Document Detail

Amplitude spectral analysis of maturational changes of delta waves in preterm infants.
MedLine Citation:
PMID:  12907274     Owner:  NLM     Status:  MEDLINE    
The aim of this study is to clarify the usefulness of amplitude spectral analysis for an evaluation of maturational changes of delta activities in preterm infants. We chose each ten healthy infants without complications who were 29-30, 31-32, and 33-34 weeks of post-conceptional age (PCA) at electroencephalogram (EEG) recordings. Fast Fourier transform algorithm was applied for amplitude spectral analysis. The analyzed data were divided into four frequency bands; D1 0.53-1, D2 1-2, D3 2-3, and D4 3-4Hz. The average amplitude of six segments with high voltage slow waves was calculated in each frequency band. A significant reduction of the amplitude along with PCA was present in all leads in D1 band. On the other hand, a significant negative correlation with PCA was observed only in the occipital leads in D2, D3 or D4 bands. In conclusion, maturational EEG changes assessed by amplitude spectral analysis were prominent in the occipital areas, and in the frequency less than 1Hz.
Akihisa Okumura; Tetsuo Kubota; Naoko Toyota; Hiroyuki Kidokoro; Koichi Maruyama; Toru Kato; Fumio Hayakawa; Kazuyoshi Watanabe
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Brain & development     Volume:  25     ISSN:  0387-7604     ISO Abbreviation:  Brain Dev.     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-08-08     Completed Date:  2003-10-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7909235     Medline TA:  Brain Dev     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  406-10     Citation Subset:  IM    
Department of Pediatrics, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-Ku, Nagoya, Aichi 466-8550, Japan.
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MeSH Terms
Brain / physiology*
Delta Rhythm*
Fourier Analysis
Infant, Newborn
Infant, Premature / physiology*
Signal Processing, Computer-Assisted*
Sleep Stages / physiology
Spectrum Analysis / methods

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