Spectral analysis of electroencephalogram during sleep-related apneas in pre-term and term born infants in the first weeks of life

Objectives: A correlation between sudden infant death syndrome (SIDS) and apnea has been discussed in a variety of studies. We analyzed polysomnographic data in 51 infants and investigated correlations between the manifestation of apneas and changes in EEG pattern. Methods: Measurements were performed by means of the commercial polysomnographic device ‘ALICE III’. Spectral analysis of certain parts of the registered EEG was performed. Results: During apnea a reduction of the EEG amplitude was seen. The extent of the decrease differed slightly between the frequency bands. Conclusions: According to the widespread agreement that a lower voltage of electrical brain activity is a fundamental sign of waking up, we hypothesize that the observed change might be an immature type of arousal reaction.