GE Medical Systems 500, User Manual, Page: 326 / 636

LV Measurement Methods
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
10–14
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Modified Simpson’s Rule Method (cont’d)
Calc Mnemonic Calc Name Input Measurements Formula
LVLd Left Ventricular Length,
Diastole one distance LVLd=d1[cm or mm]
LVLs Left Ventricular Length,
Systole one distance LVLs=d1[cm or mm]
LVAMd Left Ventricular Area,
Mitral Valve, Diastole one area (by ellipse,
trace or circle) LVAMd=a1[cm ^2]
LVAMs Left Ventricular Area,
Mitral Valve, Systole one area (by ellipse,
trace or circle) LVAMs=a1[cm ^2]
LVAPd Left Ventricular Area,
Papillary Muscles,
Diastole one area (by ellipse,
trace or circle) LVAPd=a1[cm ^2]
LVAPs Left Ventricular Area,
Papillary Muscles,
Systole one area (by ellipse,
trace or circle) LVAPs=a1[cm ^2]
EdV End Diastole Volume one distance and two
areas (by ellipse, trace
or circle) EdV[ml]=LVLd/3
x(LVAMd+(LVAMd+
LVAPd)/2+ LVAPd/3)
EsV End Systole Volume one distance and two
areas (by ellipse, trace
or circle) EsV[ml]=LVLs/3
x(LVAMs+(LVAMs+
LVAPs)/2+ LVAPs/3)
SV Stroke Volume two distances and four
areas (by ellipse, trace
or circle) SV[ml]=EdV–EsV
CO Cardiac Output two distances and four
areas (by ellipse, trace
or circle) and one 2 beat
time interval CO[1/min]=
SVxHR/1000
EF Ejection Fraction two distances and four
areas (by ellipse or trace
or circle) EF=SV/EdVx100
HR Heart Rate
(beats/minute) one 2 beat time interval HR=120[sec]/
2 beat time[sec]
PHT Pressure Half Time one time interval PHT=t1[ms orsec]
MVA Mitral Valve Area one pressure half time
interval MVA[cm^2]= 220/PHT
ET Ejection Time one time interval ET=t1[ms or sec]
Table 10–4. Modified Simpson’s Rule Method Formulas