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Department of Physics, Massey University, Palmerston North, New Zealand 5320; and Respiratory Health Network of Centres of Excellence, University of British Columbia Pulmonary Research Laboratory, St. Paul's Hospital, Vancouver, British Columbia, Canada V6Z 1Y6
Received 18 July 1996; accepted in final form 6 March 1997.
Lambert, Rodney K., and Peter D. Paré. Lung
parenchymal shear modulus, airway wall remodeling, and bronchial
hyperresponsiveness. J. Appl. Physiol.
83(1): 140-147, 1997.
When airways narrow, either through the
action of smooth muscle shortening or during forced expiration, the
lung parenchyma is locally distorted and provides an increased
peribronchial stress that resists the narrowing. Although this
interdependence has been well studied, the quantitative significance of
airway remodeling to interdependence has not been elucidated. We have
used an improved computational model of the bronchial response to
smooth muscle agonists to investigate the relationships between airway
narrowing (as indicated by airway resistance), parenchymal shear
modulus, adventitial thickening, and inner wall thickening at lung
recoil pressures of 4, 5, and 8 cmH2O. We have found that, at low
recoil pressures, decreases in parenchymal shear modulus have a
significant effect that is comparable to that of moderate thickening of
the airway wall. At higher lung recoil pressures, the effect is
negligible.
dose-response; airway mechanics
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