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Separating FHR Traces
To help you to interpret traces with similar baselines, you can separate the baselines by an offset of
20 bpm by switching trace separation on. For details of the offset, see "Determining the Separation
Order" on page 116.
"Standard" Separation Order
To make differentiating the traces easier, the trace for FHR2 is offset by +20 bpm, and the trace for
FHR3 is offset by -20 bpm. In other words, the trace for FHR2 is recorded 20 bpm higher than it
really is, while the trace for FHR3 is recorded 20 bpm lower than it really is. The trace for FHR1 is
never shifted.
•
The recorder prints a dotted line labeled
•
The recorder prints a dotted line labeled
•
The FHR trace is labeled
•
The label for FHR2 is annotated with
The following trace shows triplets with
The traces for FHR2 and FHR3 are offset. The numerical FHR values displayed on the monitor
remain unchanged. Subtract 20 from the recorded trace for FHR2 to obtain the true FHR2. For
example, if the recorded trace shows 160, then the true FHR is 140. Similarly, add 20 to the recorded
trace for FHR3 to obtain the true FHR3.
"Classic" Separation Order
To make differentiating the traces easier, the trace for FHR1 is offset by +20 bpm, and the trace for
FHR3 is offset by -20 bpm. In other words, the trace for FHR1 is recorded 20 bpm higher than it
really is, while the trace for FHR3 is recorded 20 bpm lower than it really is. The trace for FHR2 is
never shifted.
•
The recorder prints a dotted line labeled
•
The recorder prints a dotted line labeled
•
The FHR trace is labeled
across the FHR scale, to identify the trace for FHR2.
across the FHR scale, to identify the trace for FHR3.
and
every 5cm.
and the FHR3 label is annotated with
Trace Separation
on, and using
across the FHR scale, to identify the trace for FHR1.
across the FHR scale, to identify the trace for FHR3.
and
every 5cm.
12 Monitoring Triple FHRs
.
Standard
separation order.
123
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Troubleshooting
