Publication: Lung histeresis: a morphological view
Authors
Escolar Castellón, J.de D. ; Escolar castellón, A.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
The lung is an imperfect elastic body and for
this reason dissipates energy. The energy applied to the
lung in inspiration is not recovered in expiration. The
property of dissipating energy receives the name of
hysteresis. Lung hysteresis can be quantified because it
applies to the area between the ascending and
descending portions of the pressure-volume curve. Lung
hysteresis comprises parenchymal hysteresis and
bronchial hysteresis. Each point on the pressure-volume
applies to a different morphology of the lung
parenchyma. The changes that take place in the lung
architecture during expiration are related to alveolar
recruitment: in inspiration the lung volume increases by
the opening of distal air units. In expiration the lung
volume decreases due to derecruitment. The energy is
dissipated mainly in the alveolar recruitment process, in
which forces of molecular adhesion, such as surface
tension, are at work. Bronchial hysteresis involves the
dead space and the bronchial wall being greater in
expiration.
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