History of Tourette syndrome

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Georges Gilles de la Tourette (1857–1904), namesake of Tourette syndrome

Tourette syndrome is an inherited neurological disorder with onset in childhood, characterized by the presence of multiple physical (motor) tics and at least one vocal (phonic) tic.[1]

The eponym was bestowed by Jean-Martin Charcot (1825–93) on behalf of his resident, Georges Albert Édouard Brutus Gilles de la Tourette (1859–1904), a French physician and neurologist, who published an account of nine patients with Tourette's in 1885. The possibility that movement disorders, including Tourette syndrome, might have an organic origin was raised when an encephalitis epidemic from 1918–1926 led to a subsequent epidemic of tic disorders. Research in 1972 advanced the argument that Tourette's is a neurological, rather than psychological, disorder; since the 1990s, a more neutral view of Tourette's has emerged, in which biological vulnerability and adverse environmental events are seen to interact.

Findings since 1999 have advanced TS science in the areas of genetics, neuroimaging, neurophysiology, and neuropathology. Questions remain regarding how best to classify Tourette syndrome, and how closely Tourette's is related to other movement disorders or psychiatric disorders. Good epidemiologic data is still lacking, and available treatments are not risk free and not always well tolerated.

Fifteenth century[edit]

The first presentation of Tourette syndrome is thought to be from the late 15th century in the book, Malleus Maleficarum ("Witch's hammer") by Jacob Sprenger and Heinrich Kraemer, describing a priest whose tics were "believed to be related to possession by the devil".[2][3]

Nineteenth century[edit]

Jean-Martin Charcot (1825–1893) was a French neurologist and professor who bestowed the eponym for Tourette syndrome on behalf of his resident, Georges Albert Édouard Brutus Gilles de la Tourette. Charcot is shown here demonstrating hypnosis.[4]

A French doctor, Jean Marc Gaspard Itard, reported the first case of Tourette syndrome in 1825,[5] describing Marquise de Dampierre, an important woman of nobility in her time, whose episodes later understood to be coprolalia "were obviously in stark contrast to the lady's background, intellect, and refined manners".[6]

Jean-Martin Charcot, an influential French physician, assigned his resident Georges Albert Édouard Brutus Gilles de la Tourette, a French physician and neurologist, to study patients at the Salpêtrière Hospital, with the goal of defining an illness distinct from hysteria and from chorea. Charcot and Gilles de la Tourette believed that the "tic illness" they had observed was an untreatable, chronic, and progressive hereditary condition.[7] History is unclear on whether Charcot had examined the Marquise de Dampierre, but his publications mention having met her socially and overhearing her most common utterances of "merde and foutu cochon (which translates literally as filthy pig but the truer colloquial meaning is 'fucking pig')".[6]

In 1885, Gilles de la Tourette published an account of nine patients, Study of a Nervous Affliction, concluding that a new clinical category should be defined.[8] His description included accounts of Marquise de Dampierre, previously described by Itard, as a reclusive aristocratic lady who "ticked and blasphemed" from the age of seven until her death at the age of 80 years. Gilles de la Tourette describes the common feature of involuntary movements or tics in all nine patients. The eponym was later bestowed by Charcot after and on behalf of Gilles de la Tourette.[7][9]

Little progress was made over the next century in explaining or treating tics. With limited clinical experience, involving typically one or two patients, authors advanced different ideas, including brain lesions similar to those resulting from rheumatic chorea or encephalitis lethargica as a cause of tics, faulty mechanisms of normal habit formation, and treatment with Freudian psychoanalysis. The psychogenic view prevailed well into the 20th century.[7]

Twentieth century[edit]

The possibility that movement disorders, including Tourette syndrome, might have an organic origin was raised when an encephalitis epidemic from 1918–1926 led to a subsequent epidemic of tic disorders. The psychoanalytic theory was so dominant that it was claimed that an organic component alone would not be sufficient to produce Tourette syndrome. At the time, psychiatrists believed patients with tics must also be suffering from unresolved psychological disturbances or psychosexual conflicts, and psychiatric intervention was the preferred method of treatment. Patients and their families were told that their own psychological maladjustments were to blame for their symptoms, adding to the burden carried by the patients and their families. Until the early 1970s, psychoanalysis was the preferred intervention for Tourette syndrome.[10]

During the 1960s and 1970s, as the beneficial effects of haloperidol (Haldol) on tics became known, the psychoanalytic approach to Tourette syndrome was questioned. The first description of haloperidol in the treatment of Tourette's was published by Seignot in 1961.[11] The turning point came in 1965, when Arthur K. Shapiro—described as "the father of modern tic disorder research"[12]—treated a Tourette’s patient with haloperidol. Dr. Shapiro and his wife, Elaine Shapiro (PhD), reported the treatment in a 1968 article, and severely criticized the psychoanalytic approach.[10]

The Shapiros, working with the patient families who founded in 1972 the Tourette Syndrome Association (TSA, renamed to Tourette Association of America (TAA_ in 2015), advanced the argument that Tourette's is a neurological, rather than psychological, disorder,[10] and worked to persuade the media to promote information about Tourette's.[13] Although the original case reports of TS were by French neurologists, the "focus moved to New York in the 1970s"[14] and "the centre for the most committed progress in TS continued to be the USA, facilitated by the success of the Tourette Syndrome Association".[14]

The U.S. National Institutes of Health (NIH) turned down a 1972 grant proposal from the TAA (then known as the TSA) because "the reviewers believed there were probably no more than 100 cases of TS in the entire nation",[13] and a 1973 registry reported only 485 cases worldwide.[15] Subsequent articles on Tourette's in Good Housekeeping, The New York Times and Ann Landers produced an "enormous response, proving that there were many undiagnosed cases of TS across the United States".[13] TS was listed as a rare disorder in the United States Orphan Drug Act of 1983, a law enacted to increase development of medications for conditions which affect small numbers of people.[16] In 1985 pimozide was approved by the U.S. Food and Drug Administration for the treatment of the condition.[17]

Multiple studies published since 2000 have consistently demonstrated that the prevalence of TS and tic disorders is much higher than previously thought.[18] The emerging consensus is that 1–10 children per 1,000 have Tourette's,[19] with several studies supporting a tighter range of 6–8 children per 1,000.[20] Using year 2000 census data, a prevalence range of 1–10 per 1,000 yields an estimate of 53,000–530,000 school-age children with Tourette's in the US[20] and a prevalence range of 6–10 per 1,000 means that 64,000–106,000 children aged 5–18 years may have Tourette's in the UK.[21] Most of these children are undiagnosed and have mild symptoms without distress or impairment.[22][23] Since the 1990s, a more neutral view of Tourette's has emerged, in which biological vulnerability and adverse environmental events are seen to interact.[7][24]

Evolution of diagnostic criteria[edit]

TS was first included in the third revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-III) in 1980.[25] In 2000, the American Psychiatric Association published the DSM-IV-TR, revising the text of DSM-IV to no longer require that symptoms of tic disorders cause distress or impair functioning.[26] The fifth revision of the DSM (DSM-5) was published in 2013: it defined tic disorders in the motor disorders chapter of the neurodevelopmental disorders, and removed the word "stereotyped" from the description of tics; replaced transient tic disorder with provisional tic disorder; differentiated motor and vocal chronic tic disorder; removed the use of stimulants as a cause of tics; and e) added two new categories of tic disorders. Few significant other changes were made.[1][27][28][29]


Tourette Association of America[edit]

In 2015, the Tourette Syndrome Association changed its name to the Tourette Association of America.[30] As of 2020, the Tourette Association of America had contacts in 50 countries.[31] The Tourette syndrome International database Consortium (TIC) brought together data on clinical samples of patients with Tourette syndrome from twenty-two countries (Argentina, Australia, Austria, Belgium, Brazil, Canada, Denmark, Germany, Hungary, Iceland, Israel, Italy, Japan, The Netherlands, Norway, People's Republic of China, Poland, South Africa, Sweden, Turkey, the US and the UK);[32] Tourette's has also been studied in Chile, Colombia, Costa Rica, India, Indonesia, Korea, and Spain.[33]

European Society for the Study of Tourette syndrome[edit]

The European Society for the Study of Tourette syndrome (ESSTS) held its first meeting in 2000, with the goal of increasing awareness about Tourette syndrome in Europe. In 2009, working groups started to formulate the first European guidelines for TS, which were published in 2011.[14]

Research directions and controversies[edit]

Findings reported in published studies of Tourette syndrome since 1999 have advanced TS science in the areas of genetics, neuroimaging, neurophysiology, and neuropathology. The TAA supports a clinical database that may help identify genes involved in Tourette syndrome, and the TSA International Genetic Consortium has collected a database on large extended families for future studies. Novel neuroimaging studies are being employed to study tic expression and functional or cognitive deficits in TS patients. Studies of Tourette's neurophysiology and neuropathology are attempting to link deficits in Tourette's to specific brain mechanisms, and have taken advantage of a brain bank sponsored by the TSA. Clinical trials have focused on understanding tic suppression, comorbid conditions, novel treatment approaches such as botulinum toxin, and targeted behavioral therapies. Controversy remains in the areas of deep brain stimulation and PANDAS.[34]

Questions remain regarding how best to classify Tourette syndrome, and how closely Tourette's is related to other movement disorders or psychiatric disorders. Good epidemiologic data is still lacking, and available treatments are not risk free and not always well tolerated.[34]

The direction of current and future research in Tourette's was outlined in a 2005 journal article[35] by the outgoing chairman of the TSA Scientific Advisory Board. Swerdlow divides the research landscape into five broad questions about Tourette's: what is it, who has it, what causes it, how it should be studied, and how it should be (medically) treated.

According to Swerdlow,[35] "the 'core' TS conundrum" is a lack of consensus about the definition of Tourette syndrome. Since vocal tics result from a "motor event (ie, a contracting diaphragm moving air through the upper airways)", TS could be defined as a disorder of motor tics, eliminating the distinction between TS and the other tic disorders. Individuals who have only tics may not be functionally impaired, raising the question of whether Tourette's as currently defined should be a DSM diagnosis. Swerdlow highlights the importance of studies in new areas such as behavioral techniques, and says that "the whole-cloth dismissal of psychologic forces in the pathobiology of TS was a strategic error". Questions remain about whether co-occurring (comorbid) conditions should be part of the core definition, and why sensory phenomena, which are a core part of Tourette's, are not part of the diagnostic criteria.

Dropping the criteria for impairment from the diagnosis resulted in higher estimates of the prevalence of TS (the question of "who has it?"). Older estimates "came from tertiary referral samples, the sickest of the sick"; greater prevalence casts the condition in an entirely new light, and calls for new biological models of the condition and new approaches to addressing a more common disorder.[35] Discovering the causes of Tourette's may help resolve the questions of what it is and who has it. The autosomal dominant inheritance model has not been validated, and past research has been affected by the problem of referred samples, which may not reflect broader populations of persons with Tourette's. Probabilistic genetic models may yield better clues than the "one gene equals one disorder" approach. One of the most controversial presumed causes, the PANDAS hypothesis, has sparked disagreement.[35]

Expanding criteria for the diagnosis, and increasing awareness of the impact of comorbid diagnoses, has resulted in further questions of how to study Tourette's. Tourette's patients are often recruited from sources that introduce ascertainment bias towards one 'type' of TS. Developing and applying standardized instruments, along with a greater awareness of ascertainment bias in recruitment sources, will be important in genetic studies. We do not know if "we lose both signals and are just adding noise to the experimental outcome"[35] when comorbid conditions, such as OCD or ADHD, are included or excluded from study samples, or samples include/exclude children or adults, or patients with severe symptoms.

Tourette's is a heterogeneous condition, with waxing and waning symptoms. The inherently changing nature of its core symptoms complicates research design, resulting in questions about medications in clinical practice. Results from case studies may not be borne out by controlled or prospective, longitudinal studies, stimulants may be underused, and behavioral therapies are understudied. High-profile media coverage focuses on treatments that do not have established safety or efficacy e.g., deep brain stimulation, and alternative therapies involving unstudied efficacy and side effects are pursued by many parents.[35]

In the USA, the NIH has ongoing clinical trials,[36] and the TSA funds ongoing research through its Research Program and Research Grant Awards.[37] Other worldwide ongoing trials can be found by contacting Tourette syndrome advocacy groups.[38]

In Europe, the ESSTS published the first European clinical guidelines for Tourette syndrome and tic disorders in 2011.[39] As of 2011, the only other guidelines in Europe were for Germany.[39] In an editorial that accompanied the release of the guidelines, its authors said that in spite of a "high level of clinical experience, particularly in specialized centers", relative to other childhood-onset disorders, TS had been neglected in the research, possibly because TS had historically been viewed as a rare disorder, and due to the "high rate of relatively mild cases and an often favorable course with good chance of spontaneous remission".[39] They also indicated a fragmentation in clinical approach to TS, as its core symptoms can be viewed as part of a neurology specialty (movement disorder) or child and adolescent psychiatry.[39] They hoped the guidelines would "help clinicians to offer the best clinical service ... and inspire clinical researchers as well as politicians to no longer overlook the high burden of tic disorders".[39]

Modeled after genetic breakthroughs seen with large-scale efforts in other neurodevelopmental disorders, three groups (the Tourette Syndrome Association International Consortium for Genetics, Tourette International Collaborative Genetics, and the European Multicentre Tics in Children Study) are collaborating in research of the genetics of Tourette's. Compared to the successful efforts seen in other conditions (autism, schizophrenia and bipolar disorder), these efforts are underfunded in the US.[40][41]


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