So, I am gearing up for another run through the ICU and always have a few patients with swans. I have read the section in the ICU book and memorize the hemodynamic numbers, but I never really have a great grasp on the physiology of these numbers and how they change (ex. why CO/ CI drops in low volume states, the various changes with different types of distributive shock). Can anyone suggest a reference that explains things in a stepwise manner that is relatively easy to follow?