Effect of transpulmonary pressure on airway closure in immature and mature rabbits.
Effect of transpulmonary pressure on airway closure in immature and mature rabbits.
复制标题
跨肺压对未成熟和成熟兔气道闭合的影响。
DOI：
10.1152/jappl.1995.78.2.505
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Bray,W
中科院分区：
文献类型：
--
作者：
Tepper,RS;Gunst,SJ;Doerschuk,CM;Shen,X;Bray,W
The transpulmonary pressures (Ptp values) at which airway closure occurred during maximal stimulation with methacholine were compared in 10 mature and 9 immature rabbit lungs by using an alveolar capsule technique to assess airway closure. After maximal constriction, airway opening and alveolar capsule pressures were recorded during small volume oscillations as Ptp was lowered from 12 to 4 cmH2O. At each Ptp, the proportion of alveolar capsules indicating airway closure was greater for the immature than for the mature lungs (P < 0.025). At Ptp of 4 cmH2O, only 20% of alveolar capsules indicated airway closure in the mature lungs in contrast to 85% indicating closure in the immature lungs (P < 0.001). The in vitro sensitivity of tracheal smooth muscle to acetylcholine and histamine was greater in tissues from immature than from mature rabbits. We conclude that the more frequent airway closure observed in immature rabbits could reflect maturational differences in the structure of the bronchi or lung parenchyma or differences in the coupling between the parenchyma and the airways.
