Thyroid hormone suppression imaging

Thyroid hormone inhibition imaging is an examination method for the identification of functional autonomous adenomas and non-functional autonomous adenomas. The principle of measurement is that under normal circumstances, thyroid hormone ↑→ (negative feedback regulation)→pituitary TSH secretion ↓→thyroid iodine rate ↓; abnormal conditions (such as hyperthyroidism) thyroid function is no longer regulated by pituitary TSH, exogenous thyroid hormone no longer has Feedback inhibition. Basic Information Specialist Category: Otolaryngology Classification: Radionuclide Applicable gender: whether men and women apply fasting: not fasting Tips: Pay attention to the normal diet before the examination, pay attention to normal work and rest, and prevent endocrine disorders. Normal value The inhibition rate is >50%, and the thyroid iodine function is inhibited, indicating that the thyroid function is normal; Inhibition rate <25%, or inhibition, in line with the diagnosis of hyperthyroidism; The inhibition rate is between 25% and 50%, which is mildly inhibited, and anti-thyroid drug test treatment can be considered. Clinical significance Abnormal result (1) The differential diagnosis of hyperthyroidism and simple goiter is less than 50%, or not inhibited, and the diagnostic coincidence rate is 95%. The latter inhibition rate is greater than 50%. (2) The diagnosis of functional autonomic thyroid tumor is not inhibited. (3) Prognosis evaluation of anti-thyroid drug treatment If it can be inhibited to reach the normal range, the possibility of recurrence after stopping the drug is small. (4) The differential diagnosis between the endocrine exophthalmos and the orbital tumor caused by the eye is not inhibited, and the latter can be inhibited. Hyperthyroidism is referred to as hyperthyroidism, also known as toxic diffuse goiter, Graves disease, and is an autoimmune disease. Can be afraid of heat, sweating, agitation, excessive appetite, with weight loss, tachycardia, special eye signs (exophthalmos), goiter, thyroid murmur, tremor and other performance. People who need to be examined: patients with excessive appetite, with symptoms of hyperthyroidism such as weight loss, tachycardia, special eye signs (exophthalmos), goiter, and thyroid murmur. Precautions Forbidden before examination: pay attention to normal diet, pay attention to normal work and rest, and prevent endocrine disorders. Requirements for inspection: Actively cooperate with the doctor's request. Inspection process test methods: The conventional 131I test was performed to measure the 131I rate at 24 hours; Oral thyroid tablets, 120 ~ 180mg / day, 2 weeks; The 131I test was repeated, and the 131I inhibition rate was calculated by measuring the 131I rate at 24 hours. Not suitable for the crowd Inappropriate crowd: temporarily unknown. Adverse reactions and risks Nothing.

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