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Diffusing capacity in idiopathic scoliosis and its interpretation regarding alveolar development
The American Review of Respiratory Disease
|August 1, 1982
Summary
Idiopathic scoliosis in adults reduces lung volumes and diffusing capacity (DL). However, lung function is normal when adjusted for smaller lung volumes, indicating a delay in lung development due to thoracic deformity.
Area of Science:
- Pulmonary Medicine
- Orthopedics
- Pediatric Pulmonology
Background:
- Idiopathic scoliosis is a spinal deformity that can affect thoracic structure.
- Reduced lung volumes are often observed in patients with scoliosis.
Purpose of the Study:
- To investigate lung volumes and diffusing capacity in subjects with idiopathic scoliosis.
- To determine if lung function abnormalities in scoliosis are due to intrinsic lung disease or reduced lung volumes.
Main Methods:
- Measured lung volumes, diffusing capacity (DL), membrane permeability (DM), and capillary blood volume (Vc) using the single breath method.
- Compared 22 subjects with idiopathic scoliosis (mean curvature 66 degrees) to an age-matched control group.
Main Results:
- Subjects with scoliosis had significantly lower vital capacity, total lung capacity, and functional residual capacity.
- Diffusing capacity (DL) was also lower, but specific DL (DLVA) was normal, indicating normal alveolar-capillary function relative to lung size.
- Lung function parameters (DM, Vc) showed similar relationships with alveolar volume (VA) in both groups, with a wider scatter in the scoliosis group.
Conclusions:
- Lung function, including DL, DM, and Vc, is normal in idiopathic scoliosis when adjusted for reduced lung volumes.
- The findings suggest a delay in lung development secondary to thoracic deformity, rather than alveolar atrophy.
- Scoliosis leads to a delay in lung development, with alveolar characteristics in adolescents resembling those of younger children.