General Calculations
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
8–4
Cardiac Output (CO)
To measure CO (Cardiac Output), a velocity measurement is
taken in the Doppler Spectrum. An FCA (Flow Cross Sectional
Area) is measured on the vessel in B-Mode. These two
measurements are used to calculate SV (Stroke Volume).
Finally, a HR (Heart Rate) measurement is taken in the Doppler
Spectrum. SV and HR are then used to calculate cardiac
output.
Mean PG
Max PG
CO
SV
HEART
RATE
TRACE
AUTO
FVO
FV
Figure 8–2. General Calculations Sub-Menu (CO)
Select CO from the Calculation Sub-Menu. The trace cursor
(horizontal dotted line) appears in the Doppler spectrum.
See Stroke Volume Ratio on
8–5
for a step-by-step procedure
on SV. After the stroke volume measurements have been
completed, a vertical line cursor appears in the Doppler
spectrum. Measure the Heart Rate. Refer to the procedure
found on
10–30
.
CO (Cardiac Output) is computed from the SV and HR values
and is displayed.
Automatic CO calculation
If the following measurements have previously been made in
any order, CO (Cardiac Output) automatically calculates when it
is selected from the Calculation Sub-Menu:
Velocity in Doppler Mode
Functional Cross Sectional Area in B-Mode
(Circumference/Area)
Heart Rate in Doppler Mode
Summary of Contents for 500
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