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Arrhythmia detection
NOTE: The VSP-C software only supports severe analysis, which
detects asystole, bradycardia, tachycardia, ventricular fibrillation,
and ventricular tachycardia.
Warnings
•
LOSS OR DETERIORATION OF ARRHYTHMIA DETECTION -
Automated arrhythmia analysis programs may incorrectly
identify the presence or absence of an arrhythmia. A physician
must therefore interpret the arrhythmia information in
conjunction with other clinical findings. Please take special note
of the following ECG waveform conditions:
−
Noisy waveforms. Noisy portions of ECG waveforms are
typically excluded from analysis. The exclusions are
necessary to reduce the occurrence of inaccurate beat
interpretations and/or rhythm alarms. If the excluded noisy
portions of the ECG waveform contain true arrhythmia
events, those events may remain undetected by the system.
−
Beat amplitude and duration. Accurate detection and
interpretation of beats becomes increasingly difficult as the
amplitude and/or duration of those beats approach the
design limits of the analysis program. Thus, as beats become
extremely wide or narrow, or especially as beats become
small, arrhythmia interpretation performance may degrade.
−
Other morphology considerations. Automated arrhythmia
detection algorithms are designed fundamentally to detect
significant changes in QRS morphology. If an arrhythmia
event is present and does not exhibit a significant change
from the patientís predominant morphology, it is possible for
those events remain undetected by the system.
•
SUSPENDED ANALYSIS - Certain conditions suspend arrhythmia
analysis. When suspended, arrhythmia conditions are not
detected and alarms associated with arrhythmias do not occur.
The messages which alert you to the conditions causing
suspended arrhythmia analysis are: 'Arrhythmia Paused', 'Leads
off' and 'Patient discharged'.
•
Always monitor ECG for arrhythmia detection purposes. HR
calculated from pulsatile SpO
from ECG HR measured values. Users should be aware that the
"SpO2 probe off" and "No SpO2 pulse" technical alarms escalate
no higher than a Medium priority.
•
Artifact and arrhythmia paused alarm - The artifact and
arrhythmia paused alarm indicates that the system is no longer
monitoring ECG and there may be no Tachy or Brady alarms.
About 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
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waveform may differ significantly
2
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