Prediction of post-idroidectomy hypocalcemia through rapid PTH determination

Area of Science:

• Endocrinology
• Surgical Complications
• Biochemistry

Background:

• Hypocalcemia is the most frequent complication following thyroidectomy.
• Identifying biochemical risk factors is crucial for managing this complication.

Purpose of the Study:

• To identify biochemical risk factors for hypocalcemia after thyroidectomy.
• To evaluate the utility of perioperative intact parathyroid hormone (PTHi) and postoperative calcemia levels in predicting hypocalcemia.

Main Methods:

• A consecutive series of 310 total thyroidectomies were analyzed.
• Intact parathyroid hormone (PTHi) levels were measured at anesthetic induction and 10 minutes post-surgery.
• Serum calcemia was measured every 12 hours post-surgery. A control group of hemithyroidectomies was included.

Main Results:

• 34.9% of patients developed hypocalcemia post-thyroidectomy.
• A combination of a 60% drop in PTHr or calcemia < 7.4 mg/dl at 24 hours achieved 100% sensitivity for predicting hypocalcemia.
• Significant differences in postoperative calcemia and PTHr were observed compared to the control group (p < 0.001).

Conclusions:

• Total thyroidectomy impacts parathyroid function, leading to decreased PTHr and increased risk of hypocalcemia.
• The combined PTHr decrease of 60% or calcemia < 7.4 mg/dl at 24 hours is a highly sensitive predictor of hypocalcemia risk.