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Hypocalcemia in the newborn
R Aggarwal1, M Upadhyay, A K Deorari
1Division of Neonatology, Department of Pediatrics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India.
Insights
Newborns experience a natural drop in serum calcium levels within 48 hours. High-risk infants may develop early hypocalcemia requiring prompt calcium treatment, while ionized calcium is key for diagnosis.
Area of Science:
- Neonatal physiology and endocrinology
- Pediatric critical care
Background:
- Healthy term infants typically reach a physiological nadir in serum calcium levels between 24-48 hours of age.
- This nadir is potentially linked to a delayed hormonal response involving parathyroid hormone and calcitonin in newborns.
- Certain high-risk neonates, including infants of diabetic mothers, preterm infants, and those with perinatal asphyxia, are susceptible to hypocalcemic levels during this period.
Purpose of the Study:
- To describe the physiological nadir of serum calcium in healthy term newborns.
- To differentiate between early-onset and late-onset hypocalcemia in neonates.
- To highlight the importance of ionized calcium over total serum calcium for accurate diagnosis.
Main Methods:
- Review of physiological processes in neonatal calcium homeostasis.
- Analysis of factors contributing to hypocalcemia in high-risk neonatal populations.
- Discussion of diagnostic criteria and treatment durations for early and late-onset hypocalcemia.
Main Results:
- Early-onset hypocalcemia, presenting within 72 hours, necessitates calcium supplementation for at least 72 hours.
- Late-onset hypocalcemia, typically appearing after 7 days, requires extended long-term therapy.
- Ionized calcium levels are critical for biochemical functions and are a more reliable diagnostic marker than total serum calcium.
Conclusions:
- Understanding the timing and risk factors for neonatal hypocalcemia is crucial for timely intervention.
- Appropriate calcium supplementation protocols should be based on the onset and duration of hypocalcemia.
- Accurate diagnosis of hypocalcemia relies on measuring ionized calcium levels.
Abstract:
Healthy term babies undergo a physiological nadir in serum calcium levels by 24-48 hours of age. This nadir may be related to the delayed response of parathyroid and calcitonin hormones in a newborn. This nadir may drop to hypocalcemic levels in high-risk neonates including infants of diabetic mothers, preterm infants and infants with perinatal asphyxia. This early onset hypocalcemia which presents within 72 hours, requires treatment with calcium supplementation for at least 72 hours. In contrast late onset hypocalcemia usually presents after 7 days and requires long term therapy. Ionized calcium is crucial for many biochemical processes and total serum calcium is a poor substitute for the diagnosis of hypocalcemia.