GE Novii, Руководство по клиническому применению

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7
How Novii Works
Novii electrodes work in pairs to create channels that detect the
Fetal ECG, Maternal ECG and electromyography (EMG) signals from
the uterine muscle.
• Electrode 4 is the ground electrode and important for reducing
electrical noise from the body
• Electrode 5 is most critical for FHR
• Electrode 3 is most critical for UA
Minimal Confusion – the mECG and fECG are simultaneously monitored
and their size and shape make them distinctly different allowing them to
be easily separated to avoid confusion.
Accuracy – Novii uses the R-R intervals of the ECG waveform to calculate
the FHR and MHR.
Noise – when electrophysiological noise from the body or electrical
noise from the environment becomes too big it will hide the very small
fECG signal from being detected, and the FHR will be lost. Techniques
to minimize electrical noise will improve FHR detection, see FHR
Troubleshooting Page 17.
Novii processes the EMG signals from the myometrium and coverts
them in to the typical bell shaped curve contractions. Novii is able to
distinguish between smooth and striated muscle activity, therefore
pushing, coughing, vomiting, and fetal kicks will not be reflected
on Novii UA.
During labor, Novii accurately and reliably displays contraction frequency
and timing of contraction nadir. Novii does not display a measurable
contraction strength or resting tone. Contraction duration may differ
slightly as compared to TOCO & IUPC. Use uterine palpation to confirm,
as per standard practice with other UA monitoring devices.
2
1
3
5
ECG Channels (FHR/MHR)
2
4
1 3
5
EMG Channels (UA)
EMG
Novii UA
IUP
TOCO
mECG
fECG
Noise
Maternal
R-R
Fetal
R-R
4