EDAN U60 - Page 149

U60 Diagnostic Ultrasound System User Manual Cardiac Measurements and Calculations
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LVMWI
Left Ventricular Muscle Weight
Index
LVMWI (No unit)=LVMW/BSA
A/E
The ratio of CA to CE
A/E (No unit)= CA (mm)/CE (mm)
LAD/AOD
Left Atrium Diameter / Aortic
root Diameter
LAD/AOD (No unit)= LAD (mm)/AOD (mm)
QMV
Mitral Valve Flow
QMV (mL)=4*DEV (cm/s)*DCT (s)
Table 9-4 Calculation Items
9.1.1. LV
The B+M mode and M mode measurements of LV are based on EDV and ESV measurements,
which are calculated by LVIDd and LVIDs measurements.
After measuring LVIDd and LVIDs and entering Heart Rate, LVET, and Height & Weight, the
system calculates some physiological parameters, such as EDV, ESV, SV, EF, FS, CO, MVCF, SI,
and CI.
There are two calculation formulas for heart antrum volume in the B+M mode and the M mode,
as shown below.
Item
Formula
TEICHHOLZ
EDV (mL)＝{7×LVIDd
3
(cm)
3
}/{2.4+ LVIDd}
ESV (mL)＝{7×LVIDs
3
(cm)
3
}/{2.4+ LVIDs}
CUBE
EDV (mL) = LVIDd
3 (
mm)
3
/ 1000
ESV (mL) = LVIDs
3 (
mm)
3
/ 1000
Table 9-5 TEICHHOLZ and CUBE Formula
NOTE:
Ensure that the value of LVIDd is bigger than that of LVIDs, or the system can not display
the calculation items.
SV and EF calculation is as below.
Measurement items:
LVIDd and LVIDs
To measure LV:
1. In the M-cardiac measurement menu, roll the trackball to highlight LV, and the submenu
will be displayed. Select TEICHHOLZ or CUBE and press Set. Then move the cursor to the
image area and a “+” is displayed.
2. Move the cursor to the end diastolic of left ventricle, and measure LVIDd The method is
similar to generic M mode distance measurement. LVIDd and EDV will be displayed in the
measurement result window.