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Colorectal cancer is the third most common cancer worldwide and ranks fourth among cancer killers1. The highest incidence rates occur in Australia, New Zealand, Canada, the USA, and parts of Europe2. Colonoscopy is effective for screening and prevention of colorectal cancer, and colonoscopic screening has been shown to save lives3. The procedure is recommended by multiple governmental and advocacy organizations as an effective means of screening for colon cancer4-6.
Well-accepted methods of screening for colorectal cancer include annual fecal occult blood testing and endoscopic screening. Despite the consensus recommendations for colon cancer screening in general, and for colonoscopy specifically, only 65% of people in the USA are current on their colon cancer screening7. Internationally, there is inadequate capacity to screen all eligible persons8-13. As the populations in both developing and developed countries age, it is anticipated that the need for well-trained endoscopists will continue to rise.
Residents in rural areas are screened for colon cancer at lower rates than their urban counterparts14-19. Most rural physicians are generalists and are not trained in colonoscopy. In the USA and Canada the majority of colonoscopies are performed by gastroenterologists20. In the USA overall, only 2.6% of family physicians provide colonoscopy to their patients, but this rate may be higher in rural areas21,22. If colonoscopies are to be available for colon cancer screening for patients in rural areas of developed countries, then generalists will need to be able to safely and efficaciously provide this service.
There are widely accepted standards for safe and effective colonoscopy that include reach-the-cecum rate (RCR), adenoma detection rate, cancer detection rate and rates of complications. The National Bowel Cancer Screening Program (NBCSP) Quality Working Group (Australia)23, the American College of Gastroenterology/American Society of Gastrointestinal Endoscopists24, the National Health Service in England25 and the Canadian Association of Gastroenterology26 have all published guidelines.
The purpose of this article is to systematically review available studies of rural colonoscopy to determine which types of providers are performing the procedure and to assess the reported quality of these procedures. Evidence of quality and effectiveness of colonoscopies provided by rural physicians is needed to guide development of programs to increase colonoscopy capacity in rural areas.
Study selection
A systematic literature search was conducted utilizing MEDLINE from 1951 to 1 September 2013. A search strategy was developed combining medical subject headings (MeSH) and text key words (tw) for (colonoscopy[tw] OR colonoscopies[tw] OR 'colonoscopy'[MeSH Terms:noexp] OR polypectomy[tw] OR polypectomies[tw]) AND rural[tw]. The search was not restricted by language. Inclusion criteria were rural location, report of quality outcomes, or report of endoscopy workforce in rural areas. Two investigators (DE, AC) reviewed potentially relevant articles independently, with differences resolved through discussion. To ensure completeness of the literature search, citation lists for the included studies published in the previous 5 years were reviewed. Additional articles identified through review of citation lists were reviewed and included if appropriate. This study did not meet criteria for human subjects research and did not require Institutional Review Board approval.
Data abstraction and validity assessment
Two reviewers (DE, AC) independently reviewed and abstracted data from each included study using a standardized data abstraction tool (Appendix I). The following information was obtained from each study: author identification, citation, study design, source of funding, study duration and follow-up, study population, sample size, study setting, population characteristics, outcomes and results. Validity was assessed using an Agency for Healthcare Research and Quality tool for assessing the strength of scientific evidence27. Each reviewer assessed for potential bias in assigning exposure and measuring outcomes, as well as incomplete reporting or selective reporting.
The search strategy identified 121 potentially eligible articles. After reviewing the abstracts and full texts when needed, only 11 articles met inclusion criteria. Ten of the included articles measured colonoscopy quality by rural physicians28-37. One study reported on the rural colonoscopy workforce20. An additional article on colonoscopy quality38 was identified by review of a 2009 meta-analysis of colonoscopy by primary care physicians39. There were no eligible systematic reviews, meta-analyses or randomized studies. Articles were excluded if they did not report standard quality outcomes or did not report results from colonoscopies done in a rural setting. Only primary research studies, not review articles, were included.
Table 1 summarizes the characteristics of the 11 studies measuring colonoscopy quality by rural practitioners. It includes four reports from Canada, one from Australia and six from the USA. The studies encompass 8703 procedures by 25 colonoscopists. Ten of the 11 studies report on consecutive procedures. Seven collected data prospectively, three were retrospective chart reviews, and one did not report the method of data collection. Five were multi-physician studies. Colonoscopist training is summarized when available.
Table 2 displays the results of the 11 studies reporting colonoscopy quality measures. All studies reported RCR, adenomatous polyp detection rates and cancer detection rates. Four studies reported procedure time and one reported on scope withdrawal time. All studies reported complications of perforation and bleeding. Other reported complications included sedation complications and referrals to specialists, but there was considerable variation in how these complications were defined.
RCRs ranged from 36% to 96.5%. In studies less than 10 years old representing 6454 cases the RCR ranged from 80.6% to 96.5%. Adenoma detection rates ranged from 16.6% to 46%. Cancer detection rates ranged from 0.4% to 2.1%. Complications were uncommon. A total of six perforations, ten bleeding events and nine sedation complications were reported.
Studies focusing on the rural colonoscopist workforce studies were scarce. Hilsden et al. conducted a national study of Canadian endoscopists performing more than 100 cases per year20. In rural areas, 54% of colonoscopies were performed by general surgeons, 39% by gastroenterologists, and only 7% were performed by generalists.
Table 1: Summary of published studies reporting results of rural colonoscopy
Table 2: Summary of quality of colonoscopies performed in rural areas
Discussion
This systematic review contributes to the growing body of literature that demonstrates that well-trained primary care providers can safely and effectively perform colonoscopy in rural settings. This is particularly important in developed countries where colonoscopy is the standard of care for colon cancer screening but access to colonoscopy in rural areas is limited.
Who performs colonoscopy in rural communities?
The only study meeting inclusion criteria and specifically focusing on workforce demonstrated that general surgeons perform most colonoscopy procedures in rural Canadian communities. The American Academy of Family Physicians workforce study noted that a small minority (2.6%) of US family physicians provide colonoscopy for their patients but it did not report on the rurality of these physicians. The vast majority of studies included in this review reporting quality showed cases by family physicians or general practitioners. Based on this literature review, the question of who provides colonoscopies in rural areas is unanswered. Future research to assess availability and training of colonoscopy providers in rural areas is warranted.
What, where and how well?
In contrast to the paucity of data around 'who' comprises the rural colonoscopy workforce, this review reports on 8703 colonoscopies by 25 rural physicians in three countries. Most studies report on both screening and diagnostic colonoscopies. The majority of these studies demonstrate high quality as measured by the generally accepted measures of reaching the cecum, adenoma detection and cancer detection.
Rex et al. report that 90% of all colonoscopies should reach the cecum and that the percentage should increase to 95% for screening exams40. However, a 2003 study of more than 17 000 procedures by 69 gastroenterologists in North America showed a median RCR of 88%. Only 55% of physicians had an RCR of 90% or greater41.
RCRs of rural colonoscopists are consistent with recommended standards. The present review found that 6 of 11 studies, representing 5411 of 8703 procedures, reported RCRs exceeding the 90% recommended by Rex et al29-32,34,35. One additional study of 1178 procedures exceeded 88%28. In the 1996 case series of 1048 procedures by Hopper et al36, they reported an RCR of only 36% in non-sedated patients. Using sedation the RCR increased to 93%.
The studies included in this review show variation in both cancer and adenoma detection rates. This variation is consistent with other studies of experienced colonoscopists40,42,43. Current accepted benchmarks of adenoma detection on screening of normal risk individuals are 25% in males and 15% in females23-26. Kolber et al. is the only study in this review that reported adenoma detection by gender, but included multiple indications for colonoscopy29.
While a small number of studies reported quality over time and demonstrated a training effect with respect to RCR30,32-34, other included studies did not29,31,35. Previous studies of gastroenterologists in training show improved quality with number of procedures44. There may also be improvement in performance with improvements in technology, as more recent cases show better RCRs.
A recent study from Canada reports that patients who have a negative colonoscopy performed by a gastroenterologist are less likely to develop colorectal cancer than those performed by people from other specialties45. This study reports on more than 110 000 cases but draws on data from 1992 to 1997. This finding was only significant among cases performed in a hospital and was not statistically significant among cases completed in a private/office setting. Further studies will be needed to corroborate these results.
This systematic review shows lower-than-expected rates of complications among rural colonoscopists. Frequency of colon perforation is reported at 0.14-0.65% for diagnostic procedures46,47. Perforations during therapeutic procedures in prior studies were found to be as high as 3%48. Only seven perforations were reported among the 8703 procedures (0.07%) reported here. The percentage of bleeding complications was only 0.11%. Many of the studies included here are from single providers. These solo endoscopists might have considerable influence on which patients are eligible for procedures locally and which patients require specialty referral. Referring physicians in a rural community might send more complex cases to tertiary settings as well. This could influence the low complication rate. Meyer et al. found that generalist cases are often of lower complexity than cases done by gastroenterologists49.
Limitations
This systematic review has multiple limitations. First, five of the studies reporting quality data are of cases performed by a single physician who was often the author. These cases may not be representative of rural endoscopists as a whole and may also introduce reporting bias. Second, most of the studies include multiple indications for colonoscopy or do not report specific indications as part of their data. Accepted benchmarks for cecal intubation and polyp and cancer detection are specific for screening exams. If a case series includes more repeat procedures, for example, the adenoma detection rate might be artificially high. Similarly, therapeutic procedures usually take longer and often result in higher complication rates.
This systematic review of 11 studies reporting on 8703 colonoscopies performed by rural generalists in three countries demonstrates that rural physicians can perform colonoscopies safely and effectively. These cases demonstrate cancer and adenoma detection rates consistent with generally acceptable standards and practices with correspondingly low rates of complications. Not enough data was available to draw conclusions about the specialty distribution of the rural colonoscopist workforce. However, it is clear that more rural colonscopists will be required to perform the recommended colon cancer screening on rural patients in developed countries. Training programs should be developed to address this need for high quality and effective rural colonoscopy.
Acknowledgements
The authors would like to thank Sarah Safranek, Information Management Librarian, at the University of Washington Health Sciences Library for her assistance with the literature search for this manuscript.
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Appendix I: Individual studies abstract form?
