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Recurrence risk of neonatal hyperbilirubinemia in siblings
M J Khoury1, E E Calle, R M Joesoef
1Division of Birth Defects and Developmental Disabilities, Centers for Disease Control, Atlanta, GA 30333.
Insights
Neonatal hyperbilirubinemia (NHB) recurrence is significantly higher in siblings. This familial risk persists regardless of known environmental factors, suggesting a genetic component to NHB.
Area of Science:
- Pediatrics
- Genetics
- Neonatal Health
Background:
- Neonatal hyperbilirubinemia (NHB) is a common condition in newborns.
- Understanding the recurrence risk and potential causes of NHB is crucial for infant health.
- Previous studies have explored various risk factors, but familial aggregation requires further investigation.
Purpose of the Study:
- To investigate the recurrence risk of neonatal hyperbilirubinemia (NHB) in full siblings.
- To determine if known environmental risk factors explain the observed familial aggregation of NHB.
- To explore the familial nature of NHB in a large cohort.
Main Methods:
- Retrospective cohort study of 3301 infants from 1669 sibships.
- Medical records were abstracted to identify cases of NHB (peak bilirubin > 205 mumol/L, excluding hemolytic disease).
- Statistical analysis compared NHB risk in newborns with and without affected siblings, adjusting for potential confounders.
Main Results:
- Newborns with one or more prior siblings with NHB had a 3.1 times higher risk (10.3% vs 3.6%).
- The risk of severe NHB (peak bilirubin > 257 mumol/L) was 12.5 times higher in newborns with affected siblings (10.5% vs 0.9%).
- Adjusting for feeding patterns, birth year, maternal, and infant factors did not explain the increased sibling risk.
Conclusions:
- The study provides strong evidence for the familial nature of neonatal hyperbilirubinemia.
- The increased recurrence risk in siblings is not explained by known environmental factors.
- These findings suggest a potential genetic predisposition to NHB.
Abstract:
The recurrence of neonatal hyperbilirubinemia (NHB) in full siblings was studied in 3301 live infants born between 1966 and 1986 to 1669 male US Army veterans who were part of a nationwide health study. The study population included 580 sibships with one infant, 679 with two, and 410 with three or more. Hospital of birth medical records were abstracted on these children. Neonatal hyperbilirubinemia was defined as present if the recorded peak bilirubin level was greater than 205 mumol/L in the absence of hemolytic disease of the newborn. The risk of NHB in newborns who have one or more prior sibs with NHB was 3.1 times higher than that of newborns who have prior sibs without NHB (10.3% vs 3.6%). Simultaneous adjustment for risk factors for NHB, such as feeding patterns, year of birth, maternal obstetric events, and infant health variables, did not explain the excess risk of NHB in sibs. Moreover, the risk of severe NHB (peak bilirubin level, greater than 257 mumol/L) in newborns who have one or more prior sibs with severe NHB was 12.5 times higher than that of newborns who have prior sibs without severe NHB (10.5% vs 0.9%). Separate analyses in sibships where all sibs were breast-fed and in sibships where all sibs were bottle-fed gave similar results. These data clearly suggest the familial nature of NHB. The higher risk of recurrence of NHB in sibs does not seem to be due to known environmental risk factors for NHB.