5-6 170 Series Monitor Revision D
2003023-001
Fetal Heart Rate Monitoring: Fetal Heart Rate Offset
Activating the Fetal Heart Rate Offset Mode
When you activate the heart rate offset mode, the secondary FHR trend is shifted
+20 BPM. (See
Figure 5-2.)
1. Ensure the recorder is on.
2. Press and hold the Mark/Offset button for two seconds. You will hear a
“beep” for confirmation.
On a Model 172 or 174 (dual ultrasound), the secondary ultrasound trace is
shifted +20 BPM and the
symbol is printed on the upper portion
of the heart rate grid every page.
On a Model 173 or 174 (US/FECG), the ultrasound trace is shifted +20
BPM and the
symbol is printed on the heart rate grid every page.
Upon activation, a vertical dashed line is printed to draw attention to the
start of the shifted trend.
De-Activating the Fetal Heart Rate Offset Mode
After the FHR patterns have been assessed, set the secondary FHR trend back to the
normal (unshifted) position.
1. Ensure the recorder is on.
NOTE: If the auto-revert (10-MIN)
feature is enabled, the shifted heart rate
trace automatically reverts to normal
after 10 minutes. (Refer to the “170
Series Service Manual” for more
information.)
2. Press and hold the Mark/Offset button for two seconds. You will hear a
“beep” for confirmation.
The trend returns to the unshifted position.
A vertical dashed line is printed to draw attention to the change.
US2
+
20
US
+
20
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