Cardiac Formulas

From Ask Dr Wiki

Gradient = 4V²

AVA = CO/ (square root gradient)

AVA = (LVOT area/LVOT tvi) / (AV tvi)

MV t1/2 = Decel T ½ * 0.29

MVA = 220/ T ½

MVA = CO/ (sqr root gradient)

Qp/Qs = (FA - MV)/(PV - PA)

Regurg Volume TV = EDV - ESV

Forward Volume = Fick CO/HR

RV = TV - FV

RF = RV/TV

PA Wood unit = Mean PA/CO

EF = (LVEDD2 - LVESD2)/(LVEDD2)

EF = (EDV - ESV)/EDV

CO = (LVOTarea x TVI)*HR

Continuity A2 = (A1*TVI1)/TVI2

Regurgitant Vol = A1*TVI1 - A2*TVI2

Effective Regurgitant Orifice = RV/TVI