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Early prediction of hypocalcemia following total thyroidectomy using combined intact parathyroid hormone and serum calcium measurement

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Abstract

Backgrounds

Concomitant intact parathyroid hormone (iPTH) and serum calcium measurement is deemed to be useful in predicting hypocalcemia after total thyroidectomy. This study aimed to prospectively assess the diagnostic accuracy of combined iPTH and serum calcium measurement in predicting early postoperative hypocalcemia.

Methods

From January 2010 to January 2011, 112 patients underwent total thyroidectomy in our department. A prospective study was carried out to search for factors predicting postoperative hypocalcemia. Serum calcium, phosphorus, and iPTH levels have been measured before operation and at 6, 24, and 48 h postoperatively. Hypocalcemia was defined as a serum calcium level less than 8.0 mg/dL. Sensitivity and specificity of different serum measurements have been calculated using the receiver–operator characteristics curve.

Results

Thirty-three patients (29.5 %) had transient postoperative hypocalcemia. Serum iPTH level showed the highest sensitivity and specificity in predicting hypocalcemia after 6 h (84.8 % and 93.7 %, respectively) for a criterion value ≤12.1 pg/mL. Serum calcium level showed the highest sensitivity and specificity after 24 h (93.9 and 100.0 %, respectively) for a criterion value ≤7.97 mg/dL. Combined cutoffs of 6-h iPTH and 24-h serum calcium showed sensitivity and specificity of 100.0 %.

Conclusions

The combined measurement of 6-h iPTH and 24-h serum calcium are highly predictive of early postoperative hypocalcemia. Patients with serum iPTH and calcium level ≤ criterion value are at major risk for developing hypocalcemia. These results are important in selecting patients eligible for early discharge and those patients who need calcium and vitamin D supplementation.

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Acknowledgments

This study was supported by a grant from the University of Cagliari, Italy (quota ex 60 %).

Conflicts of interest

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Authors and Affiliations

  1. Department of Surgery, Clinica Chirurgica, University of Cagliari, Monserrato, Italy

    Adolfo Pisanu, Alessandra Saba & Alessandro Uccheddu

  2. Department of Laboratory Medicine, Ospedale San Giovanni di Dio, Azienda Ospedaliero-Universitaria di Cagliari, Cagliari, Italy

    Ferdinando Coghe

  3. Clinica Chirurgica, University of Cagliari, Azienda Ospedaliero-Universitaria, Presidio Policlinico di Monserrato, Blocco G, SS 554 km 4,500, 09042, Monserrato, Cagliari, Italy

    Adolfo Pisanu

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  1. Adolfo Pisanu
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  2. Alessandra Saba
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  4. Alessandro Uccheddu
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Correspondence to Adolfo Pisanu.

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Pisanu, A., Saba, A., Coghe, F. et al. Early prediction of hypocalcemia following total thyroidectomy using combined intact parathyroid hormone and serum calcium measurement. Langenbecks Arch Surg 398, 423–430 (2013). https://doi.org/10.1007/s00423-012-1017-6

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  • DOI: https://doi.org/10.1007/s00423-012-1017-6

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