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[Plasma aldosterone in childhood]
Insights
Plasma aldosterone levels decrease significantly in the first two years of life, stabilizing by age two. This study measured aldosterone in children and newborns, noting age-related changes and responses to stimuli.
Area of Science:
- Endocrinology
- Pediatric Physiology
Context:
- Aldosterone plays a crucial role in electrolyte balance and blood pressure regulation.
- Understanding aldosterone levels in pediatric populations is essential for diagnosing endocrine disorders.
- Limited data exists on aldosterone dynamics during early childhood development.
Purpose:
- To determine plasma aldosterone levels in children across a wide age range (2 weeks to 14 years).
- To investigate aldosterone concentrations in maternal and cord blood during uncomplicated vaginal delivery.
- To examine the effects of various stimuli (ACTH, salt restriction, vomiting, fever) on pediatric aldosterone levels.
Summary:
- Plasma aldosterone levels were measured using a modified radioimmunological method.
- Significantly lower aldosterone levels were observed in children aged 2-14 years compared to newborns and infants.
- A negative correlation between age and plasma aldosterone was found in the first two years of life.
- Stimulation tests in children yielded results comparable to adult literature, with discussion on vomiting and fever mechanisms.
Impact:
- Provides normative data for plasma aldosterone in children, aiding clinical diagnosis.
- Highlights the dynamic changes in aldosterone during early development.
- Offers insights into the physiological regulation of aldosterone in response to stress and hormonal factors in pediatric patients.
Abstract:
According to a radioimmunological method modified in our laboratory we determined plasma aldosterone levels under standardized conditions in children of different age from 2 weeks to 14 years, in women undergoing uncomplicated vaginal delivery, and in the cord blood of the corresponding newborn babies. Furthermore, the effect of different stimulating factors (ACTH, salt restriction, severe vomiting, fever) in children was studied. In mothers and cord blood we found 68.6 +/- 39.3 ng/100 ml and 75.5 +/- 37.4 ng/100 ml, respectively. In the first two years of life there is a decrease in plasma aldosterone levels to the relatively constant concentration at the age of 2 to 14 years (7.3 +/- 4.7 ng/100 ml). The age groups 2 weeks to 1 year, 1 to 2 years and 2 to 14 years all show significant differences. A correlation of age (first two years of life) and plasma aldosterone level could be shown (correlation coefficient -0.50 according to Pearson). The stimulation results are comparable with literature data concerning adults. The mechanism of stimulation by vomiting and fever is discussed.