Patient Monitor User Manual Monitoring ECG
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X0.25: make size of ECG signal waveform of 1mV become 2.5 mm;
X0.5: make size of ECG signal waveform of 1mV become 5 mm;
X1: make size of ECG signal waveform of 1mV become 10 mm;
X2: make size of ECG signal waveform of 1mV become 20 mm;
X4: make size of ECG signal waveform of 1mV become 40 mm;
AUTO: let the monitor choose the optimal adjustment factor for all the ECG waves.
NOTE:
The effect of ECG wave gain is subject to the size of the wave area. Whichever wave
gain is chosen, the ECG wave has to be displayed within the wave area, the exceeded
part is clipped.
8.3.2 Changing the ECG Filter Settings
The ECG filter setting defines how ECG waves are smoothed. An abbreviation indicating the
filter type is shown underneath the lead label on the monitor display. Filter settings do not affect
ST measurement.
To change the filter setting, in the ECG Setup menu, select Filter and then select the appropriate
setting.
– Monitor: Use this mode under normal measurement conditions.
– Surgery: The filter reduces interference to the signal. It should be used if the signal is
distorted by high frequency or low frequency interference. High frequency interference usually
results in large amplitude spikes making the ECG signal look irregular. Low frequency
interference usually leads to a wandering or rough baseline. In the operating room, the Filter
reduces artifacts and interference from electro-surgical units. Under normal measurement
conditions, selecting Surgery may suppress the QRS complexes too much and thus interfere with
the clinical evaluation of the ECG displayed on the monitor.
– Diagnosis: Use when undistorted signal is required and its own characteristics can be
maintained. The waveform filtered by the bandwidth of 0.05 Hz~150 Hz is displayed so that the
actual changes such as R-wave notching or discrete elevation or depression of the ST segments
are visible.
8.4 Selecting Calculation Lead
To set the calculation lead, select ECG Setup > Calc. Lead, or on the Normal display interface,
click on the calculation lead waveform area, select Calc. Lead from the popup interface to make
the appropriate setting. For 3 Leads, II, I, and III are selectable; For 5 Leads, II, I, III, aVR, aVL,
aVF, and V are selectable; For 12 Leads, II, I, III, aVR, aVL, aVF, V1, V2, V3, V4, V5, and V6
are selectable. Normal QRS complex should be:
The normal QRS should be either completely above or below the baseline and it should not
be biphasic. For paced patients, the QRS complexes should be at least twice the height of
pace pulses.
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