Figure 2. The time course of pulmonary arterial pressure and airway pressure changes after injection of heparin-protamine (H-P) or non-heparin-protamine (non-H-P) complexes in goats. Pulmonary arterial pressure and airway pressure increased significantly in the H-P complexes group, but in the non-H-P complexes group no changes were observed. Values represent percentage of baseline (before) and are given as means plus/minus SD. *P < 0.05 versus before injection; (dagger)P < 0.05 versus non-H-P complexes group.