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Qt Alarms - Philips MX400 Instructions For Use Manual

Intellivue series patient monitors.
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6 ECG, Arrhythmia, ST and QT Monitoring
To set the baseline,
Select
If no baseline has been set for this patient, the first five minute value after the start of monitoring is
automatically set as baseline. If you set a new baseline the previous baseline is discarded. As the ΔQTc
alarm is based on the difference between the baseline and the current value, setting an inappropriate
new baseline may prevent a ΔQTc alarm from being generated. Discharging a patient clears the
baseline.
Printing The QT Waves
To start a printout,
Select
Recording The QT Waves
To start a recording,
Select

QT Alarms

There are two QT alarms, QTc high limit alarm and ΔQTc high alarm. The QTc high limit alarm is
generated when the QTc value exceeds the set limit for more than 5 minutes. The ΔQTc alarm is
generated when the difference between the current value and the baseline value exceeds the set limit
for more than 5 minutes.
Cannot Analyze QT
The
calculated for 10 minutes. Up to this time the previous valid value will be displayed. The following
additional messages on the cause of the invalid measurements may also be displayed.
Additional Message
QT Startup
Asystole or Leads Off
Too few N labeled beats
Invalid Rhythm for QTc
High QT-HR
Small R Wave
Small T Wave
End of T not Detected
QT out of Range
QTc out of Range
QTc Erratic
178
Set Baseline
and set the value.
Print QT
.
Record QT
.
INOP and the -?- will be displayed when no QT measurement could be
Cause of Invalid QT Measurement
QT monitoring was just turned on or has been reset
1
2
Not enough valid QRS complexes to generate a QT measurement
Not enough valid RR intervals to generate QT-HR, the averaged HR
used for QTc calculation
QT-HR exceeds the specified upper limit of 150 bpm (for adults) or
180 bpm (for neonates and pediatrics)
R-wave of the signal is too small
T-wave of the signal is too small
End of the T-Wave cannot be accurately detected
QT measurement is outside the specified range of valid QT values
(200-800 msec)
QTc measurement is outside the specified range of valid QTc values
(200-800 msec)
QTc measurements are not stable
Not all specified leads needed to perform QT analysis are
available, or
Asystole condition is detected

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