A111 CLINICAL AND PATHOLOGICAL OUTCOMES BETWEEN WATER EXCHANGE AND AIR INSUFFLATION USING NON-SEDATED EXTENDED FLEXIBLE SIGMOIDOSCOPY FOR AVERAGE RISK COLORECTAL CANCER SCREENING: PRELIMINARY FINDINGS FROM A RANDOMIZED CONTROL TRIAL

Background

Colorectal cancer (CRC) is Canada's third most common cancer type and represents approximately 11% of all cancer deaths. While sedated colonoscopy or flexible sigmoidoscopy (FS) continues to be considered for CRC screening, these modalities have limitations and risks. Another unevaluated screening modality, known as an extended FS (EFS), attempts to capitalize on the benefits of a FS while minimizing the risks involved with a sedated colonoscopy. EFS provides a scope-based examination up to the splenic flexure and then attempts to examine beyond, often to the point of the caecum. Providing the option for EFS may produce improvements in the patient experience and performance, which may improve the feasibility of using scope-based screening more broadly in screening programs.

Purpose

To determine the extent non-sedated EFS using the water exchange method (WE) is associated with a complete colon examination compared to the traditional air insufflation (AI) method using CO2 in an average-risk screening population.

Method

This randomized control trial included 90 non-sedated participants, screened by trained general surgery and gastroenterology clinicians at Kelowna General Hospital, British Columbia, Canada, using two different scope insufflation techniques, WE and AI. The primary outcome of interest was the cecal intubation rates (CIR), while secondary outcomes included the adenoma detection rate (ADR) and reported pain scores. Other metrics, such as patient satisfaction rates, sessile serrated adenoma detection rates (SSADR), and serrated lesion detection rates (SLDR) were also recorded.

Result(s)

The demographic characteristics between the WE and AI groups were statistically similar, with the mean age of participants being 58 and 57, respectively. During the study period, four endoscopists performed the EFS. There were higher initial satisfaction rates in the WE group vs the AI (95% vs 77%, satisfaction of ≥ 9/10 p = 0.028). CIR and ADR were similar between the WE and AI group (CIR = 93% vs 91%, p = 0.710), (ADR = 40% vs 34%, p = 0.660). The SSADR and SLDR were also similar between the WE and AI group (SSADR = 21% vs 14%, p = 0.408), (SLDR = 42% vs 36%, p = 0.528).

Conclusion(s)

EFS without sedation using either technique exceeds quality benchmarks recommended for sedated screening colonoscopy while maintaining adequate patient safety and comfort. The WE method optimizes a patient's overall experience making a strategy of average risk colorectal cancer screening with non-sedated WE EFS feasible.

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CAG, Other

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Kelowna General Hospital, Interior Health

Disclosure of Interest

None Declared

Drastic elevations in mortality among female injection drug users in a Canadian setting

The health and social conditions of women living in Vancouver's Downtown Eastside has recently been the focus of substantial international attention. Since few studies have examined rates and correlates of death among addicted women in Canada, we have characterized patterns of mortality among female injection drug users (IDUs) in Vancouver. The Vancouver Injection Drug Users Study (VIDUS) is a prospective open cohort study of IDUs. The analyses presented here, were restricted to women enrolled between May 1996 and May 2002 and who were aged 14 years or older. We estimated cumulative mortality rates using Kaplan-Meier methods and Cox regression was used to calculate univariate and adjusted relative hazards. Between May 1996 and May 2002, 520 female IDUs have been recruited from the Vancouver area among whom 68 died during the study period. Elevated rates of mortality were observed among those who reported, baseline sex-trade involvement, those with HIV-infection at baseline, and those who lived in unstable housing at baseline (all log-rank: p<0.05). In adjusted analyses, HIV infection (RH = 3.09 [95% CI: 1.86-5.11]; p<0.001), unstable housing (RH = 1.74 [95% CI: 1.10-2.86]; p=0.029) and sex-trade involvement (RH = 1.82 [95% CI: 0.95-3.45]; p=0.071) were associated with the time to death. When the number of observed deaths was compared to the number of expected deaths based on the general female population of British Columbia using indirect standardization, the rate of death among female IDUs was elevated by a factor of 47.3 (95% CI: 36.1-58.5). In Vancouver, female IDUs have rates of mortality almost 50 times that of the province's female population. Our findings are consistent with a growing number of reports from other settings internationally, and demonstrate the need for an appropriate evidence-based strategy to address the health and social needs of addicted women.