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8.5.3.5 Inner Diameter of Main Pulmonary Artery
Steps:
1.
Press the Measure key in the real time or frozen B/Color/PDI mode, and the measurement menu
displays
on the top left of the screen.
2.
Select [PA] on the menu by moving the trackball and press Set to confirm. A marker displays on the
image.
3.
Perform a distance measurements and the measurement results displays in the result box.
8.5.3.6 Cardiology Measurement in the M mode
Cardiology measurements in the M mode include left ventricle measurement, mitral valve
measurement, aorta
measurement, ejection time measurement, LVMW measurement and HR
measurement.
8.5.3.7 Left Ventricle
The methods for measuring left ventricle in the M mode are as follows.
● Teichholz method
● Cube method
You should input the height, weight and heart rate before performing the cardiac measurement. Otherwise, CO,
CI and SI cannot be calculated. You should measure the ET, otherwise MVCF cannot be calculated.
Teichholz method
This measurement method approximates the LV volume by measuring a cube.
Steps:
1.
Press the Measure key in the real time or frozen M mode, and the measurement menu
displays on the top left of the screen.
2.
Select [LV] on the menu by moving the trackball and press Set to confirm.
3.
Select [Teichholze] on the pop-up menu and a marker displays on the image.
4.
Perform the LVIDd -> LVIDs measurements one by one and the measurement results
displays in the result box.
Measurement Item
Measurement Sub-item Description
Measurement Method
LVIDd
LV internal dimension at
end diastole
Left Ventricle/
Teichholz
Method
LVIDs
LV internal dimension at
end systole
Refer to Section
8.4.2.1 Distance.
The system automatically calculates the following items according to the measurement results.
Calculation
Item
Description
Formula
EDV
End-diastolic Left Ventricular Volume
EDV(ml)=(7
×
LVIDd
)/(2.4 + LVIDd(cm))
FS
Fractional Shortening
FS = 100%
×
(LVIDd(cm)- LVIDs(cm))/ LVIDd(cm)
ESV
End-systolic Left Ventricular Volume
ESV(ml)=(7
×
LVIDs
)/(2.4+LVIDs(cm))
SV
Stroke Volume
SV = EDV(ml) - ESV(ml)
EF
Ejection Fraction
EF=100%
×
SV(ml)/EDV(ml)
SI
Stroke Volume Index
SI=SV(ml)/BSA
CO
Cardiac Output
CO(l/min)=SV(ml)
×
HR(bpm)/1000