Product Manual

Patient Monitor User Manual Monitoring ECG
- 83 -
ARR Alarms
Occurring Condition
Afib
Atrial fibrillation alarm should meet below two conditions for 1 minute:
The RR interval of normal beats must be irregular, and it can be seen that
the obvious f or P waves do not exist.
Acc. Vent
Rhythm
5 consecutive ventricular beats, and 40 bpm ≤ ventricular HR < 100 bpm.
Pause
No QRS is detected within the heartbeat pause threshold value that has
been set.
Pauses/min
High
The measurement value of Pause/min is greater than high alarm limit that
has been set.
VEB
The delayed ventricular beats detected in normal heartbeats occur more
than or equal to 2 times within 30 s.
Multiform
PVCs
Different forms of ventricular premature beats are detected in 15 beats.
IPVC
The single ventricular premature beat between 2 sinus beats with normal
interval occurs more than or equal to 3 times within 30 s.
PAC Bigeminy
The dominant rhythm of N, A, N, A, N, A, and the rhythm number
exceeds the number of threshold value that has been set (N =
supraventricular beat, A = atrial beat).
PAC Trigeminy
The dominant rhythm of N, N, A, N, N, A, N, N, A, and the rhythm
number exceeds the number of threshold value that has been set.
Low
Voltage(Limb)
The signal amplitudes of I, II and III leads shall not exceed alarm
threshold value that has been set. PS: this alarm is available for 5, 6 or 10
electrodes only, not available for 3 electrodes.
NOTE: Arrhythmia monitoring is intended for use with adult patients only and is not
clinically validated for use with neonatal and pediatric patients. For this reason, the
recommended and default setting for arrhythmia monitoring in neonatal and pediatric modes
is
Off
.
Selecting an ECG lead for Arrhythmia:
In arrhythmia monitoring, it is important to select the appropriate lead.
For non-paced patients, the guidelines are:
- QRS should be tall and narrow (recommended amplitude > 0.5 mV)
- R wave should be above or below the baseline (but not biphasic)
- T wave should be smaller than 1/3 of the R wave height
- P wave should be smaller than 1/5 of the R wave height.
For paced patients, in addition to above guidelines, the pacemaker signal should also:
- Not wider than normal QRS
- The QRS complexes should be at least twice the height of the pacing pulse
- Large enough to be detected, without repolarization signal
According to Standard ISO60601-2-27, the minimum detection level of the QRS complex is set
to 0.15 mV, to prevent the detection of P-wave or baseline noise as QRS complexes. Adjusting
ECG displayed waveform size (gain adjustment) won’t influence ECG signals which are used for