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a Department of
Pediatric Cardiology and Neonatology, Ogaki Municipal Hospital, Ogaki,
Japan, b Department of Pediatrics, Nagoya
University School of Medicine, Japan, c Department of Pediatrics, Okazaki City
Hospital, Japan, d Maternal
and Perinatal Care Center, Nagoya University Hospital, Japan
Correspondence to: Dr Hayakawa, Department of Pediatric Cardiology and Neonatology, Ogaki Municipal Hospital 4-86, Minaminokawamachi, Ogaki, Gifu-Pref, 503-8502, Japan masahaya{at}med.nagoya-u.ac.jp
Accepted 12 November 2000
AIMS
To clarify the
features of the background electroencephalographic (EEG) activities in
clinically well preterm infants born at less than 27 weeks gestation
and to outline their chronological changes with increasing
postconceptional age (PCA).
METHODSEEGs of
clinically well premature infants born at less than 27 weeks gestation
were recorded during the early postnatal period. The infants were
separated into three groups according to their PCA at the time of EEG
recording (21-22 weeks PCA, 23-24 weeks PCA, and 25-26 weeks PCA).
The mean and maximum duration of interburst intervals (IBIs), the mean
duration of bursts, and the percentage of continuous and discontinuous
patterns in each PCA group were evaluated.
RESULTSThere were
three infants at 21-22 weeks PCA, seven at 23-24 weeks PCA, and five
at 25-26 weeks PCA. Eighteen EEG recordings were obtained. The mean
and maximum IBI duration decreased with increasing PCA. The percentage
of continuous patterns increased with increasing PCA. Conversely, the
percentage of discontinuous patterns decreased with increasing PCA.
CONCLUSIONSIn
premature infants born at less than 27 weeks gestation, the
characteristics of the background EEG activities were similar to those
of older premature infants. These changes reflect the development of
the central nervous system in this period.
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Key messages
At less than 27 weeks gestational age, the characteristics of background EEG activities were found to be as follows:
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