Sleep EEG patterns in infants with congenital Zika virus syndrome.
Clin Neurophysiol 2016;
128:204-214. [PMID:
27923187 DOI:
10.1016/j.clinph.2016.11.004]
[Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Revised: 11/01/2016] [Accepted: 11/04/2016] [Indexed: 11/29/2022]
Abstract
OBJECTIVES
To describe sleep EEG patterns of neonates, and infants with microcephaly due to congenital Zika virus (ZikV) syndrome.
METHODS
A descriptive case series of EEGs performed in a cohort of neonates with microcephaly monitored from October 2015 to February 2016 at a University Hospital in Northeast Brazil. Infants were investigated following an established protocol that includes EEG, neuroimaging studies, PCR and specific antibodies for ZikV detection.
RESULTS
EEGs (n=37) from 37 infants were reviewed. Age at investigation varied from 1 to 5months (mean=2.6). Diffuse low voltage (n=7), background asymmetry (n=6) and modified hypsarrhythmia with or without burst-suppression (n=11), were the main background abnormalities identified. Interictal EEG abnormalities were identified in 23 recordings (62%) and localized as focal frontal (n=8) or occipital (n=2) spikes/sharp, multifocal spikes/sharp waves (n=13). Electrographic seizures without clinical manifestation were identified in 4 recordings and characterized as focal pseudo rhythmic pattern. Further findings were focal high amplitude slow waves that were registered in the frontal (n=3) or occipital (n=1) regions.
CONCLUSIONS
Different types of EEG abnormalities were encountered with a predominance of interictal epileptogenic activity and hypsarrhythmia.
SIGNIFICANCE
Sleep EEGs in congenital Zika virus syndrome are consistently abnormal even in infants who have not yet developed epilepsy.
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