. 2020 Jun 23;11:667. doi: 10.3389/fphys.2020.00667

TABLE 1.

Calculation of ventricular function and aortic circumferential strain.

LV FS	$\frac{L V I D_{d} - L V I D_{s}}{L V I D_{d}} \cdot 100 %$
LV EF	$\frac{L V I D_{d}^{3} - L V I D_{s}^{3}}{L V I D_{d}^{3}} \cdot 100 %$
LV FAC	$\frac{A r e a_{d} - A r e a_{s}}{A r e a_{d}} \cdot 100 %$
LVPW thickening	$\frac{L V P W_{s} - L V P W_{d}}{L V P W_{d}} \cdot 100 %$
Aorta circumferential strain	$\frac{1}{2} \cdot ({(\frac{I D_{A O, s}}{I D_{A O, d}})}^{2} - 1) \cdot 100 %$
Aortic flow	π⋅(ID_AO/2)²⋅VTI_AO⋅HR
Pulmonary flow	π⋅(ID_PA/2)²⋅VTI_PA⋅HR

AO: aorta, d: diastole, EF: ejection fraction, FAC: fractional area change, FS: fractional shortening, HR: heart rate, ID: inner diameter, LV: left ventricle, LVID: left ventricular inner diameter, LVPW: left ventricular posterior wall, PA: pulmonary artery s: systole, VTI: velocity time integral.