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Human middle ear gas composition studied by mass spectrometry
1Department of Audiology, University Hospital, Linköping, Sweden.
Acta Oto-Laryngologica
|July 1, 1990
Summary
This study developed a precise mass spectrometry method to measure middle ear gas composition in healthy adults. The novel technique ensures accurate analysis of oxygen, nitrogen, argon, and carbon dioxide partial pressures.
Area of Science:
- Otolaryngology
- Analytical Chemistry
- Physiology
Background:
- Accurate measurement of middle ear gas composition is crucial for understanding ear physiology and disease.
- Existing methods may be prone to atmospheric air contamination, affecting results.
Purpose of the Study:
- To develop and validate a mass spectrometric procedure for analyzing human middle ear gas composition.
- To determine the partial pressures of gases (oxygen, nitrogen, argon, carbon dioxide) in healthy adult middle ears.
Main Methods:
- Utilized "on-line" sampling directly from the middle ear to the mass spectrometer to prevent atmospheric admixture.
- Implemented a novel protective technique at the puncture site and modified the inlet system for low gas consumption.
- Validated the procedure's accuracy and linearity through model experiments.
Main Results:
- Achieved excellent linearity and high accuracy in gas analysis.
- Measured partial pressures in healthy adult middle ears: pO2 = 612.38 ± 3.97 mmHg, pN2 = 40.85 ± 3.68 mmHg, pAr = 7.09 ± 0.08 mmHg, pCO2 = 52.69 ± 5.54 mmHg.
Conclusions:
- The developed mass spectrometry method provides an accurate and reliable means to analyze middle ear gas composition.
- Established baseline gas partial pressure values for healthy adult human middle ears.