So, i'm a little bit confused on venodilators and their effects on TPR, EDV, and Venous return.
On page 267 of FA 2016 it states that "Preload: Preload approximated by ventricular EDV. Vendoilators decrease preload."
Then on page 269 of first aid, graph C shows that a decrease in TPR will actually increase venous return.
These two statements seem to be at odds with each other? Isn't venous pressure part of TPR? Why does it say that venodilators decrease preload, while decreasing TPR increases preload?
On page 267 of FA 2016 it states that "Preload: Preload approximated by ventricular EDV. Vendoilators decrease preload."
Then on page 269 of first aid, graph C shows that a decrease in TPR will actually increase venous return.
These two statements seem to be at odds with each other? Isn't venous pressure part of TPR? Why does it say that venodilators decrease preload, while decreasing TPR increases preload?