Key result
Using the previously recommended 10 MΩ input impedance in ECG amplifiers causes signal distortions like false S-wave creation, suggesting input impedance should be as high as 10 GΩ.
Why the study?
The study aimed to establish the input impedance requirements of ECG recording amplifiers based on the electrical properties of surface contact electrodes.
ECG amplifier input impedance should be increased to 10 GΩ to prevent signal distortions like false S-wave creation and S-T segment depression that can lead to clinical misdiagnosis.
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May compromise ECG fidelity with standard amplifiers; leaves open need for clinical validation of higher impedance specs.
Maji et al. (2020) studied this question. Amplifier input impedance of 10 GΩ and ac coupled cut-off frequency ≤0.05 Hz vs. 10 MΩ input impedance was evaluated on Signal distortions (false S-wave creation and depression of the S-T segment). Using the previously recommended 10 MΩ input impedance in ECG amplifiers causes signal distortions like false S-wave creation, suggesting input impedance should be as high as 10 GΩ.
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