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Electrodes: Overview01:17

Electrodes: Overview

Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in the...

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Jitter recordings with concentric needle electrodes.

Erik V Stålberg1, Donald B Sanders

  • 1Department of Clinical Neurophysiology, University Hospital, Uppsala, S-751 85 Sweden. stalberg.erik@gmail.com

Muscle & Nerve
|August 26, 2009
PubMed
Summary
This summary is machine-generated.

Disposable concentric needle (CN) electrodes offer a viable alternative for measuring neuromuscular jitter when single fiber (SF) electromyography electrodes are unsuitable. While CN electrodes may slightly underestimate jitter, they facilitate its analysis for clinical use.

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Area of Science:

  • Neurology
  • Neurophysiology

Background:

  • Neuromuscular jitter is typically assessed using single fiber (SF) electromyography (EMG).
  • Concerns regarding reusable needle electrodes have prompted a search for alternatives.
  • Disposable concentric needle (CN) electrodes are being investigated as a potential substitute for SF electrodes.

Purpose of the Study:

  • To review the challenges and viability of using disposable concentric needle (CN) electrodes for measuring neuromuscular jitter.
  • To compare jitter measurements obtained with CN electrodes to those from SF EMG.

Main Methods:

  • Review of existing literature and methodologies for measuring neuromuscular jitter.
  • Analysis of signal characteristics and potential artifacts when using CN electrodes.
  • Comparison of reference values obtained with CN electrodes versus SF EMG.

Main Results:

  • Signals recorded with CN electrodes can be summations of multiple single fiber action potentials, potentially reducing apparent jitter.
  • The analysis method influences the impact of these summation artifacts.
  • Reference values from CN electrodes correlate with SF EMG values but are typically a few microseconds lower.

Conclusions:

  • Disposable CN electrodes represent a practical alternative to SF EMG for jitter analysis, enhancing its clinical applicability.
  • Results from CN electrodes should be interpreted cautiously, especially in borderline cases.
  • The CN electrode method is acceptable for clinical use when SF electrodes are not feasible.