Tom Berney is a consultant in developmental psychiatry with the Northgate & Prudhoe NHS Trust (Prudhoe Hospital, Prudhoe, Northumberland NE42 5NT, UK. E-mail: t.p.berney{at}ncl.ac.uk) and at the Fleming Nuffield Child Psychiatry Unit, Newcastle upon Tyne. He is also honorary consultant to European Services for People with Autism, a registered charity that provides community services.
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| Box 1 Characteristics of Asperger syndrome in adulthood Childhood onset Limited social relationships social isolation
Problems in communication
Absorbing and narrow interests
(After Gillberg et al, 2001)
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Seeking to describe the nub of this syndrome, Asperger coined the term autistic psychopathy in 1944 to distinguish its innate social distance from that which develops later in schizophrenia; the concept was elaborated by van Kraevelen in 1963, Lorna Wing in 1981 and, most recently, Christopher Gillberg (Gillberg, 1998). There have been different interpretations of the syndrome and it has become included in the group of autistic-spectrum disorders.
This review focuses primarily on clinical issues: more academic aspects have been reviewed by Volkmar et al(2004).
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Gillberg and colleagues proposed a set of disgnostic criteria that approximate to Aspergers original clinical descriptions (Leekam et al, 2000). Various symptoms have been suggested as distinguishing Asperger syndrome from high-functioning autism (i.e. autism without generalised learning disability) and the issue is clouded by the variety of definitions in use. When allowance is made for ability, there appears to be little real difference between the two except in terms of severity (Kugler, 1998; Gilchrist et al, 2001; Howlin, 2003) although self-awareness remains to be explored (Tantam, 2003).
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This desire to place all socially impaired patients somewhere on the autistic spectrum is offset by efforts to split off syndromes such as pathological demand avoidance (Newson et al, 2003) and semantic pragmatic (Bishop & Norbury, 2002) or multiplex developmental disorders (Towbin et al, 1993). Complicated by synonyms such as right-hemisphere or non-verbal learning disorders (Fitzgerald, 1999), the result is a confusing grouping of specific disabilities on which we impose recognisable constellations of clinical disorder (Willemsen-Swinkels & Buitelaar, 2002).
Where should we set the boundaries of a dimensional disorder? As with the personality disorders, there needs to be a diagnostic threshold: it might be the point at which the behaviour causes distress (either to the patient or to those around) or significant problems in social functioning and performance, or at which it requires treatment. But can we fix a threshold in this way? The label of Asperger syndrome may help the bullied schoolboy but be rejected when he becomes a mathematical star enjoying university: a functional distinction of permanent traits from a disorder that depends on the setting as much as the innate characteristics. That the presence of an autistic-spectrum disorder may make it difficult for the individual to acknowledge his disability complicates this concept.
Autism used to be considered a rare disorder with a population prevalence of about 0.04%, of whom 7080% had a significant learning disability. More recently, the extended spectrum of autistic disorder gives a population prevalence of at least 0.6%, of whom 7090% are of normal learning ability. So far, the evidence is that this shift can be explained by changing concepts and diagnostic boundaries as well as by the wider recognition of autistic-spectrum disorders rather than by any real substantial increase (Fombonne, 2003).
As the developmental model embraces more of psychiatry, it appears increasingly difficult to make a sharp distinction between autisticspectrum disorder and other entities such as the personality disorders, simple schizophrenia and catatonia; at times the diagnostic label reflects the clinicians specialty rather than the syndrome.
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Besides an innate link with varied comorbidity, there is the stress of growing up with Asperger syndrome that arises from unrecognised disability, limited achievement and a sense of failure, often revealed by an increasing contrast with more autonomous and successful siblings or peers. In addition, the syndrome distorts relationships with family and peers, who can be infuriated by the persons self-centred insensitivity, obsessiveness and rigid inflexibility. All this can add secondary disability and result in a degree of dependency that is out of proportion to the persons intellectual ability (Howlin et al, 2004).
Over a third of people with autistic-spectrum disorders develop epilepsy, the risk being linked to the degree of developmental delay and receptive language deficit. There is no specific study of epilepsy in Asperger syndrome, although the relatively normal ability and language suggest that the risk is lower, possibly 510%, and that it is more likely to start later, in adolescence or early adulthood (Tuchman & Rapin, 2002).
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Communication
This is often obviously abnormal, conversation taking the form of one-sided, circumstantial lectures delivered impassively by a seemingly robotic figure with a mechanical voice. However, less obvious conversational abnormality includes unrecognised, underlying discrepancies between verbal and non-verbal language, and between comprehension and expression. These can lead both the affected individual and those around him to misjudge his abilities, expectations being either too high or too low. Very often, reading works where listening has brought incomprehension. Often, the life of someone with Asperger syndrome can be transformed if as much as possible is presented to him in writing.
Social relationships
These are one-sided, distant or even absent, rather than really reciprocal. Behind this is an unempathic objectivity that results in difficulties that range from understanding friendship (and how friends differ from acquaintances) through to making sexual relationships and grasping the rules that distinguish, for example, seduction from date rape. The person is not uninterested in relationships but, misunderstanding them, is too intense or too detached.
Interests
A key feature of Asperger syndrome is repetitive or focused activities. At their most extreme, these result in an eccentric whose life is characterised by its routine, rigid and systematic approach and whose world might narrow down to railway timetables or stamp collecting. Any development of an interest remains circumscribed (for example, restricted simply to collecting more of something rather than gaining wider expertise) and, far from becoming the basis of a social network, is enjoyed in solitude.
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However, whatever its purpose, a diagnosis should only be given if it has a useful function.
Assessment follows diagnosis and it should be broad and multidisciplinary (Howlin, 2000), in particular, taking account of:
Diagnosis and assessment in Asperger syndrome
Many people with Asperger syndrome misperceive their circumstances. It is therefore essential to obtain a comprehensive picture of them that includes the accounts of others such as parents, friends, teachers and employers (Green et al, 2000).
A report of the assessment should be given to the patient in writing, to avoid misunderstandings that might arise with spoken communication.
If Asperger syndrome is suspected, diagnosis needs a clinician familiar with the syndrome as well as with the alternatives. The diagnostic judgement should be based on a developmental history (that takes a lifelong perspective) combined with a present state examination designed to identify the features of autism.
Diagnostic instruments
Diagnostic instruments help clinicians in the systematic collection of the right information, which they might match against criteria that, although evolving, hold them to a consistent threshold and a broad conceptual construct. Matching may be refined by an algorithm, but in practice, such mechanical simplicity can be misleading, particularly when there is a comorbid overlay.
Furthermore, although a number of diagnostic instruments have been developed to identify autism, the few that have been designed specifically for Asperger syndrome are mostly intended as screening questionnaires. They vary in the extent to which they are structured, ranging from the very specific, self-rating Australian Questionnaire (Attwood, 1999) through to the Asperger Syndrome Diagnostic Interview (ASDI), a simple framework that has good interrater reliability (Gillberg et al, 2001).
The more formal, structured interviews, such as the Autism Diagnostic Interview Revised (ADIR; Lord et al, 1994), were initially developed as research instruments to identify children with clear-cut autism. Broader instruments have since evolved, such as the Diagnostic Instrument for Social and Communication Disorders (DISCO). The Autism Diagnostic Observation Schedule (ADOS; Lord et al, 2000), a subject interview designed to elicit the signs of autism, has a module for able and fluent adolescents and adults. The International Molecular Genetic Study of Autism Consortium intend to publish their Family History Interview (FHI), a set of schedules that includes matching subject and informant interviews as well as a scale to record observed behaviour. Whatever instrument is used, it is essential that it takes account of childhood as well as current symptoms.
Many people will have diagnosed themselves from books and self-rating scales and are seeking formal confirmation. A screening assessment focusing only on current symptoms may be relatively brief, particularly if it complements a psychiatric interview. A more definitive diagnostic interview can require several hours and is not something to undertake without good reason.
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| Box 2 Differential diagnoses Anxiety states
Attention-deficit hyperactivity disorder Schizophrenia (particularly treatmentresistant)
Personality disorders
Obsessivecompulsive disorder
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Schizophrenia
Despite Aspergers early intent, it was only in 1971 that autism was distinguished from schizophrenia, although a number of subsequent reports have suggested that it might yet be identified as a predisposing factor. The similarity of Asperger syndrome to a preschizophrenic, schizoid personality disorder as well as to residual schizophrenia, in both clinical presentation and neurobiology, has led to a diagnostic confusion that has not taken account of their differing developmental trajectories. Such suggestions of a return to the concept of the unitary psychosis arise where association has been mistaken for causation both may have similar underlying anomalies giving rise to similar, but not identical symptomatology (Box 3
).
Box 3 Mistaking Asperger syndrome for psychosis
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Although it is doubtful that an autistic-spectrum disorder predisposes to schizophrenia (Tantam, 2003; Howlin et al, 2004), it certainly does not protect. If psychosis arises, early treatment is so important to prognosis that it should not be delayed by diagnostic doubts. However, it must be recognised that, once a patient has been established on neuroleptics, it can be difficult to disentangle the two disorders.
Affective disorders
Affective disorders occur more frequently in Asperger syndrome than in the normal population. The inability to label internal feelings can lead to their expression in confusing and even bizarre ways.
Chronic dysphoria may merge with more clear-cut depression, anxiety with phobic states, and over-arousal with panic. All can respond to serotonergic medication. This raises the issue of how readily and how early medication should be tried, particularly in the light of the reservations about the use of the serotonergics in depression (Nutt, 2003). Although one positive randomised controlled trial is available (McDougle et al, 1995a), most of the evidence of their efficacy in autism comes from open trials and is limited to the longer-established SSRIs. Individual patients resort to 5-hydroxytryptophan or St Johns wort.
Obsessivecompulsive disorder
A natural reaction to the mess of everyday life is to establish order (although the greater the success in achieving a set, predictable world, the greater the distress when faced with novelty and change). For a person with Asperger syndrome this reaction may become pathological: for example, the commonplace collection of objects can come to dominate his life as well the lives of those around him, and if all sense of proportion is lost an obsession can lead to criminal offending.
Management includes the use of standard techniques to cope with obsessions and routines diversion, environmental change, pictorial or written preparation for change, and the introduction of alternative rules and routines as well as of limits.
Serotonergic drugs can reduce the obsession, although finding the right drug may take a number of trials and, once found, its effect may be only partial and temporary. Medication does allow the introduction of changes in an individuals life and of behaviour that might reduce the likelihood of recurrence.
Obsessional traits run through much of biological psychiatry as well as being an overlapping familial trait in autistic-spectrum disorders (Hollander et al, 2003). The absence of internal resistance and anxiety in autistic disorders has caused some to question whether this is truly obsessivecompulsive disorder (Baron-Cohen, 1989), particularly because the content of the thoughts and the form of compulsive behaviour differ from that of the neurotypical person (McDougle et al, 1995b). All the same, as the management is similar, the distinction may be academic.
Other developmental disorders
Asperger syndrome has been linked with ADHD, tic disorders (including Tourette syndrome) and various specific learning disabilities, notably disorders of executive function and motivation that make it difficult for an individual to develop an occupation.
Alcoholism
Alcohol is an effective tranquilliser, particularly for someone who finds social groups uncomfortable. Asperger syndrome can add a compulsive quality to social drinking and encourage isolated drinking ungoverned by normal societal conventions. The evidence for alcohol misuse in Asperger syndrome is more anecdotal than quantified by systematic research, but its significance lies in the quality of its psychopathology rather than in any increase in frequency of drinking.
Offending
A reluctance to link any disorder with criminality, a tolerance for disturbance in anybody with disability and an unwillingness to prosecute where conviction is uncertain, all combine to mask any association between psychiatric disorder and offending. However, there is a case for suspecting the undiagnosed syndrome in a number of forensic presentations (Box 4
) as a number of predispositional elements come with Asperger syndrome (Box 5
). Various factors combine to make violent aggression relatively frequent in Asperger syndrome: hitting people was a problem in 40% of a large case series (Tantam, 2003).
| Box 4 Forensic presentations The following criminal behaviours might indicate undiagnosed Asperger syndrome:
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Box 5 Characteristic features of Asperger syndrome that predispose to criminal offending
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Many of the characteristics listed in Box 5
affect the individuals capacity to make valid decisions, thus limiting his level of responsibility. Whether someone is identified as an offender (as distinct from someone who has committed an offence) depends on chance factors in their environment such as the effectiveness of their supervision, the recognition of autistic-spectrum disorder and the understanding of those around.
Reliability as a witness
The report of an event depends on what the observer actually saw, their interpretation of the scene and on their memory. Certain characteristics of Asperger syndrome, such as those listed in Box 6
, colour individuals understanding and recall of a situation. Consequently, in deciding on fitness to act as a witness it is important to assess, first, the individuals ability to give a reliable account. Here it is essential to get enough specific, concrete, verifiable material such as details of the scene (e.g. the clothing worn and the colour and pattern of the wallpaper), as well as of the events preceding and following the episode, to be able to identify any temporal confusion.
Box 6 Features of Asperger syndrome that affect an individuals reliability as a witness
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Second, the individuals ability to give a good account and to comprehend and to respond to questions must also be assessed. Allowance must be made for communication problems such as the use of words without understanding their significance, the characteristic, very literal comprehension, and the inability to take in non-verbal components. Here the use of visual aids, particularly written text, can help communication, which may be made even more friendly by the use of a computer.
There is a risk that individuals with Asperger syndrome may not be recognised as vulnerable adults, particularly if they have a good academic awareness of right from wrong. How they present themselves becomes of particular importance with the removal of the right to silence, as it can affect fitness to plead (Gray et al, 2001).
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Education
School
Life in a small primary school, with consistent classmates, the same classroom and the same teacher, can be sufficiently straightforward for children to cope. It is when they move from this relative stability into the secondary school confusion of different sets and multiple teachers that they are tested and their true degree of disability becomes apparent.
Education needs to be unusually broad and explicit as these students develop on a wide variety of fronts. Besides supervision to cope with organising and completing academic tasks, they will need support to develop self-help skills in everyday areas such as shopping, laundry and cleanliness (where obsessionality may block self-care) and social skills (conversation, dating, coping with authority, asking for help) (Attwood, 2000). All of these have to be taught if individuals with Asperger syndrome are to develop the sense of a positive identity and competence that comes more naturally to normal, neurotypical young people.
Further education
Further education gives the opportunity to learn the skills necessary to cope with employment, higher education or simply everyday life. Although sector colleges are becoming better geared to students with special needs, they are limited by their structure, funding and expertise. People who are unusually awkward, sensitive, violent or disturbed may require a place at a specialist college. These provide a compatible peer group, staff with understanding and expertise, and considerable support.
Funding for up to 3 years of specialist further education can be obtained for individuals between the ages of 16 and 25 years. It is intended for those who want to progress beyond school-leaving but do not have the skills or ability to cope with sector college.
Higher education
Although social demands may be less than in other forms of education, the lack of structure and supervision defeat many who are otherwise academically able. In England, the Special Education Needs and Disability Act 2001 (SENDA) has established legal rights for disabled students and has outlawed discrimination in education at all ages. Students can declare their disability on application to a university or college.
A number of universities have put in place measures to help students with autistic-spectrum disorders (Box 7
). Such measures may create a more sympathetic setting than any previously experienced and bring the hope that earlier disturbance, the consequence of an uncomfortable environment, will evaporate. However, no matter how specialist the college or attuned the university, it cannot be a substitute for an adolescent psychiatric unit or a therapeutic community if it is to retain an academic climate.
Box 7 Measures adopted by universities to help students with autistic-spectrum disorders
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Employment
People with Asperger syndrome often find themselves in a maze guided by disability specialists with limited knowledge of the disorder. Their difficulties start with the skills required for a job interview. Then there is the need to cope with people, the unpredictable and the unexpected that are part of many jobs. Even jobs that seem ideal, for example that capitalise on special interests or a methodical approach, can fail should an individual become bogged down in ritual slowness or should his interest take over an enthusiasm for timetables has to remain subservient to giving others the information. The successful post takes these factors into account and builds in support so that, when things start going wrong, they are quickly detected and rectified. Such help may come from a dedicated individual, the job coach, but eventual success will depend on how far the setting and, in particular, others at work are able to take over.
Several specialist schemes have been developed, most notably Prospects, a programme run by the National Autistic Society, which has been very successful in helping people to get and retain jobs, largely at a skilled clerical or technical level. Its experience has been of a workforce characterised by good time-keeping and the ability to get on with work that others might find too repetitive, without being distracted by the temptation to waste time in gossip or to engage in promotion-seeking office politics.
Social care
Many people will need continued everyday support that may range from a regular visitor through to someone living in the same house. For some, this will be to ensure that they eat, care for themselves and continue to take part in society. For others, it will be to help them to avoid or disentangle themselves from the predicaments that arise from their social naïvety, lack of foresight, or odd appearance and behaviour (which can make them the target of childrens abuse and the neighbourhood scapegoat). Some will continue to get this support from parents, others may acquire a partner or friend, and a few will need to employ someone on a formal basis. Many find support irritating and difficult to accept.
Family support
Asperger syndrome adds an unusual complexity to the family, and similar traits in other members may either compound or buffer matters. Parents, partners and siblings may need formal counselling or group work, particularly if they themselves have communication difficulties, an unusual objectivity or a focused persistence. An Asperger support group can offer substantial help.
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It helps that the label of autism attracts substantial funding (more than personality disorder) and that there are a variety of specialist support services. However, although good specialist care services can provide comfortable community placements for very disturbed people, some psychiatric services have found themselves overstretched by over-ambitious care providers that take on more than they can cope with. Supporting and influencing such services in their development might avoid this problem.
The psychiatrist has to keep pace with the growing awareness of patients and the public, as much to exclude Asperger syndrome as to recognise it and its consequences. The effects of comorbid disorder have to be disentangled from the underlying syndrome, and the diagnosis should be used selectively rather than as a catchall for any unclassifiable personality or disorder. The recognition of developmental disorder in an ever-increasing range of social and interpersonal difficulties carries the risk of retracing earlier psychoanalytic paths that medicalised the human condition.
All psychiatric specialties need to develop sufficient knowledge and skill in dealing with autistic-spectrum disorders to avoid accusations of incompetence (Box 8
). An initial step would be to agree the minimum level of expertise and training.
| Box 8 Key reading Attwood (1999) Aspergers Syndrome Haddon (2002) The Curious Incident of the Dog in the Night-Time Howlin (2004) Autism and Asperger Syndrome Preparing for Adulthood Klin et al(2000) Asperger Syndrome Tantam (2003) The challenge of adolescents and adults with Asperger syndrome
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View this table: [in a new window] | MCQ answers |
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