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Elevated calcitonin gene-related peptide in polycythemic newborn infants
G Saggese1, S Bertelloni, G I Baroncelli
1Chair of Preventive Pediatrics, University of Pisa, Italy.
Insights
Calcitonin gene-related peptide (CGRP) levels are higher in newborns with polycythemia, potentially aiding circulatory adaptation. In some cases, elevated CGRP may contribute to hypocalcemia in these infants.
Area of Science:
- Neonatal physiology
- Endocrinology
Background:
- Polycythemia in newborns is a condition characterized by high blood viscosity.
- Circulatory adaptation to extrauterine life involves complex physiological adjustments.
Purpose of the Study:
- To investigate calcitonin gene-related peptide (CGRP) levels in polycythemic newborns.
- To explore the potential role of CGRP in circulatory adaptation and hypocalcemia in neonates.
Main Methods:
- Measurement of CGRP levels in umbilical cord blood and at 16-36 hours post-birth.
- Comparison of CGRP levels between 43 polycythemic newborns and 20 healthy controls.
Main Results:
- Significantly higher CGRP levels were observed in polycythemic neonates compared to controls at both time points.
- Five polycythemic infants (11.6%) who developed hypocalcemia exhibited greater CGRP elevations.
Conclusions:
- CGRP may play a role in the circulatory adaptation of newborns to extrauterine life.
- Elevated CGRP in polycythemic neonates might be a compensatory mechanism for blood hyperviscosity.
- High CGRP concentrations could potentially induce hypocalcemia in some polycythemic infants.
Abstract:
In this study, calcitonin gene-related peptide levels were measured in cord and at 16-36 h of extrauterine life in 43 polycythemic newborns; 20 healthy term infants were also studied as controls. Calcitonin gene-related peptide values were significantly higher in polycythemic neonates in comparison with controls both at delivery and at 16-36 h after birth. Five polycythemic (11.6%) infants who develop hypocalcemia had greater elevated calcitonin gene-related peptide concentrations. Our data suggest that calcitonin gene-related peptide may be implicated in the circulatory adaptation to extrauterine life. In polycythemic neonates, calcitonin gene-related peptide is probably increased to compensate for blood hyperviscosity; in some cases, high calcitonin gene-related peptide concentrations may induce hypocalcemia.