EFFECT OF BODY POSITION ON CARBON-MONOXIDE DIFFUSING-CAPACITY IN ASYMPTOMATIC SMOKERS AND NON-SMOKERS

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Abstract
CO diffusion capacity (DLCO) was measured in the sitting and supine position in 73 apparently normal subjects (41 nonsmokers and 32 smokers). The coefficient of DLCO standardized for alveolar volume (KCO) was less in the smokers than in the nonsmokers (P < 0.05) in the sitting position, but the separation was wider in the supine posture (P < 0.01). The per cent changes between supine and sitting KCO (.DELTA.KCO) were age dependent in both nonsmokers and smokers, but this age dependence was more accentuated in the latter group. Only 3 smokers were below the 95% confidence limit of nonsmokers for KCO in the sitting position, but there were 7 smokers below that limit for .DELTA.KCO. An attempt was made, using i.v. injection of 133 Xe, to study the mechanism of this impairment. Persons who failed to increase KCO in the supine posture showed an ability to increase apical blood flow in that position. The mechanisms of impairment in .DELTA.KCO remain to be explained and may be due either to a predominant apical defect or to a widespread abnormality of the pulmonary capillary bed.