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Download fileDuration of observation required in detecting fasciculation potentials in amyotrophic lateral sclerosis using high-density surface EMG
journal contribution
posted on 2013-12-06, 00:00 authored by Ping Zhou, Xiaoyan Li, Faezeh Jahanmiri-Nezhad, William Zev Rymer, Paul E. BarkhausBackground: High-density surface electromyography (HD-SEMG) has recently emerged as a potentially useful tool
in the evaluation of amyotrophic lateral sclerosis (ALS). This study addresses a practical constraint that arises when
applying HD-SEMG for supporting the diagnosis of ALS; specifically, how long the surface EMG should be recorded
before one can be confident that fasciculation potentials (FPs) are absent in a muscle being tested.
Methods: HD-SEMG recordings of 29 muscles from 11 ALS patients were analyzed. We used the distribution of
intervals between FPs, and estimated the observation duration needed to record from one to five FPs with a
probability approaching unity. Such an approach was previously tested by Mills with a concentric needle electrode.
Results: We found that the duration of recording was up to 70 s in order to record a single FP with a probability
approaching unity. Increasing recording time to 2 minutes, the probability of recording five FPs approached
approximately 0.95.
Conclusions: HD-SEMG appears to be a suitable method for capturing FPs comparable to intramuscular needle
EMG.