S12 Vet Monitor User’s Manual
8-17
Arrhythmia Events Description
Bigeminy Dominant rhythm of N, V, N, V.
Trigeminy Dominant rhythm of N, N, V, N, N, V.
Frequent PVCs The number of PVC per minute is greater than the decision limit.
PVC Occasional ventricular premature beat.
Missed Beat
No heartbeat is detected within 1.75× of the average R-R interval
(when the heart rate is less than 100bpm), or no heartbeat is detected
within 1 second (when the heart rate is more than 100bpm) and the
current RR interval is less than 4 seconds.
A-Fib RR interval of normal cardiac beats is irregular and there is no P wave.
A-Fib End No atrial fibrillation was detected within the delay time after the end of
atrial fibrillation.
ECG Noise There is too much noise to analyze the waveform.
Irregular Rhythm Always an irregular rhythm.
Irregular Rhythm End No irregular rhythm was detected within the delay time after the end of
the irregular rhythm.
8.6.3. Arrhythmia alarm settings
Use the following steps to set arrhythmia related alarms:
1. Select ECG parameter area or waveform area to enter 【ECG】 menu.
2. Select 【ARR】 submenu→【Alarm】 submenu.
3. If the arrhythmia setting is protected by a password, enter the password. For
details, please refer to 7.6.2 Changing Alarm Setup Protection Mode.
4. Set each arrhythmia alarm as required.
NOTE
：
The alarm level for lethal arrhythmia is always high and cannot be
changed by the user.
8.7. ST Monitoring
ST segment of ECG waveform refers to the phase from the end of ventricular
depolarization to the beginning of ventricular repolarization, or from the end of QRS
complex (point J) to the beginning of T wave. ST segment analysis is mostly used to
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