CV - Quiz 4, part 2 Pressure Volume Loops Flashcards
what does this represent?
Contractility
What does this represent?
Increased afterload
What does this represent?
Increased Preload
What does the blue arrow represent?
What does the loop represent?
Blue - the line is the End Systolic Pressure Volume Relationship (ESPVR).
Loop represents loss of inotropy NOT increased afterload because the ESPVR changed its slope and the whole loop moved
when the ESPVR changes it’s slope, it indicates a contractility issue. In this case it’s a LV failure.
What is the approximate blood pressure of the yellow loop?
120/80
What does this loop represent?
Afterload. Notice the End Diastolic Pressure Vol Relationship (ESPVR) line did not change angle.
A change in ESPVR would indicate a change in contractility
What does this loop represent?
Afterload - once again, notice that the ESPVR has not changed angle.
What does the Y-axis of the pressure-volume loop measure?
Pressure
What is measured on the X-axis of the pressure-volume loop?
Volume
Is time factored into a pressure volume loop?
No, the loop represents 1 beat or 1 cardiac cycle.
Which direction does the pressure-volume loop move during the cardiac cycle?
Counter clockwise
What is represented at points 1 and 2?
- Mitral Valve opens
- Mitral Valve closes
What is represented at points 3 and 4?
- Aortic Valve opens
- Aortic Valve closes
What is represented at point 5 (between the arrows)?
Stroke Volume
What does “A” represent?
What does “B” represent?
A: Loss of contractility (change of slope of the ESPVR)
B: Loss of compliance (change of slope of the EDPVR)
What does this represent?
Increased Preload
What does this represent?
Decreased preoload
