GE Logiq 500, Advanced Reference Manual

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