Nitric oxide production and absorption in trachea, bronchi, bronchioles, and respiratory bronchioles of humans

被引:32
作者
DuBois, AB
Kelley, PM
Douglas, JS
Mohsenin, V
机构
[1] John B Pierce Fdn Lab, New Haven, CT 06519 USA
[2] Yale Univ, New Haven, CT 06519 USA
关键词
expired gas; airway; gas exchange; dead space; mouth;
D O I
10.1152/jappl.1999.86.1.159
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Different volumes of dead-space gas were collected and analyzed for nitric oxide (NO) content, either immediately after inspiration or after a period of breath holding on clean air or NO mixtures. This allowed calculation of NO equilibrium, NO production, and NO absorption. In seven young, healthy, adult nonsmokers, the mean NO equilibrium values in parts per billion (ppb) were 56 +/- 11 (SE) in the trachea, 37 +/- 6 in the bronchi, 21 +/- 3 in the bronchioles, and 16 +/- 2 in the respiratory bronchioles. At any given NO concentration, the NO absorption rate (in nl/min) equaled the NO concentration (in ppb) times A (the absorption coefficient in l/min). A values (in l/min) were 0.11 +/- 0.01 in the trachea, 0.17 +/- 0.04 in the bronchi, 0.66 +/- 0.09 in the bronchioles, and 1.35 +/- 0.32 in the respiratory bronchioles. NO equilibrium concentrations and production rates in one 74-yr-old subject were three to five times as high as those found in the young subjects. Mouth equilibrium NO concentrations were 3 and 6 parts per million in two subjects who had oral production rates of 6 and 23 nl/min, respectively. In conclusion, production and absorption of NO occur throughout the first 450 ml of the airways.
引用
收藏
页码:159 / 167
页数:9
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