Phase II randomized study of preoperative calcitriol to prevent hypocalcemia following thyroidectomy

Background A prospective, stratified, randomized, double‐blind, placebo‐controlled study was conducted to observe the impact of preoperative calcitriol supplementation on serum calcium levels following total thyroidectomy. Methods Subjects were randomized 1:1 to receive 1 μg calcitriol or placebo for 1 week preceding thyroidectomy. The primary outcome measure was change in serum calcium from baseline to 18 h post‐thyroidectomy. Subjects were also assessed for incidence of symptomatic hypocalcemia, length of stay, readmission for hypocalcemia, and intravenous calcium supplementation. Results Forty‐seven patients underwent thyroidectomy; 23 received preoperative calcitriol supplementation, and 24 received placebo. Repeated measures regression demonstrated no difference in postoperative serum calcium over time (p = 0.22). There were no occurrences of hypocalcemia, intravenous calcium supplementation, or readmission in either group. No difference was observed in length of stay (p = 0.38). One patient in the calcitriol group developed Grade 3 hypercalcemia. Conclusions Preoperative calcitriol supplementation had no impact on postoperative serum calcium levels compared to placebo.