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).
As an example, this diagram illustrates the conditions under which PVC alarms would be generated if
the Vent Rhythm Run limit is set to 11, the V-Tach Run Limit is set to 8, 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
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.
About ST Monitoring
The monitor performs ST segment analysis on normal and atrially paced beats and calculates ST
segment elevations and depressions. This information can be displayed in the form of ST numerics and
snippets on the monitor.
The monitor also performs ST Elevation (STE) analysis using automated ISO and J point
determination and measuring the ST segment directly at the J point (J +0). This is based on the
recommendations for measuring ST Elevation published by the American Heart Association, the
American College of Cardiology and the European Society of Cardiology.
All available leads can be monitored continuously. The ECG waveform does not need to be displayed
on the monitor for ST Segment analysis.
ST analysis is always performed using a dedicated filter which ensures diagnostic quality. If you are
monitoring ECG using an ECG filter mode other than Diagnostic, the ST segment of the ECG wave
may look different from the ST segment of the ST snippet for the same wave. For diagnostic
evaluation of the ST segment, always switch to Diagnostic filter mode or use the ST snippet.
6 ECG, Arrhythmia, ST and QT Monitoring