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|Classification and external resources|
|Classification and external resources|
Sydenham's chorea or chorea minor (historically referred to as Saint Vitus Dance) is a disorder characterized by rapid, uncoordinated jerking movements primarily affecting the face, hands and feet. Sydenham's chorea (SC) results from childhood infection with Group A beta-hemolytic Streptococcus and is reported to occur in 20-30% of patients with acute rheumatic fever (ARF). The disease is usually latent, occurring up to 6 months after the acute infection, but may occasionally be the presenting symptom of rheumatic fever. Sydenham's chorea is more common in females than males and most patients are children, below 18 years of age. Adult onset of Sydenham's chorea is comparatively rare and the majority of the adult cases are associated with exacerbation of chorea following childhood Sydenham's chorea.
Sydenham's chorea is characterised by the abrupt onset (sometimes within a few hours) of neurologic symptoms, classically chorea, usually affecting all four limbs. Other neurologic symptoms include behavior change, dysarthria, gait disturbance, loss of fine and gross motor control with resultant deterioration of handwriting, headache, slowed cognition, facial grimacing, fidgetiness and hypotonia. Also, there may be tongue fasciculations ("bag of worms") and a "milk sign", which is a relapsing grip demonstrated by alternate increases and decreases in tension, as if hand milking.
The PANDAS (pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections) syndrome is similar, but is not characterized by Sydenham's motor dysfunction. PANDAS presents with tics and/or a psychological component (e.g., OCD) and occurs much earlier, days to weeks after GABHS infection rather than 6–9 months later. It may be confused with other conditions such as lupus and Tourette syndrome.
Movements cease during sleep, and the disease usually resolves after several months. Unlike in Huntington disease, which is generally of adult onset and associated with an unremitting autosomal dominant movement disorder and dementia, neuroimaging in Sydenham's chorea is normal and other family members are unaffected. Other disorders that may be accompanied by chorea include abetalipoproteinemia, ataxia-telangiectasia, Fahr disease, glutaric aciduria, Wilson disease, Lesch-Nyhan syndrome, hyperthyroidism, lupus erythematosus, pregnancy (chorea gravidarum), and certain anticonvulsants or psychotropic agents.
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Sydenham’s chorea became a well defined nosological entity only during the second half of the nineteenth century. Such progress was promoted by the availability of large clinical series provided by newly founded paediatric hospitals. A 2005 study examined the demographic and clinical features of patients with chorea admitted to the first British paediatric hospital (the Hospital for Sick Children, Great Ormond Street, London) (GOS) between 1852 and 1936. The seasonal and demographic characteristics of Sydenham’s chorea during this time appear strikingly similar to those observed today, and witness the introduction of modern “statistically averaging” techniques in the approach to complex paediatric syndromes. Great Ormond Street hospital case notes provide detailed descriptions of the “typical cases” of SC, and show that British physicians working in the early age of paediatric hospitals recognized the most distinctive clinical features of this condition.
Throughout the nineteenth century the term “chorea” referred to an ill-defined spectrum of hyperkinesias, including those recognised today as chorea, tics, dystonia, or myoclonus. William Osler started his monography on chorea1 stating that “in the whole range of medical terminology there is no such olla podrida as Chorea, which for a century has served as a sort of nosological pot into which authors have cast indiscriminately affections characterised by irregular, purposeless movements”.
Sydenham’s chorea (SC), a frequent cause of paediatric acute chorea, is a major manifestation of rheumatic fever (RF) The association of chorea with rheumatism was first reported in 1802, and confirmed in the following decades by several French and English authors. The inclusion of chorea under the rheumatic umbrella helped discriminate SC from other “choreic” syndromes.The incidence of Acute Rheumatic Fever and rheumatic heart disease (RHD) is not declining. Recent figures quote the incidence of Acute Rheumatic Fever as 0.6 - 0.7/1 000 population in the USA and Japan compared with 15 - 21/1 000 population in Asia and Africa. The prevalence of Acute Rheumatic Fever and Sydenham's Chorea has declined progressively in developed countries over the last decades. Physicians working in early children’s hospitals recognised new clinical syndromes through the definition of “typical clinical cases”. Complex multi-systemic diseases, such as RF, were categorised only after the observation of large, hospital based series. Therefore, paediatric hospitals gradually became an important setting for the application of a modern “statistical averaging” technique to paediatric syndromes. Historical authorities in paediatrics, such as Walter Butler Cheadle and Octavius Sturges, worked at the Hospital for Sick Children, Great Ormond Street, London (the first British paediatric hospital), and their clinical notes help to understand how the typical case of SC was defined.
Between 1860 and 1900 the proportion of choreic patients ranged between 5% and 7% of the total number of patients admitted (mean per year, 1003), whereas from 1900 to 1936 it was constantly below 4% (mean per year). Chorea was the fourth most frequent cause of admission between 1860 and 1900, and in the 1880s temporarily became the second most frequent diagnosis among inpatients. Contemporary articles report a homogeneous distribution of paediatric chorea all over England However, since many choreic children were “cured” at home, the hospital based rates probably underestimate the incidence of chorea in the general paediatric population.
A higher number of cases were admitted during the colder months, consistent with the reference epidemiological report on chorea at the end of the century. In the 1950s and 1960s the highest frequency of chorea was recorded during the winter months in several Northern and Central European countries. Interestingly, the incidence of rheumatism among GOS inpatients peaked in October, preceding chorea by approximately two months. This is consistent with the current knowledge that most of the RF symptoms appear about 10 days after the streptococcal infection, whereas SC occurs typically 2–3 months after infection.
More than 80% of choreic patients were aged between 7 and 11 years (mean 9.2). Due to a referral bias, this age may be falsely low. Indeed, the British Medical Association (1887) reported the peak age between 11 and 15 years. In the present series, the female:male ratio was 2.7, in accordance with the general choreic population of Britain towards the end of the 1800s. Interestingly, in children below age 7, the female preponderance is less manifest. This was observed also by Charles West (founder physician of GOS), and subsequently by Osler, who stated that “the second hemi-decade contains the greatest number of cases in males, and the third the greatest number in females”. In the majority of the 20th century studies, female preponderance is evident only in children over 10 years of age. These observations suggest a role for oestrogen in SC expression. Supporting this view, oral contraceptives and pregnancy can cause relapses of disease.
Ten per cent(10%) of the 1548 patients whose records were researched for the British study, were subsequently admitted with a relapse of chorea. Given that relapse admissions had a negative impact on the hospital cure rate, this rate might underestimate the actual relapse incidence in the general population of patients.
Fifty percent of patients with acute Sydenham's Chorea spontaneously recover after 2 to 6 months whilst mild or moderate chorea or other motor symptoms can persist for up to and over 2 years in some cases (for example a patient in the UK who has suffered the illness since 1999). Sydenham's is also associated with psychiatric symptoms with obsessive compulsive disorder being the most frequent manifestation.
A major manifestation of acute rheumatic fever, Sydenham's chorea is a result of an autoimmune response that occurs following infection by group A β-hemolytic streptococci that destroys cells in the corpus striatum of the basal ganglia. Molecular mimicry to streptococcal antigens leading to an autoantibody production against the basal ganglia has long been thought to be the main mechanism by which chorea occurs in this condition. In 2012, antibodies in serum to the cell surface antigen - Dopamine 2 receptor were shown in up to a third of patients in a cohort of Sydenham's chorea. Whether these antibodies represent an epi-phenomenon or are they pathogenic, remains to be proven. There are many causes of childhood chorea, including cerebrovascular accidents, collagen vascular diseases, drug intoxication, hyperthyroidism, Wilson's disease, Huntington's disease, and infectious agents.
Treatment of Sydenham's Chorea is based on the following three principles:
It is named after British physician Thomas Sydenham (1624–1689). The alternate eponym, "Saint Vitus Dance", is in reference to Saint Vitus, a Christian saint who was persecuted by Roman emperors and died as a martyr in AD 303. Saint Vitus is considered to be the patron saint of dancers, with the eponym given as homage to the manic dancing that historically took place in front of his statue during the feast of Saint Vitus in Germanic and Latvian cultures.