Data Critical Corporation 02DT-7000 User Manual
TROUBLESHOOTING
PatientNet Operator’s Manual, v1.04, 10001001-00X, Draft
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6. What are false positive calls?
A false positive call is one where an event was labelled as an arrhythmia when it was
not. It is most often seen when artifact appears to be an arrhythmia and is called such
by the computerized detector.
not. It is most often seen when artifact appears to be an arrhythmia and is called such
by the computerized detector.
7. What are false negative calls?
A false negative call is one where the algorithm misses an actual arrhythmia event.
8. Why are arrhythmia events annotated in different leads on different full
disclosure printouts?
After the dominant normal beat is identified, the primary analysis lead is determined.
The software always monitors both leads, however, for most decisions, only the pri-
mary lead is used.
After the dominant normal beat is identified, the primary analysis lead is determined.
The software always monitors both leads, however, for most decisions, only the pri-
mary lead is used.
Note:
The primary analysis lead is indicated on the full disclosure display as the
annotated lead.
annotated lead.
9. How does the beat classifier work?
The beat classifier has two modes of operation: learning and analysis. In the analysis
mode, the beat classifier compares incoming beats to the learned dominant “normal”
template and decides if the beat is normal, premature atrial beat, or ventricular com-
plex.
mode, the beat classifier compares incoming beats to the learned dominant “normal”
template and decides if the beat is normal, premature atrial beat, or ventricular com-
plex.
10. How are pacemaker beats annotated by the detector?
The arrhythmia software looks at the location of the pacer flag in relation to the
detected beats to determine if a beat is paced. Paced beats will always be called nor-
mal (N) or aberrant normal (q or Q) by the detector. The arrhythmia software performs
best when the patient’s dominant rhythm is learned as the normal beat.
detected beats to determine if a beat is paced. Paced beats will always be called nor-
mal (N) or aberrant normal (q or Q) by the detector. The arrhythmia software performs
best when the patient’s dominant rhythm is learned as the normal beat.
11. Can the ECG signal be improved for better arrhythmia detection by
increasing the size or gain?
No. Increasing the size of the ECG will not improve the signal. The gain increase only
serves to help the clinician better see the ECG. The only way to improve signal quality
is to change the lead you are monitoring, or move the electrodes closer to the patient’s
heart (the signal source).
No. Increasing the size of the ECG will not improve the signal. The gain increase only
serves to help the clinician better see the ECG. The only way to improve signal quality
is to change the lead you are monitoring, or move the electrodes closer to the patient’s
heart (the signal source).