Cardiac Cycle Flashcards
1
Q
What ECG phase corresponds with the ejection phase?
A
ST interval
2
Q
Define LVEDV.
A
volume of blood left in LV at end of diastole
3
Q
Define LVESV.
A
volume of blood left in LV at end of systole
4
Q
How is SV calculated?
A
LVESV - LVEDV
5
Q
How is the ejection fraction calculated?
A
EF = SV / LVEDV
6
Q
What is a normal EF?
A
60-65%
7
Q
In the PV loop, what point is an index of preload?
A
LVEDP, LVEDV
8
Q
In the PV loop, what point is an index of afterload?
A
LVESP
9
Q
What does the area of a PV loop represent?
A
Work of the heart (not CO)
10
Q
How is MAP calculated?
A
MAP = CO * TPR MAP = HR * SV * TPR MAP = DBP + (1/3)*(SBP - DBP)
11
Q
What is Ohm’s Law?
A
I = V / R
12
Q
What factors can the body control to regulate MAP?
A
HR, SV, TPR
