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Background. Late transient neonatal hypocalcemia with hyperphosphatemia is potentially life-threatening. The use of 1.25 dihydroxycholecalciferol in the management of neonatal hypocalcemia is unexplored. Objective. We hypothesized adding 1.25 dihydroxycholecalciferol to intravenous continuous calcium infusion (CaI) will achieve accelerated correction of hypocalcemia. Design/Methods. A controlled double-blind randomized placebo group was organized to compare the addition of 1.25 dihydroxycholecalciferol to CaI in 3&#x2013;14 day old neonates presenting with hypocalcemia, hyperphosphatemia and seizures. Ionized calcium and phosphorus were measured to adjust CaI and maintain eucalcemia. Time to resolution of hypocalcemia was defined as time from starting CaI to the first ionized calcium of &#x2265;1.1&#x2009;mmol/L. CaI was discontinued when ionized calcium levels were &#x2265;1.1&#x2009;mmol/L on two measurements and the infant tolerated feeds. Results. Fourteen neonates were studied without statistical difference between groups. Time to correction of hypocalcemia for 1,25 dihydroxycholecalciferol versus placebo was 7.2&#x2009;&#x00B1;&#x2009;1.9 versus 11.5&#x2009;&#x00B1;&#x2009;3.4 hours respectively (p=.26). The duration of CaI was 15.0&#x2009;&#x00B1;&#x2009;1.5 versus 24.8&#x2009;&#x00B1;&#x2009;4.4 hours respectively (p=.012). Conclusions. The addition of 1.25 dihydroxycholecalciferol to standard CaI therapy reduced the duration of CaI, but did not reduce the time to correct hypocalcemia in neonates with late transient hypocalcemia

Effects of 1,25-Dihydroxycholecalciferol on Recovery and Resolution of Late Transient Neonatal Hypocalcemia