Pacifier use modifies infant's cardiac autonomic controls during sleep

Area of Science:

• Pediatrics
• Cardiology
• Sleep Medicine

Background:

• Sudden infant death syndrome (SIDS) risk may be reduced by pacifier use and increased parasympathetic activity during sleep.
• Pacifier use is a potential factor influencing infant autonomic nervous system (ANS) regulation during sleep.

Purpose of the Study:

• To investigate the impact of pacifier use on cardiac autonomic control in healthy infants during sleep.
• To evaluate how pacifier usage affects parasympathetic and sympathetic tonus in infants.

Main Methods:

• Polygraphic recordings were conducted on 34 healthy infants (17 pacifier users, 17 non-users) at a median age of 10 weeks.
• Heart rate (HR) spectral analysis was used to assess autonomic nervous system (ANS) activity, specifically parasympathetic tonus and sympathovagal balance.
• Infants were categorized based on regular pacifier use during sleep; thumb-suckers and occasional users were excluded.

Main Results:

• Pacifier use was associated with increased cardiac sympathovagal balance during sucking periods.
• During non-sucking periods in both REM and NREM sleep, pacifier users exhibited lower sympathetic activity and higher parasympathetic tonus compared to non-users.
• A significant portion of infants (63.6%) lost their pacifiers within 30 minutes of falling asleep.

Conclusions:

• Pacifier use significantly alters cardiac autonomic control during both sucking and non-sucking sleep phases in infants.
• Non-nutritive sucking via pacifiers may play a role in regulating infant autonomic control.
• These findings offer insights into potential mechanisms underlying SIDS and the protective effects of pacifier use.