Optical Enhancement System ™ Plus Optical Magnification Utility in the Identification of Normal Gastric Mucosa, Helicobacter Pylori Associated Gastritis, and Gastric Atrophy

Detailed Summary

Endoscopy is a tool that has greatly influenced gastroenterological diagnosis. However, conventional endoscopy is limited to detecting lesions on the basis of gross morphological changes and therefore a certainly diagnosis depends on biopsy sampling of macroscopically obvious endoscopic features, or blind biopsy sampling of normal appearing mucosa with the risk of missed pathology and sampling errors. Gastric cancer is the second most common cause of cancer related death. One of the main roles of upper gastrointestinal endoscopy is to identify gastric cancer at an early stage. The importance of identifying H. pylori infection is because it plays a very important role in gastric carcinogenesis, progressing from chronic gastritis through atrophic gastritis, intestinal metaplasia, dysplasia and finally cancer. The importance of recognition a precancerous gastric lesion is because we can detect most tumors at an early stage and improve the survival. Most studies conclude that it is difficult to diagnose H. pylori related gastritis and gastric atrophy on the basis of endoscopic findings. Histology is therefore currently considered to be the gold standard for detecting H. pylori infection. The reliability of detecting H. pylori infection histologically depends on the site, number, and size of gastric biopsy specimens, as well as on expertise in staining and visualizing the bacteria. Considerable error also occurs in identifying gastric atrophy using blind biopsy sampling, and neither the original nor the revised version of the Sydney system reliably identifies more than half the cases in patients with confirmed gastric atrophy.

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