PURPOSE: This study aimed to evaluate the sensitivity of the EEG in @entity5427 ( @entity5427 ), to verify the age at onset of suggestive EEGs and to study EEG patterns, analyzing variations and comparing our findings with nomenclature previously used. METHODS: Seventy EEG and 15 V-EEGs of 26 @entity1 were analyzed. Suggestive EEG patterns of @entity5427 were classified in delta pattern (DP), theta pattern (TP), and @entity3389 ( @entity3389 ). Generic terms were used to simplify the analysis. RESULTS: Suggestive EEGs were observed in 25 (96.2%) @entity1 . DP occurred in 22 @entity1 with four variants-hypsarrhythmic-like: irregular, high-amplitude, generalized delta activity (DA) with multifocal @entity302 ( @entity302 ); slow variant: regular, high-amplitude, generalized DA with rare @entity302 ; ill-defined slow spike-and-wave: regular, high-amplitude, generalized DA with superimposed @entity302 characterizing a slow wave, with notched appearance; triphasic-like: rhythmic, moderate-amplitude DA over anterior regions with superimposed @entity302 . TP was observed in eight @entity1 , as generalized or over the posterior regions. @entity3389 were seen in 19 @entity1 as runs of sharp waves or runs of high-amplitude slow waves with superimposed @entity302 . TP was the only age-related pattern (younger than 8 years) and observed only in @entity1 with deletion. In 15 @entity1 who had an EEG before the clinical diagnosis, 60% had a suggestive tracing. CONCLUSIONS: Although some EEG descriptions are not very detailed, and every author describes findings in a slightly different manner, obviously a common denominator must exist. In this context, EEG seems to be a very sensitive method for the diagnosis of @entity5427 , offering an opportunity to corroborate this etiologic diagnosis. Conversely, we do not believe that these patterns may be accounted as specific, except for the delta pattern, which seems to be extremely unusual in other syndromes. Other EEG patterns observed in @entity5427 , such as theta activity and @entity3389 , occur in a wide variety of disorders. Nonetheless, their importance for the EEG diagnosis of @entity5427 is supported by the fact that they are associated with other features and may be helpful in a proper clinical setting.

XXXX : difficulties in EEG pattern recognition and possible misinterpretations.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity3389 :: ('MESH:D019522', 'Disease') :: ['PDs', 'posterior discharges'] @entity5427 :: ('MESH:D017204', 'Disease') :: ['AS', 'Angelman syndrome'] @entity302 :: ('MESH:D004827', 'Disease') :: ['EDs', 'epileptiform discharges']
@entity5427 :: (MESH:D017204,Disease) :: ['Angelman syndrome']
