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- W2034348612 abstract "Airway lengthening after pneumonectomy (PNX) may increase diffusive resistance to gas mixing (1/D(G)); the effect is accentuated by increasing acinar gas density but is difficult to detect from lung CO-diffusing capacity (Dl(CO)). Because lung NO-diffusing capacity (Dl(NO)) is three- to fivefold that of Dl(CO), whereas 1/D(G) for NO and CO are similar, we hypothesized that a density-dependent fractional reduction would be greater for Dl(NO) than for Dl(CO). We measured Dl(NO) and Dl(CO) at two tidal volumes (Vt) and with three background gases [helium (He), nitrogen (N(2)), and sulfur hexafluoride (SF(6))] in immature dogs 3 and 9 mo after right PNX (5 and 11 mo of age). At maturity (11 mo), background gas density had no effect on Dl(NO), Dl(CO), or Dl(NO)-to-Dl(CO) ratio in sham controls. In PNX animals, Dl(NO) declined 25-50% in SF(6) relative to He and N(2), and Dl(NO)/Dl(CO) declined approximately 50% in SF(6) relative to He at a Vt of 15 ml/kg, consistent with a significant 1/D(G). At 5 mo of age, Dl(NO)/Dl(CO) declined 25-45% in SF(6) relative to He and N(2) in both groups, but Dl(CO) increased paradoxically in SF(6) relative to N(2) or He by 20-60%. Findings suggest that SF(6), besides increasing 1/D(G), may redistribute ventilation and/or enhance acinar penetration of the convective front." @default.
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- W2034348612 date "2003-05-01" @default.
- W2034348612 modified "2023-09-23" @default.
- W2034348612 title "Density-dependent reduction of nitric oxide diffusing capacity after pneumonectomy" @default.
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- W2034348612 doi "https://doi.org/10.1152/japplphysiol.00525.2002" @default.
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