Jon-Emile S. Kenny MD [@heart_lung] It is axiomatic that association is not causation. Sometimes, however, this principle is lost in the fuliginous fog of literature and life. It feels like we’ve known all of macrohemodynamics already, known the right atrial pressure [P
There's a sign error in here somewhere. Either the slopes need opposite signs as one goes up and one goes down, or the denominator of VR/CO needs to be Rv-Rh (with Rh being negative as a reflection of the fact that the heart is an energy input rather than a dissipator). As it is, I think you switched sign conventions between the triangle image and the written formula.
Literally just became a paid subscriber to get access to these old posts I recall from the prior version of this site. Great timing!