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26.10.2016 | ORIGINAL ARTICLE | Ausgabe 2/2017 Open Access

Langenbeck's Archives of Surgery 2/2017

Hypoparathyroidism after total thyroidectomy in patients with previous gastric bypass

Zeitschrift:
Langenbeck's Archives of Surgery > Ausgabe 2/2017
Autoren:
Raoul A. Droeser, Johan Ottosson, Andreas Muth, Hella Hultin, Karin Lindwall-Åhlander, Anders Bergenfelz, Martin Almquist
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s00423-016-1517-x) contains supplementary material, which is available to authorized users.

Abstract

Purpose

Case reports suggest that patients with previous gastric bypass have an increased risk of severe hypocalcemia after total thyroidectomy, but there are no population-based studies. The prevalence of gastric bypass before thyroidectomy and the risk of hypocalcemia after thyroidectomy in patients with previous gastric bypass were investigated.

Methods

By cross-linking The Scandinavian Quality Registry for Thyroid, Parathyroid and Adrenal Surgery with the Scandinavian Obesity Surgery Registry patients operated with total thyroidectomy without concurrent or previous surgery for hyperparathyroidism were identified and grouped according to previous gastric bypass. The risk of treatment with intravenous calcium during hospital stay, and with oral calcium and vitamin D at 6 weeks and 6 months postoperatively was calculated by using multiple logistic regression in the overall cohort and in a 1:1 nested case-control analysis.

Results

We identified 6115 patients treated with total thyroidectomy. Out of these, 25 (0.4 %) had undergone previous gastric bypass surgery. In logistic regression, previous gastric bypass was not associated with treatment with i.v. calcium (OR 2.05, 95 % CI 0.48–8.74), or calcium and/or vitamin D at 6 weeks (1.14 (0.39–3.35), 1.31 (0.39–4.42)) or 6 months after total thyroidectomy (1.71 (0.40–7.32), 2.28 (0.53–9.75)). In the nested case-control analysis, rates of treatment for hypocalcemia were similar in patients with and without previous gastric bypass.

Conclusion

Previous gastric bypass surgery was infrequent in patients undergoing total thyroidectomy and was not associated with an increased risk of postoperative hypocalcemia.

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