Fig. 5From: The linear relationship between systolic pulmonary artery pressure and mean pulmonary artery pressure is maintained regardless of autonomic or rhythm disturbancesGeometric limitation of the DPAP. Four fictive pulmonary pressure waves are illustrated sharing the same MPAP and SPAP. For a given period, if the MPAP are equal, then the areas a, b, c, and d are the same in all cases. The area B, SPAP, E and E, DPAP, and C have to be equal. Changing the area of A,SPAP, and E is geometrically limited and include the possible values of DPAPBack to article page