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Prematurity and Sudden Unexpected Infant Deaths in the United States
Barbara M Ostfeld1, Ofira Schwartz-Soicher2, Nancy E Reichman3,4
1Department of Pediatrics, Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey; ostfelba@rwjms.rutgers.edu.
Insights
Prematurity increases the risk of sudden unexpected infant death (SUID). Despite safe sleep recommendations, SUID rates remain inversely associated with gestational age (GA), indicating multiple causes requiring further research and multifaceted strategies.
Area of Science:
- Neonatal research
- Public health
- Pediatric safety
Background:
- Prematurity is a significant risk factor for sudden unexpected infant death (SUID).
- The American Academy of Pediatrics issued safe sleep education recommendations for Neonatal Intensive Care Units (NICUs) in 2011.
- This study examines the association between gestational age (GA) and SUID following these guidelines.
Purpose of the Study:
- To document the association between gestational age (GA) and sudden unexpected infant death (SUID) after the 2011 AAP safe sleep recommendations.
- To analyze SUID rates across different gestational age groups in the postneonatal period.
Main Methods:
- Utilized US linked infant birth and death certificate data from 2012-2013.
- Calculated SUID rates by gestational age (GA) for postneonatal, out-of-hospital, and autopsied cases.
- Employed logistic regression to model the association between GA and SUID, comparing cases and survivors.
Main Results:
- Infants who died from SUID were more likely to be preterm (<37 weeks GA) compared to survivors (22.61% vs 10.79%).
- SUID rates decreased as gestational age increased, with the highest rates in the earliest GA groups.
- Factors such as prenatal smoking, inadequate prenatal care, and poverty-associated demographics were strongly linked to SUID.
Conclusions:
- Despite 2011 safe sleep guidelines, SUID rates showed an inverse association with gestational age in 2012-2013.
- The risk of SUID in premature infants likely stems from multiple etiologies, including biological vulnerabilities.
- Effective SUID reduction strategies must be multifaceted, addressing both biological factors and the efficacy of NICU education programs.
Background And Objectives:
Prematurity, a strong risk factor for sudden unexpected infant death (SUID), was addressed in recommendations by the American Academy of Pediatrics in 2011 for safe sleep education in NICUs. We documented associations between gestational age (GA) and SUID subsequent to these guidelines.
Methods:
Using the 2012-2013 US linked infant birth and death certificate period files, we documented rates per live births of sudden infant death syndrome, ill-defined and unspecified causes, accidental suffocation and strangulation in bed, and overall SUID by GA in postneonatal, out-of-hospital, and autopsied cases; compared survivors and cases; and estimated logistic regression models of associations between GA and SUID.
Results:
SUID cases were more likely than survivors to be <37 weeks' GA (22.61% vs 10.79%; P < .0001). SUID rates were 2.68, 1.94, 1.46, 1.16, 0.73, and 0.51 per 1000 live births for 24 to 27, 28 to 31, 32 to 33, 34 to 36, 37 to 38, and 39 to 42 weeks' GA, respectively. Logistic regression models additionally indicated declines in the risk for SUID as GA increased. Prenatal smoking, inadequate prenatal care, and demographics associated with poverty were strongly associated with SUID.
Conclusions:
Despite the 2011 American Academy of Pediatrics recommendations for increased safe sleep education in the NICUs, SUID rates were inversely associated with GA in 2012 to 2013, suggesting that risk of SUID associated with prematurity has multiple etiologies requiring continued investigation, including biological vulnerabilities and the efficacy of NICU education programs, and that strategies to reduce SUID should be multifaceted.
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