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F ECG Analysis Algorithm
Patient Analysis System
The iAED-S1 Patient Analysis System ensures that the pad/patient impedance
is within the proper range and analyzes the patient’s ECG rhythm to determine
whether a shock is required. In the initial ECG signal conditioning stage,
baseline wander and high-frequency noise is removed from the ECG signal
and the ECG signal is digitized. In the ECG signal processing stage, artifacts is
identified and removed from the patient’s ECG signal (artifacts may arise from
a variety of sources, including: noise, patient motion, respiration, muscular
contractions, and pacemakers).
Rhythm analysis system consists of a number of parameters for making the
ECG rhythm analysis, including ECG signal amplitude, consistency, period,
spectrum etc.
Rhythm analysis is based on continuous segment of 3s ECG data. It needs at
least three such ECG data segments to make a final shock or no-shock
decision.
Shock Rhythm Criteria
When the patient's symptoms are consistent with suggested criteria, the
iAED-S1 is designed to recommend a defibrillation shock when it detects
proper pad impedance and the patient's rhythm for any one of the following
table:
Ventricular
fibrillation
Peak-to-peak amplitude reaches at least 200 µVolts
Warning: Some very low amplitude or low frequency VF
rhythms may not be interpreted as shock.
Ventricular
tachycardia
Cardiac rhythm rate reaches at least 180 bpm and
peak-to-peak amplitude reaches at least 200 µVolts.
Warning: Some very low amplitude or low frequency VT
rhythms may not be interpreted as shock.
Implantable pacemaker pulse signals may affect the correct determination of
arrhythmia.