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Prospective Evaluation of Perioperative Biochemical Tests to Predict Hypocalcemia After Total Thyroidectomy

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Abstract

Hypocalcemia is a common complication after total thyroidectomy. In these patients, the serum parathyroid hormone (PTH), calcium level decreases, and the phosphorus level increases. The level of fibroblast growth factor-23 (FGF-23), a phosphaturic hormone, increases in the serum to normalize the phosphorus level. In our study, we aimed to investigate the predictive value of PTH, calcium, phosphorus, 1,25-dihydroxy vitamin D (vitamin D), and FGF-23 tests in revealing patients who will develop hypocalcemia after thyroidectomy. Fifty-seven patients undergoing total thyroidectomy (fifty-two with multinodular goiter, three with Graves’ disease and two with papillary thyroid cancer) were included in this prospective study. Serum PTH, calcium, phosphorus, and vitamin D levels of the patients were measured preoperatively. Ten minutes after complete removal of the thyroid gland, intraoperative PTH (IOPTH) level was measured and the amount of decline in PTH level (PTH decline) was calculated. Postoperative PTH, calcium, phosphorus, vitamin D, and FGF-23 levels were measured 24 h after the operation. Postoperatively, hypocalcemia developed in 7 (12.3%) of the 57 patients. IOPTH, postoperative PTH, calcium, and vitamin D levels were significantly lower and PTH decline was significantly higher in patients with postoperative hypocalcemia. Postoperative FGF-23 levels were similar between the groups (p 0.952). When the IOPTH and postoperative serum calcium values were evaluated together, the highest sensitivity and positive predictive values were obtained (93.5% and 67.5%, respectively), The postoperative FGF-23 test was found to be rather unsatisfactory to reveal development of hypocalcemia (sensitivity of 14.3%). The success of detecting patients with hypocalcemia was highest when IOPTH and postoperative serum calcium levels were evaluated together. The FGF-23 measurements were found to be not sufficient in identifying hypocalcemic patients after total thyroidectomy.

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Authors and Affiliations

  1. Department of Surgery, Atatürk Training and Research Hospital, Izmir Katip Celebi University, 35340, Izmir, Turkey

    Yasin Peker, Necat Cin, Haldun Kar & Fatma Tatar

  2. Department of Biophysics, School of Medicine, Izmir Katip Celebi University, Izmir, Turkey

    Mehmet Cemal Kahya

  3. Department of Microbiology Laboratory, Atatürk Research and Training Hospital, Izmir Katip Celebi University, Izmir, Turkey

    Nurten Gülvardar Baran

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  1. Yasin Peker
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  2. Necat Cin
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  3. Haldun Kar
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  4. Fatma Tatar
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  5. Mehmet Cemal Kahya
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  6. Nurten Gülvardar Baran
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Correspondence to Yasin Peker.

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The local Ethics Committee of our hospital approved the study and all participants signed the informed consent form.

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The authors declare that they have no conflict of interest.

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Peker, Y., Cin, N., Kar, H. et al. Prospective Evaluation of Perioperative Biochemical Tests to Predict Hypocalcemia After Total Thyroidectomy. Indian J Surg 82, 187–190 (2020). https://doi.org/10.1007/s12262-019-01926-z

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  • DOI: https://doi.org/10.1007/s12262-019-01926-z

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