Functions of the LV Flashcards
1
Q
Work per unit of time
Equal to CO x Aortic Pressure
Two components: Volume Work (Cardiac Output) & Pressure Work (Aortic Pressure)
A
Cardiac minute work
2
Q
Increased by increased afterload, size of the heart, contractility, heart rate
A
Myocardial O2 consumption
3
Q
Ratio of work output to total chemical energy expenditure
Normal value: just 20-25% (most of the energy used by the heart is just converted to heat)
A
Maximum Efficiency of Cardiac contraction
4
Q
Work the heart performs on each beat
Equal to SV x Aortic Pressure
Primary source of energy for stroke work
A
Stroke work
