Power spectral density of breathing pattern in patients with chronic obstructive lung disease.
Newsom Davis and Stagg studying the interrelationship of the volume and time components of individual breaths in healthy resting man described a significant correlation between mean tidal volume (VT) and inspiratory time (TI) r = 0.704. The correlation between mean TI and expiratory time (TE) was lower, r = 0.381. Evaluation of these relationships and of the power spectral density of the breathing pattern was the aim of the present study. For breath by breath analysis we calculated power spectral density and cross correlations of VT, TI and TE. We found a significant correlation between VT and TI in 9 patients with global respiratory insufficiency (RI) (mean r = 0.52) and 7 patients with partial RI (mean r = 0.56). The correlation between TI, TE was lower, in 9 patients with global RI (mean r = 0.21) and 7 patients with partial RI (mean r = 0.35). The results of both groups did not differ from healthy subjects in power spectral density of the breathing pattern and in correlations of VT and TI as well as TI and TE.
IIIrd Department of Medicine, Faculty of Medicine, University J.E. Purkyne, Brno, Czechoslovakia.
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J
Siegelová
J
J
Kopecny
D006801:Humans; D008173:Lung Diseases, Obstructive / Q000097:blood / Q000503:physiopathology*; D008176:Lung Volume Measurements; D010100:Oxygen / Q000097:blood*; D012119:Respiration; D013990:Tidal Volume
D010100:Oxygen