Supplement – Infinity M300 and M300+ Series – VG2.4 11
Infinity M300/M300+ Features for VG2.4
To set the QRS Threshold using earlier ICS and M300 versions
For ICS 2.1 or earlier, or M300 VG2.3 or earlier, from the Main ICS screen:
1 Click System setup on the ICS.
2 Click Layouts.
3 Click the dropdown arrow of the appropriate Gain/Scale Channel.
4 Select the appropriate Gain value:
– Select a value of 1,2,4 or 8 mV/cm to set the QRS threshold to Normal.
– Select a value of 0.5 or 0.25 mV/cm to set the QRS threshold to Low.
QRS dectection amplitude
QRS detection amplitude: 0.5 to 5.0 mVp-v RTI
QRS threshold detection duration:
Adult: 70 to 120 ms
Pediatric: 40 to 120 ms
Configuring the QRS threshold to Low may extend the QRS detection amplitude to as low as 0.17 mVp-
vRTI.
ECG QRS processing settings
WARNING
Risk of inaccurate HR value. If the QRS setting is set to Low in the presence of HR artifact, the
associated HR value may be inaccurate.
To avoid an inaccurate HR value, it is recommended to set the QRS threshold setting to Normal.
Gain/Scale column mV/cm Detection threshold
For all ECG waveforms: 0.25, 0.5, 1 (de-
fault), 2, 4, 8 mV/cm
The M300/M300+ uses an AAMI-compliant
regular QRS threshold when you select a
scale of 1, 2, 4, or 8 mV/cm. If you select a
scale of 0.25 or 0.5 mV/cm, the
M300/M300+ lowers the detection thresh-
old, and the AAMI requirement is not met.
8 >
0.35 mV
4>
0.35 mV
2>
0.35 mV
1>
0.35 mV
0.5 >
0.17 mV
0.25 >
0.17 mV
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