Gastric mucosal defences in the elderly.
BACKGROUND
Elderly subjects are more prone to develop gastric injury, but human data on the state of mucosal protective mechanisms are scarce. The aim of the study was to assess gastric mucus and bicarbonate secretion as well as local microcirculation in elderly patients.


METHODS
Fasting gastric juice was collected in 45 elderly patients and in 45 control subjects devoid of endoscopic gastric abnormalities. Total mucoproteins, 'mucoprotective index' (as qualitative expression of mucus secretion) and gastric bicarbonate (Feldman's method) were measured. In addition in 24 elderly patients, and in a matching group of younger subjects, gastric mucosal blood flow was measured by laser Doppler flowmetry.


RESULTS
Mucus and bicarbonate production was significantly reduced (p < 0.01) in elderly patients, the quality of mucus secretion being unaltered. Gastric mucosal perfusion was also significantly decreased (p < 0. 01) in aged subjects.


CONCLUSIONS
In the elderly gastric mucosal defences are impaired. This is in keeping with a reduced gastric prostaglandin biosynthesis and may account for the higher susceptibility of the mucosa to damaging agents. The possible role of atrophic gastritis and Helicobacter pylori infection as independent confounding factors remains to be determined.
Gastroenterology Unit, S. Raffaele Hospital, University of Milan, Italy. guslandi.mario@hsr.it
M
M
Guslandi
A
A
Pellegrini
M
M
Sorghi
D000328:Adult; D000368:Aged; D000375:Aging / Q000378:metabolism*; D001639:Bicarbonates / Q000378:metabolism; D005260:Female; D005753:Gastric Mucosa / Q000098:blood supply / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009088:Mucoproteins / Q000378:metabolism; D009093:Mucus / Q000502:physiology
D001639:Bicarbonates; D009088:Mucoproteins