primary hypothyroidism


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Related to primary hypothyroidism: tertiary hypothyroidism

hypothyroidism

 [hi″po-thi´roi-dizm]
deficiency of thyroid gland activity, with underproduction of thyroxine, or the condition resulting from it. In its severe form it is called myxedema and is characterized by physical and mental sluggishness, obesity, loss of hair, enlargement of the tongue, and thickening of the skin. In children the condition is known as cretinism. Called also athyria. adj., adj hypothy´roid.
pituitary hypothyroidism secondary hypothyroidism caused by a defect or lesion of the pituitary gland that interferes with production of thyrotropin; the majority of cases are caused by tumors.
primary hypothyroidism hypothyroidism due to disease of the thyroid gland itself, usually accompanied by increased levels of thyrotropin.
secondary hypothyroidism that caused by thyrotropin deficiency.

primary hypothyroidism

Hypothyroidism due to failure of the thyroid gland to produce metabolically adequate amounts of thyroid hormones. It is the most common form of hypothyroidism.
See also: hypothyroidism

hypothyroidism

deficiency of thyroid gland activity, with underproduction of thyroxine, or the condition resulting from it. Common in adult dogs, particularly certain breeds, as a result of an idiopathic atrophy of the thyroid or a lymphocytic thyroiditis. Alopecia, weight gain, mental dullness, fatigue, cold intolerance, infertility and neurological deficits are seen. In food animals the syndrome is classical neonatal colloid goiter. See also goiter.

autoimmune hypothyroidism
see lymphocytic thyroiditis.
congenital hypothyroidism
results from congenital thyroid dysgenesis, defective hormone synthesis or severe iodine deficiency. There is dwarfism, macroglossia and mental dullness.
iatrogenic hypothyroidism
may follow treatment for hyperparathyroidism in cats.
juvenile hypothyroidism
congenital hypothyroidism (above).
primary hypothyroidism
that resulting from disease of the thyroid glands.
secondary hypothyroidism
caused by a deficiency of thyroid-stimulating hormone, usually as a result of a lesion in the pituitary gland.
tertiary hypothyroidism
caused by a lack of synthesis or release of thyrotropin releasing hormone.
References in periodicals archive ?
That means some dogs with NTI may receive thyroxine supplementation when they don't need it, while some dogs with primary hypothyroidism may go untreated, explains Jan A.
We did not have the facility of TSH receptor antibodies level to support the underlying Grave's autoimmune phenomenon and our patient was diagnosed as primary hypothyroidism in first place.
These findings are in accordance with Panciera (1994) who narrated that secondary skin disorders such as malassezia infection, bacterial pyoderma, seborrhoea, otitis externa are commonly associated skin disorders with primary hypothyroidism in dogs.
Pituitary hyperplasia resulting from primary hypothyroidism mimicking macroadenomas.
In hospitalised patients, an elevated TSH is as likely to be due to recovery from NTI as primary hypothyroidism, and a TSH <0.
Primary hypothyroidism occurs when the thyroid gland does not produce a sufficient amount of thyroid hormone (TH) to maintain body metabolism and heat production.
Serial serum TSH measurements are adequate to follow adults with newly diagnosed, uncomplicated primary hypothyroidism.
1) Primary hypothyroidism is the most common thyroid sequela following radiotherapy.
Primary hypothyroidism is confirmed by an elevated TSH and decreased free T4 level.
Approximately 240 women reported having symptomatic primary hypothyroidism and thyroid supplementation before they were diagnosed with breast cancer or before their screening visit.
The causes of primary hypothyroidism in the elderly include thyroid autoimmune disease, neck irradiation, and previous surgical or medical treatment of hyperthyroidism as well as drugs such as lithium or amiodarone.
3] in treating primary hypothyroidism and the euthyroid sick syndrome, none of these applications is supported by reasonable clinical data--and in the case of euthyroid sick syndrome, there is a distinct potential for harm, according to the panelists.

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