Abstract
The routine needle EMG examination is usually performed by observing the waveforms on the display screen and listening to their sound. It is subjective. Quantitative analysis (QA) is considered time consuming and not used. In this workshop, I will describe the “objective and interactive” approach. It adds elements of QA to record and measure EMG signals. It does not add time for analysis, and provides quantitative data to document abnormalities. The techniques of recording and measurements will be demonstrated. This includes use of dual time base, amplitude trigger, cascaded traces, etc. The “quality” control of the recording will be emphasized. The various signal displays help better assessment of amplitude, duration, phases, turns, stability, and firing rate of motor unit potentials (MUPs). It is also useful to assess the fullness of the interference pattern and its amplitude. The additional information captured by this approach will improve the quality of the needle EMG examination. Finally, I will demonstrate the fully automated methods for MUP analysis (Multi-motor unit analysis) and IP (Turns & amplitude). This requires just a few minutes per muscles. Using modern algorithms, QA is not time consuming. It should be included in the laboratory routine.
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