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• Since the arrhythmia detection algorithm sensitivity and specificity are less than 100%, sometimes
there may be some false arrhythmias detected and also some true arrhythmia events may not be
detected. This is especially true when the signal is noisy.
• The ECG size and minimum QRS detection threshold settings affect arrhythmia detection and heart
rate calculation sensitivity.
• If QRS amplitude is low, the equipment might not be able to calculate heart rate and false asystole
calls may occur.
• During the learning phase of the algorithm, arrhythmia detection may not be available. So you
should closely monitor patient condition during and for several minutes after the learning phase to
allow the algorithm to reach optimal detection performance.
11.5.2 Changing Arrhythmia Settings
11.5.2.1 Changing Arrhythmia Alarm Settings
• You can switch off lethal arrhythmia alarms only when you Lethal Arrhys Alarm Off is switched on.
For more information, see 11.5.2.2Setting the Switch of Lethal Arrhythmia Alarms.
• The priority of lethal arrhythmia alarms is always high. It cannot be changed.
11.5.2.2 Setting the Switch of Lethal Arrhythmia Alarms
• If you switch off all arrhythmia alarms, the equipment will not alarm for any arrhythmia event. This
may result in a hazard to the patient. Always keep the patient under close surveillance.
• If any of the lethal arrhythmia alarms is switched off, the message “Lethal Arrhys Off” is displayed in
the ECG waveform area.
11.5.2.3 Changing Arrhythmia Alarm Threshold Settings
• The asystole delay time relates to ECG relearning. When heart rate is less than 30 bpm, it is
recommended to set Asystole Delay to 10 sec.
11.5.2.4 Arrhythmia Shielding Period
• The arrhythmia shielding period has no impact on HR High, HR Low, Tachy, Brady, A-Fib End, Irr
Rhythm End.
• The arrhythmia shielding period is only applicable to the alarms in the medium priority chains and
atrial fibrillation chain. For the alarms in the high priority chain, alarm tone and alarm lamp are
presented as soon as the alarm condition is detected.
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