Image-enhanced endoscopy is specific for the diagnosis of non-erosive gastroesophageal reflux disease.

OBJECTIVES: We assessed the performance characteristics of image-enhanced endoscopy with i-Scan or narrow band imaging (NBI) in patients with non-erosive gastroesophageal reflux disease (GERD) compared to controls without heartburn. MATERIAL AND METHODS: Image-enhanced endoscopic findings of vascularity at the squamocolumnar junction, distal esophageal micro-erosions, and non-round pit pattern at the squamocolumnar junction were assessed in cases (heartburn not responsive to PPIs, positive results on validated GERD questionnaire, no esophageal erosions, esophageal biopsies with histologic evidence of GERD (basal cell hyperplasia, elongation of papillae and dilation of intercellular spaces all required)) and in controls (no GERD symptoms or esophageal erosions). RESULTS: Twenty cases and 60 controls were compared. The pre-defined features were more common in cases vs. CONTROLS: vascularity RR = 4.9 (95% CI: 2.4-10.0), specificity = 86.7%; micro-erosions RR = 9.7 (3.6-26.5), specificity = 93.3%; non-round pit pattern RR = 2.4 (1.7-3.3), specificity = 60.0%; combination of vascularity and micro-erosions RR = 30.0 (4.1-220), specificity = 98.3%. These differences were consistent with both i-Scan and NBI. CONCLUSIONS: Image-enhanced endoscopic findings of vascularity and micro-erosions were very specific for non-erosive GERD. Image-enhanced endoscopy may be useful in real-time diagnosis of non-erosive GERD when patients undergo upper endoscopy for heartburn. The relative utility of image-enhanced endoscopy vs. pH-impedance monitoring, based on efficacy, cost and patient acceptance, requires additional study.

Yield of repeat forward-view examination of the right side of the colon in screening and surveillance colonoscopy.

BACKGROUND AND AIMS: Colonoscopy is less protective for cancers of the right side of the colon than for distal colon cancers. Repeat examination of the right side of the colon has been suggested to increase adenoma detection and potentially provide greater protection against the development of cancers of the right side of the colon. Our prospective study assessed the yield of a second forward-view examination of the right side of the colon done immediately after the initial examination. METHODS: All men 50 to 75 years of age undergoing screening or surveillance colonoscopy at the West Haven Veterans Affairs Medical Center were invited to participate. A second forward-view examination was performed if the Boston Bowel Preparation Scale score was 8 to 9 (scale = 0-9) with right a side of the colon segment score of 2 to 3 (scale = 0-3). The primary outcome was the per-patient adenoma detection rate (including sessile serrated polyps) on a repeated examination of the right side of the colon, defined as the number of patients with ≥1 adenoma on the second examination of the right side of the colon divided by total number of patients. An increase in the adenoma detection rate (ADR) was a secondary outcome. RESULTS: Repeated examination of the right side of the colon, performed in 280 patients, revealed additional adenomas in 43 patients (15.4%; 95% confidence interval [CI] of difference, 11.3%-21.0%). The overall ADR increased by 3.2% (95% CI, 1.1%-5.3%) after the second examination of the right side of the colon; the ADR for the right side of the colon increased by 6.7% (95% CI, 3.8%-9.7%). Ten patients (3.6%) had a change in their screening/surveillance interval with the addition of findings on the second examination of the right side of the colon. CONCLUSION: A substantial 15.4% of patients had additional adenomas detected on a second forward-view examination of the right side of the colon, whereas the overall ADR increased significantly by 3.2%. Given the lack of additional training or equipment required, repeated forward-view examination of the right side of the colon is a simple, readily available method to achieve a modest improvement in the ADR.

Quantitative analysis of high-resolution microendoscopic images for diagnosis of neoplasia in patients with Barrett's esophagus.

BACKGROUND AND AIMS: Previous studies show that microendoscopic images can be interpreted visually to identify the presence of neoplasia in patients with Barrett's esophagus (BE), but this approach is subjective and requires clinical expertise. This study describes an approach for quantitative image analysis of microendoscopic images to identify neoplastic lesions in patients with BE. METHODS: Images were acquired from 230 sites from 58 patients by using a fiberoptic high-resolution microendoscope during standard endoscopic procedures. Images were analyzed by a fully automated image processing algorithm, which automatically selected a region of interest and calculated quantitative image features. Image features were used to develop an algorithm to identify the presence of neoplasia; results were compared with a histopathology diagnosis. RESULTS: A sequential classification algorithm that used image features related to glandular and cellular morphology resulted in a sensitivity of 84% and a specificity of 85%. Applying the algorithm to an independent validation set resulted in a sensitivity of 88% and a specificity of 85%. CONCLUSIONS: This pilot study demonstrates that automated analysis of microendoscopic images can provide an objective, quantitative framework to assist clinicians in evaluating esophageal lesions from patients with BE. ( CLINICAL TRIAL REGISTRATION NUMBER: NCT01384227 and NCT02018367.).

Diagnosis of sessile serrated adenomas/polyps with image-enhanced endoscopy: a systematic review and meta-analysis.

BACKGROUND AND STUDY AIMS: Distinguishing sessile serrated adenomas/polyps (SSA/Ps) from non-neoplastic tissue may be challenging when white-light endoscopy (WLE) is used. Image-enhanced endoscopy (IEE) has shown accuracy in differentiating adenomas from hyperplastic polyps. The aim of this systematic review and meta-analysis was to evaluate the utility of IEE in diagnosis of SSA/Ps. METHODS: Studies were eligible if: they included patients undergoing colonoscopy with an endoscopy-based image-enhancement modality; endoscopic diagnoses, including SSA/P, were based on the appearance of polyps at IEE; and the corresponding histologic diagnoses of polyps were provided. The primary outcome was sensitivity of IEE for SSA/Ps differentiated from non-neoplastic lesions (primary convention) and differentiated from all non-SSA/P lesions, including adenomas (secondary convention). RESULTS: 13 studies met inclusion criteria. Sensitivity ranged from 38 % to 100 % but sensitivity ≥ 90 % was seen in 4 of 10 narrow band imaging (NBI) or magnification-NBI studies. Pooled sensitivities for discriminating SSA/Ps from non-neoplastic lesions were 80 % for magnification-NBI, 60 % for NBI, 49 % for autofluorescence, and 47 % for flexible spectral imaging color enhancement. In head-to-head comparisons with WLE, NBI (89 % vs. 75 %) and magnification-NBI (78 % vs. 63 %) demonstrated significantly greater sensitivity, while autofluorescence imaging (56 % vs. 66 %), flexible spectral imaging color enhancement (100 % vs. 100 %), and high-resolution endomicroscopy (88 % vs. 100 %) did not. CONCLUSION: IEE currently cannot be recommended as a diagnostic tool for SSA/P. While NBI studies showed promise, more IEE studies employing validated SSA/P criteria in well-defined polyp populations are needed. IEE studies assessing SSA/P detection rates at colonoscopy are also needed.

In vivo classification of colorectal neoplasia using high-resolution microendoscopy: Improvement with experience.

BACKGROUND AND AIMS: High-resolution microendoscopy (HRME) is a novel, low-cost "optical biopsy" technology that allows for subcellular imaging. The study aim was to evaluate the learning curve of HRME for the differentiation of neoplastic from non-neoplastic colorectal polyps. METHODS: In a prospective cohort fashion, a total of 162 polyps from 97 patients at a single tertiary care center were imaged by HRME and classified in real time as neoplastic (adenomatous, cancer) or non-neoplastic (normal, hyperplastic, inflammatory). Histopathology was the gold standard for comparison. Diagnostic accuracy was examined at three intervals over time throughout the study; the initial interval included the first 40 polyps, the middle interval included the next 40 polyps examined, and the final interval included the last 82 polyps examined. RESULTS: Sensitivity increased significantly from the initial interval (50%) to the middle interval (94%, P = 0.02) and the last interval (97%, P = 0.01). Similarly, specificity was 69% for the initial interval but increased to 92% (P = 0.07) in the middle interval and 96% (P = 0.02) in the last interval. Overall accuracy was 63% for the initial interval and then improved to 93% (P = 0.003) in the middle interval and 96% (P = 0.0007) in the last interval. CONCLUSIONS: In conclusion, this in vivo study demonstrates that an endoscopist without prior colon HRME experience can achieve greater than 90% accuracy for identifying neoplastic colorectal polyps after 40 polyps imaged. HRME is a promising modality to complement white light endoscopy in differentiating neoplastic from non-neoplastic colorectal polyps.

Clinical factors that predict noncirrhotic portal hypertension in HIV-infected patients: a proposed diagnostic algorithm.

Noncirrhotic portal hypertension (NCPH) is a rare but important clinical entity in human immunodeficiency virus (HIV) populations. The purpose of this study was to describe the clinical factors associated with the condition in an effort to formulate a diagnostic algorithm for easy and early diagnosis. We performed a multicenter, retrospective case-control study of 34 patients with NCPH and 68 control HIV patients. The study found that thrombocytopenia, splenomegaly, didanosine use, elevated aminotransferases, and an elevated alkaline phosphatase level were all significantly more prevalent in the NCPH cohort. Using these easily available clinical parameters, we developed an algorithm for early diagnosis of NCPH in HIV.

In vivo diagnostic accuracy of high-resolution microendoscopy in differentiating neoplastic from non-neoplastic colorectal polyps: a prospective study.

OBJECTIVES: High-resolution microendoscopy (HRME) is a low-cost, "optical biopsy" technology that allows for subcellular imaging. The purpose of this study was to determine the in vivo diagnostic accuracy of the HRME for the differentiation of neoplastic from non-neoplastic colorectal polyps and compare it to that of high-definition white-light endoscopy (WLE) with histopathology as the gold standard. METHODS: Three endoscopists prospectively detected a total of 171 polyps from 94 patients that were then imaged by HRME and classified in real-time as neoplastic (adenomatous, cancer) or non-neoplastic (normal, hyperplastic, inflammatory). RESULTS: HRME had a significantly higher accuracy (94%), specificity (95%), and positive predictive value (PPV, 87%) for the determination of neoplastic colorectal polyps compared with WLE (65%, 39%, and 55%, respectively). When looking at small colorectal polyps (less than 10 mm), HRME continued to significantly outperform WLE in terms of accuracy (95% vs. 64%), specificity (98% vs. 40%) and PPV (92% vs. 55%). These trends continued when evaluating diminutive polyps (less than 5 mm) as HRME's accuracy (95%), specificity (98%), and PPV (93%) were all significantly greater than their WLE counterparts (62%, 41%, and 53%, respectively). CONCLUSIONS: In conclusion, this in vivo study demonstrates that HRME can be a very effective modality in the differentiation of neoplastic and non-neoplastic colorectal polyps. A combination of standard white-light colonoscopy for polyp detection and HRME for polyp classification has the potential to truly allow the endoscopist to selectively determine which lesions can be left in situ, which lesions can simply be discarded, and which lesions need formal histopathologic analysis.

An uncommon source of upper gastrointestinal bleeding: epiphrenic esophageal diverticulum.

Esophageal diverticula are rare findings that have an estimated incidence of 1 per 500 000 people per year, even though acute upper gastrointestinal bleeding is a relatively common medical emergency with an incidence of up to 150 per 100 000 people per year and a mortality rate of 7-14%. An 83-year-old man presented with hematemesis and melena. Urgent upper endoscopy revealed an esophageal diverticulum, within which was an adherent clot. Removal of the clot identified a bleeding vessel within the diverticulum; this was successfully clipped and hemostasis was achieved. To the best of our knowledge, this is the first case report of a bleeding epiphrenic esophageal diverticulum that was successfully managed endoscopically with hemostatic clips alone. While rare, our case serves as a reminder that bleeding epiphrenic esophageal diverticula can present as massive upper gastrointestinal bleeding and urgent endoscopic therapy can be life-saving.

Confocal laser endomicroscopy features of sessile serrated adenomas/polyps.

BACKGROUND AND AIMS: Sessile serrated adenomas/polyps (SSA/Ps) are difficult to differentiate from non-neoplastic tissue on white-light endoscopy. Confocal laser endomicroscopy (CLE) provides subcellular imaging and real-time "optical biopsy". The aim of this study was to prospectively describe CLE features of SSA/Ps. PATIENTS AND METHODS: Consecutive patients with SSA/Ps were prospectively evaluated with probe-based CLE imaging. CLE images and polyp histology were independently reviewed by three endoscopists and an expert gastrointestinal (GI) pathologist. Distinguishing CLE features of SSA/Ps were identified in conjunction with pathologic correlation. RESULTS: In total, 260 CLE images were generated from nine SSA/Ps evaluated in seven patients. Four consensus CLE features of SSA/P were identified: (1) a mucus cap with a bright, cloud-like appearance; (2) thin, branching crypts; (3) increased number of goblet cells and microvesicular mucin-containing cells; and (4) architectural disarray, with dystrophic goblet cells and lack of regular circular crypts. CONCLUSION: This is a novel description of characteristic CLE features of SSA/Ps. The four features we identified are easy to detect and may allow for CLE to serve as a diagnostic modality.

Digital chromoendoscopy utilization in clinical practice: A survey of gastroenterologists in Connecticut.

AIM: To use a survey to characterize and identify potential barriers to the use of digital chromoendoscopy (DC) by practicing gastroenterologists. METHODS: An anonymous, internet-based survey was sent to gastroenterologists in Connecticut who were members of one of three national gastrointestinal organizations. The survey collected demographic information, frequency of DC use, types of procedures that the respondent performs, setting of practice (academic vs community), years out of training, amount of training in DC, desire to have DC training and perceived barriers to DC use. Responses were collected anonymously. The primary endpoint was the proportion of endoscopists utilizing DC. Associations between the various data collected were analyzed using χ(2) test. RESULTS: One hundred and twenty-four gastroenterologists (48%) of 261 who received the online survey responded. Seventy-eight percent of surveyed gastroenterologists have used DC during the performance of upper endoscopy and 81% with lower endoscopy. DC was used in more than half of procedures by only 14% of gastroenterologists during upper endoscopy and 12% during lower endoscopy. Twenty-three percent (upper) and 21% (lower) used DC more than one quarter of the time. DC was used for 10% or less of endoscopies by 60% (upper) and 53% (lower) of respondents. Endoscopists reported lack of training as the leading deterrent to DC use with 36% reporting it as their primary deterrent. Eighty-nine percent of endoscopists never received formal training in DC. Lack of time (30% of respondents), lack of evidence (24%) and lack of reimbursement (10%) were additional deterrents. There were no differences in DC use relative to academic vs community practice setting or years out of training. CONCLUSION: DC is used infrequently by most endoscopists, primarily due to a lack of training. Training opportunities should be expanded to meet the interest expressed by the majority of endoscopists.