ECG Acquisition and Automated Remote Processing by Rajarshi Gupta Madhuchhanda Mitra & Jitendranath Bera

Author:Rajarshi Gupta, Madhuchhanda Mitra & Jitendranath Bera
Language: eng
Format: epub
Publisher: Springer India, New Delhi

4. Recovery: Sudden movement of the patient during ECG procedure can saturate the amplifier output due to high-amplitude input transient pulses. After a small interval, called ‘recovery time,’ the amplifier slowly comes back to the normal condition.

5. Input impedance: This should be sufficiently high so as to ensure that input signal is not attenuated. Most common ECG amplifiers offer an input impedance of 10 MΩ.

6. Electrode polarization: Different varieties of Ag–AgCl electrodes are used for ECG acquisition. The small potential, generated at the electrode–electrolyte interface, is known as half-cell potential. This small DC potential must be considered since it can saturate the INA output, suppressing low-level ECG signal itself. Association for the Advancement of Medical Instrumentation (AAMI) specifies that ECG amplifiers must tolerate a DC component of up to 300 mV resulting in electrode–skin contact.

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