19 Monitoring Maternal Heart / Pulse Rate
156
beat MECG heart rate trace or an ultrasound heart rate trace calculation, having switched to the
maternal rate with no significant delay. Note that Maternal Pulse from Toco has an averaging of 4
seconds and an overall delay of between 6 and 8 seconds.
MHR from MECG Electrodes
You can measure MHR using the equipment combinations shown in the following illustrations.
Illustration 1 shows the complete connection chain from the foam electrodes applied to the patient to
the fetal monitor using the patient module.
A Pre-gelled Foam Electrodes (40493A/B/C/D/E)
B MECG Adapter Cable (M1363A)
C Patient Module (M2738A)
Illustration 2 shows the equivalent chain using the Toco
+
transducer.
A Pre-gelled Foam Electrodes (40493A/B/C/D/E)
B MECG Adapter Cable (M1363A)
C Toco+ Transducer (M2735A)
To simultaneously measure DECG and MHR, you use a Toco
+
transducer for DECG, and a patient
module for MECG (see also “Monitoring FHR Using DECG” on page 137).
1 Cross-Channel Verification
(CCV) has detected a
coincidence situation
2 Fetal heart rate trace from
Ultrasound
3 Maternal pulse trace from SpO
2
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