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  • Title: A tidally breathing model of ventilation, perfusion and volume in normal and diseased lungs.
    Author: Yem JS, Turner MJ, Baker AB, Young IH, Crawford AB.
    Journal: Br J Anaesth; 2006 Nov; 97(5):718-31. PubMed ID: 16926169.
    Abstract:
    BACKGROUND: To simulate the short-term dynamics of soluble gas exchange (e.g. CO2 rebreathing), model structure, ventilation-perfusion (VA/Q) and ventilation-volume (VA/VA) parameters must be selected correctly. Some diseases affect mainly the VA/Q distribution while others affect both VA/Q and VA/VA distributions. Results from the multiple inert gas elimination technique (MIGET) and multiple breath nitrogen washout (MBNW) can be used to select VA/Q and VA/VA parameters, but no method exists for combining VA/Q and VA/VA parameters in a multicompartment lung model. METHODS: We define a tidally breathing lung model containing shunt and up to eight alveolar compartments. Quantitative and qualitative understanding of the diseases is used to reduce the number of model compartments to achieve a unique solution. The reduced model is fitted simultaneously to inert gas retentions calculated from published VA/Q distributions and normalized MBNWs obtained from similar subjects. Normal lungs and representative cases of emphysema and embolism are studied. RESULTS: The normal, emphysematous and embolism models simplify to one, three and two alveolar compartments, respectively. CONCLUSIONS: The models reproduce their respective MIGET and MBNW patient results well, and predict disease-specific steady-state and dynamic soluble and insoluble gas responses.
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