[Parathyroid hormone as a predictor of post-thyroidectomy hypocalcemia]

Area of Science:

• Endocrinology
• Surgical Oncology
• Clinical Chemistry

Background:

• Prolonged hospitalization after total thyroidectomy is often due to hypocalcemia.
• Accurate prediction of post-thyroidectomy hypocalcemia is crucial for patient management and hospital resource optimization.

Purpose of the Study:

• To validate parathyroid hormone (PTH) measurement for predicting hypocalcemia after total thyroidectomy.
• To determine the optimal timing and cutoff point for PTH measurement to predict post-surgical hypocalcemia.

Main Methods:

• Prospective study of 82 patients undergoing total or completion thyroidectomy.
• Measurement of pre-operative, immediate post-operative, and delayed serum parathyroid hormone (PTH) and calcium levels.
• Exclusion of patients with conditions affecting calcium homeostasis.

Main Results:

• A decrease of 80% or higher in delayed PTH levels demonstrated 100% sensitivity and 87% specificity for predicting hypocalcemia, enabling early discharge for 73.2% of patients.
• A 98% decrease in delayed PTH levels showed 98.6% specificity for identifying patients requiring early calcium replacement.

Conclusions:

• Postoperative delayed parathyroid hormone (PTH) level decrease is a reliable predictor of post-thyroidectomy hypocalcemia.
• An 80% or greater decrease in delayed PTH is highly sensitive and specific for selecting patients for early discharge.
• A 98% cutoff for delayed PTH decrease is effective in identifying patients needing early calcium supplementation.