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Myxedema (British English: myxoedema) is a term used synonymously with severe hypothyroidism.However, the term is also used to describe a dermatological change that can occur in hypothyroidism and (rare) paradoxical cases of hyperthyroidism.
Hypothyroidism (also called underactive thyroid, low thyroid or hypothyreosis) is a disorder of the endocrine system in which the thyroid gland does not produce enough thyroid hormones. [3] It can cause a number of symptoms, such as poor ability to tolerate cold , extreme fatigue, muscle aches , constipation , slow heart rate , depression , and ...
For older people (over 50 years old) and people with known or suspected ischemic heart disease, levothyroxine therapy should not be initiated at the full replacement dose. [24] Since thyroid hormone increases the heart's oxygen demand by increasing heart rate and contractility, starting at higher doses may cause an acute coronary syndrome or an ...
Likewise, 20% of autoimmune thyroid patients also have pituitary antibodies. [7] It follows that a subset of thyroid patients may have a disease related to autoimmune hypophysitis. Recent research has focused on a defect at the CTLA-4 gene which, coupled with other factors, may result in autoimmunity primarily focusing on certain endocrine ...
TPO also converts tyrosyl, MIT-yl, and DIT-yl residues into their free radical forms. These forms attack other MIT-yl and DIT-yl residues. When a DIT-yl radical attacks a DIT, T 4-yl (peptidic T 4) is formed. When a MIT-yl radical attacks a DIT, T 3-yl is formed. Other reactions are possible, but do not form physiologically active products. [40 ...
Antithyroid autoantibodies (or simply antithyroid antibodies) are autoantibodies targeted against one or more components on the thyroid.The most clinically relevant anti-thyroid autoantibodies are anti-thyroid peroxidase antibodies (anti-TPO antibodies, TPOAb), thyrotropin receptor antibodies (TRAb) and thyroglobulin antibodies (TgAb).
Over time, thyroid damage can cause thyroid hormone levels to be too low. This is called an underactive thyroid or hypothyroidism (heye-poh-THEYE-royd-ism). An underactive thyroid causes every function of the body to slow down, such as heart rate , brain function, and the rate your body turns food into energy .
Myxedema coma is an extreme or decompensated form of hypothyroidism and while uncommon, is potentially lethal. [1] [2] [3] A person may have laboratory values identical to a "normal" hypothyroid state, but a stressful event (such as an infection, myocardial infarction, or stroke) precipitates the myxedema coma state, usually in the elderly.