"Back to sleep" and unexplained death in infants

Area of Science:

• Pediatric Medicine
• Forensic Pathology
• Radiology

Background:

• Sudden and unexplained infant deaths, including Sudden Infant Death Syndrome (SIDS), remain a significant concern.
• The role of infant sleep position in airway patency and potential obstruction requires further investigation.

Purpose of the Study:

• To investigate the relationship between infant body position and upper airway space using computed tomography (CT) scans.
• To compare CT findings with the infant's position at the death scene and autopsy results.

Main Methods:

• A prospective study of infants referred to a specialized unexplained infant death center.
• Computed tomography (CT) scans were used to assess upper airway dimensions in prone (head down, head rotated) and supine positions.
• Autopsy findings, including maxillomandibular complex size and cause of death, were correlated with CT data.

Main Results:

• Airway occlusion behind the tongue base was observed in 89% of infants in the prone head-down position, 48% in the prone head-rotated position, and 18% in the supine position.
• Of 27 infants with unexpected crib deaths, 17 were diagnosed with SIDS.
• Four infants with mild facial dysplasia, found supine, had SIDS diagnosed in three cases, suggesting supine position may not be universally protective.

Conclusions:

• Infant sleep position, particularly prone, is associated with a higher incidence of upper airway obstruction.
• The supine position may not offer complete protection against airway compromise in infants with specific anatomical features, such as a small maxillomandibular complex.
• Sleep position should be considered a potential contributing factor in infant deaths, even when an autopsy identifies a cause.