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Chest, Vol 90, 58-63, Copyright © 1986 by American College of Chest Physicians

ARTICLES

Intragastric pH profile during acute respiratory failure in patients with chronic obstructive pulmonary disease. Effect of ranitidine and enteral feeding

D Rigaud, J Chastre, JP Accary, S Bonfils, C Gibert and AJ Hance

The ability of H2 receptor antagonists and continuous enteral alimentation to maintain high intragastric pH in patients with chronic obstructive pulmonary disease (COPD) requiring mechanical ventilation was evaluated by continuously monitoring intragastric pH prior to and following sequential addition of ranitidine or continuous enteral alimentation (or both) to their therapeutic regimen. Prior to therapy, intragastric pH was less than 4.0 for 75 +/- 10 percent of the time, but never less than 1.0. Nevertheless, this moderate gastric acidity was associated with evidence of mucosal injury. Ranitidine failed to continuously maintain a high intragastric pH (pH less than 4.0 for 35 +/- 11 percent of the time; p greater than 0.2 compared to patients treated with placebo). Following administration of continuous enteral alimentation, intragastric pH fell, and ranitidine therapy only partially blocked this increase in gastric acidity induced by continuous enteral alimentation. We conclude that without treatment, patients with COPD who have acute respiratory failure may develop gastric mucosal injury despite the presence of only moderate intragastric acidity; however, ranitidine and continuous enteral alimentation are not effective in maintaining a high intragastric pH.


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Copyright © 1986 by the American College of Chest Physicians.