ST/AR Arrhythmia Monitoring
ST/AR Arrhythmia Algorithm
Indications for Use
The ST/AR Arrhythmia Algorithm is indicated for use in instances where
the clinician decides to monitor cardiac arrhythmias of adult and pediatric
patients and/or the ST segment of adult patients to gain information for
treatment, monitor the adequacy of treatment, or to exclude causes of
How the ST/AR Algorithm Works
ST/AR multi-lead analysis is performed on the user-selected primary and
secondary leads. If only one lead is available for multilead, ST/AR analysis
is performed on the single available lead.
Arrhythmia analysis consists of several steps:
The ECG signal is pre-processed to filter out baseline wander, muscle
artifact, and signal irregularities. In addition, if the Patient Paced status
= Yes, pace pulses are detected then rejected from the processing to
avoid seeing them as QRS beats.
Beat detection to locate the QRS complexes for further analysis.
Feature measurement such as R-wave height, width, and timing.
Beats classification. Templates are created and are matched to incoming
beats, and the appropriate beat label is determined.
Rhythm and alarm detection. Beat labels are used to produce the values
and events needed to generate rhythms and alarms.
Working in parallel with beat detection and classification, a separate
detector examines continuously for ventricular fibrillation, asystole, and
The quality of the ECG signal is important for accurate arrhythmia analysis.
The section below provides guidelines for optimizing signals for
For additional information on the ST/AR Algorithm, refer to the
Arrhythmia Monitoring ST/AR Algorithm Application Note,
ECG and Arrhythmia Monitoring