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  2. Hypothyroidism in dogs - Wikipedia

    en.wikipedia.org/wiki/Hypothyroidism_in_dogs

    Dogs being treated with anticonvulsant medications that lower serum thyroxine levels such as phenobarbital do not appear to cause any symptoms of hypothyroidism. [ 2 ] Euthyroid sick syndrome, also known as nonthyroidal illness syndrome, is a term to describe when a euthyroid patient has low levels of serum thyroid hormone due to nonthyroidal ...

  3. Hypersomatotropism (veterinary) - Wikipedia

    en.wikipedia.org/wiki/Hypersomatotropism...

    Dogs with primary hypothyroidism also have increased levels of growth hormone and IGF-1; however, thyroxine and thyroid stimulating hormone levels are normal in dogs with hypersomatotropism. [ 1 ] Progestogens administered to dogs may result in endogenous adrenocorticotropic hormone secretion being suppressed, which lowers the cortisol ...

  4. Hypothyroidism - Wikipedia

    en.wikipedia.org/wiki/Hypothyroidism

    Subclinical hypothyroidism is a biochemical diagnosis characterized by an elevated serum TSH level, but with a normal serum free thyroxine level. [48] [49] [50] The incidence of subclinical hypothyroidism is estimated to be 3-15% and a higher incidence is seen in elderly people, females and those with lower iodine levels. [48]

  5. Thyroxine - Wikipedia

    en.wikipedia.org/wiki/Thyroxine

    Thyroxine, also known as T 4, is a hormone produced by the thyroid gland. It is the primary form of thyroid hormone found in the blood and acts as a prohormone of the more active thyroid hormone, triiodothyronine (T 3 ). [ 1 ]

  6. Hyperthyroidism - Wikipedia

    en.wikipedia.org/wiki/Hyperthyroidism

    In overt primary hyperthyroidism, TSH levels are low and T 4 and T 3 levels are high. Subclinical hyperthyroidism is a milder form of hyperthyroidism characterized by low or undetectable serum TSH level, but with a normal serum free thyroxine level. [32]

  7. Greyhound - Wikipedia

    en.wikipedia.org/wiki/Greyhound

    Thyroxine levels in the Greyhound are below the normal reference range for dogs; thyroxine response to thyroid-stimulating hormone is also lowered. This can impact testing for thyroid disease but it is not a concern for health. [56]

  8. Thyrotoxic myopathy - Wikipedia

    en.wikipedia.org/wiki/Thyrotoxic_myopathy

    To understand how high levels of thyroxine can be toxic and lead to thyrotoxic myopathy physiologically, consider basic neuromuscular junction function. Under normal circumstances, muscle contraction occurs when electrical impulses travel down descending axons from the brain or spinal cord towards the neuromuscular junction .

  9. Thyrotoxic periodic paralysis - Wikipedia

    en.wikipedia.org/wiki/Thyrotoxic_periodic_paralysis

    These are normal in the other forms, and in thyrotoxicosis the levels of thyroxine and triiodothyronine are elevated, with resultant suppression of TSH production by the pituitary gland. [1] [6] Various other investigations are usually performed to separate the different causes of hyperthyroidism. [6]