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Development of hyperthyroidism following primary hypothyroidism: a case report
Yueh-Hua Chung1, Horng-Yih Ou, Ta-Jen Wu
1Division of Endocrinology and Metabolism, Department of Internal Medicine, National Cheng Kung University Hospital, Tainan, Taiwan.
The Kaohsiung Journal of Medical Sciences
|June 12, 2004
Summary
Development of hyperthyroidism after primary hypothyroidism is rare. This case highlights the complex interplay of thyroid-stimulating hormone receptor antibodies in this unusual transition.
Area of Science:
- Endocrinology
- Immunology
Background:
- Primary hypothyroidism is a common endocrine disorder.
- Development of hyperthyroidism following hypothyroidism is rare, with few documented cases.
- Thyroid-stimulating hormone receptor antibodies are implicated in the pathophysiology, but mechanisms remain unclear.
Observation:
- A 60-year-old man presented with hyponatremia and disturbed consciousness.
- Initial thyroid tests revealed primary hypothyroidism with high anti-microsomal antibody titers.
- Six years later, the patient developed symptoms of hyperthyroidism, including weight loss and exophthalmos.
Findings:
- Despite thyroxine treatment discontinuation, the patient remained thyrotoxic.
- Radioiodine uptake was elevated, consistent with hyperthyroidism.
- Methimazole therapy was initiated, leading to a euthyroid state.
Implications:
- This case underscores the potential for paradoxical progression from hypothyroidism to hyperthyroidism.
- It emphasizes the role of autoimmune mechanisms, likely involving thyroid-stimulating hormone receptor antibodies.
- Further research is needed to elucidate the exact pathophysiology of this rare condition.