GE LOGIQ 500 Advanced Reference Manual page 137

Doppler Analysis – Aortic Valve (D-AV) (cont'd)
Calc Mnemonic
AV-A Aortic Valve Area by
cont'Eq
LVOTA Left Ventricular Outflow
Tract Area at Systole
AccT Flow Acceleration Time
DecT Flow Deceleration Time
PkFVI Peak Flow Velocity Intergal one velocity,
MeanFV Mean Flow Velocity
QP:QS QP:QS Ratio
MaxPG Maximum Pressure
Gradient
MeanPG Mean Pressure Gradient
SV Stroke Volume
SI Stroke Volume Index
CO Cardiac Output
CI Cardiac Index
LOGIQ 500 Advanced Reference Manual
2276614–100 Rev. 0
Calc Name Input Measurements
one distance
two velocities
LVOTs of PLAX
two time intervals
two time intervals
one time interval
flow velocities,
one time interval
two CO
two velocities
flow velocities
flow velocities, one area
(by ellipse or trace or
circle)
body surface area and SV
flow velocities, one area
(by ellipse, trace or circle)
and one time
interval
body surface area and CO
Table 4–25. Aortic Valve (D-AV) (cont'd)
Advanced Cardiac Calculations
AV-A[mm or cm]=
LVOT-A x PFV-LV/PFV-AV
LVOTA[cm^2]=
π x (LVOTs)^2 /4
AccT[msec or sec]=
t<PFV-AV>-ts<ET>
DecT[msec or sec]=
te<ET>-t<PFV-AV>
PkFVI[mm or cm]=
1.14 x PFV–AV x ET/
20+.03
MeanFV[cm/s or m/s]=FVI/
t<FVI>
QP:QS=CO(PV)/
CO(AV)
MaxPG[mmHg]=
4 x (PFV-AV^2)
MeanPG[mmHg]=
n
4 x Σ (V^2/n)
i=1
AV–A is calculated.
SV[ml]=FVI–AV x AV–A
else
SV[ml]=FVI–AV x (π/4) X
(AOs)^2
SI[ml/m^2]=
SV/BSA
CO[ml]=
SVxHR/1000
CI[ml/min/m^2]=
CO/BSA
Formula
4–91