Chest
Special CommunicationBreathing Patterns: 2. Diseased Subjects
Section snippets
Subjects
The breathing pattern in the supine position was recorded utilizing the respiratory inductive plethysmograph in 47 young and 18 old normal subjects,2 22 cigarette smokers with little or no physiologic evidence of lung disease, 17 asymptomatic asthmatic patients, 15 symptomatic asthmatic patients, 28 patients with chronic obstructive pulmonary disease, 14 patients with restrictive lung disease, seven patients with primary pulmonary hypertension, and 13 patients with the chronic anxiety state (
Normal Subjects
As discussed in a previous article2 differences in age did not affect the mean values of the various breathing pattern components and these data were pooled for comparison with the disease categories (Table 1, 2).
Asymptomatic Smokers
The breathing pattern was monitored in smokers who had abstained from smoking at least three hours prior to testing. Compared to normal subjects, major differences in the breathing pattern were found in the 22 asymptomatic smokers who had little or no pulmonary dysfunction (Table 1).
Smokers
The pattern of breathing was markedly altered in our cigarette smokers who had little or no subjective complaints but often had evidence of small airways disease. VT, f, and min were increased while TI and TI/TTOT were reduced. Although all smokers had abstained from smoking for at least three hours before the study, the increased respiratory center drive as reflected by VT/TI might have been related to carryover effects of nicotine on peripheral chemoreceptors5 or respiratory center6
ACKNOWLEDGMENTS
The authors wish to thank Lee Rickies for preparation of the illustrations.
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Supported in part by National Heart, Lung and Blood Institute Grant HL-10622 ana a contract from Electric Power Research Institute RP-1373.