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Hypocalcaemia following thyroidectomy for thyrotoxicosis

A C See1, K C Soo

  • 1Department of Surgery, Singapore General Hospital, Singapore.

The British Journal of Surgery
|January 1, 1997
PubMed
Summary

Temporary hypocalcaemia is common after thyroidectomy. This study suggests "hungry bone syndrome" may be a key factor, not just parathyroid issues, in post-thyroidectomy patients.

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Area of Science:

  • Endocrinology
  • Surgical Complications
  • Calcium Metabolism

Background:

  • Temporary hypocalcaemia is a frequent complication after thyroidectomy for thyrotoxicosis.
  • While parathyroid gland injury is the usual cause, other factors like calcitonin release and hungry bone syndrome are considered.
  • Thyrotoxic osteodystrophy reversal can contribute to postoperative hypocalcaemia.

Purpose of the Study:

  • To investigate the causes of temporary hypocalcaemia following thyroidectomy.
  • To differentiate between parathyroid-related and other causes of hypocalcaemia post-thyroidectomy.

Main Methods:

  • Subtotal thyroidectomy was performed on 63 patients (51 for thyrotoxicosis, 12 for non-toxic goitre).
  • Postoperative parathyroid hormone levels were measured in all patients.
  • Preservation of at least three parathyroid glands was confirmed in 92% of cases.

Main Results:

  • Biochemical hypocalcaemia occurred in 46% of patients, and symptomatic hypocalcaemia in 21%.
  • No patient experienced permanent hypoparathyroidism.
  • Hypocalcaemia was significantly more common in thyrotoxic patients (27/51) than in non-toxic goitre patients (2/12).

Conclusions:

  • Hypoparathyroidism is not the primary cause of hypocalcaemia after thyroidectomy.
  • "Hungry bone syndrome" is identified as a significant contributing factor to postoperative hypocalcaemia.
  • Further research into non-parathyroid causes of hypocalcaemia post-thyroidectomy is warranted.

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