The American journal of the medical sciences
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Case Reports
An unusual cause of thyrotoxic periodic paralysis: triiodothyronine-containing weight reducing agents.
Thyrotoxic periodic paralysis resulting from exogenous thyroid hormone administration (thyrotoxicosis factitia) has been rarely reported. We describe a 23-year-old man who presented with limbs paralysis upon awakening in the morning. Pertinent history revealed that he took drugs containing triiodothyronine (64 mug) and propranolol (40 mg) twice daily for weight reduction in the past month and discontinued these drugs 3 days before admission. ⋯ Despite normal serum free triiodothyronine and thyroxine levels, the suppressed concentration of thyroid stimulating hormone indicated hyperthyroidism. The low radioiodine uptake (4%) and serum thyroglobulin level (2 ng/mL) were consistent with thyrotoxicosis factitia. This is the first reported case of exogenous triiodothyronine-induced thyrotoxic periodic paralysis, which may have been precipitated by the withdrawal of propranolol.