User guide

60 Exam-based calculations
a From the calculations menu, locate Qp/Qs
and then select LVOT D or RVOT D.
b Position the calipers. (See “Working with
calipers” on page 43.)
c Save the calculation. (See “To save a
calculation” on page 47.)
3 On a frozen Doppler spectral trace, press the
CALCS key.
4 Do the following to measure from LVOT VTI and
again to measure from RVOT VTI:
a From the calculations menu, select Qp/Qs
and then select LVOT VTI or RVOT VTI.
b Press the
SELECT key to start the trace.
c Using the touchpad, trace the waveform.
To make a correction, select Undo
on-screen, backtrack with the touchpad, or
press the
BACKSPACE key.
d Press the
SET key to complete the trace.
e Save the calculation. (See “To save a
calculation” on page 47.)
For information on the automatic trace tool, see
“To trace automatically (Doppler)” on
page 46.
To calculate Stroke Volume (SV) or Stroke
Index (SI)
The SV and SI calculations require a measurement
in 2D and a measurement in Doppler. SI also
requires Body Surface Area (BSA). After the
measurements are saved, the result appears in the
patient report.
1 (SI Only) Fill in the Height and Weight fields on
the patient information form. The BSA is
calculated automatically. (See “To create a
new patient information form” on page 36.)
2 Measure from LVOT (2D):
a On a frozen 2D image, press the
CALCS key.
b From the calculations menu, select LVOT D.
c Position the calipers. (See “Working with
calipers” on page 43.)
d Save the calculation. (See “To save a
calculation” on page 47.)
3 Measure from aorta (Doppler). See “To
calculate Velocity Time Integral (VTI)” on
page 57. From the calculations menu, select AV
and then select VTI.
For information on the automatic trace tool, see
“To trace automatically (Doppler)” on
page 46.
To calculate Heart Rate (HR)
Heart Rate is available in all cardiac packages. The
Heart Rate is not calculated using the ECG trace.
Saving the heart rate to the patient report
overwrites any heart rate entered on the patient
information form.
1 On a frozen Doppler spectral trace, press the
CALCS key.
2 From the calculations menu, select HR.
A vertical caliper appears.
3 Using the touchpad, position the first vertical
caliper at the peak of the heartbeat.
4 Press the
SELECT key.
A second vertical caliper appears. The active
caliper is highlighted green.
5 Using the touchpad, position the second vertical
caliper at the peak of the next heartbeat.
6 Save the calculation. (See “To save a
calculation” on page 47.)
To calculate Cardiac Output (CO) or
Cardiac Index (CI)
The CO and CI calculations require Stroke Volume
and Heart Rate calculations. CI also requires Body
Surface Area (BSA). After the measurements are
saved, the result appears in the patient report.