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RHYTHMX® AED ECG ANALYSIS ALGORHITHM
The RhythmX AED ECG analysis algorithm provides superior ECG detection capabilities, allowing it to be placed on
patients at risk for sudden cardiac arrest. The features available with the AED include the following:
• Detection
Rate
• Asystole Threshold
• Noise Detection
• Non-Committed Shock
• Synchronized Shock
• Pacemaker Pulse Rejection
• SVT Discriminators
• Supraventricular Tachycardia (SVT) Rate
DETECTION RATE
All ventricular fibrillation (VF) and ventricular tachycardia (VT) rhythms at or above this rate will be classified as shockable.
All rhythms below this rate will be classified as non-shockable. This rate is configurable between 120 bpm (beats per
minute) and 240 bpm. Service can change this rate using the ServiceLink software. The default Detection Rate is 160
bpm. The Responder AED Pro detection rate is 160 bpm.
ASYSTOLE THRESHOLD
The Asystole baseline-to-peak threshold is set at 0.08 mV. ECG rhythms at or below 0.08 mV will be classified as
Asystole and will not be shockable.
NOISE DETECTION
The AED will detect noise artifact in the ECG. Noise could be introduced by excessive moving of the patient or electronic
noise from external sources like cellular and radiotelephones. When noise is detected, the AED will issue the prompt
“ANALYSIS INTERRUPTED. STOP PATIENT MOTION” to warn the operator. The AED will then proceed to reanalyze
the rhythm and continue with the rescue.
NON-COMMITTED SHOCK
After the AED advises a shock, it continues to monitor the patient ECG rhythm. If the patient’s rhythm changes to a non-
shockable rhythm before the actual shock is delivered, the AED will advise that the rhythm has changed and issue the
prompt “RHYTHM CHANGED. SHOCK CANCELLED.” The AED will enter CPR mode and prompt, “START CPR”.
SYNCHRONIZED SHOCK
The AED is designed to synchronize shock delivery on the R-wave. The AED will automatically attempt to synchronize to
the R-wave. If delivery cannot be synchronized within one second, a non-synchronized shock will be delivered.
PACEMAKER PULSE DETECTION
The AED contains pacemaker pulse detection circuitry to detect pulses from an implanted pacemaker.
SVT (Superventricular Tachycardia) DISCRIMINATORS
The Responder AED Pro is supplied with the SVT Discriminator enabled and with the default setting "NO THERAPY FOR
SVT". With the factory default setting of "NO THERAPY FOR SVT", the Responder AED Pro will not shock an SVT
rhythm.
SVT Discriminators are sophisticated filters that analyze the morphology of the ECG waveforms and distinguish VF/VT
from SVT and Normal Sinus Rhythms (NSR). The SVT Discriminator will only be applied to rhythms that fall between the
Detection Rate and the SVT Rate. The factory default setting for this feature is "NO THERAPY FOR SVT", however
Service can change the settings for this feature using the ServiceLink software.