5-8 170 Series Monitor Revision D
2003023-001
Fetal Heart Rate Monitoring: Heartbeat Coincidence
Strip Chart Annotation
When heartbeat coincidence detection is enabled, and both heart rate channels are
active, the annotation
HBC prints in the center margin
of the strip chart paper following the active FHR modes. (Refer to Figure 5-3.)
As soon as heartbeat coincidence is detected, two overlaid hearts print in the
upper portion of the top grid of the strip chart paper; the hearts print twice per page
for as long as coincidence is detected. Once coincidence is resolved, two side-by-
side hearts
print once. (Refer to Figure 5-3.)
If you disconnect a transducer while coincidence is detected, the overlaid hearts
stop printing and the side-by-side hearts print once. In addition, the mode status
line prints on the strip chart paper—without the HBC annotation—indicating the
deactivated mode.
Figure 5-3. Simulated Heartbeat Coincidence Detection Trace
Coincidence detected.
Coincidence resolved.
Coincidence enabled.
This annotation prints
every ten minutes along
with the modes.
Simulated trends.
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