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End-tidal oxygraphy during pre-oxygenation in patients with severe diffuse emphysema.
E Samain1, E Farah, D Delefosse
1Service d'Anesthésie-Réanimation, Hôpital Beaujon, Assistance Publique-Hôpitaux de Paris, UFR Xavier Bichat, Université Paris VII, 100 Bvd Général Leclerc, 92118 Clichy Cedex, France.
Anaesthesia
|August 18, 2000
Summary
Pre-oxygenation with 100% oxygen is slower in patients with emphysema due to increased lung volume. Monitoring end-tidal oxygen concentration is crucial for adequate pre-oxygenation in these individuals.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
Background:
- Emphysema is characterized by increased lung volumes and airflow obstruction.
- Pre-oxygenation aims to increase oxygen reserves before apnea.
Purpose of the Study:
- To investigate if emphysema affects the rate of pre-oxygenation.
- To assess the correlation between lung mechanics and pre-oxygenation efficiency.
Main Methods:
- 10-minute pre-oxygenation with 100% oxygen was administered to 10 normal subjects and 10 severe emphysema patients.
- End-tidal oxygen concentration was monitored using a paramagnetic oxygen analyzer.
- Functional residual capacity and expiratory flow were measured.
Main Results:
- The increase in end-tidal oxygen concentration was significantly slower in the emphysema group compared to controls (p=0.0024).
- After 3 and 5 minutes, fractional oxygen concentration was lower in emphysema patients.
- End-tidal oxygen levels correlated negatively with functional residual capacity in emphysema patients.
Conclusions:
- Pre-oxygenation is less efficient in patients with severe diffuse emphysema.
- Monitoring end-tidal oxygen is recommended to ensure adequate pre-oxygenation in emphysema patients.