Topic summary
Thyrotropic feedback control
Extracted from the Wikipedia article Hypothalamic–pituitary–thyroid axis.
Functional states of thyrotropic feedback control
- Euthyroidism: Normal thyroid function
- Hypothyroidism: Reduced thyroid function
- primary hypothyroidism: Feedback loop interrupted by low thyroid secretory capacity, e.g. after thyroid surgery or in case of autoimmune thyroiditis
- secondary hypothyroidism: Feedback loop interrupted on the level of pituitary, e.g. in anterior pituitary failure
- tertiary hypothyroidism: Lacking stimulation by TRH, e.g. in hypothalamic failure, Pickardt–Fahlbusch syndrome or euthyroid sick syndrome.