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19Monitoring Maternal Heart /
Pulse Rate
You can monitor the maternal heart/pulse rate using one of four sources:
• Maternal heart rate (MHR) via MECG electrodes
•SpO
2
(pulse rate)
• Maternal pulse from Toco MP transducer (pulse rate)
• NBP (pulse rate)
Maternal heart / pulse rates derived from MECG, SpO
2
and Toco MP are continuous measurements,
and are compared against the FHR for cross-channel verification. Average pulse rate derived from
noninvasive blood pressure is an intermittent measurement, and is therefore not used for cross-
channel verification.
Priority for Maternal Heart / Pulse Rate
Only one Maternal Heart Rate / Pulse Rate numeric will be displayed and recorded at a time (see
priority table). Note that when higher-priority measurements are connected but temporarily not
providing valid numerics, lower-priority numerics may be displayed and recorded instead.
Cross-Channel Verification
It is recommended that you monitor both the maternal pulse rate/heart rate and the fetal heart rates to
reduce the risk of misinterpreting the maternal heart rate for the fetal heart rate. See “Confirm Fetal
Life Before Using the Monitor” on page 10 and “Cross-Channel Verification” on page 97.
SpO
2
pulse rate traces have an averaging calculation of approximately 10 seconds and an overall delay
of approximately 12 seconds (depending on printer speed). This differs from a non-averaged beat-to-
Priority Maternal Heart / Pulse Rate Source Used for CCV Provides QRS Tone
1 HR from MECG measurement Yes Yes
2 Pulse from SpO
2
measurement Yes Yes
3 Pulse from Toco MP transducer Yes No
4 Pulse from NBP measurement No No
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