GE HEALTHCARE B20, User'S Reference Manual

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ECG
11-15
for several minutes after the learning phase to allow the algorithm to reach optimal
detection performance.
About the arrhythmia detection
When an ECG signal is detected at the start of monitoring, the arrhythmia detection algorithm
begins acquiring and analyzing QRS complexes in the leads used for arrhythmia detection. This
phase is known as learning. Once learning is complete, the dominant QRS complex is stored as
a reference template. Reference template is used as a normal morphology of that patient and
it is compared with incoming beats to identify possible arrhythmias.
The EK-Pro arrhythmia detection algorithm is used. EK-Pro simultaneously analyzes leads I, II,
III, and V. Once learning is complete, the dominant QRS complex becomes the template.
The algorithm uses continuous correlation, incremental template updating and contextual
analysis. Continuous correlation attempts to find the best match between each incoming
complex and the set of stored (learned) templates. If no match is found with the existing
template, a new template is stored for the identified new QRS shape. Incremental template
updating allows information from each beat, that correlates over time, to be reflected in the
associated template. Contextual analysis uses information from neighboring QRS complexes
along with existing template measurements to make the best possible decision regarding the
beat’s origin (e.g., early, wide).
NOTE: With the 3 leadwire trunk cable, the algorithm uses the only one available lead
ECG1 Lead , which is I, II or III, depending on the selected user lead.
Starting relearning manually
When the patient’s ECG pattern changes considerably, the monitor should start relearning a
new ECG pattern. The pattern changes, for example, when changing the patient’s position. To
start relearning manually:
1.
Press the
ECG
key.
2. Select Relearn .
ECG