Hypoparathyroidism after total thyroidectomy in patients with previous gastric bypass

Research output: Contribution to journalArticle


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.


External organisations
  • Örebro University
  • Uppsala University Hospital
  • Gävle Hospital
  • Skåne University Hospital
  • University of Gothenburg
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Surgery
  • Endocrinology and Diabetes


  • Cohort study, Gastric bypass, Postoperative hypoparathyroidism, Total thyroidectomy
Original languageEnglish
Pages (from-to)273-280
Number of pages8
JournalLangenbeck's Archives of Surgery
Issue number2
Early online date2016 Oct 26
Publication statusPublished - 2017 Mar
Publication categoryResearch