ST/AR is a powerful algorithm for ST segment and arrhythmia analysis. The arrhythmia monitoring algorithm processes ECG signals from single or multiple leads on adult, pediatric, and neonatal patients. The ST segment algorithm analyzes up to 12 leads of ST segment snippets in adult patients.
The ST/AR algorithm is integrated into a wide range of Philips ECG monitoring systems—from our high-acuity patient monitors to telemetry to the IntelliVue Information Center.
Arrhythmia analysis
The ST/AR algorithm provides real-time arrhythmia detection with innovative features, including:
- Patented process for continuous monitoring of ECG signal quality across all leads
- Applying two independent digital filters: one to enhance QRS detection, the other for classification
- Combined feature extraction and template matching for more precise classification of QRS complexes
- Patented algorithms for pace pulse analysis and pace beat classification
- Rapid learning—only 15 beats required for recognition of dominant rhythm
- Identification of 22 alarm conditions, grouped by priority
- Specialized neonatal arrhythmia monitoring
- Comprehensive trending
Users can configure most alarm limits and minimum detection thresholds. ST/AR is a ventricular oriented algorithm; however, the algorithm is also capable of detecting a number of atrial arrhythmias such as SVT and atrial fibrillation with variable ventricular response (indicated as irregular heart rate).
ST segment analysis
The ST segment algorithm documents ST segment changes in adult patients, which can indicate the severity and duration of myocardial ischemia. Since many ischemic episodes are silent or painless, continuous monitoring of ST segment changes can provide the earliest warning of ischemic events.
Our algorithm analyzes up to 12 ECG leads. Beat detection and classification information provided by the arrhythmia algorithm is used to eliminate beats that are ventricular in origin and ventricular paced beats from the analysis. All other complexes are measured, including atrial paced complexes.
Other features include:
- Filter for erroneous ST segment measurements when determining median ST valve, reducing false alarms
- User-adjustable isoelectric point and J-point
- Separate ST alarm detection for each lead
- ST Index, derived by summing absolute values of V2, V5, and aVF
- Trending of ST values and associated waveforms