Twenty Years of Ictal EEG–EMG

Mothersill, Ian; Hilfiker, Peter

doi:10.1111/j.1528-1157.2000.tb01530.x

Cited by 19 publications

(17 citation statements)

References 9 publications

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“…Visual inspection of surface electromyography (EMG) signals from polygraphic recordings contributed to identifying the pathomechanisms of several seizure‐types: myoclonic (including negative myoclonus), atonic, myoclonic–atonic, epileptic spasms, and startle‐induced reflex seizures (Mothersill et al., 2000). Recording surface EMG signals during seizures proved to provide valuable diagnostic information in the clinical practice: Tassinari et al., (2010) encouraged the use of off‐line analysis of digital polygraphic recordings of epileptic seizures.…”

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confidence: 99%

Patterns of muscle activation during generalized tonic and tonic-clonic epileptic seizures

et al. 2011

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Summary Purpose: Tonic seizures and the tonic phase of tonic–clonic epileptic seizures are defined as “sustained tonic” muscle contraction lasting a few seconds to minutes. Visual inspection of the surface electromyogram (EMG) during seizures contributed considerably to a better understanding and accurate diagnosis of several seizure types. However, quantitative analysis of the surface EMG during the epileptic seizures has received surprisingly little attention until now. The aim of our study was to elucidate the pathomechanism of the tonic muscle activation during epileptic seizures. Methods: Surface EMG was recorded from the deltoid muscles, on both sides, during 63 seizures from 20 patients with epilepsy (10 with generalized tonic and 10 with tonic–clonic seizures). Twenty age‐ and gender‐matched normal controls simulated 100 generalized tonic seizures. To characterize the signal properties we calculated the root mean square (RMS) of the amplitudes, the median frequency (MF), and the coherence. Based on the spectrograms of both epileptic and simulated seizures, we chose to determine the relative spectral power (RP) in the higher (100–500 Hz) frequency domain. Key Findings: During the tonic seizures there was a significant shift toward higher frequencies, expressed by an increase in the MF and the RP (100–500 Hz). The amplitude characteristic of the signal (RMS) was significantly higher during the tonic phase of the tonic–clonic seizures as compared to the simulated ones, whereas the RMS of the tonic seizures was significantly lower than the simulated ones. The EMG–EMG coherence was significantly higher during the epileptic seizures (both types) as compared to the simulated ones. Significance: Our results indicate that the mechanism of muscle activation during epileptic seizures is different from the physiologic one. Furthermore the sustained muscle activation during the tonic phase of tonic–clonic seizures is different from that during tonic seizures: The tonic phase of tonic–clonic seizures is characterized by increased amplitude of the signal, whereas tonic seizures are produced by a significant increase in the frequency of the signal.

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confidence: 99%

Patterns of muscle activation during generalized tonic and tonic-clonic epileptic seizures

et al. 2011

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“…Electromyography is useful for distinguishing epilepsy from hyperekplexia. 10 In our retrospective study, however, electromyography data were very limited and were not sufficient for an adequate evaluation.…”

Section: Discussionmentioning

confidence: 77%

Clinical and genetic investigation of 17 Japanese patients with hyperekplexia

Mine

Taketani

Yoshida

et al. 2014

Develop Med Child Neuro

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“…Some authors have reported EEGs showing an initial spike in the centro‐parieto‐occipital regions, followed by a short‐lasting train of slow waves and then a dyschronisation lasting for 2–3 s. Concurrent surface Electromyography recording can also be useful to characterise the motor response. However, a clear differentiation from artefact is not always possible …”

Section: Discussionmentioning

confidence: 99%