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Free Content Bladder voiding in sleeping infants is consistently accompanied by a cortical arousal

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Summary

The aim of the study was to find out whether bladder voiding in healthy sleeping infants was accompanied by any arousal reaction. Polygraphic recordings were performed in 21 healthy infants (11 female) born at term. The infants’ age at study entry was 42 ± 4 days and actual body weight was 4852 ± 689 g (mean ± SD). Bladder voiding was recorded by an adapted enuresis detector which was connected to the polygraphic computer unit. Arousals were defined as suggested by the ‘International Paediatric Work Group on Arousals’. Awakenings were excluded from the study. Bladder voiding was recorded at a mean time of 68 ± 7 min after the infant had fallen asleep and occurred during quiet sleep (QS). Electroencephalogram frequency (P < 0.01) and heart rate (P < 0.05) were higher during the 5-s period before and after bladder voiding when compared with a 30-s interval before voiding. Furthermore, bladder voiding was accompanied by body movements in all infants. Respiratory frequency did not change significantly. We could demonstrate for the first time in sleeping infants, that bladder voiding during QS was accompanied by a cortical arousal.
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Keywords: arousal; infant; polysomnography; sleep; voiding

Document Type: Research Article

Affiliations: 1: Division of Neonatology, Department of Pediatrics, Medical University of Graz, Graz, Austria 2: Division of General Pediatrics, Department of Pediatrics, Medical University of Graz, Graz, Austria

Publication date: 2006-03-01

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