Comparative effectiveness of i-SCAN™ and high-definition white light characterizing small colonic polyps.

AIM: To evaluate accuracy of in vivo diagnosis of adenomatous vs non-adenomatous polyps using i-SCAN digital chromoendoscopy compared with high-definition white light. METHODS: This is a single-center comparative effectiveness pilot study. Polyps (n = 103) from 75 average-risk adult outpatients undergoing screening or surveillance colonoscopy between December 1, 2010 and April 1, 2011 were evaluated by two participating endoscopists in an academic outpatient endoscopy center. Polyps were evaluated both with high-definition white light and with i-SCAN to make an in vivo prediction of adenomatous vs non-adenomatous pathology. We determined diagnostic characteristics of i-SCAN and high-definition white light, including sensitivity, specificity, and accuracy, with regards to identifying adenomatous vs non-adenomatous polyps. Histopathologic diagnosis was the gold standard comparison. RESULTS: One hundred and three small polyps, detected from forty-three patients, were included in the analysis. The average size of the polyps evaluated in the analysis was 3.7 mm (SD 1.3 mm, range 2 mm to 8 mm). Formal histopathology revealed that 54/103 (52.4%) were adenomas, 26/103 (25.2%) were hyperplastic, and 23/103 (22.3%) were other diagnoses include "lymphoid aggregates", "non-specific colitis," and "no pathologic diagnosis." Overall, the combined accuracy of endoscopists for predicting adenomas was identical between i-SCAN (71.8%, 95%CI: 62.1%-80.3%) and high-definition white light (71.8%, 95%CI: 62.1%-80.3%). However, the accuracy of each endoscopist differed substantially, where endoscopist A demonstrated 63.0% overall accuracy (95%CI: 50.9%-74.0%) as compared with endoscopist B demonstrating 93.3% overall accuracy (95%CI: 77.9%-99.2%), irrespective of imaging modality. Neither endoscopist demonstrated a significant learning effect with i-SCAN during the study. Though endoscopist A increased accuracy using i-SCAN from 59% (95%CI: 42.1%-74.4%) in the first half to 67.6% (95%CI: 49.5%-82.6%) in the second half, and endoscopist B decreased accuracy using i-SCAN from 100% (95%CI: 80.5%-100.0%) in the first half to 84.6% (95%CI: 54.6%-98.1%) in the second half, neither of these differences were statistically significant. CONCLUSION: i-SCAN and high-definition white light had similar efficacy predicting polyp histology. Endoscopist training likely plays a critical role in diagnostic test characteristics and deserves further study.

Laparoscopic surgical treatment for refractory gastric antral vascular ectasia: a case report and review.

Gastric antral vascular ectasia (GAVE) is an angiodysplastic disorder of unclear etiology and rare cause of upper gastrointestinal bleeding. Endoscopic findings of hyperemic antral folds with dilated, tortuous vessels extending radially from the pylorus are diagnostic. Ectatic submucosal capillaries, microvascular fibrin thrombosis, and fibromuscular hyperplasia in the lamina propria are distinctive histologic features. Diverse treatment options are available, ranging from conservative medical or endoscopic therapy to surgical resection of affected gastric region. Surgery is the only known curative treatment and is traditionally pursued after failure of conservative therapy, as high postoperative mortality has been reported. A case of refractory GAVE in a 71-year-old female patient after 5 years of conservative management, is presented. The patient underwent successful laparoscopic distal gastrectomy and gastrojejunostomy with resolution of symptomatic anemia and melena. Clinical findings, diagnosis, etiology, and treatment of GAVE are reviewed here, with discussion of safety and efficacy of laparoscopic gastric resection for its treatment.

Childhood gastroesophageal reflux symptoms in adult patients.

OBJECTIVES: Gastroesophageal reflux (GER) and its esophageal (esophagitis, Barrett's esophagus) and extraesophageal (asthma, laryngeal disease) disease manifestations (GERD) are increasing common problems in children and adults. There are virtually no published longitudinal outcome studies that describe the natural history of childhood-onset GER throughout a person's lifetime. The aim of this study was to compare the frequency of recalled childhood reflux symptoms in adult patients currently with and without GER symptoms. METHODS: Four hundred adult patients were classified as refluxers (225 patients; 57%), nonrefluxers (154 patients; 38%), and those who claimed to not know if they had reflux (21 patients; 5%; excluded from analysis). Subjects were given a questionnaire asking them to recall childhood symptoms attributed to GER. Of the 225 refluxers, 141 (63%) recalled at least one childhood symptom, compared with 54 of the 154 nonrefluxers (35%) ( < 0.001). CONCLUSIONS: Adult refluxers were more likely to recall having developed GER symptoms at an earlier age, beginning at infancy and developing statistically significant GER compared with nonrefluxers after age 11. Adults suffering from GER were far more likely than nonrefluxers to recall having experienced GER symptoms during childhood. Well-designed, population-based epidemiologic studies are needed to more accurately assess the extent of GER in the overall population and the extent of its impact on health care in the United States.