Perioperative parathyroid hormone levels in thyroid surgery

Area of Science:

• Endocrinology
• Surgical Oncology
• Neurosurgery

Background:

• Perioperative hypocalcemia is a frequent complication following thyroid surgery, often due to temporary parathyroid gland dysfunction.
• Currently, reliable cutoff values for parathyroid hormone (PTH) to predict hypocalcemia are lacking.

Purpose of the Study:

• To establish a criterion for predicting hypocalcemia after thyroid surgery based on various parathyroid hormone (PTH) levels.
• To determine the predictive value of different PTH levels for postoperative hypocalcemia.

Main Methods:

• A retrospective chart review of 80 patients undergoing thyroid surgery was conducted.
• Intraoperative and recovery room PTH levels, along with serial ionized calcium levels, were analyzed.
• Chi-square analysis and receiver operator characteristic (ROC) curves were used to evaluate PTH levels and predict hypocalcemia.

Main Results:

• 17.5% of patients developed hypocalcemia post-surgery; no permanent cases were reported.
• A PTH level below 15 pg/mL was significantly associated with the development of hypocalcemia (P < .01).
• ROC curve analysis demonstrated the ability to define various PTH cutoff values with differing sensitivities and specificities for hypocalcemia prediction.

Conclusions:

• Low perioperative PTH levels correlate with postoperative hypocalcemia but lack definitive predictive power alone.
• Receiver operator characteristic (ROC) curves provide a valuable tool for surgeons to select PTH cutoff values, balancing sensitivity and specificity for predicting hypocalcemia.