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Normal values for respiratory resistance using forced oscillation in subjects>65 years old
Y F Guo1, F Herrmann, J-P Michel
1Department of Rehabilitation and Geriatrics, Geneva University Hospital, Switzerland.
The European Respiratory Journal
|October 6, 2005
Summary
This study determined reference values for respiratory impedance using the forced oscillation technique in older adults. Height emerged as the best predictor for respiratory impedance parameters, though overall predictability remained low.
Area of Science:
- Respiratory Physiology
- Pulmonary Function Testing
Background:
- The forced oscillation technique (FOT) is used to measure respiratory impedance (Zrs).
- Establishing reference values for Zrs in older adults is crucial for clinical interpretation.
- Predictive factors for Zrs in this demographic require further investigation.
Purpose of the Study:
- To determine reference values for respiratory impedance parameters measured by FOT in individuals over 65 years.
- To identify predictive variables for respiratory impedance in this age group.
Main Methods:
- A prospective study involving 223 non-smoking subjects aged over 65 with normal spirometry.
- Respiratory impedance parameters (R4-16, RM, FN, I, C) were measured using FOT.
- Spirometry (FEV1, FVC) was performed concurrently.
Main Results:
- Mean age of subjects was 83±8 years.
- Mean FEV1% predicted was 110±23, FVC% predicted was 114±21, and FEV1/FVC% predicted was 112±11.
- Height was identified as the most influential predictor for Zrs parameters, while age and weight had negligible contributions. Predictability by regression equations was low.
Conclusions:
- Height is the primary predictor of respiratory impedance parameters in older adults.
- The predictive power of regression equations for Zrs in this population is limited.
- Further research may be needed to enhance the predictability of Zrs parameters in elderly individuals.