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CHISON 600M (2009 VERSION) ULTRASOUND SYSTEM
7.7.1.2
Measurement and Calculation
Heart rate
Same as “Heart rate” measurement in M mode
7.7.1.3
Ejection time
Same as “Time” measurement in M mode
7.7.1.4
Input
The value of Heart rate, Ejection time, height and weight may be input directly through keyboard by “Input” function.
After the value of height and weight is input, the result of BSA will appear in the measurement result area.
Formula: BSA=0.0061×Height+0.0128×Weight-0.1529
BSA : Body surface area
In the formulae, the unit of BSA is m2, the unit of Height is cm, the unit of Weight is kg.
7.7.1.5
Left ventricular function
Left ventricular measurement in M mode is performed by measuring Left ventricular short axis diameter both at
end diastole and at end systole. After Left ventricular measurement, the relevant parameters including SV (Stoke
volume), EF(Ejection fraction),SF(Shortening fraction) will be calculated and displayed on the screen
automatically. If other operations are performed before Left ventricular measurement, such as measuring or
inputting heart rate and ejection time, inputting height and weight, the parameters of CO, CI, SI, LVMW and
MVCF will be calculated and displayed on the screen after Left ventricular measurement.
Left ventricular measurement Formula:
EDV=7.0×LVIDd3 /（LVIDd+2.4）
ESV=7.0×LVIDs3 /（LVIDs+2.4）
SV=|EDV-ESV|
EF=SV/EDV×110%
SF=(LVIDd-LVIDs)/LVIDd×110%
EDV: End-diastolic left ventricular volume
ESV: End-systolic left ventricular volume
LVIDd: Left ventricular short axis diameter at end diastole
LVIDs: Left ventricular short axis diameter at end systole
SV: Stoke volume
EF: Ejection fraction
SF: Shortening fraction
In the above formulae:
The unit of EDV and ESV is ml, the unit of LVIDd and LVIDs is cm,
the unit of SV is ml, the unit of EF and SF is %, the unit of CO is l/min, the unit of HR is bpm.
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