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Appropriate window ...
Appropriate window width for the "clustering index method" in the tibialis anterior muscle
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- Sonoo, Masahiro (författare)
- Teikyo Univ, Dept Neurol, Sch Med, Tokyo, Japan.
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- Uesugi, Haruo (författare)
- Aizen Hosp, Dept Med Serv, Sapporo, Hokkaido, Japan.
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- Ogawa, Go (författare)
- Teikyo Univ, Dept Neurol, Sch Med, Tokyo, Japan.
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- Hokkoku, Keiichi (författare)
- Teikyo Univ, Dept Neurol, Sch Med, Tokyo, Japan.
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- Kanbayashi, Takamichi (författare)
- Teikyo Univ, Dept Neurol, Sch Med, Tokyo, Japan.
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- Higashihara, Mana (författare)
- Tokyo Metropolitan Geriatr Hosp, Dept Neurol, Tokyo, Japan.
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- Stålberg, Stefan (författare)
- Stefan Stalberg Software AB, Helsingborg, Sweden.
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- Stålberg, Erik (författare)
- Uppsala universitet,Rostedt Punga: Klinisk neurofysiologi
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Teikyo Univ, Dept Neurol, Sch Med, Tokyo, Japan Aizen Hosp, Dept Med Serv, Sapporo, Hokkaido, Japan. (creator_code:org_t)
- 2020-10-18
- 2021
- Engelska.
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Ingår i: Muscle and Nerve. - : John Wiley & Sons. - 0148-639X .- 1097-4598. ; 63:1, s. 89-95
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We previously reported a new quantitative analysis of single-channel surface electromyography (EMG), the "clustering index method" (CI method), in the tibialis anterior muscle, which achieved sufficiently good sensitivity to detect neurogenic or myogenic abnormalities. The window width is a fundamental parameter of the CI method, and was arbitrarily set at 15 ms in that study. In this study, we searched for the most appropriate window width using expanded patient data. The data from our previous study were reanalyzed, and new patients were enrolled. Window width in the CI method was changed from 5 to 27.5 ms with a step of 2.5 ms. For each window width, Z-score values of individual subjects were calculated and the diagnostic yield was investigated. We enrolled 67 controls, 29 subjects with neurogenic disorders, and 39 with myogenic disorders. When the window width was set at 22.5 ms, the highest sensitivity was achieved both for neurogenic (97%) and myogenic (72%) disorders, with a specificity of 97%. Seven of 10 patients with inclusion body myositis were also abnormal. Reliable results were obtained by collecting 15 epochs per subject. There are two conflicting effects that appear to be best balanced at a window width of 22.5 ms: a wider width decreases the chance that a motor unit potential (MUP) is divided into two adjacent windows, and a narrower width reduces the possibility that an MUP firing at a low-frequency is counted twice by the differential sequences. CI is promising as a non-invasive method to diagnose neuromuscular disorders.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Neurologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Neurology (hsv//eng)
Nyckelord
- clustering index
- myogenic change
- neurogenic change
- surface EMG
- tibialis anterior muscle
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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