Graves' disease
Graves' disease | |
---|---|
Other names | Toxic diffuse goiter, Flajani–Basedow–Graves disease |
Radioiodine therapy, medications, thyroid surgery[1] | |
Frequency | 0.5% (males), 3% (females)[5] |
Graves' disease, also known as toxic diffuse goiter, is an autoimmune disease that affects the thyroid.[1] It frequently results in and is the most common cause of hyperthyroidism.[5] It also often results in an enlarged thyroid.[1] Signs and symptoms of hyperthyroidism may include irritability, muscle weakness, sleeping problems, a fast heartbeat, poor tolerance of heat, diarrhea and unintentional weight loss.[1] Other symptoms may include thickening of the skin on the shins, known as pretibial myxedema, and eye bulging, a condition caused by Graves' ophthalmopathy.[1] About 25 to 30% of people with the condition develop eye problems.[1][4]
The exact cause of the disease is unclear, but symptoms are a result of antibodies binding to receptors on the thyroid causing over-expression of thyroid hormone.
The three treatment options are
Graves' disease develops in about 0.5% of males and 3.0% of females.[5] It occurs about 7.5 times more often in women than in men.[1] Often, it starts between the ages of 40 and 60, but can begin at any age.[6] It is the most common cause of hyperthyroidism in the United States (about 50 to 80% of cases).[1][4] The condition is named after Irish surgeon Robert Graves, who described it in 1835.[6] A number of prior descriptions also exist.[6]
Signs and symptoms
The signs and symptoms of Graves' disease virtually all result from the direct and indirect effects of hyperthyroidism, with main exceptions being
Cause
The exact cause is unclear, but it is believed to involve a combination of genetic and environmental factors.[3] While a theoretical mechanism occurs by which exposure to severe stressors and high levels of subsequent distress such as post-traumatic stress disorder could increase the risk of immune disease and cause an aggravation of the autoimmune response that leads to Graves' disease, more robust clinical data are needed for a firm conclusion.[10]
Genetics
A
Genes believed to be involved include those for
Infectious trigger
Since Graves' disease is an autoimmune disease that appears suddenly, often later in life, a
The bacterium Yersinia enterocolitica bears structural similarity with the human thyrotropin receptor[11] and was hypothesized to contribute to the development of thyroid autoimmunity arising for other reasons in genetically susceptible individuals.[14] In the 1990s, Y. enterocolitica was suggested to be possibly
Epstein–Barr virus is another potential trigger.[17]
Mechanism
Thyroid-stimulating immunoglobulins recognize and bind to the TSH receptor, which stimulates the secretion of thyroxine (T4) and triiodothyronine (T3). Thyroxine receptors in the pituitary gland are activated by the surplus hormone, suppressing additional release of TSH in a negative feedback loop. The result is very high levels of circulating thyroid hormones and a low TSH level.[citation needed]
Pathophysiology
Graves' disease is an
These antibodies cause hyperthyroidism because they bind to the TSHr and
The infiltrative exophthalmos frequently encountered has been explained by postulating that the thyroid gland and the extraocular muscles share a common antigen, which is recognized by the antibodies. Antibodies binding to the extraocular muscles would cause swelling behind the eyeball.
The "orange peel" skin has been explained by the infiltration of antibodies under the skin, causing an inflammatory reaction and subsequent fibrous plaques.
The three types of autoantibodies to the TSH receptor are:
- Thyroid stimulating immunoglobulins: these antibodies (mainly IgG) act as long-acting thyroid stimulants, activating the cells through a slower and more drawn out process compared to TSH, leading to an elevated production of thyroid hormone.
- Thyroid growth immunoglobulins: these antibodies bind directly to the TSH receptor and have been implicated in the growth of thyroid follicles.
- Thyrotrophin binding-inhibiting immunoglobulins: these antibodies inhibit the normal union of TSH with its receptor.
- Some actually act as if TSH itself is binding to its receptor, thus inducing thyroid function.
- Other types may not stimulate the thyroid gland, but prevent TSI and TSH from binding to and stimulating the receptor.
Another effect of hyperthyroidism is bone loss from osteoporosis, caused by an increased excretion of calcium and phosphorus in the urine and stool. The effects can be minimized if the hyperthyroidism is treated early.
Diagnosis
Graves' disease may present clinically with one or more of these characteristic signs:[citation needed]
- Rapid heartbeat (80%)
- Diffuse palpable goiter with audible bruit (70%)
- Tremor (40%)
- Exophthalmos (protuberance of one or both eyes), periorbital edema (25%)
- Fatigue (70%), weight loss (60%) with increased appetite in young people and poor appetite in the elderly, and other symptoms of hyperthyroidism/thyrotoxicosis
- Heat intolerance (55%)
- Tremulousness (55%)
- Palpitations (50%)
Two signs are truly diagnostic of Graves' disease (i.e., not seen in other hyperthyroid conditions): exophthalmos and nonpitting edema (
Other useful laboratory measurements in Graves' disease include thyroid-stimulating hormone (TSH, usually undetectable in Graves' disease due to negative feedback from the elevated T3 and T4), and protein-bound iodine (elevated). Serologically detected thyroid-stimulating antibodies, radioactive iodine uptake, or thyroid ultrasound with Doppler all can independently confirm a diagnosis of Graves' disease.
Biopsy to obtain histiological testing is not normally required, but may be obtained if thyroidectomy is performed.
The goiter in Graves' disease is often not nodular, but
Eye disease
Thyroid-associated ophthalmopathy (TAO), or thyroid eye disease (TED), is the most common extrathyroidal manifestation of Graves' disease. It is a form of idiopathic lymphocytic orbital inflammation, and although its pathogenesis is not completely understood, autoimmune activation of orbital fibroblasts, which in TAO express the TSH receptor, is thought to play a central role.[21]
Hypertrophy of the extraocular muscles, adipogenesis, and deposition of nonsulfated glycosaminoglycans and hyaluronate, causes expansion of the orbital fat and muscle compartments, which within the confines of the bony orbit may lead to dysthyroid optic neuropathy, increased intraocular pressures, proptosis, venous congestion leading to chemosis and periorbital edema, and progressive remodeling of the orbital walls.[22][23][24] Other distinctive features of TAO include lid retraction, restrictive myopathy, superior limbic keratoconjunctivitis, and exposure keratopathy.[citation needed]
Severity of eye disease may be classified by the mnemonic: "NO SPECS":[25]
- Class 0: No signs or symptoms
- Class 1: Only signs (limited to upper lid retraction and stare, with or without lid lag)
- Class 2: Soft tissue involvement (oedema of conjunctivaeand lids, conjunctival injection, etc.)
- Class 3: Proptosis
- Class 4: Extraocular muscle involvement (usually with diplopia)
- Class 5: Corneal involvement (primarily due to lagophthalmos)
- Class 6: Sight loss (due to optic nerve involvement)
Typically, the natural history of TAO follows Rundle's curve, which describes a rapid worsening during an initial phase, up to a peak of maximum severity, and then improvement to a static plateau without, however, resolving back to a normal condition.[26]
Management
Treatment of Graves' disease includes
Treatment with antithyroid medications must be administered for six months to two years to be effective. Even then, upon cessation of the drugs, the hyperthyroid state may recur. The risk of recurrence is about 40–50%, and lifelong treatment with antithyroid drugs carries some side effects such as agranulocytosis and liver disease.[27] Side effects of the antithyroid medications include a potentially fatal reduction in the level of white blood cells. Therapy with radioiodine is the most common treatment in the United States, while antithyroid drugs and/or thyroidectomy are used more often in Europe, Japan, and most of the rest of the world.
β-Blockers (such as propranolol) may be used to inhibit the sympathetic nervous system symptoms of tachycardia and nausea until antithyroid treatments start to take effect. Pure β-blockers do not inhibit lid retraction in the eyes, which is mediated by alpha adrenergic receptors.
Antithyroid drugs
The main antithyroid drugs are
A
No difference in outcome was shown for adding thyroxine to antithyroid medication and continuing thyroxine versus placebo after antithyroid medication withdrawal. However, two markers were found that can help predict the risk of recurrence. These two markers are a positive TSHr antibody (TSHR-Ab) and smoking. A positive TSHR-Ab at the end of antithyroid drug treatment increases the risk of recurrence to 90% (sensitivity 39%, specificity 98%), and a negative TSHR-Ab at the end of antithyroid drug treatment is associated with a 78% chance of remaining in remission. Smoking was shown to have an impact independent to a positive TSHR-Ab.[29]
Radioiodine
Radioiodine (radioactive iodine-131) was developed in the early 1940s at the
Contraindications to RAI are pregnancy (absolute), ophthalmopathy (relative; it can aggravate thyroid eye disease), or solitary nodules.[32]
Disadvantages of this treatment are a high incidence of hypothyroidism (up to 80%) requiring eventual thyroid hormone supplementation in the form of a daily pill(s). The radioiodine treatment acts slowly (over months to years) to destroy the thyroid gland, and Graves' disease–associated hyperthyroidism is not cured in all persons by radioiodine, but has a relapse rate that depends on the dose of radioiodine which is administered.[32] In rare cases, radiation induced thyroiditis has been linked to this treatment.[33]
Surgery
This modality is suitable for young and pregnant people. Indications for thyroidectomy can be separated into absolute indications or relative indications. These indications aid in deciding which people would benefit most from surgery.
Both bilateral subtotal thyroidectomy and the Hartley-Dunhill procedure (hemithyroidectomy on one side and partial lobectomy on other side) are possible.
Advantages are immediate cure and potential removal of
A 2013 review article concludes that surgery appears to be the most successful in the management of Graves' disease, with total thyroidectomy being the preferred surgical option.[34]
Eyes
Mild cases are treated with lubricant eye drops or nonsteroidal anti-inflammatory drops. Severe cases threatening vision (corneal exposure or optic nerve compression) are treated with steroids or orbital decompression. In all cases, cessation of smoking is essential. Double vision can be corrected with prism glasses and surgery (the latter only when the process has been stable for a while).
Difficulty closing eyes can be treated with lubricant gel at night, or with tape on the eyes to enable full, deep sleep.
Orbital decompression can be performed to enable bulging eyes to retreat back into the head. Bone is removed from the skull behind the eyes, and space is made for the muscles and fatty tissue to fall back into the skull. [35]
For management of clinically active Graves' disease, orbitopathy (clinical activity score >2) with at least mild to moderate severity, intravenous glucocorticoids are the treatment of choice, usually administered in the form of pulse intravenous methylprednisolone. Studies have consistently shown that pulse intravenous methylprednisolone is superior to oral glucocorticoids both in terms of efficacy and decreased side effects for managing Graves' orbitopathy.[36]
Prognosis
If left untreated, more serious
Epidemiology
Graves' disease occurs in about 0.5% of people.[4] Graves' disease data has shown that the lifetime risk for women is around 3% and 0.5% for men.[39] It occurs about 7.5 times more often in women than in men[1] and often starts between the ages of 40 and 60.[6] It is the most common cause of hyperthyroidism in the United States (about 50 to 80% of cases).[1][4]
History
Graves' disease owes its name to the Irish doctor
The German Karl Adolph von Basedow independently reported the same constellation of symptoms in 1840.[42][43] As a result, on the European continent, the terms "Basedow syndrome",[44] "Basedow disease", or "Morbus Basedow"[45] are more common than "Graves' disease".[44][46]
Graves' disease[44][45] has also been called exophthalmic goiter.[45]
Less commonly, it has been known as Parry disease,
However, fair credit for the first description of Graves' disease goes to the 12th-century
Society and culture
Notable cases
- Ayaka, Japanese singer, was diagnosed with Graves' disease in 2007. After going public with her diagnosis in 2009, she took a two-year hiatus from music to focus on treatment.[55][56]
- Susan Elizabeth Blow, American educator and founder of the first publicly funded kindergarten in the United States, was forced to retire and seek treatment for Graves' disease in 1884.[57]
- George H. W. Bush, former U.S. president, developed new atrial fibrillation and was diagnosed in 1991 with hyperthyroidism due to the disease and treated with radioactive iodine.[58] The president's wife, Barbara Bush, also developed the disease around the same time, which, in her case, produced severe infiltrative exophthalmos.[59]
- Rodney Dangerfield, American comedian and actor[60]
- Gail Devers, American sprinter: A doctor considered amputating her feet after she developed blistering and swelling following radiation treatment for Graves' disease, but she went on to recover and win Olympic medals.
- Missy Elliott, American hip-hop artist[61]
- Marty Feldman, British comedy writer, comedian and actor[62][63]
- Sia, Australian singer and songwriter[64]
- Sammy Gravano, Italian-American former underboss of the Gambino crime family[65]
- Jim Hamilton, Scottish rugby player, discovered he had Graves' disease shortly after retiring from the sport in 2017.[66]
- Heino, German folk singer, whose dark sunglasses (worn to hide his symptoms) became part of his trademark look[67]
- Herbert Howells, British composer; the first person to be treated with radium injections[68]
- Yayoi Kusama, Japanese artist[69]
- Nadezhda Krupskaya, Russian Communist and wife of Vladimir Lenin[70]
- Umm Kulthum was an Egyptian singer, songwriter, and film actress active from the 1920s to the 1970s.
- Barbara Leigh, an American former actress and fashion model, now spokeswoman for the National Graves' Disease Foundation[71]
- Keiko Masuda, Japanese singer and one-half of the duo Pink Lady.[72][73][74][75]
- Yūko Miyamura, Japanese voice actress[76]
- Lord Monckton, former UKIP and Conservative politician[77]
- Sophia Parnok, Russian poet[78][79][80]
- Sir Cecil Spring Rice, British ambassador to the United States during World War I, died suddenly of the disease in 1918.[81]
- Christina Rossetti, English Victorian-era poet[82]
- Dame Maggie Smith, British actress[83]
- Mary Webb, British novelist and poet[84]
- Wendy Williams, American TV show host[85]
- Act Yasukawa, Japanese professional wrestler[86]
Literature
- In Italo Svevo's novel Zeno's Conscience, character Ada develops the disease.[87][88]
- literary hoax.
Research
Agents that act as antagonists at thyroid stimulating hormone receptors are under investigation as a possible treatment for Graves' disease.[89]
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External links
- "Graves' disease". Genetics Home Reference. U.S. National Library of Medicine.
- https://www.ncbi.nlm.nih.gov/gene/?term=graves about graves on ncbi