The utility of the forced oscillation technique in assessing bronchodilator responsiveness in patients with asthma.
OBJECTIVE
To address the utility of the forced oscillation technique (FOT) in assessing bronchodilator responsiveness compared with forced expiratory volume in 1s (FEV(1)).


METHODS
This is a retrospective analysis of consecutive 126 patients with a clinical history of asthma without any other lung diseases at a pulmonary function testing laboratory. The following measurements were obtained three times each, before and after two doses of pirbuterol 0.2mg inhalation: the respiratory resistance at 5Hz (Rrs5), the mean respiratory resistance between 5 and 20Hz (Rrs5-20), and the mean respiratory conductance (Grs5-20) by FOT and the FEV(1) by spirometer. These measurements were transformed into dimensionless subject-specific effect-size "d-scores" by dividing them by the estimated pooled within-subject standard deviation.


RESULTS
Descriptive statistics for each value were the following [mean baseline value (+/-sd), Delta value (pre- minus post value), and d-score (P value compared to FEV(1))]: Grs5-20 (Ls(-1)kPa(-1)) [1.79+/-0.53, Delta=+0.39, d=2.64 (P<0.001)], Rrs5-20 (kPaL(-1)s) [0.60+/-0.16L, Delta=-0.10, d=2.56 (P=0.001)], Rrs5 (kPaL(-1)s) [0.78+/-0.25, Delta=-0.16, d=2.52 (P<0.001)], and FEV(1) (L) [1.90+/-0.64, Delta=-0.20, d=1.83]. The higher d-score of Grs5-20, Rrs5-20 and Rrs5 compared to FEV(1) indicates that these are better indicators for bronchodilator response than FEV(1). The percentages of subjects exhibiting change in the expected direction after bronchodilator were not significantly different between each value: Rrs5 (85.7%), Rrs5-20 (83.3%), Grs5-20 (83.3%), and FEV(1) (83.3%) [P>0.05].


CONCLUSIONS
Several forced oscillation measures, namely Grs5-20, Rrs5-20 and Rrs5, are more accurate and sensitive for detecting bronchodilator response than FEV(1) in patients with asthma.
Yaegashi
Makito
M
University of Pittsburgh Medical Center, Pittsburgh, PA, USA. myaegashi@hotmail.com
Yalamanchili
Venkata A K
VA
Kaza
Vaidehi
V
Weedon
Jeremy
J
Heurich
Albert E
AE
Akerman
Michael J
MJ
D000328:Adult; D000403:Airway Resistance; D000886:Anthropometry; D001249:Asthma / Q000188:drug therapy* / Q000503:physiopathology; D001993:Bronchodilator Agents / Q000627:therapeutic use*; D004983:Ethanolamines / Q000627:therapeutic use; D005260:Female; D005541:Forced Expiratory Volume / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D009991:Oscillometry / Q000379:methods; D012129:Respiratory Function Tests / Q000379:methods; D012189:Retrospective Studies; D016896:Treatment Outcome
D001993:Bronchodilator Agents; D004983:Ethanolamines; C009118:pirbuterol