Early detection of hypocalcemia after total/completion thyroidectomy: routinely usable algorithm based on serum...

Area of Science:

• Endocrinology
• Surgical Oncology
• Biochemistry

Background:

• Postoperative hypocalcemia is a common complication following thyroidectomy.
• Accurate and timely detection of hypocalcemia is crucial for patient management and safe discharge.

Purpose of the Study:

• To investigate serum calcium and phosphorus levels after thyroidectomy.
• To develop a reliable and cost-effective algorithm for detecting patients at risk of hypocalcemia.

Main Methods:

• Prospective observational study of 136 patients undergoing thyroidectomy.
• Serum calcium and phosphorus levels measured preoperatively and at 6, 12, 20, and 48 hours postoperatively.
• Hypocalcemia defined as serum calcium ≤1.9 mmol/L or symptomatic hypocalcemia.

Main Results:

• Twenty-four percent of patients developed hypocalcemia.
• Serum calcium levels at 12 and 20 hours were significantly lower than at 6 hours.
• The difference between H20 and preoperative calcium levels showed the highest accuracy (AUC=0.87) for hypocalcemia detection.

Conclusions:

• A novel algorithm using H20 calcium levels and the H20-preoperative difference achieves 100% sensitivity and 88.4% specificity for detecting severe hypocalcemia.
• This algorithm facilitates early and safe patient discharge, particularly when parathyroid hormone assays are unavailable or costly.
• Phosphorus levels were not effective in predicting hypocalcemia.