Impact of a computer-based teaching module on characterization of diminutive colon polyps by using narrow-band imaging by non-experts in academic and community practice: a video-based study.

BACKGROUND: Experts can accurately characterize the histology of diminutive polyps with narrow-band imaging (NBI). There are limited data on the performance of non-experts. OBJECTIVE: To assess the impact of a computer-based teaching module on the accuracy of predicting polyp histology with NBI by non-experts (in academics and community practice) by using video clips. DESIGN: Prospective, observational study. SETTING: Academic and community practice. PARTICIPANTS: A total of 15 gastroenterologists participated-5 experts in NBI, 5 non-experts in academic practice, and 5 non-experts in community practice. INTERVENTION: Participants reviewed a 20-minute, computer-based teaching module outlining the different NBI features for hyperplastic and adenomatous polyps. MAIN OUTCOME MEASUREMENTS: Performance characteristics in characterizing the histology of diminutive polyps with NBI by using short video clips before (pretest) and after (posttest) reviewing the teaching module. RESULTS: Non-experts in academic practice showed a significant improvement in the sensitivity (54% vs 79%; P < .001), accuracy (64% vs 81%; P < .001), and proportion of high-confidence diagnoses (49% vs 69%; P < .001) in the posttest. Non-experts in community practice had significantly higher sensitivity (58% vs 75%; P = .004), specificity (76% vs 90%; P = .04), accuracy (64% vs 81%; P < .001), and proportion of high-confidence diagnoses (49% vs 72%; P < .001) in the posttest. Performance of experts in NBI was significantly better than non-experts in both academic and community practice. LIMITATIONS: Selection bias in selecting good quality videos. Performance not assessed during live colonoscopy. CONCLUSION: Academic and community gastroenterologists without prior experience in NBI can achieve significant improvements in characterizing diminutive polyp histology after a brief computer-based training. The durability of these results and applicability in everyday practice are uncertain.

The utility of lower endoscopic ultrasound-guided fine needle aspiration for the diagnosis of benign and malignant pelvic diseases.

BACKGROUND: The utility of endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) for the diagnosis of pelvic masses has been suggested but limited data are available in the literature regarding its diagnostic accuracy. GOALS: To report our institutional experience with EUS-FNA for the diagnosis of a variety of pelvic diseases. METHODS: Patients who were referred for the evaluation of pelvic lesions using lower EUS-FNA were included in this retrospective analysis if they had available surgical pathology (obtained after EUS) which was considered the gold standard against which the EUS-FNA findings would have been compared. The diagnostic accuracy of EUS-FNA for pelvic masses was analyzed and any early or late complications after the procedure were reported. A pelvic mass was defined in the study as any mass seen with an imaging modality in the pelvic area including those involving the colonic wall. RESULTS: Twenty patients had EUS-FNA followed by surgery for whom FNA cytology and surgical pathology findings were available. EUS-FNA reached the correct diagnosis in 19 out of 20 patients, whereas for the missing 1 malignant lymph node wherein FNA revealed benign cytology, surgical specimen confirmed metastatic colon cancer. The sensitivity and specificity of EUS-FNA were 90% and 100%, respectively, with positive and negative predictive values of 100% and 90%, respectively. No early or late complications were encountered with this procedure for the sampling of cystic and noncystic masses. CONCLUSIONS: EUS-FNA has excellent diagnostic accuracy for pelvic masses. It represents a safe procedure with excellent yield and thus may be used as a first line modality for the evaluation and diagnosis of pelvic masses within its reach.

Significant increase of esophageal mucin secretion in patients with reflux esophagitis after healing with rabeprazole: its esophagoprotective potential.

Esophageal mucin secretion in patients with reflux esophagitis (RE) is significantly impaired. Rabeprazole augments gastric mucin secretion. We have studied, therefore, the effect of rabeprazole on esophageal mucin secretion in patients with RE. The study was conducted in 15 patients with RE treated with rabeprazole (20 mg QD) for 8 weeks. Esophageal secretions were collected during consecutive infusions of initial NaCl, HCl/Pepsin (HCl/P), and a final NaCl, using a specially designed esophageal catheter, before and after therapy. Mucin was measured using standard methodology. After rabeprazole administration esophageal mucin concentration as well as secretion increased during perfusion with initial saline (P < 0.01), HCl/P (P < 0.02), and concluding saline (P < 0.001). Stimulation of esophageal mucin secretion by rabeprazole may indicate that the mechanisms governing its secretion are similar to those implicated in gastric mucin output. Enhancement of esophageal mucin secretion by rabeprazole may translate into esophagoprotective potential in patients with reflux esophagitis.

High-resolution chromoendoscopy in the esophagus.

The major role for chromoendoscopy in the esophagus is the identification of premalignant or early cancerous lesions. In combination with high-resolution or magnification endoscopes, chromoendoscopy can potentially increase the diagnostic yield of clinically relevant lesions. Preliminary data have indicated a good correlation of findings using this technique to histopathologic readings. The ultimate goal of chromoendoscopy in combination with high resolution/magnification endoscopy is the determination of histology without obtaining tissue samples. In this article we review the different stains, the technical aspects, and current data in esophageal chromoendoscopy. We summarize possible clinical applications of these techniques and future directions of their use in esophageal diseases.