BeneVision N22/N19 Patient Monitor Operator’s Manual 10 - 11
10.5.7 Adjusting the QRS Threshold
To avoid false asystole alarm due to low R wave amplitude, and to avoil tall T waves and P waves being mistaken
for QRS complex, the monitor provides the function of adjusting the QRS threshold.
To adjust the QRS threshold, follow this procedure:
1. Select the ECG numeric area or waveform area to enter the ECG menu.
2. Select the QRS Threshold tab.
3. Select the arrow buttons to adjust the QRS threshold. Selecting Default resets the QRS threshold to the
default value (0.16 mV).
• The setting of QRS threshold can affect the sensitivity of arrhythmia, ST, QT/QTc detection, and heart
rate calculation.
• If QRS amplitude is low, the monitor might not be able to calculate heart rate and false asystole may
occur.
• You can adjust QRS threshold only when the ECG filter is set to Monitor.
10.6 Monitoring Arrhythmia
Arrhythmia monitoring is intended for adult, pediatric, and neonatal patients.
10.6.1 Arrhythmia Safety Information
• Heart rate reading may be affected by cardiac arrhythmias. Do not rely entirely on heart rate alarms
when monitoring patients with arrhythmia. Always keep these patients under close surveillance.
• The arrhythmia analysis program is intended to detect ventricular arrhythmias and atrial
fibrillation. It is not designed to detect atrial or supraventricular arrhythmias. It may incorrectly
identify the presence or absence of an arrhythmia. Therefore, a physician must analyze the
arrhythmia information with other clinical findings.
• Atrial fibrillation (Afib) detection function is not intended for pediatric and neonatal patients.
• Since the arrhythmia detection algorithm sensitivity and specificity is 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 QRS threshold settings affect arrhythmia detection and heart rate calculation
sensitivity.
• If QRS amplitude is low, the monitor might not be able to calculate heart rate and false asystole may
occur.
• During the learning phase of the algorithm, arrhythmia detection may not be available. So you
should closely monitored the patient condition during and for several minutes after the learning
phase to allow the algorithm to reach optimal detection performance.
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