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Reappraisal of DLCO adjustment to interpret the adaptive response of the air-blood barrier to hypoxia.

Abstract：

:DLCO measured in hypoxia must be corrected due to the higher affinity (increase in coefficient θ) of CO with Hb. We propose an adjustment accounting for individual changes in the equation relating DLCO to subcomponents Dm (membrane diffusive capacity) and Vc (lung capillary volume): 1/DLCO=1/Dm+1/θVc. We adjusted the individual DLCO measured in hypoxia (HA, 3269m) by interpolating the 1/DLCO to the sea level (SL) 1/θ value. Nineteen healthy subjects were studied at SL and HA. Based on the proposed adjustment, DLCO increased in HA in 53% of subjects, reflecting the increase in Dm that largely overruled the decrease in Vc. We hypothesize that a decrease in Vc (buffering microvascular filtration) and the increase in Dm (possibly resulting from a decrease in thickness of the air-blood barrier) represent the anti-edemagenic adaptation of the lung to hypoxia exposure. The efficiency of this adaptation varied among subjects as DLCO did not change in 31% of subjects and decreased in 16%.

journal_name

Respir Physiol Neurobiol

journal_title

Respiratory physiology & neurobiology

authors

Beretta E,Lanfranconi F,Grasso GS,Bartesaghi M,Alemayehu HK,Miserocchi G

doi

10.1016/j.resp.2016.08.009

subject

Has Abstract

pub_date

2017-04-01 00:00:00

pages

59-65

eissn

1569-9048

issn

1878-1519

pii

S1569-9048(16)30154-9

journal_volume

238

pub_type

杂志文章

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