Figure 9.

Linear regression plots for the global Z_V/Z_Q ratio versus the Q_s/Q_t (top) or the V_D/V_T (bottom). Q_s/Q_t = venous admixture; V_D/V_T = fractional dead space; Z_Q = perfusion-induced change in thoracic impedance; Z_V = ventilation-induced change in thoracic impedance.