Fig. 1
From: On the practical identifiability of a two-parameter model of pulmonary gas exchange
Schematic representation of the gas exchange model. The model consists of two alveolar compartments, one with low and one with high ratio between ventilation \(\dot{V}\) and perfusion Q respectively. Blood flow is distributed among the shunt f s and the two alveolar compartments. The low \(\dot{V}/Q\)-compartment is perfused with a fixed fraction f Q of 90 % of the non-shunted blood and ventilated with fraction f A . FiO 2 describes the fraction of oxygen in inspired air. PaO 2 and PaCO 2 are arterial partial pressures of oxygen and carbon dioxide respectively