Avaliação da evolução da atividade eletrica cerebral em recem-nascidos atraves da polissonografia

AUTOR(ES)
DATA DE PUBLICAÇÃO

1994

RESUMO

The maturational changes in EEG patterns during sleep in premature and full-term infants has been described by many authors (DREYFUSBRISAC, 1962; PARMELEE et aI., 1968; LOMBROSO, 1979; SCHER &BARMADA, 1987; FERRARI et aI., 1992). The purpose of this study is to contribute to the process of normatization of neonatal EEG. We have observed the relation between normal graphoelements detected in the neonatal EEG and gestational age (GA) and conceptional age (CA) , and we have also evaluated the normal aspects of EEG bioelectrical maturation in preterm babies as compared to term babies. We reported 46 neonates, selected from a group of 50 neonates from the Neonatallntensive Care Unit and Nursery of the São Lucas Hospital- PUCRS, School of Medicine. They were divided in two groups. Group I consisted of 11 newborns (NB) with GA between 301 32 weeks, followed up with a weekly polysomnography (PS), until they reach 42 weeks of CA. During the research 4 NB were excluded due to the development of neurological pathologies. Group 11 (control) consisted of 35 NB with GA of 34 weeks (5), 36 weeks (10),38 weeks (10) and 40 weeks (10), submitted to one PS iri their first 24-48 hours of life. The PS, performed on a 16- channel Berger EEG, consisted of eleven channels of EEG, electro-oculogram, submental EMG, nasal and abdominal respiratory monitoring and EKG. In each exam during five consecutive epochs of REM and NREM sleep the number of delta brushes, frontal sharp waves, temporal sharp waves, the presence of delta frontal rhytmic activity, grade of concordance, percentual of interhemispheric synchrony, measurement of interburst interval, were verified. Concordance between EEG and comportamental aspects was evaluated by a scale from O to 5 points. The variability ofthis parameters was evaluated during the subsequent weeks, and both groups were compared in weeks 34, 36, 38 and 40. In conclusion, there are normal elements in the neonatal EEG that can be used in the estimation of GA and CA, like delta brushes, percentual of interhemisferic synchrony and interburst i nte rva I. Other elements like frontal and temporal sharp waves and delta frontal rhytmic activity, that correlates with a GA/CA can differentiate a preterm from a term NB. Quantifying concordance showed to be more significant for the recognition of sleep stages than estimating GA/CA. We could not find any statistical difference between both groups considering EEG pattern. If we consider just comportamental aspects, GI showed to be more imature than GII.

ASSUNTO(S)

eletroencefalografia neurologia - recem-nascido

ACESSO AO ARTIGO

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