per life-year saved) is lower than FS (US$8044 per life-year saved) and colonoscopy (US$7211 per life-year saved). When the compliance rate drops to 50% and 30%, FOBT still has the lowest ICER.

CONCLUSION

FOBT is cost-effective compared to FS or colonoscopy for CRC screening in average-risk individuals aged from 50 to 80 years.

Epidemiology and quality control of 245 000 outpatient colonoscopies

INTRODUCTION

Screening colonoscopy is an effective means for early detection of colorectal carcinoma. Any exhaustive evaluation of the method must take further factors into account: epidemiology of colorectal adenomas and carcinomas in the target population, acceptance by the patients, structure, process, and outcome quality, and health economics.

METHODS

The internet-based colonoscopy database of the Bavarian Association of Statutory Health Insurance Physicians (ASHIP) for the year 2006 includes data on 86.05% of all outpatient colonoscopies performed in Bavarian ASHIP patients, or a total of 245 263 documented examinations.

RESULTS

The rate of participation in preventive colonoscopies was low (1.5%) and showed considerable geographical variation. The rate of detection of histologically confirmed colorectal neoplasia in symptom-free screened individuals was almost 26.0%. Some 1.3% of those screened had colorectal carcinoma. In 76.31% of the participants a completely clean gut was achieved. The incidence of bleeding, perforation, and cardiorespiratory complications was 0.22%, 0.03%, and 0.06%, respectively.

DISCUSSION

The complication rate of outpatient colonoscopy is on the order of tenths of a percent, while the process quality is high. The rate of detection of colorectal adenoma and carcinoma is high and the projected benefits for public health are considerable, but the rate of participation is too low.