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Spirometry and chest wall dimensions in achondroplasia.
D C Stokes1, R E Pyeritz, R A Wise
1Department of Pediatrics, Johns Hopkins Medical Institutions, Baltimore, MD.
Chest
|February 1, 1988
Summary
Pulmonary function values for individuals with achondroplasia are now available. This study found that achondroplasia patients have reduced vital capacity compared to predictions for normally proportioned individuals.
Area of Science:
- Pulmonary Medicine
- Genetics
- Pediatrics
Background:
- Standard pulmonary function values are lacking for individuals with short-limbed dwarfism.
- Achondroplasia is the most common form of dwarfism, characterized by significantly reduced stature.
Purpose of the Study:
- To establish standard pulmonary function values for individuals with achondroplasia.
- To develop prediction equations for pulmonary function based on anthropometric measurements in achondroplasia.
Main Methods:
- Measured chest diameters and performed expiratory spirograms on 102 subjects (58 female, 44 male) with achondroplasia.
- Derived prediction equations for forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and forced expiratory flow between 25% and 75% of FVC (FEF25-75%).
- Compared observed FVC to predicted values for normally proportioned individuals.
Main Results:
- Adult standing height was significantly shorter, with a higher sitting/standing height ratio than normal.
- AP chest diameters were smaller than controls only in males.
- Observed vital capacity was 67.6% (females) and 72.4% (males) of predicted values for normally proportioned individuals.
Conclusions:
- Achondroplasia is associated with reduced vital capacity, likely due to chest wall mechanics or abnormal lung growth.
- Developed novel prediction equations for pulmonary function in achondroplasia.
- Highlights the need for tailored pulmonary assessments in individuals with achondroplasia.