Concentric needle jitter in stimulated frontalis in 20 healthy subjects

Authors

  • João A. Kouyoumdjian MD, PhD,

    Corresponding author
    1. Department of Neurological Sciences, Neuromuscular Investigation Laboratory, Faculdade de Medicina de São José do Rio Preto (FAMERP), São Paulo, Brazil
    • Faculdade de Medicina de São José do Rio Preto, Rua Luiz Antônio da Silveira 1661, 15025-020 São Paulo, Brazil
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  • Erik V. Stålberg MD, PhD

    1. Department of Clinical Neurophysiology, University Hospital, Uppsala University, Uppsala, Sweden
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Abstract

Normative data for jitter parameters using a disposable concentric needle have been presented in a few studies. Jitter, expressed as the mean consecutive difference (MCD), was measured in the frontalis muscle in 20 subjects by percutaneous bar stimulation of the temporal nerve branch. The mean MCD for individual studies (20) and for all potentials (600) were 16.05 ± 2.73 μs and 16.05 ± 5.96 μs, respectively. The suggested limit for mean MCD is 22 μs and for outliers is 28 μs. Muscle Nerve, 2012

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