Effects of viscoelasticity on volume distribution in a two-compartmental model of normal and sick lungs.
Among the models describing respiratory mechanics none has been published with the characteristics of two lung compartments including the viscoelastic properties. We used such a model to describe the inspiratory compartmental volume distribution under homogeneous and inhomogeneous conditions. The present mathematical model was tested against actual data and proven accurate. The volume distribution was studied using data from normal subjects and from patients with COPD and ARDS. In a normal lung, changes in viscoelastic constants in one compartment can modify substantially the volume distribution diverting more or less gas to the other compartment. In diseased compartments, the increase of viscoelasticity increased the difference between the compartments and the opposite was true in the less affected compartment. In conclusion, the viscoelastic properties are of paramount importance in determining gas distribution in normal and sick lungs.
Antonaglia
Vittorio
V
Department of Anesthesia and Intensive Care, Laboratory of Respiratory Biomechanics, University of Trieste, 34139 Trieste, Italy. v.antonaglia@libero.it
Torelli
Lorenzo
L
Zin
Walter A
WA
Gullo
Antonino
A
D000403:Airway Resistance; D004548:Elasticity; D006801:Humans; D008168:Lung / Q000502:physiology*; D008962:Models, Theoretical; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications* / Q000503:physiopathology; D015203:Reproducibility of Results; D012119:Respiration; D012128:Respiratory Distress Syndrome / Q000150:complications* / Q000503:physiopathology; D012680:Sensitivity and Specificity