GE LOGIQ 7, Basic User Manual

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Cardiology
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84 LOGIQ 7 Basic User Manual
Direction 2392206-100 Rev. 1
Cardiac Output (CO)
To measure CO (Cardiac Output), make a velocity measurement
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.
1. Select CO from either the B-Mode or Doppler Touch Panel.
The trace caliper (horizontal dotted line) appears in the
Doppler spectrum.
2. Measure the Stroke Volume. See ‘Stroke Volume Ratio (SV)’
for more information.
After the stroke volume measurements have been
completed, a vertical line caliper appears in the Doppler
spectrum.
3. Measure the Heart Rate. See ‘Heart Rate’ for more
information.
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 Touch Panel:
• Velocity in Doppler Mode
• Functional Cross Sectional Area in B-Mode (Circumference/
Area)
• Heart Rate in Doppler Mode