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Physical chemical and technical limitations to intragastric titration
Gastroenterology
|May 1, 1979
Summary
Intragastric titration can accurately measure gastric secretion within a specific pH range (4.0-4.5). Errors increase significantly at lower or higher pH levels, especially when using sodium bicarbonate as a titrant.
Area of Science:
- Gastroenterology
- Physiological measurement
Background:
- Intragastric titration, established in 1973, is increasingly utilized for studying gastric secretion.
- Both sodium bicarbonate (NaHCO3) and sodium hydroxide (NaOH) are common titrants.
Purpose of the Study:
- To evaluate the physical, chemical, and technical limitations of intragastric titration.
- To determine the optimal conditions for accurate gastric secretion measurements.
Main Methods:
- Analysis of error margins associated with varying endpoint pH levels.
- Assessment of limitations imposed by CO2 accumulation when using NaHCO3.
- Consideration of volume expansion effects at low endpoint pH.
Main Results:
- Significant errors occur at low endpoint pH (<1.11), increasing exponentially with decreasing pH.
- Using NaHCO3 can lead to up to 20% errors at pH 5.5 due to CO2 retention.
- High endpoint pH values, particularly above the pKa' of carbonic acid, can generate artifactitious acid secretion.
Conclusions:
- Intragastric titration is a potentially quantitative method for gastric secretion studies within the 4.0--4.5 endpoint pH range.
- In vivo validation is crucial for each specific experimental setup.
- Careful consideration of titrant, endpoint pH, and CO2 management is necessary for accurate results.
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