Continuous monitoring of electrode-skin impedance mismatch during bioelectric recordings.
basic_science · Level V
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- Record sourced from PubMed, PMID 18714835.
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Abstract
In bioelectric recordings, an electrode-skin impedance mismatch leads to a reduced common-mode rejection ratio (CMRR) of the amplifier. For this reason, the impedance of each individual electrode-skin contact is usually measured prior to a recording. The measurement circuit itself degrades the CMRR and is switched off during the bioelectric recording. In this paper, we present a new method that allows to monitor the electrode-skin impedance in a continuous way without reducing the CMRR of the amplifier. The new method is based on an additional common-mode signal that is superimposed on the bioelectric signal.
Medical subject headings
- Algorithms
- Computer-Aided Design
- Electrocardiography, Ambulatory
- Electrodes
- Models, Biological
- Skin Physiological Phenomena