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One-hour PTH after thyroidectomy predicts symptomatic hypocalcemia.

Michael G White1, Benjamin C James1, Cheryl Nocon2

  • 1Endocrine Surgery Research Group in the Department of Surgery, The University of Chicago Medicine 5841 S. Maryland Ave MC 4052, Chicago IL 60637.

The Journal of Surgical Research
|March 30, 2016
PubMed
Summary

A 1-hour postoperative parathyroid hormone (PTH) test in the postanesthesia care unit (PACU) effectively predicts symptomatic hypocalcemia after total thyroidectomy, similar to testing on postoperative day 1.

Keywords:
CalciumHypocalcemiaPTHSymptomatic hypocalcemiaThyroidectomy

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Area of Science:

  • Endocrinology
  • Surgical Oncology
  • Neurosurgery

Background:

  • Hypocalcemia is a significant morbidity following total thyroidectomy.
  • Current methods for predicting hypocalcemia lack clear timing and optimal use.
  • Early identification of at-risk patients is crucial for preventing complications.

Purpose of the Study:

  • To evaluate the utility of 1-hour postanesthesia care unit (PACU) parathyroid hormone (PTH) levels in predicting symptomatic hypocalcemia after total thyroidectomy.
  • To compare the predictive value of early postoperative PTH with later measurements.

Main Methods:

  • A prospective study of 196 patients undergoing total thyroidectomy.
  • Serum calcium and PTH levels measured 1 hour post-surgery (PACU) and on postoperative day 1 (POD1).
  • Data collected on central compartment lymph node dissection, parathyroid autotransplantation, and final pathology.

Main Results:

  • Nine patients (4.6%) developed symptomatic hypocalcemia.
  • A 1-hour PACU PTH level of ≤10 pg/dL was observed in 17.3% of patients.
  • Central compartment dissection and parathyroid autotransplantation were associated with symptomatic hypocalcemia.
  • Biochemical hypocalcemia was not predictive of symptoms in the immediate postoperative period.

Conclusions:

  • One-hour PACU PTH levels are as effective as POD1 PTH in predicting symptomatic hypocalcemia.
  • Surgical factors like lymph node dissection and autotransplantation increase the risk of symptomatic hypocalcemia.
  • Biochemical screening alone may not fully predict immediate postoperative symptoms.