Editing Cardiac output (section)

===Ejection fraction===
[[Ejection fraction]] (EF) is a parameter related to SV. EF is the fraction of blood ejected by the left ventricle (LV) during the contraction or ejection phase of the cardiac cycle or [[systole]]. Prior to the start of systole, during the filling phase ([[diastole]]), the LV is filled with blood to the capacity known as end diastolic volume (EDV). During systole, the LV contracts and ejects blood until it reaches its minimum capacity known as end systolic volume (ESV). It does not completely empty. The following equations help translate the effect of EF and EDV on cardiac output Q, via SV.
{{NumBlk2|::|<math>
\begin{align}
SV &= EDV - ESV \\
EF &= \frac{SV}{EDV} \times 100\% \\
Q &= SV \times HR \\
  &= \frac{EF \times EDV \times HR}{100\%}
\end{align}
</math>|3}}