Fluke Biomedical medSim 300B - Manual (Page 120)

medSim 300B
Operators Manual
4-22
The medSim 300B does not simulate any indirect measurements of fetal heart rate and
intrauterine pressure, such as obtained by phonocardiography, tocodynamometer,
ultrasound, etc.
Note
To produce fetal and maternal ECG simulations for fetal monitor
evaluation, you will need:
• Intrauterine pressure cables (refer to the current Fluke Biomedical
Price List for availability, part number information, and price).
• Fetal scalp electrode.
• Maternal thigh reference plate and ECG cable.
• Three jumper wires.
Intrapartum Fetal and Maternal Heart Rate
You can add a fetal heart rate (FHR), fixed or periodic, to the maternal ECG. The fixed
FHR is not affected by uterine contractions while the periodic FHR reflects uterine
contractility.
When you add FHR to the maternal ECG, the maternal R-wave amplitude is reduced by
50 %. This amplitude returns to normal when you remove the FHR.
The next two drawings illustrate:
• A maternal ECG
• A maternal ECG with fetal ECG added
eic185.eps
Figure 4-16. medSim 300B Simulated Maternal ECG
Note
Blood pressure = 120/80; heart rate = 80 BPM.
Fetal ECG Maternal R Wave, reduced by 50%
eic186.eps
Figure 4-17. medSim 300B Simulated Maternal ECG with Fetal ECG Added