Fluke-biomedical MPS450 User Manual download pdf (Page 71)

Cardiac Functions

Fetal / Maternal ECG (Option) 2

2-39

Table 2-31. Numeric Code for Calibration Setting

Calibration Setting Numeric Code

CAL PULSE 0 DEG 101

CAL PULSE 24 DEG 102

Fetal / Maternal ECG (Option)

The MPS450 simulates a combined fetal and maternal electrocardiogram (ECG)

occurring during labor, as well as a selection of pressure waveforms produced by uterine

contractions. The contraction period is adjustable and includes a manually generated

waveform.

The maternal ECG is always a normal sinus rhythm with a heart rate of 80 BPM; the fetal

heart rate is either fixed (to a selection from seven settings), or periodic, which is

interactive with uterine contractions. The simulated fetal heart rate represents a

measurement from a fetal scalp electrode, while the simulated maternal heart rate

represents a measurement from an electrode on the mother’s thigh.

The MPS450 simulates the fetal / maternal ECG on its regular ECG leads. The maternal

signal is a P-QRS-T wave fixed at 80 BPM, at half the selected ECG amplitude; the fetal

signal is a narrow R wave at full amplitude. Fetal and maternal signals are summed to

make a composite signal.

The simulated intrauterine-pressure (IUP) waveform represents a measurement taken by

an intra-amniotic catheter connected to a pressure transducer. The MPS450 simulates the

IUP on its BP4 blood-pressure channel, the same as if it were a blood-pressure

transducer, either at 5 or 40 μV/V/mmHg sensitivity (as has been set up for blood

pressure).

The MPS450 does not provide simulations for all types of fetal heart rate tracings and

contraction patterns. A few examples of simulation not provided are:

• Variable decelerations

• Sinusoidal pattern

• Reactive tracing

• Variations in FHR variability

• Tachysystole

Simulating a Fixed Fetal Heart Rate (Fhr)

The MPS450 simulates seven preconfigured settings (BPM) for a fetal heart rate that is

fixed: 60, 90, 120, 140, 150, 210, or 240.

Action in the Menu-Control Mode

1. Press the top-menu key labeled MORE to display the following LCD screen:

gje039.eps

2. Select FETAL MATR to display the following LCD screen:

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Fluke-biomedical MPS450 User Manual Page 71