Correlating pre-operative vitamin D status with post-thyroidectomy hypocalcemia

Area of Science:

• Endocrinology
• Surgical Oncology
• Nutritional Science

Background:

• Post-thyroidectomy hypocalcemia is a common complication.
• Vitamin D plays a crucial role in calcium homeostasis.
• Pre-operative nutritional status may influence surgical outcomes.

Purpose of the Study:

• To investigate the association between pre-operative vitamin D levels and the incidence of post-thyroidectomy hypocalcemia.
• To determine if vitamin D repletion impacts hypocalcemia risk.
• To explore predictors of hypocalcemia following thyroidectomy.

Main Methods:

• Retrospective analysis of 264 patients undergoing total or completion thyroidectomy.
• Inclusion criteria: recorded 25-hydroxyvitamin D (25[OH]D) levels, no pre-existing parathyroid disorders, and no pre-operative calcitriol use.
• Assessment of pre-operative 25(OH)D, concurrent neck dissection, parathyroid gland integrity, post-operative PTH, calcium nadir, and length of stay.

Main Results:

• Mean pre-operative 25(OH)D was 25 ng/mL; overall hypocalcemia rate was 37.5%.
• Low pre-operative 25(OH)D did not predict hypocalcemia (P = .96) but predicted the need for 1,25-dihydroxyvitamin D3 (calcitriol) (P = .01).
• Lower post-operative parathyroid hormone (PTH) levels were significantly associated with hypocalcemia (P = .001).

Conclusions:

• Pre-operative vitamin D status does not predict post-thyroidectomy hypocalcemia.
• Low 25(OH)D levels predict the need for calcitriol therapy in hypocalcemic patients.
• Pre-operative assessment and repletion of vitamin D are recommended for patients undergoing total thyroidectomy.