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Previous reports by us and other investigators showed that among athyreotic patients on levothyroxine (LT 4 ) following total thyroidectomy patients with normal serum thyroid-stimulating hormone (TSH) levels had mildly low serum free triiodothyronine (FT 3 ) levels, whereas patients with mildly suppressed serum TSH levels had normal serum FT 3 levels and patients with strongly suppressed serum TSH had elevated serum FT 3 levels. The objective of this study was to clarify which of these three patient groups are closer to their preoperative euthyroid condition based on reported subjective symptoms. We prospectively studied 148 consecutive euthyroid patients with papillary thyroid carcinoma who underwent a total thyroidectomy. Symptoms reflecting thyroid function documented preoperatively and following 12 months of LT 4 after thyroidectomy were compared. In 65 patients with strongly suppressed TSH levels significant changes in symptoms with tendencies towards thyrotoxicosis were seen with regards to heat and cold tolerance (p &lt; 0.01), bowel movements (p &lt; 0.05), and hand tremors (p &lt; 0.05). In 33 patients with normal TSH levels, significant changes in symptoms with tendencies towards hypothyroidism were seen with regards to heat and cold tolerance (p &lt; 0.05) and activity (p &lt; 0.05). Lastly, in 50 patients with mildly suppressed TSH levels and FT 3 levels equivalent to preoperative levels, all symptom items remained equivalent to their preoperative levels. Symptoms reflecting thyroid function in patients on LT 4 following total thyroidectomy suggested that patients with mildly suppressed TSH levels were closest to a euthyroid status. These data provide useful findings regarding the management of patients following total thyroidectomy.

Thyroid function related symptoms during levothyroxine monotherapy in athyreotic patients