title: Rett syndrome and the electroencephalogram.
abstract: The EEG is almost always abnormal in patients with Rett syndrome. This is demonstrated in a study based upon 230 EEG records obtained from 44 patients. Rhythmical slowing (mostly 3-5/sec) represents the most common EEG abnormality (30 patients). Diffuse, scattered or bilateral-synchronous spikes or sharp waves were found in 22 patients. Slow spike-wave complexes were present in 9 patients. With advancing age, the EEG abnormalities tend to decline and ill-defined low voltage records may develop. These changes may parallel an intrinsic disease course with an early active phase followed by a phase of residual impairment.
mesh_terms: D001921:Brain / Q000503:physiopathology*; D002648:Child; D002675:Child, Preschool; D004569:Electroencephalography; D004827:Epilepsy / Q000150:complications / Q000175:diagnosis; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology*; D009069:Movement Disorders / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology*; D012890:Sleep / Q000502:physiology; D013577:Syndrome