![]() (See active sleep).Īfter-discharge: (1) EEG seizure pattern following single or repetitive electrical stimulation of a discrete area of the brain via cortical or intracerebral electrodes. (See quiet sleep, activité moyenne, tracé discontinue, REM sleep).Īctivity, EEG: An EEG wave or sequence of waves of cerebral origin.Īctivité moyenne: Neonatal EEG pattern of wakefulness and active sleep in term and near term infants characterized by continuous, low to medium amplitude mixed frequency activity (25–50 µV) with a predominance of theta and delta and overriding beta activity. ![]() The EEG shows activité moyenne in term and near term infants, and tracé discontinue (discontinuous pattern) in preterm infants <34 weeks of post menstrual age (PMA) the inter-burst interval depends on the PMA. Examples include: eye closing, hyperventilation, photic stimulation, natural or drug-induced sleep, sensory stimulation (acoustic, somatosensory or pain).Īctive sleep: Normal sleep stage in neonates characterized by eye closure, intermittent periods of rapid eye movements, irregular respirations and scant body movements. Terms suggested, whenever appropriate: spike-and-slow-wave complex, 3 c/s spike-and-slow-wave complex, sharp-and-slow wave complex.Īctivation procedure: Any procedure designed to modulate EEG activity, for instance to enhance physiological waveforms or elicit abnormal paroxysmal activity. Use of term discouraged when describing EEG patterns. A proposal for the EEG report form is given in Appendix A.Ībsence: A generalized seizure type. The terminology of the EEG interpretation should follow common neurological and clinical practice and use terms understandable to other physicians not specialized in EEG. The EEG interpretation summarizes the results of the EEG and gives a clinical interpretation in light of the diagnosis and the questions posed by the referring physician. The interpretation of the EEG requires knowledge of the patient’s age, past medical and medication history, their clinical condition during the EEG, particularly level of consciousness/vigilance and ability to co-operate. The EEG report should follow a standard format that includes a factual description and a clinical interpretation of the EEG record. Biological and technical artifacts that interfere with an adequate EEG interpretation should either be eliminated or, if this is not possible, be noted in the description. The description should be independent of the recording parameters such as amplification, montages, and computer program/display. All EEG phenomena should be described as precisely as possible in terms of frequency, amplitude, phase relation, waveform, localization, quantity, and variability of these parameters ( Brazier et al., 1961). It is based on the previous proposals ( Chatrian et al., 1974, Noachtar et al., 1999, Noachtar et al., 1999) and includes terms necessary to describe the EEG and to generate the EEG report. This glossary includes the terms most commonly used in clinical EEG.
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