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[Physiologic jaundice in preterm newborns (author's transl)]
Insights
Early jaundice in newborns, appearing within 24 hours, is often pathological. This study suggests current definitions for physiologic jaundice may not apply to preterm infants, highlighting a need for revised criteria in neonatal care.
Area of Science:
- Neonatology
- Pediatric Gastroenterology
- Clinical Pediatrics
Context:
- Jaundice is common in newborns, with early onset (within 24 hours) typically considered pathological.
- Physiologic jaundice is defined by its later onset, after the first postnatal day.
- Clinical observations noted early jaundice of unknown etiology in preterm infants, prompting further investigation.
Purpose:
- To retrospectively identify cases of early-onset jaundice of unknown origin in preterm newborns.
- To compare the clinical course of early-onset jaundice of unknown origin with physiologic jaundice in similar preterm infants.
- To evaluate maternal drug administration prior to birth as a potential cause for early jaundice.
Summary:
- A retrospective study of 1,527 records identified 11 cases of early jaundice of unknown origin in preterm infants.
- These cases were compared to 11 preterm infants with physiologic jaundice; jaundice evolution was similar, differing mainly in age of onset.
- Bilirubin levels and age at peak bilirubin differed between the early jaundice group (7.4 mg/dL at 14 hours) and the physiologic jaundice group (9.8 mg/dL at 53 hours).
Impact:
- The study questions the applicability of chronological criteria for defining physiologic jaundice in preterm infants.
- Findings suggest that current definitions, established for full-term infants, may require adjustment for preterm neonates.
- This research could lead to revised diagnostic criteria for neonatal jaundice, improving care for preterm infants.
Abstract:
Jaundice appearing in the first 24 hours of life, usually called early jaundice, is regarded as pathologic. On the opposite, one of the defining criteria of physiologic jaundice is its' occurrence after the first day of postnatal life. Authors, starting from repeated clinical observations of early jaundice of unknown etiology in preterm newborns, bring about a retrospective study of 1,527 clinical records in order to identify the cases of early jaundice of unknown origin. After known early jaundice-producing causes were excluded, 11 "unknown origin" cases were left. On comparing them with 11 other cases of similar characteristics (gestational age, weight at birth, year and season) who had presented physiologic jaundice, it turned out that the evolution of jaundice was comparable in both groups, except for age of appearance. Early jaundice group bilirubinemia was X = 7.4 (SD +/- 1.59 mg./dl. at 14 (+/- 6.6) hours of age, and physiologic jaundice group bilirubinemia was X = 9.8 (SD +/- 2.25) mg./dl. at 53 (+/- 21.3) hours at age. Since according to selection criteria both groups were made up by healthy preterm newborns, without any perinatal pathology, a study of the drugs administered to the mothers within 24 hours prior to birth was performed: not any reason for early appearance of jaundice was found. Authors' hypothesis support that the chronological criteria used to define physiologic jaundice in full-term newborns cannot always be applied to preterm newborns.