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Research

Incidence and causes of severe neonatal hyperbilirubinemia in Canada

Michael Sgro, Douglas Campbell and Vibhuti Shah
CMAJ September 12, 2006 175 (6) 587-590; DOI: https://doi.org/10.1503/cmaj.060328
Michael Sgro
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Douglas Campbell
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Vibhuti Shah
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Abstract

Background: Severe hyperbilirubinemia is the most common cause of neonatal readmission to hospital in Canada even though, in the majority of cases, risk factors can be identified before discharge. Severe neonatal hyperbilirubinemia and kernicterus continue to be reported worldwide in otherwise healthy term infants. We conducted this study to estimate the incidence of severe neonatal hyperbilirubinemia in Canada and to determine underlying causes, improved knowledge of which would be valuable to help identify strategies for risk reduction.

Methods: Data on term infants 60 days of age and younger with unconjugated hyperbilirubinemia were collected prospectively through the Canadian Paediatric Surveillance Program from 2002 to 2004. Infants were included if they had a peak serum total bilirubin level of more than 425 μmol/L or underwent an exchange transfusion. Infants with rhesus iso-immunization or who were born at less than 36 weeks' gestation were excluded.

Results: Of 367 cases reported, 258 were confirmed to be severe neonatal hyperbilirubinemia, for an estimated incidence of 1 in 2480 live births. Causes were identified in 93 cases and included ABO incompatibility (n = 48), glucose-6-phosphate dehydrogenase deficiency (n = 20), other antibody incompatibility (n = 12) and hereditary spherocytosis (n = 7). The mean peak bilirubin level reported was 471 μmol/L (standard deviation [SD] 76 μmol/L, range 156–841 μmol/L). Fifty-seven infants (22.1%) underwent an exchange transfusion. A total of 185 infants (71.7%) were readmitted to hospital, 121 (65.4%) of them within 5 days of age.

Interpretation: Severe neonatal hyperbilirubinemia continues to occur frequently in Canada. In the majority of cases, the underlying cause was not identified. The high readmission rate within days after initial discharge indicates a need for a more thorough assessment of newborn infants and consideration of strategies to identify at-risk newborns, such as predischarge measurement of serum bilirubin levels.

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Canadian Medical Association Journal: 175 (6)
CMAJ
Vol. 175, Issue 6
12 Sep 2006
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Incidence and causes of severe neonatal hyperbilirubinemia in Canada
Michael Sgro, Douglas Campbell, Vibhuti Shah
CMAJ Sep 2006, 175 (6) 587-590; DOI: 10.1503/cmaj.060328

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Incidence and causes of severe neonatal hyperbilirubinemia in Canada
Michael Sgro, Douglas Campbell, Vibhuti Shah
CMAJ Sep 2006, 175 (6) 587-590; DOI: 10.1503/cmaj.060328
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