Post-Operative Permanent Hypoparathyroidism and Preoperative Vitamin D Prophylaxis

Area of Science:

• Endocrinology
• Surgical Complications
• Nutritional Science

Background:

• Permanent hypoparathyroidism is a significant complication following total thyroidectomy, leading to increased patient morbidity and long-term medical management.
• Current strategies to mitigate this complication are limited, highlighting the need for effective preventive measures.

Purpose of the Study:

• To investigate the efficacy of preoperative high-dose vitamin D loading in reducing the incidence of permanent hypoparathyroidism after total thyroidectomy.
• To evaluate the predictive utility of postoperative day 1 parathyroid hormone (PTH) levels for permanent hypoparathyroidism.

Main Methods:

• A subgroup analysis from the multicentre, randomised, double-blind, placebo-controlled VItamin D In Thyroidectomy (VIDIT) trial involving 150 patients.
• Patients received either 300,000 IU of oral cholecalciferol or a placebo one week before total thyroidectomy.
• Permanent hypoparathyroidism was defined as the need for activated vitamin D six months postoperatively; patients were assessed via telephonic questionnaire.

Main Results:

• Permanent hypoparathyroidism occurred in 8.5% of 130 assessable patients.
• The incidence was 5.3% in the cholecalciferol group versus 11% in the placebo group, a non-significant difference (p = 0.34).
• No significant relationship was found between day 1 PTH levels and permanent hypoparathyroidism (p ≥ 0.99).

Conclusions:

• Preoperative high-dose vitamin D loading did not significantly decrease the incidence of permanent hypoparathyroidism after total thyroidectomy.
• Postoperative day 1 PTH levels appear to have limited predictive value for permanent hypoparathyroidism, potentially being more relevant for transient cases.