Definition
- Stroke volume (SV) is the volume of blood ejected by each ventricle with each beat; normal SV is about 70 mL.
- Ejection fraction (EF) is the percentage of end-diastolic volume ejected with each beat, EF = SV/EDV × 100; normal EF is about 65%.
Normal Values
Normal values of stroke volume, ejection fraction and related ventricular volumes
Parameter
Stroke volume (SV)
- Normal value
- 70 mL
End-diastolic volume (EDV)
- Normal value
- 130 mL
End-systolic volume (ESV)
- Normal value
- 50 mL
Ejection fraction (EF)
- Normal value
- 65%
Cardiac index (CI)
- Normal value
- 3.2 L/min/m²
Cardiac reserve
- Normal value
- 15 to 25 L/min (non-athletes); 20 to 40 L/min (trained athletes)