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Thoracoabdominal restriction in supine men: CT and lung function measurements
L Tokics1, G Hedenstierna, B Brismar
1Department of Anesthesiology, Huddinge University Hospital, Sweden.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 1988
Summary
Thoracoabdominal restriction in healthy supine volunteers reduced lung volumes but did not cause lung tissue changes or affect gas exchange. This differs from anesthetized subjects, indicating healthy lungs adapt to reduced functional residual capacity (FRC).
Area of Science:
- Respiratory Physiology
- Pulmonary Mechanics
Background:
- Thoracoabdominal restriction can alter lung volumes and potentially lung tissue.
- Understanding these effects in healthy individuals is crucial for comparative physiology.
Purpose of the Study:
- To investigate the effects of thoracoabdominal restriction on thoracic dimensions, lung function, and lung tissue in supine healthy volunteers.
- To compare findings with those in anesthetized supine subjects.
Main Methods:
- Healthy volunteers wore a corset for thoracoabdominal restriction.
- Measurements included computerized tomography (CT), lung function tests (helium equilibration, N2 washout), static pressure-lung volume curves, and gas exchange analysis (multiple inert gas elimination technique, arterial blood gases).
Main Results:
- Restriction significantly reduced total lung capacity, functional residual capacity (FRC), and vital capacity.
- Diaphragm moved cranially, and thoracic cross-sectional area decreased; however, CT scans showed no lung tissue changes (atelectasis).
- Gas exchange remained unaffected, and the static pressure-lung volume curve shifted without a change in slope.
Conclusions:
- In supine healthy subjects, thoracoabdominal restriction reducing FRC does not lead to atelectasis.
- Healthy lungs adapt to reduced FRC without compromising gas exchange or causing tissue damage, unlike in anesthetized states.