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Esophageal elastance in anesthetized humans.
Summary
Esophageal elastance (Ees) in humans was measured across different postures and anesthesia states. Findings show minor variations in Ees, indicating minimal impact on lung mechanics.
Area of Science:
- Physiology
- Respiratory Mechanics
Background:
- Esophageal elastance (Ees) is a key indicator of respiratory system mechanics.
- Understanding factors influencing Ees is crucial for respiratory assessment.
Purpose of the Study:
- To investigate the effects of posture and anesthesia on esophageal elastance in humans.
- To determine the influence of lung volume on Ees under various conditions.
Main Methods:
- Measurements of static esophageal pressure using a balloon catheter.
- Assessment of respiratory volumes via pneumotachography.
- Determination of functional residual capacity (FRC) using body plethysmography.
Main Results:
- In supine awake subjects, Ees at FRC was 3 cmH2O/ml and increased with lung volume.
- Anesthesia did not alter Ees at FRC but abolished lung volume dependence.
- In the left lateral position, Ees was similar to supine awake subjects, with minimal lung volume influence, but decreased with anesthesia.
Conclusions:
- Posture and anesthesia cause small variations in esophageal elastance.
- These variations have a minor impact on the overall shape of the lung's pressure-volume curve.