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Prenatal exposure to cigarette smoking is associated with a decrease in arousal in infants.

P Franco1, J Groswasser, S Hassid

  • 1Pediatric Sleep Unit, Erasmus Hospital, Free University of Brussels, Brussels, Belgium.

The Journal of Pediatrics
|July 7, 1999
PubMed
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Infants exposed to prenatal cigarette smoke had higher auditory arousal thresholds. This indicates that maternal smoking during pregnancy impacts infant sleep arousal, potentially increasing risks for sudden infant death syndrome.

Area of Science:

  • Neonatal research
  • Sleep studies
  • Public health

Background:

  • Sudden infant death syndrome (SIDS) is linked to prenatal smoke exposure and impaired sleep arousal.
  • Maternal smoking during pregnancy is a known risk factor for SIDS.

Purpose of the Study:

  • To investigate if infants born to mothers who smoked during pregnancy exhibit higher auditory arousal thresholds compared to infants of non-smokers.
  • To determine if the effects of maternal smoking on arousal thresholds manifest before birth.

Main Methods:

  • Polygraphic recordings were used to study 26 newborns and 42 infants (median age 12 weeks).
  • Participants were categorized based on maternal smoking status during pregnancy (smokers vs. non-smokers).
  • Auditory arousal and awakening thresholds were assessed using white noise stimuli during REM sleep.

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Main Results:

  • Newborns and infants of mothers who smoked required more intense auditory stimuli to elicit arousal.
  • A statistically significant difference was observed in arousal thresholds for both newborns (P=.002) and infants (P=.044).
  • Behavioral awakening occurred less frequently in newborns exposed to smoke prenatally (P=.002).

Conclusions:

  • Prenatal exposure to maternal cigarette smoke is associated with elevated auditory arousal thresholds in infants.
  • The findings suggest that the impact of smoking on infant arousal mechanisms occurs during fetal development.
  • This highlights a critical window for intervention to mitigate SIDS risk factors.