Cardiovascular interaction
8 important questions on Cardiovascular interaction
What is the volume that can be in the arterial or venous system that causes no stretch? (so the unstretched volume)
Venous = 2 L
Is the arterial or venous system more compliant?
What pressure determines how far the ventricle will fill?
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What pressure determines how much volume is ejected?
How is the cardiac function determined?
- Chronotropy (heart rate)
- Inotropy (systolic function)
- Lusitropy (diastolic function)
Loading conditions:
- preload and afterload
How is the vascular function determined?
Compliance (dV/dP)
What is cardiovascular interaction?
Normally the cardiovascular system is at equilibrium, CO=VR, but what happens when CO > VR?
-> increase in MAP and decrease in CVP => increase of dP
-> an increase of ESV and decrease of EDV => decrease of SV
-> increase VR and decrease CO
-> new steady-state CO=VR
--> the new level will always be higher! So, a higher CO, higher MAP and lower CVP
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