Figure 3.

The mean trends and their analytic representation. (A) A set of mean trends of pulmonary arterial blood pressure changes mathematically defined by Eq. 3. M₁₆ is the last IMF that is nonoscillatory for the rat 04179801. The other M_k with k < 16 contains various levels of oscillations. (B) Analytic representation of the indicial response of pulmonary arterial blood pressure to step decrease of O₂ concentration from 20.9 to 10.0% at 6.00 h. The mean trends M_k(t), k = 16, 14, and 10, as defined by Eq. 3, are fitted by analytic functions as shown in each panel. (C) Indicial response of pulmonary blood pressure to a step increase of O₂ concentration from 10.0 to 20.9% at 30.00 h. The mean trends M_k(t), for k = 16, 14, and 10 are representable by analytic functions show in each panel.