Abstract
After thyroidectomy there is an appreciable incidence of hypothyroidism as judged by FT4I estimates. Pharmacological doses of iodine (10-300 mg/day) usually suppress, whereas physiological doses of iodine (< 5 mg/day) have been reported to both decrease and increase thyroid function. The value of iodine supplementation in preventing post-thyroidectomy hypothyroidism was assessed in a prospective randomised trial. A series of 55 patients with a TSH > 6 mU/l 1 month after bilateral subtotal thyroidectomy or unilateral lobectomy for benign disease were randomised to receive either chloroform water 5 ml/day (placebo) or chloroform water 5 ml/day with 1 mg of iodine to be taken for 20 weeks. With placebo, 62% of bilateral subtotal thyroidectomies were euthyroid at 6 months on no thyroid replacement, while with iodine all were hypothyroid as judged by FT4I. After bilateral subtotal thyroidectomy, the recovery of remnant function is delayed by an iodine supplement of 1 mg/day.
Full text
PDF



Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Alexander W. D., Harden R. M., Koutras D. A., Wayne E. Influence of iodine intake after treatment with antithyroid drugs. Lancet. 1965 Oct 30;2(7418):866–868. doi: 10.1016/s0140-6736(65)92501-8. [DOI] [PubMed] [Google Scholar]
- Braverman L. E., Ingbar S. H., Vagenakis A. G., Adams L., Maloof F. Enhanced susceptibility to iodide myxedema in patients with Hashimoto's disease. J Clin Endocrinol Metab. 1971 Apr;32(4):515–521. doi: 10.1210/jcem-32-4-515. [DOI] [PubMed] [Google Scholar]
- Braverman L. E., Woeber K. A., Ingbar S. H. Induction of myxedema by iodide in patients euthyroid after radioiodin or surgical treatment of diffuse toxic goiter. N Engl J Med. 1969 Oct 9;281(15):816–821. doi: 10.1056/NEJM196910092811504. [DOI] [PubMed] [Google Scholar]
- Cusick E. L., Krukowski Z. H., Matheson N. A. Outcome of surgery for Graves' disease re-examined. Br J Surg. 1987 Sep;74(9):780–783. doi: 10.1002/bjs.1800740909. [DOI] [PubMed] [Google Scholar]
- Delange F., Bürgi H. Iodine deficiency disorders in Europe. Bull World Health Organ. 1989;67(3):317–325. [PMC free article] [PubMed] [Google Scholar]
- Ermans A. M., Camus M. Modifications of thyroid function induced by chronic administration of iodide in the presence of "autonomous" thyroid tissue. Acta Endocrinol (Copenh) 1972 Jul;70(3):463–475. doi: 10.1530/acta.0.0700463. [DOI] [PubMed] [Google Scholar]
- Fradkin J. E., Wolff J. Iodide-induced thyrotoxicosis. Medicine (Baltimore) 1983 Jan;62(1):1–20. doi: 10.1097/00005792-198301000-00001. [DOI] [PubMed] [Google Scholar]
- Fragu P., Schlumberger M., Tubiana M. Thyroid iodine content and serum thyroid hormone levels in autoimmune thyroiditis: effect of iodide supplementation. J Nucl Med. 1985 Feb;26(2):133–139. [PubMed] [Google Scholar]
- Franklyn J. A., Daykin J., Drolc Z., Farmer M., Sheppard M. C. Long-term follow-up of treatment of thyrotoxicosis by three different methods. Clin Endocrinol (Oxf) 1991 Jan;34(1):71–76. doi: 10.1111/j.1365-2265.1991.tb01738.x. [DOI] [PubMed] [Google Scholar]
- Lima N., Medeiros-Neto G. Transient thyrotoxicosis in endemic goitre patients following exposure to a normal iodine intake. Clin Endocrinol (Oxf) 1984 Dec;21(6):631–637. doi: 10.1111/j.1365-2265.1984.tb01405.x. [DOI] [PubMed] [Google Scholar]
- Melliere D., Etienne G., Becquemin J. P. Operation for hyperthyroidism. Methods and rationale. Am J Surg. 1988 Mar;155(3):395–399. doi: 10.1016/s0002-9610(88)80098-9. [DOI] [PubMed] [Google Scholar]
- Miller J. M., Block M. A. Functional autonomy in multinodular goiter. JAMA. 1970 Oct 19;214(3):535–539. [PubMed] [Google Scholar]
- Pennington J. A. A review of iodine toxicity reports. J Am Diet Assoc. 1990 Nov;90(11):1571–1581. [PubMed] [Google Scholar]
- Reid D. J. Hyperthyroidism and hypothyroidism complicating the treatment of thyrotoxicosis. Br J Surg. 1987 Nov;74(11):1060–1062. doi: 10.1002/bjs.1800741133. [DOI] [PubMed] [Google Scholar]
- Ross D. S., Daniels G. H., De Stefano P., Maloof F., Ridgway E. C. Use of adjunctive potassium iodide after radioactive iodine (131I) treatment of Graves' hyperthyroidism. J Clin Endocrinol Metab. 1983 Aug;57(2):250–253. doi: 10.1210/jcem-57-2-250. [DOI] [PubMed] [Google Scholar]
- Silva J. E. Effects of iodine and iodine-containing compounds on thyroid function. Med Clin North Am. 1985 Sep;69(5):881–898. doi: 10.1016/s0025-7125(16)30995-6. [DOI] [PubMed] [Google Scholar]
- Tajiri J., Higashi K., Morita M., Umeda T., Sato T. Studies of hypothyroidism in patients with high iodine intake. J Clin Endocrinol Metab. 1986 Aug;63(2):412–417. doi: 10.1210/jcem-63-2-412. [DOI] [PubMed] [Google Scholar]
- Vagenakis A. G., Wang C. A., Burger A., Maloof F., Braverman L. E., Ingbar S. H. Iodide-induced thyrotoxicosis in Boston. N Engl J Med. 1972 Sep 14;287(11):523–527. doi: 10.1056/NEJM197209142871101. [DOI] [PubMed] [Google Scholar]
- Vidor G. I., Stewart J. C., Wall J. R., Wangel A., Hetzel B. S. Pathogenesis of iodine-induced thyrotoxicosis: studies in northern Tasmania. J Clin Endocrinol Metab. 1973 Dec;37(6):901–909. doi: 10.1210/jcem-37-6-901. [DOI] [PubMed] [Google Scholar]
- Wahl R. A., Joseph K., Bögner E., Ohmann C., Goretzki P., Röher H. D. Thyroid function after surgery for autonomous and non-autonomous nodular endemic goitre--effect of iodide-substitution. Klin Wochenschr. 1985 Sep 2;63(17):812–820. doi: 10.1007/BF01732286. [DOI] [PubMed] [Google Scholar]
