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Neonatal polycythemia: frequency of clinical manifestations and other associated findings
Insights
Neonatal polycythemia, a condition of high red blood cell count in newborns, presents with varied symptoms like feeding problems and lethargy. This study found its frequency lower than previously reported.
Area of Science:
- Neonatology
- Pediatric Hematology
Background:
- Neonatal polycythemia is characterized by an elevated red blood cell count in newborns.
- Understanding the frequency and clinical manifestations of neonatal polycythemia is crucial for timely diagnosis and management.
Purpose of the Study:
- To determine the frequency of neonatal polycythemia and associated clinical and laboratory findings.
- To investigate the spectrum of symptoms and complications in a large cohort of affected infants.
Main Methods:
- A two-part study was conducted, analyzing data from a single institution and a large multicenter cohort (US Army hospitals).
- Infants screened for neonatal polycythemia were evaluated for clinical signs, symptoms, and laboratory abnormalities.
- Data from 3,768 infants (part 1) and 220,050 infants (part 2) were analyzed over 4- and 5-year periods, respectively.
Main Results:
- Neonatal polycythemia occurred in 1.46% of infants at the institutional cohort and 0.42% in the multicenter cohort.
- Common symptoms included feeding problems, plethora, lethargy, and respiratory distress; hypoglycemia and hyperbilirubinemia were frequent laboratory findings.
- Unexpected findings included intracranial hemorrhages, gonadal dysgenesis, and cystic fibrosis in a small percentage of affected infants.
Conclusions:
- The overall frequency of neonatal polycythemia may be lower than previously estimated.
- Clinical presentation is variable, with some infants asymptomatic despite polycythemia.
- The study highlights the importance of recognizing diverse clinical features and rare associated conditions in neonatal polycythemia.
Abstract:
We report the results of a two-part study examining the frequency of symptoms and other findings associated with neonatal polycythemia. In the first part of the investigation, we evaluated the occurrence and features of the disorder in a cohort of 3,768 infants born at our institution that had been screened for the disorder during a 4-year period. Fifty-five infants (1.46%) had neonatal polycythemia. Of these infants, 85% had features associated with the disorder. Frequent signs and symptoms included "feeding problems" (21.8%), plethora (20.0%), lethargy (14.5%), cyanosis (14.5%), respiratory distress (9.1%), jitteriness (7.3%), and hypotonia (7.3%). Other findings included hypoglycemia (40.0%) and hyperbilirubinemia (21.8%). Of the polycythemic infants, 14.5% had no clinical symptoms or associated laboratory abnormalities. In the second portion of the study, we reviewed the features of polycythemia in all infants so diagnosed who were born in United States Army hospitals, worldwide, during a 5-year period. There were 220,050 infants born during this period; 932 (0.42%) were diagnosed as having neonatal polycythemia. Frequent findings were hyperbilirubinemia (33.5%), hypoglycemia (13.0%), and respiratory distress (6.6%). In this large group, only 13 (1.4%) had necrotizing enterocolitis, and nine (1.0%) were thrombocytopenic. Several findings among the 932 infants were unexpected. Six of the infants (only one premature) had intracranial hemorrhages. Additionally, three of the 932 had gonadal dysgenesis and three had cystic fibrosis. We found that premature infants were not less prone to having polycythemia and that the overall frequency of the disorder was less than that which has been previously reported.