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Cardiac autonomic characteristics in infants sleeping with their head covered by bedclothes
Patricia Franco1, Willy Lipshut, Filomena Valente
1Pediatric Sleep Unit, Neuropediatrics, Erasmus Hospital, Brussels, Belgium. Patricia.Franco@skynet.be
Insights
Covering an infant's head during sleep disrupts cardiac autonomic control, increasing sympathetic activity and body temperature. This finding is crucial for understanding Sudden Infant Death Syndrome risks associated with bedding.
Area of Science:
- Pediatric Sleep Medicine
- Autonomic Nervous System Physiology
- Infant Health and Safety
Background:
- Sudden Infant Death Syndrome (SIDS) risk is linked to infants sleeping with bedding covering their heads.
- Understanding the physiological impact of head covering on infant autonomic control is essential for SIDS prevention.
Purpose of the Study:
- To investigate the effects of head covering by bedclothes on cardiac autonomic nervous system control in infants.
- To assess changes in heart rate variability, sleep parameters, and temperature during head-covered sleep.
Main Methods:
- Polygraphic recordings of 16 healthy infants (12 weeks median age) over one night.
- Head covering with a bedsheet for ~45 minutes during both REM and NREM sleep stages.
- Simultaneous recording of sleep, breathing, heart rate, and body temperatures (rectal and pericephalic).
Main Results:
- Head covering led to decreased parasympathetic and increased sympathetic activity during both REM and NREM sleep.
- Infants exhibited significantly higher rectal and pericephalic temperatures when their heads were covered.
- Autonomic balance was significantly altered, potentially due to elevated micro-environmental temperatures.
Conclusions:
- Covering an infant's head with bedding alters autonomic nervous system balance, increasing sympathetic drive.
- Elevated temperatures in the infant's microenvironment may be a key factor in these observed physiological changes.
- Findings highlight potential risks associated with bedding use and infant sleep safety, relevant to SIDS research.
Abstract:
The risk of Sudden Infant Death Syndrome is increased in infants sleeping with their head covered by bedding items. This study was designed to evaluate cardiac autonomic nervous controls in infants sleeping with the head covered by bedclothes. Sixteen healthy infants with a median age of 12 weeks (range 9-13 weeks) were recorded polygraphically for one night. While they slept in their usual supine position, a bedsheet was placed over their head for about 45 min. All infants were challenged with the head covered and with the head free during both rapid eye movement (REM) and non-rapid eye movement (NREM) sleep. Sleep, breathing and heart rate (HR) characteristics were recorded simultaneously, together with rectal and pericephalic temperatures. In both head-free and head-covered conditions, autoregressive spectral analysis of HR was evaluated as a function of sleep stages. During the head-covered periods, parasympathetic tonus decreased and sympathetic activity increased in both REM and NREM sleep. Compared with the head-free periods, the head-covered sleep periods were characterized by greater rectal (P = 0.012) and pericephalic temperatures (P = 0.002). Covering the infant's head with a bedsheet was associated with significant changes in autonomic balance. The finding could be related to an elevation in temperatures within the infant's microenvironment.