Related Experiment Videos
Plasma thyrocalcitonin and parathyroid hormone concentrations in early neonatal hypocalcaemia
Insights
Neonatal hypocalcemia in preterm infants is linked to high thyrocalcitonin hormone levels. Full-term infants small for gestational age with hypocalcemia may have different, non-hormonal causes.
Area of Science:
- Neonatalogy
- Endocrinology
- Pediatric Biochemistry
Background:
- Early neonatal hypocalcemia is a common complication in low birthweight infants.
- Understanding the distinct pathophysiological mechanisms is crucial for effective management.
Purpose of the Study:
- To investigate the roles of thyrocalcitonin hormone and parathyroid hormone in early neonatal hypocalcemia.
- To differentiate the pathogenesis of hypocalcemia in preterm versus small for gestational age, full-term infants.
Main Methods:
- Daily measurement of serum calcium, phosphorus, magnesium, immunoreactive thyrocalcitonin hormone, and parathyroid hormone.
- Comparison of hormone concentrations between hypocalcemic and normocalcemic infants in preterm and full-term groups.
Main Results:
- Preterm infants with hypocalcemia showed significantly higher thyrocalcitonin hormone levels in early life compared to normocalcemic preterm infants.
- Parathyroid hormone levels were similar in both hypocalcemic and normocalcemic preterm infants.
- No significant differences in thyrocalcitonin hormone or parathyroid hormone patterns were observed between hypocalcemic and normocalcemic full-term infants.
Conclusions:
- Early hypocalcemia in preterm infants appears primarily driven by hyperthyrocalcitoninaemia.
- A non-hormonal pathogenesis is suggested for early hypocalcemia in small for gestational age, full-term infants.
- Distinct mechanisms underlie neonatal hypocalcemia in different low birthweight populations.
Abstract:
During the first week of life serum calcium, phosphorus, magnesium, immunoreactive thyrocalcitonin hormone, and parathyroid hormone concentrations were determined daily in 36 preterm and 29 small for gestational age, full term, healthy infants. Preterm babies with early neonatal hypocalcaemia had significantly higher concentrations of serum thyrocalcitonin hormone in the first four days of life than normocalcaemic preterm babies. Parathyroid hormone concentrations were similar in hypocalcaemic and normocalcaemic infants. In contrast, in the full term group no significant differences were detected in thyrocalcitonin hormone and parathyroid hormone patterns between hypocalcaemic and normocalcaemic subjects. This suggests two different pathogeneses for early hypocalcaemia in low birthweight infants. Hyperthyrocalcitoninaemia seems to be the main determining factor in preterm infants, while a non-hormonal pathogenesis should be considered in full term infants who are small for gestational age.