[Electrophysiological studies on the adaptation of eutrophic mature newborn infants during sleep in the first week of life].

The aim of the study was: elaboration of behaviour characteristics of eutrophic healthy newborns during adaptation (first 5 days) by determination of sleep states and interrelation of particular sleep states as well as characteristics of respiratory function in active and quiet sleep. Material comprised 50 eutrophic healthy newborns born at term between 38-41 weeks of conceptional age with body weight 2800-4300 g. 33 newborns were born by spontaneous delivery (SpD) and 17 by primary cesarean section (CS). Normal state of all clinically investigated newborns immediately after delivery and in the newborns period was noted. According to the aim of study polygraphic sleep records were performed in all newborns and they included EEG, chin electromyogram, respiratory and cardiac rates, eye movements and body movements. Recordings time was 2-3 hours. All records were taken during day sleep between 2 feedings (at 9 and 12). From all polygraphic investigations 75 records were selected for detailed analysis. Among them there was 50 records of newborns delivered by SpD and 25 records of newborns delivered by CS. In each consecutive 5 days of life there were analysed 10 records of SpD and 5 of CS. These records were the subject of investigation of behavioural patterns of newborn including sleep and respiratory function in sleep in the first 5 consecutive days of life. Each sleep state (active, quiet and indeterminate) was classified using 4 electropolygraphic parameters (EEG, respiration, eye and body movements). Characteristics of behavioural newborn pattern were determined in consecutive 5 days of life considering the kind of delivery and using quantitative and qualitative analysis of obtained data. Qualitative analysis concerned the occurrence of particular sleep states and the type of the first sleep state beginning the sleep. Quantitative analysis comprised: time duration of wakefulness, time duration of each sleep state--expressed by total time duration of each sleep state and by longest time duration of each sleep state, calculated during 100 minutes of sleep. These values were determined by quantitative analysis of individual records as well as by medium values received from all records in every day of life. Characteristics of respiratory function were analysed analogically in the same 5 days of life with regard to the kind of delivery, independently of active and quiet sleep state.(ABSTRACT TRUNCATED AT 400 WORDS)