Abstract:
:Lung distensibility and airway mechanics were evaluated in 24 asthmatic children and adolescents, ages between 7 and 21 years, by quasi-static pressure-volume curves and by the static recoil-lung conductance relationship. The measurements were obtained by the step-wise inflation technique and the pressure-volume curves were analyzed by a new sigmoid exponential curve-fitting model of the form: VL = Vm + [VM/(1 + be-K . PstL)], where VL is lung volume, PstL is static recoil pressure, VM and Vm are the upper and lower asymptotes, and K and b are shape constants. The shape constant K serves as index for lung distensibility, whereas the slope of theta of the static recoil-lung conductance plot represents the flow-resistive behavior of the airways. The combined evaluation of these two parameters (K and theta) shows that some asthmatic children have a very high lung distensibility and normal airway function, whereas others have nearly normal lung elasticity but grossly reduced airway distensibility. Sigmoid exponential analysis of static pressure-volume curves and an evaluation of the static recoil-lung conductance relationship in asthmatic children enable a distinction of these two types of functional derangements. Increased pulmonary distensibility consistent with an increase of alveolar air space seems to indicate an involvement of tissue elements. In contrast, decreased airway distensibility indicates a defect in the conducting airways. Sympathomimetics not only have a positive effect on airway mechanics, but seem to increase lung distensibility both in patients with hyperinflation and to an even greater degree in patients whose lungs are already too compliant.
journal_name
Pediatr Resjournal_title
Pediatric researchauthors
Kraemer R,Geubelle Fdoi
10.1203/00006450-198411000-00020subject
Has Abstractpub_date
1984-11-01 00:00:00pages
1154-9issue
11eissn
0031-3998issn
1530-0447journal_volume
18pub_type
杂志文章abstract::An important feature of the role of IgA in protection against infection and disease at the level of the mucosal surfaces might be the elimination of pathogens without induction of a strong inflammatory reaction. In the present study we addressed the question whether IgA has a regulatory effect on the generation of rea...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199408000-00016
更新日期:1994-08-01 00:00:00
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更新日期:2006-09-01 00:00:00
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更新日期:1980-08-01 00:00:00
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更新日期:2018-01-01 00:00:00
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doi:10.1203/00006450-199606000-00021
更新日期:1996-06-01 00:00:00
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pub_type: 已发布勘误
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更新日期:1989-12-01 00:00:00
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pub_type: 杂志文章
doi:10.1203/00006450-199311000-00023
更新日期:1993-11-01 00:00:00
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更新日期:2000-07-01 00:00:00
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更新日期:2001-03-01 00:00:00
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pub_type: 杂志文章
doi:10.1203/00006450-198009000-00015
更新日期:1980-09-01 00:00:00
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journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199612000-00011
更新日期:1996-12-01 00:00:00
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journal_title:Pediatric research
pub_type: 杂志文章
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更新日期:2017-05-01 00:00:00
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pub_type: 杂志文章
doi:10.1203/00006450-199305000-00012
更新日期:1993-05-01 00:00:00
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更新日期:2015-01-01 00:00:00
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doi:10.1203/00006450-197612000-00005
更新日期:1976-12-01 00:00:00
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journal_title:Pediatric research
pub_type: 杂志文章
doi:
更新日期:1994-04-01 00:00:00
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更新日期:2006-10-01 00:00:00
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pub_type: 杂志文章
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更新日期:1981-02-01 00:00:00
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更新日期:2020-04-01 00:00:00
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更新日期:2014-06-01 00:00:00
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journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199311000-00013
更新日期:1993-11-01 00:00:00
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更新日期:1992-10-01 00:00:00
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pub_type: 杂志文章
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更新日期:1982-03-01 00:00:00
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journal_title:Pediatric research
pub_type: 临床试验,杂志文章
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更新日期:2002-08-01 00:00:00