Needle Electrode
A recording electrode inserted into muscle tissue for electromyography, available in monopolar and concentric configurations for different clinical applications.
Full Definition
A needle electrode is a specialized recording device used in electromyography to detect electrical activity within muscle tissue. Two main types are commonly used: monopolar needles, which record from the tip against a distant reference electrode, and concentric needles, which have both recording and reference surfaces within the same shaft. Monopolar needles provide better pickup of distant activity but may record more artifact, while concentric needles offer more selective recording with less artifact but potentially miss distant signals. Proper electrode selection and insertion technique are crucial for obtaining high-quality recordings and avoiding complications such as pneumothorax when examining intercostal or diaphragmatic muscles.
Usage
Usage note: Hyphenate when used as a compound modifier.
In Context
- "A concentric needle electrode was used for all recordings." — EMG methodology
- "The needle electrode was positioned in the lateral gastrocnemius muscle." — EMG procedure note