Patient Monitor User Manual Monitoring ECG
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the wrong classification. Ventricular heartbeat should have a different appearance from “normal
heartbeat”. Physicians should be more alert to these patients.
NOTE:
1 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.
2 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.
3 The ventricular HR mentioned above refers to:
In Basic ARR, when the consecutive PVCs number ≥ 5, the algorithm calculates
ventricular HR with the average of 4-8 RR intervals.
In Advanced ARR, when the consecutive PVCs number ≥ 3, the algorithm
calculates ventricular HR with the average of 2-8 RR intervals.
The methods are different from the HR Averaging Method of the monitor. Therefore,
the ventricular HR values calculated by Basic /Advanced algorithm may be different
from the HR values calculated by HR Averaging Method. The ventricular HR is for
judging arrhythmias and is not exactly equal to the HR displayed on the interface.
4 The ARR analysis results and HR values obtained during ARR analysis and HR
calculation are not affected by the selected filter mode. The algorithm itself has
independent data-flow processing, which can better ensure the consistent and
accurate results in different filter modes.
5 Atrial fibrillation alarm should meet below two conditions for 1 minute:
The RR interval of normal beats must be irregular,
It can be seen that the obvious f or P waves do not exist.
6 Atrial fibrillation analysis is only applicable to adult patients and should not be
performed for PVC or pacing fluctuations.
7 Atrial flutter cannot be detected by the atrial fibrillation algorithm because most of
their RR intervals are regular.
8 In following situations, atrial fibrillation alarm detection error may occur:
Sinus arrhythmia
Atrioventricular block
Frequent ventricular premature beats
Myoelectric interference
Electrode motion artifact
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