Key result
An amplifier input impedance exceeding 3 GΩ and a cutoff frequency no higher than 0.05 Hz are necessary to meet IEC 60601 performance criteria and avoid ECG signal distortion.
Why the study?
The study investigated the transient response of ECG amplifiers relative to the IEC 60601 performance standard for electrocardiographs.
ECG amplifiers require an input impedance exceeding 3 GΩ and a cutoff frequency ≤ 0.05 Hz to meet IEC 60601 performance criteria and avoid signal distortion.
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Clinicians must verify ECG amplifier specs to preserve signal integrity; leaves open prospective validation of distortion effects on diagnostics.
Maji et al. (2019) studied this question. Amplifier input impedance > 3 GΩ and cutoff frequency ≤ 0.05 Hz vs. Recommended input impedance of 10 MΩ was evaluated on IEC 60601 performance criteria (undershoot limit and recovery slope limit). An amplifier input impedance exceeding 3 GΩ and a cutoff frequency no higher than 0.05 Hz are necessary to meet IEC 60601 performance criteria and avoid ECG signal distortion.
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