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6 ECG, Arrhythmia, and ST Monitoring Arrhythmia Alarms
116
Understanding PVC-Related Alarms
PVC-related alarms are detected on the basis of the current ventricular heart rate and the number of
consecutive PVCs counted (referred to as PVC Runs). Changing one alarm limit automatically changes
linked alarm limits.
Example: This diagram illustrates the conditions under which PVC alarms would be generated if the
Vent Rhythm Run limit is set to 12, the V-Tach Run Limit is set to eight, and the V-Tach HR Limit
is set to 100.
You will see that
• if both the V-Tach Heart Rate Limit and the V-Tach Run Limit are exceeded, a red V-Tach alarm is
generated
• if the ventricular heart rate exceeds the V-Tach Heart Rate Limit but not the V-Tach Run Limit, a
yellow Non-Sustain VT alarm is generated.
Ventricular Heart Rate
Number of Consecutive PVCs (PVC Run)
**Pair
PVCs
PVC =
2
** Non-Sustain
VT
PVC Run < 8
HR > 100
***V-Tach
PVC Run
≥ 8
HR > 100
** Run PVCs
PVC Run > 2
but ≤ 12
HR
≤ 100
** Vent Rhythm
PVC Run > 12
HR
≤ 100
V-Tach
Heart Rate
Limit
V-Tach Run Limit
Ventricular Rhythm
Run Limit
1 2 3 4 5 6 7 8 9 10 11 12
100