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Neonatal polycythemia and chest roentgenograms
Insights
High hematocrit in newborns (polycythemia) is linked to larger heart size and lung changes on chest X-rays. These findings were more pronounced in infants experiencing symptoms.
Area of Science:
- Neonatal Medicine
- Pediatric Radiology
- Hematology
Background:
- Neonatal polycythemia, defined by elevated hematocrit, can impact infant health.
- Radiographic findings in polycythemic newborns require further characterization.
Purpose of the Study:
- To investigate chest roentgenogram findings in newborns with high hematocrit (polycythemia).
- To compare radiographic features between polycythemic and non-polycythemic newborns.
Main Methods:
- Retrospective analysis of chest roentgenograms from 34 polycythemic newborns (hematocrit ≥75 at 12 hours).
- Comparison with 18 non-polycythemic newborns (hematocrit ≤65).
- Assessment of cardiothoracic ratio (CTR), pulmonary vascularity, and lung aeration.
Main Results:
- Polycythemic infants exhibited a greater cardiothoracic ratio (CTR) compared to non-polycythemic infants.
- Symptomatic polycythemic infants showed the largest CTR.
- Increased pulmonary vascularity and pulmonary hyperaeration were more frequent in polycythemic newborns.
- Symptomatic or clinical signs were observed in 11 polycythemic infants versus 3 non-polycythemic infants.
Conclusions:
- Neonatal polycythemia is associated with significant radiographic changes, including cardiomegaly and altered pulmonary vasculature.
- These findings suggest potential cardiopulmonary effects of high hematocrit in newborns.
- Radiographic assessment may aid in identifying symptomatic polycythemic infants.
Abstract:
Chest roentgenograms of 34 newborns with a hematocrit of 75 or more at the age of 12 hours were studied. An analysis was made of the findings during the first four days of life and the results were compared with those of 18 newborns with a hematocrit of 65 or less. The cardiothoracic ratio (CTR) was found to be greater in the polycythemic infants than in the non-polycythemic infants, and greatest of all in infants with symptomatic polycythemia. Prominent pulmonary vascularity and pulmonary hyperaeration were seen more often in polycythemic newborns than in non-polycythemic infants. Eleven infants in the polycythemic group and three in the non-polycythemic group had some symptoms or signs.