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Colonization of the gastric contents in critically ill patients
Abstract:
In a study of 28 ventilated patients in the ICU, cimetidine was ineffective in maintaining gastric pH above 4. Quantitative and qualitative bacteriological examination of daily gastric aspirates showed that when the pH was above 4, there was rapid colonization with high counts of organisms, predominantly coliforms. Progressive colonization by yeasts, independent of pH, was noted in nearly one-half of the patients. Gastric colonization has possible implications in terms of crossinfection of development of aspiration pneumonia. As these are seriously ill patients with compromised gastrointestinal (GI) barriers and decreased immunity, the large numbers of bacteria or their endotoxins may contribute to the high incidence of septicemia.
Insights
Cimetidine failed to keep gastric pH above 4 in ventilated ICU patients. Higher gastric pH led to rapid bacterial colonization, increasing risks of infection and septicemia in critically ill individuals.
Area of Science:
- Critical Care Medicine
- Gastroenterology
- Infectious Diseases
Background:
- Critically ill patients in intensive care units (ICUs) often require gastric acid suppressants.
- Maintaining gastric pH is crucial for preventing stress-related mucosal damage.
- The impact of gastric pH on bacterial colonization in ventilated patients is a significant concern.
Purpose of the Study:
- To evaluate the efficacy of cimetidine in maintaining gastric pH above 4 in mechanically ventilated ICU patients.
- To investigate the relationship between gastric pH and bacterial colonization in the upper gastrointestinal tract.
- To assess the implications of gastric colonization on patient outcomes, including infection and septicemia.
Main Methods:
- A study involving 28 ventilated patients in the ICU.
- Daily monitoring of gastric aspirates for quantitative and qualitative bacteriological examination.
- Measurement of gastric pH levels.
Main Results:
- Cimetidine was ineffective in maintaining gastric pH above 4.
- Gastric pH above 4 correlated with rapid colonization by high counts of bacteria, primarily coliforms.
- Yeast colonization occurred in nearly half of the patients, irrespective of gastric pH.
- Significant bacterial and yeast colonization were observed in gastric aspirates.
Conclusions:
- Cimetidine is not effective for maintaining gastric pH above 4 in this patient population.
- Elevated gastric pH promotes significant bacterial and yeast colonization, posing risks.
- Gastric colonization may contribute to cross-infection, aspiration pneumonia, and septicemia in critically ill patients.