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- W2014614458 abstract "Steady state estimates of the pulmonary diffusing capacity for carbon monoxide (DLco) require measurement of the uptake and the average alveolar partial pressure of carbon monoxide (PACO). The expired alveolar sample obtained by different experimental methods and/ or breathing patterns rarely represents the actual PACO. It is widely accepted that nonuniform distribution of ventilation, diffusion and perfusion causes discrepancies in the measurement of diffusing capacity. An additional source of error in choosing PACO arises in the sampling time chosen by the experimental method. A theoretical study of a ramp-with-pause and a square breathing pattern demonstrates that the sample-time error exists even in the homogeneous lung. The study shows for the homogeneous lung that the correct fractional concentration of alveolar carbon monoxide ( FAV) occurs at a time ( TAV), one-half of a breathing period after the effective inspiration time ( TI) for the two very different breathing patterns. T, is well-defined in relation to any breathing pattern which can be approximated by ramps and pauses. If TAV and the sample time chosen by the experimental method are known, then the measured DLCO can be corrected to the actual diffusing capacity (DL). The theory agrees with experimental results and computer simulations of inhomogeneous lungs from the literature. This agreement suggests that the theory for the homogeneous lung is also relevant to the inhomogeneous lung." @default.
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- W2014614458 date "1977-04-07" @default.
- W2014614458 modified "2023-09-27" @default.
- W2014614458 title "TEMPORAL EFFECTS IN THE ESTIMATION OF PULMONARY DIFFUSING CAPACITY" @default.
- W2014614458 doi "https://doi.org/10.1113/expphysiol.1977.sp002382" @default.
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