Gastric metaplasia of the duodenum: identification by an endoscopic selective mucosal staining technique.
BACKGROUND
To understand the pathophysiology of duodenal ulcer disease, it is important to identify and quantitate gastric metaplasia of the duodenum. Methylene blue dye is absorbed well by intestinal mucosa, but not by gastric mucosa. Our aim was to validate a methylene blue staining technique for measurement of gastric metaplasia in the duodenum.


METHODS
Eight subjects with chronic duodenal ulcer disease and seven subjects with other upper intestinal disorders underwent duodenal methylene blue staining after application of a mucolytic agent. Biopsy specimens were obtained from blue-stained and pale unstained areas and assessed for gastric metaplasia histologically.


RESULTS
Pink or pale unstained duodenal areas had more gastric surface cell metaplasia than blue-stained areas. Unstained duodenum was also more likely to have extensive (more than 25% of the biopsy specimens) gastric metaplasia (60%) than blue-stained areas (9%). Subjects with duodenal ulcer disease had more unstained mucosa than controls.


CONCLUSIONS
Methylene blue staining of the duodenum is useful to identify and quantitate gastric metaplasia.
Mertz
H
H
Vanderbilt University Department of Medicine, CURE Gastroenteric Biology Center, Nashville, TN 37232, USA.
Kovacs
T
T
Thronson
M
M
Weinstein
W
W
D000368:Aged; D001706:Biopsy; D004381:Duodenal Ulcer / Q000382:microbiology / Q000473:pathology*; D004386:Duodenum / Q000382:microbiology / Q000473:pathology*; D004724:Endoscopy / Q000379:methods*; D016480:Helicobacter pylori / Q000302:isolation & purification; D006801:Humans; D007413:Intestinal Mucosa / Q000382:microbiology / Q000473:pathology*; D008297:Male; D008679:Metaplasia / Q000175:diagnosis* / Q000382:microbiology / Q000473:pathology; D008751:Methylene Blue; D008875:Middle Aged; D013194:Staining and Labeling / Q000379:methods*
D008751:Methylene Blue