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Serial adrenal ultrasonography in normal neonates
E M Scott1, A Thomas, H H McGarrigle
1Department of Obstetrics and Gynaecology, University College and Middlesex School of Medicine, London, England.
Summary
Neonatal adrenal gland size significantly decreases in the first 42 days of extrauterine life, while kidneys grow. This study establishes normal neonatal adrenal parameter values using serial ultrasounds.
Area of Science:
- Neonatal imaging
- Pediatric endocrinology
- Ultrasound diagnostics
Background:
- Establishing normative data for neonatal organ development is crucial for clinical assessment.
- The adrenal glands undergo significant changes in early postnatal life.
- Kidney growth is a standard developmental marker in neonates.
Purpose of the Study:
- To determine normal neonatal values for adrenal gland parameters.
- To document the changes in adrenal gland size during the early neonatal period.
- To compare adrenal gland development with concurrent kidney growth.
Main Methods:
- Serial ultrasound examinations were performed on 12 healthy term neonates.
- Scans were conducted on days 1, 3, 5, 11, 21, and 42 post-birth.
- Measurements included adrenal and kidney dimensions (diameters, circumference, area, length).
Main Results:
- A significant decrease was observed in all measured adrenal parameters between day 1 and day 5 (p < .002).
- Further significant reductions in adrenal parameters were noted between day 1 and day 42 (p < .00005).
- In contrast, neonatal kidneys showed a consistent increase in size over the same 42-day period.
Conclusions:
- Neonatal adrenal glands exhibit rapid involution in the first week of life, continuing over 42 days.
- These findings provide essential reference ranges for neonatal adrenal gland dimensions.
- The contrasting growth patterns highlight distinct developmental trajectories of adrenal glands and kidneys in early neonatal life.