The association between psychiatric diagnoses and severe behavior problems in mental retardation

Prevalence of anxiety and depressive disorders among youth with intellectual disabilities: A systematic review and meta-analysis

BACKGROUND

The purpose of this meta-analytic study was to determine the pooled prevalence estimates of anxiety and depressive disorders among children and adolescents with intellectual disabilities (ID) and to assess the extent to which these pooled prevalence rates differed according to studies' characteristics.

METHOD

A systematic literature search was performed in nine databases and 21 studies, published between 1975 and 2015, met the inclusion criteria.

RESULTS

The resulting pooled prevalence estimates of combined subtypes of anxiety and depressive disorders were respectively (a) 5.4% and 2.8% across samples; (b) 1.2% and 0.03% among children; and (c) 7.9% and 1.4% among adolescents. Pooled prevalence estimates for specific subtypes of anxiety disorders ranged from (a) 0.2% to 11.5% across samples; (b) 0.7% to 17.6% among children; and (c) 0.6% to 19.8% among adolescents. Pooled prevalence estimates of dysthymic disorder and major depressive disorder were respectively (a) 3.4% and 2.5% across samples; (b) 2.1% and 3.2% among children; and (c) 6.9% and 5.7% among adolescents. Finally, subgroup analyses showed significant variations in the pooled prevalence estimates of combined subtypes of anxiety disorders, obsessive-compulsive disorder, and generalized anxiety disorder; and combined subtypes of depressive disorders.

LIMITATIONS

The present findings of this meta-analysis should be interpreted with caution given several limitations related to the characteristics of the populations, diagnostic method and sampling method.

CONCLUSION

Findings provide recommendations for future studies investigating psychological disorders among youth with ID, as well as how clinicians and policy makers can improve diagnostic practices and support for youth with ID.

Genetic architecture for human aggression: A study of gene-phenotype relationship in OMIM

Genetic studies of human aggression have mainly focused on known candidate genes and pathways regulating serotonin and dopamine signaling and hormonal functions. These studies have taught us much about the genetics of human aggression, but no genetic locus has yet achieved genome-significance. We here present a review based on a paradoxical hypothesis that studies of rare, functional genetic variations can lead to a better understanding of the molecular mechanisms underlying complex multifactorial disorders such as aggression. We examined all aggression phenotypes catalogued in Online Mendelian Inheritance in Man (OMIM), an Online Catalog of Human Genes and Genetic Disorders. We identified 95 human disorders that have documented aggressive symptoms in at least one individual with a well-defined genetic variant. Altogether, we retrieved 86 causal genes. Although most of these genes had not been implicated in human aggression by previous studies, the most significantly enriched canonical pathways had been previously implicated in aggression (e.g., serotonin and dopamine signaling). Our findings provide strong evidence to support the causal role of these pathways in the pathogenesis of aggression. In addition, the novel genes and pathways we identified suggest additional mechanisms underlying the origins of human aggression. Genome-wide association studies with very large samples will be needed to determine if common variants in these genes are risk factors for aggression. © 2015 Wiley Periodicals, Inc.

Psychometric properties of the Chinese Behavior Problems Inventory-01 in children and adolescents with or at risk for intellectual disabilities

As the world's most populous country, China is likely to have the highest number of people with intellectual disabilities (ID) in the world. As many people with ID are susceptible to serious and persistent behavior problems, research by Chinese scientists on this public health issue is needed. However, there are only very few reliable Chinese-language behavior assessment instruments for problem behaviors. To fill this gap we translated the Behavior Problems Inventory-01 (BPI-01; Rojahn, Matson, Lott, Esbensen, & Smalls, 2001) into Chinese. The BPI-01 is an informant-based behavior rating instrument that was designed to assess self-injurious behavior (SIB), stereotyped behavior, and aggressive/destructive behavior in individuals with ID. We then assessed the behavior of 222 children and young adults (age range 1.5-21.5 years) with or at risk for ID from three special needs service programs in mainland China. Teachers or staff members, respectively, served as respondents. The Chinese version of the BPI-01 showed good reliability (internal consistency) and good factor validity tested by confirmatory factorial analysis. We conclude that the Chinese version of the BPI-01 can be used for research and clinical evaluation of Chinese children and adolescents with ID.

The association between self-injurious behaviors and autism spectrum disorders

A key area of concern in children with autism spectrum disorders (ASDs) are self-injurious behaviors (SIBs). These are behaviors that an individual engages in that may cause physical harm, such as head banging, or self-biting. SIBs are more common in children with ASD than those who are typically developing or have other neurodevelopmental disabilities. Therefore, it is important that clinicians who work with children with ASD have a solid understanding of SIB. The purpose of this paper is to review the research on the epidemiology of SIB in children with ASD, factors that predict the presence of SIB in this population, and the empirically supported behavioral treatments available.

Correlates of self-injurious, aggressive and destructive behaviour in children under five who are at risk of developmental delay

AIM

Several behavioural correlates of self-injury, aggression and destructive behaviour have been identified in children and young adults with intellectual disabilities. This cross-sectional study aimed to further explore these correlates in very young children with developmental delay.

METHODS

Parents of 56 children (40 male) under the age of five years (mean age 2 years 10 months) completed a questionnaire about their child's behaviour and the presence of behavioural correlates, including repetitive, over-active or impulsive behaviour and more severe developmental delay.

RESULTS

Parents reported very high prevalence of self-injurious, aggressive and destructive behaviour: 51%, 64% and 51%, respectively. A binary logistic regression revealed that a higher score on a measure of overactive and impulsive behaviour significantly predicted the presence of destructive behaviour. A multiple linear regression revealed that both repetitive behaviour and number of health problems approached significance as independent predictors of severe self-injurious behaviour.

INTERPRETATION

Despite the very small sample, several factors emerged as potential predictors of self-injurious, aggressive and destructive behaviour. These findings support the need for further investigation in a larger sample. Confirmation in this age group could help guide the development of targeted early intervention for these behaviours by identifying behavioural risk markers.

An investigation of self-injurious behaviors in adults with severe intellectual disabilities

Self-injurious behavior (SIB) is commonly observed among individuals with intellectual disability (ID) living in state-run supports and services centers. Specific examples of SIB include poking oneself in the eye; harming oneself by hitting, scratching, or pinching; and pica (i.e., swallowing objects causing bodily harm). Previous research has focused on SIB in individuals with ID more generally without focusing on specific levels of ID or taking into account other important personal variables. This study examined 45 adults with severe ID living in two large state-run facilities in the Southeastern United States who were separated into groups for comparison (ASD and non ASD; verbal and nonverbal). Data was collected on the presence of SIB using the Autism Spectrum Disorder-Problem Behavior Adult Version (ASD-PBA). A two-way analysis of variance (ANOVA) was conducted to determine if there were significant differences between groups on rates of SIB. Individuals with ID and ASD exhibited significantly higher rates of SIB than individuals with only ID, F (1,43)=50.84, p<0.05. Furthermore, verbal individuals had significantly higher rates of SIB than nonverbal individuals, F (1,43)=57.612, p<0.05. There was a significant interaction between the effects of ASD diagnosis and verbal ability on rates of SIB, F (1,43)=50.84, p<0.05. The implications of these findings in the context of other research on ID, ASD, SIB, and verbal abilities are discussed.

The age related prevalence of aggression and self-injury in persons with an intellectual disability: a review

The aim of this study was to analyse statistically published data regarding the age related prevalence of aggression and self-injury in persons with intellectual disability. Studies including prevalence data for aggression and/or self-injury broken down by age band were identified and relative risk analyses conducted to generate indices of age related change. Despite conflicting results, the analysis conducted on included studies considered to be the most methodologically robust indicated that the relative risk of self-injury, and to a lesser extent aggression, increased with age until mid-adulthood, with some indication of a curvilinear relationship for self-injury. These conclusions have implications for the understanding of the development of different forms of challenging behaviour and the importance of early intervention strategies.

The association between repetitive, self-injurious and aggressive behavior in children with severe intellectual disability

We evaluated the independent association between adaptive behavior, communication and repetitive or ritualistic behaviors and self-injury, aggression and destructive behavior to identify potential early risk markers for challenging behaviors. Data were collected for 943 children (4-18 years, M = 10.88) with severe intellectual disabilities. Odds ratio analyses revealed that these characteristics generated risk indices ranging from 2 to 31 for the presence and severity of challenging behaviors. Logistic regressions revealed that high frequency repetitive or ritualistic behavior was associated with a 16 times greater risk of severe self-injury and a 12 times greater risk of showing two or more severe challenging behaviors. High frequency repetitive or ritualistic behaviors independently predict challenging behavior and have the potential to be early risk markers for self-injury and aggression of clinical significance.

[Psychopathology in youths with intellectual disabilities--prevalence and prevention]

A survey of epidemiological findings suggests a significantly increased level of emotional and behavioural problems in children and youth with intellectual disabilities. Some biological and social factors are presented which contribute to this elevated risk for psychopathology. Assessment and intervention planning needs to acknowledge genetic dispositions, and limitations of the capacity of information processing which characterise children with intellectual disabilities. Early intervention may help to prevent emotional and behavioural problems by supporting a positive parent-child relationship, increasing the parents' educational competence and assisting preschool teachers in supporting positive relationships with peers, and promoting social competence.

The relationship between psychopathology symptom clusters and the presence of comorbid psychopathology in individuals with severe to profound intellectual disability

In the typically developing population, comorbid psychopathology refers to the co-occurrence of two different psychopathologies other than cognitive impairments. With respect to individuals with intellectual disability, comorbidity is often described as cognitive deficits and one additional psychopathology manifesting together. However, just as within the typically developing population, individuals with intellectual disability may also present with symptoms of two or more additional disorders. The presentation of these symptom clusters may similarly correlate. Therefore, the current study used the Diagnostic Assessment for the Severely Handicapped-II in order to examine relationships between psychopathological symptom clusters in adults with severe to profound intellectual disability. Additionally, we assessed comorbid presentation of disorders other than cognitive impairments in these same adults. Several symptom clusters were identified as being related with moderate to strong positive correlations. Furthermore, elevations on the Impulse subscale were noted to be the most prevalent in the current sample, with comorbid elevations most commonly occurring along the Mood, Mania, and Anxiety subscales. The significance of these findings is discussed.

A study of behaviour profiles among intellectually disabled people in residential care in Hungary

The authors investigated the behavioural dimensions of 269 intellectually disabled (ID) people in residential care in specialized institutions in Tolna county (South-West Hungary) with the aim of screening the frequency and severity of the relevant behavioural symptoms associated with intellectual disability and depending on the level of intellectual impairment. Only 120 residents had an International Classification of Disease (ICD) diagnosis of "mental retardation (MR)" and a valid IQ grading either by means of the Hungarian standard version of the HAWIK or by the coloured Raven test. 4 IQ groups were created: borderline (B), mild (MID), moderate (MOD) and profound (PID) intellectual disability subgroups. The Hungarian pilot version of the Behaviour Problem Inventory (BPI) was used. seventy-two percent of the residents displayed behavioural problems. All scale score means exhibited an enhancing tendency with IQ loss, as both frequency and Seventy increased linearly towards the more severe groups, but significantly only in the category of stereotyped behaviour. The authors focussed on problems of patient recruitment and discussed the measurement of behavioural and other psychiatric symptoms when researchers reported on the increased occurrence of behaviour and psychiatric symptoms in ID populations.

Risperidone for attention-deficit hyperactivity disorder in people with intellectual disabilities

BACKGROUND

Attention deficit hyperactivity disorder (ADHD) is increasingly recognised as occurring in people with intellectual disability (ID), although treatment of ADHD in this population has not ben tested widely. Risperidone has been used to treat ADHD in people with ID, although the evidence for its effectiveness is unclear.

OBJECTIVES

To examine the effectiveness of risperidone for the treatment of attention deficit hyperactivity disorder in people with intellectual disabilities.

SEARCH STRATEGY

In February 2009, MEDLINE, PsycINFO, EMBASE, AMED, ISI Web of Science and WorldCat Dissertations were searched using an extensive list of synonyms for ADHD and ID. CENTRAL, CCDPLP, Current Controlled Trials meta-register (mRCT), CenterWatch, NHS National Research Register, clinicaltrials.gov were searched, pharmaceutical companies and experts in the field were contacted. Reference lists of review articles were examined and citation searches were performed in ISI Web of Knowledge.

SELECTION CRITERIA

All randomised controlled trials (RCTs), both published and unpublished, in any language, in which children or adults with ADHD and ID were treated with risperidone.

DATA COLLECTION AND ANALYSIS

Data collection and analyses were planned but not performed due to a lack of suitable studies.

MAIN RESULTS

Eleven studies were considered but none were suitable for inclusion.

AUTHORS' CONCLUSIONS

There is no evidence from RCTs that risperidone is effective for the treatment of ADHD in people with ID. Prescribing in this population can only be based on open-label studies or extrapolation from research in people with autism and disruptive behaviour disorders; however these studies have not investigated people with ID separately so there are reservations regarding the applicability of these findings. Research into effectiveness and tolerability is urgently needed.

The overlap between psychiatric symptoms and challenging behaviour: a preliminary study

Increasingly, challenging behaviour is explained by way of psychiatric symptomatology. This poses possible pitfalls. First, the possibility exists that both psychiatric symptoms and challenging behaviour are concurrent expressions of common underlying factors. Second, psychiatric symptoms may be rated as present on the basis of challenging behaviour, which may render it more difficult to explain the latter by way of the former. The present study was conducted in order to investigate possible overlaps between psychiatric symptoms and challenging behaviour, when symptoms are rated by caregivers. The results indicate considerable overlaps. Implications for explaining challenging behaviour are discussed, as well as limitations of the study, first and foremost the use of untrained assessors and small sample size.

Amfetamine for attention deficit hyperactivity disorder in people with intellectual disabilities

BACKGROUND

Attention-deficit hyperactivity disorder (ADHD) is increasingly recognised as occurring in people with intellectual disability (ID), although treatment of ADHD in this population has not been tested widely. Amfetamine has been used to treat ADHD in people with and without ID, although the evidence for its efficacy in people with ID is unclear.

OBJECTIVES

To examine the effectiveness of amfetamine for the treatment of attention deficit hyperactivity disorder in people with intellectual disabilities.

SEARCH STRATEGY

MEDLINE, PsycINFO, EMBASE, AMED, ISI Web of Science and WorldCat Dissertations were searched using an extensive list of synonyms for ADHD and ID. CENTRAL, Current Controlled Trials meta-register (mRCT), CenterWatch, NHS National Research Register, clinicaltrials.gov were searched in August 2007. Pharmaceutical companies and experts in the field were contacted. Reference lists of review articles were examined and citation searches were performed in ISI Web of Knowledge.

SELECTION CRITERIA

All randomised controlled studies, both published and unpublished, in any language, in which children or adults with ADHD and ID were treated with amfetamine.

DATA COLLECTION AND ANALYSIS

Data were extracted independently by two reviewers using a standardised extraction sheet. Risk of bias was assessed by two authors using a standardised framework. Meta-analyses were planned but were not performed due to a lack of suitable studies.

MAIN RESULTS

Only one study was suitable for inclusion. This was a cross-over study in 15 children with ADHD, ID and Fragile X syndrome. Duration of treatment was only one week. No significant difference was reported between amfetamine and placebo for any of the ADHD measures, but significantly more side effects were reported while taking amfetamine, mainly mood lability and irritability.

AUTHORS' CONCLUSIONS

There is very little evidence for the effectiveness of amfetamine for ADHD in people with ID . Prescribing in this population is based on extrapolation of research in people without ID. More research into effectiveness and tolerability is urgently needed.

Behaviour problems in institutionalised people with intellectual disability and schizophrenia spectrum disorders

BACKGROUND

Although our understanding of dual diagnosis has improved, a deficit still exists in our knowledge of how schizophrenia spectrum disorders (SSD) manifest themselves in individuals with intellectual disability (ID). In addition, little is known about the relationship between behaviour problems and psychopathology in this population.

METHOD

Utilising the Behavior Problems Inventory (BPI), three areas of problem behaviour (self-injurious, stereotyped, and aggressive/destructive) were assessed in 58 individuals with ID divided into three groups (with SSD, with a diagnosis of psychopathology other than SSD, and with ID only) and a total BPI score was calculated for each.

RESULTS

The SSD group was unique when compared to the Control group (ID only) for frequency of stereotyped behaviours. Further, severity of stereotyped behaviours in the SSD group was unique compared to the Psychopathology and Control groups.

CONCLUSION

The SSD group was unique compared to the other two groups, particularly for severity of stereotyped behaviours. Many specific behavioural differences were also related to either SSD or general psychopathology.

Behavioral assessment and treatment of self-injurious behavior in autism

Self-injurious behaviors (SIB) are common in individuals who have autism and related developmental disabilities. When an individual engages in SIB, these behaviors frequently become the primary treatment target because of the potential for injury. A thorough behavioral assessment aimed at determining the function of the behaviors is the first step to developing a treatment plan. This article presents a brief background of SIB and a discussion of the behavioral assessment and treatment of these behaviors to familiarize readers with the behavioral perspective on SIB in individuals who have autism and other developmental disabilities.

Psychiatric disorders and behavior problems in people with intellectual disability

The relationship between behavior problems and psychiatric disorders in individuals with intellectual disability is still unresolved. The present study compares the prevalence and pattern of psychiatric disorders in individuals with intellectual disability who were assessed on the ABC to have moderate and severe behavior problems and a matched group of individuals without such problems. Both groups were living in community settings and had their intellectual disability varied from mild to profound degrees. The participants were screened for psychiatric disorders using four different instruments; the Reiss Screen, the Mini PAS-ADD, the DASH-II and the ADD. The group with moderate and severe behavior problems showed significantly more symptoms of psychiatric disorders than the group without such problems when items related to behavior disorders were omitted, and the majority of the participants with behavior problems had symptoms of the main psychiatric disorders. The participants with mild and moderate intellectual disability showed more symptoms of psychosis and depression than the participants with severe and profound intellectual disability. There were no direct associations between individual behavior problems and psychiatric disorders, but the group with mild/moderate intellectual disability showed a somewhat different pattern of associations than the group with severe/profound intellectual disability. Depression was associated with screaming and aggression in the participants with severe and profound intellectual disability, and with self-injury in the participants with mild and moderate intellectual disability. The finding that the majority of the participants with behavior problems showed symptoms of psychiatric disorders suggests that many behavior problems may be (unconventional) symptoms of psychiatric disorders or reflect a difficult life situation caused by a psychiatric disorders, or that a difficult life situation may contribute to both psychiatric disorders and behavior problems in individuals with intellectual disability.

Rate and characteristics of men with an intellectual disability in pre-trial detention

BACKGROUND

Various lines of research point to the overrepresentation of individuals with intellectual disability (ID) in the criminal justice system. Studies have also shown that individuals with ID are vulnerable to mental health problems. To date there have been no Canadian studies of individuals with an ID in the criminal justice system.

METHOD

The present study reports on the sociodemographic, mental health and criminological characteristics of 281 individuals with an ID from a Canadian study of men in a pre-trial holding centre.

RESULTS

Almost 19% of the men had a probable ID, and nearly one-third (29.9%) were in the borderline IQ range. As was the case for their non-ID counterparts, the mean age of the probable ID group was in the early 30s, few were employed, and most had low incomes. Individuals in the probable and borderline ID groups had lower rates of high school completion than those in the average intellectual ability range. Over 60% of individuals with an ID had a substance use disorder, and 1 in 5 was intoxicated at the time of assessment. These rates were similar across groups, and to those found in the literature. A large majority of individuals with ID had a previous conviction, and most had previously committed a violent offence.

CONCLUSIONS

Among other limitations, the sample may not have been entirely representative of the total population of men in the pre-trial detention centre, given the relatively high refusal rate (39.5%). Results are discussed in terms of orienting criminological and mental health services as a function of the level of intellectual and adaptive functioning of individuals with ID.

Behavioral and Emotional Problems in Young People with Pervasive Developmental Disorders: Relative Prevalence, Effects of Subject Characteristics, and Empirical Classification

Parents or teachers rated 487 non-clinically referred young people with Pervasive Developmental Disorders on the Nisonger Child Behavior Rating Form. The objectives of the study were to examine the relative prevalence of specific behavior problems, assess the impact of subject characteristics, and derive an empirical classification of behavioral and emotional problems for this population. Results indicated that the youngsters experienced high rates of behavior and emotional problems. Cluster analysis suggested that six- and eight-cluster solutions best fit the ratings provided by parents and teachers, respectively. Both parent and teacher cluster solutions contained groups of children characterized as problem free, well adapted, hyperactive, anxious, and with undifferentiated behavior disturbances. The empirically derived clusters were supported by data external to the analyses.

The Psychopharmacologic Treatment of Violent Youth

Aggressive violence has been described as the greatest problem and the most frequent reason for referrals in child and adolescent psychiatry. In this country we have only partially emerged from an epidemic of violence that was really an epidemic of youth violence. Thus it is hardly surprising that psychiatrists are being asked more and more frequently whether psychiatric medications might help to diminish the toll from this behavioral plague. Medications are useful and appropriate for only a small minority of the people who commit serious violence. Even when they are indicated, they can never be the sole treatment modality, but should be supplemented by psychological and social therapies. When the violence is a byproduct or symptom of an underlying mental illness, treating that illness is generally the most effective method of preventing future violence on a long-term basis. However, most violence is not committed by those who are mentally ill, and most of the mentally ill never commit a serious act of violence. That is why many attempts have been made to discover whether there are drugs that diminish the symptom, violence, even when there is no underlying mental illness for which drugs would normally be prescribed. In fact there are several, and their indications and use are reviewed here. Different principles govern the acute short-term emergency treatment of a violent crisis and the long-term treatment of those who are chronically and repetitively violent, and these differences are also summarized here.

Learning disability among referrals to a community child psychiatric service

Objectives:We sought to determine the frequency of learning disability (IQ > 70) among referrals over a period of six years to a community child psychiatric service in a socially disadvantaged area of Dublin.

Methods:We investigated the gender and age characteristics, as well as the frequency of speech and language, emotional, and behavioural problems in this group. We tried to determine what educational help each child was receiving at the time of referral.

Results:Sixty-five of 942 patients referred to the clinic had a mild (60) or moderate (five) learning disability. Forty-eight patients were male and 17 were female. The mean age at referral was 10.5 years, and there was no gender difference. All were referred because of educational problems. Behavioural disorders were present in 31, emotional disorders in 13 and speech and language disorders in 37. Six had suffered some form of abuse, mostly emotional. Five had problems with concentration or markedly impulsive behaviour. At the time of referral, 10 were in special schools, seven were in special classes in normal schools, and nine had a special resource teacher. Adequate educational support was not being adequately provided for 33 at the time of psychiatric referral.

Conclusions:Learning disability occurs in 7% of children referred to the child psychiatry clinic of a disadvantaged urban community and, while this may reflect the late onset of psycho-social and educational problems in such children, these findings give cause for concern that delayed referral may exacerbate their and their families' problems. The educational needs of most of the children were not being addressed. Reasons for these findings are discussed.

Neuropsychiatric symptoms of fragile X syndrome: pathophysiology and pharmacotherapy

Fragile X syndrome is the leading inherited form of mental retardation, and second only to Down's syndrome as a cause of mental retardation attributable to an identifiable genetic abnormality. Fragile X syndrome is caused by a defect in the fragile X mental retardation 1 gene (FMR1), located near the end of the long arm of the X chromosome. FMR1 normally synthesises the fragile X protein (FMRP), but mutations in FMR1 lead to a lack of FMRP synthesis, resulting in fragile X syndrome. While the specific function of FMRP is not yet fully understood, the protein is known to be important for normal brain development. The physical, cognitive and behavioural features of individuals with fragile X syndrome depend on gender (females have two X chromosomes, one active and one inactive) and the molecular status of the mutation (premutation, full mutation or mosaic). Features of the behavioural profile of individuals with fragile X syndrome include hypersensitivity to stimuli, overarousability, inattention, hyperactivity and (mostly in men) explosive and aggressive behaviour to others or self. Social anxiety, other anxiety disorders, depression, impulse control disorder and mood disorders are the most common psychiatric disorders diagnosed in individuals with fragile X syndrome, although no formal studies have been undertaken. There have been very few psychopharmacological studies of the treatment of behaviours associated with fragile X syndrome. These limited studies and surveys of psychotropic drugs used in individuals with fragile X syndrome suggest that stimulants are helpful for hyperactivity, that alpha(2)-adrenoceptor agonists and beta-adrenoceptor antagonists help to control overarousability, impulsivity and aggressiveness, and that SSRIs can control anxiety, impulsivity and irritability, alleviate depressive symptoms and decrease aggressive and self-injurious behaviour. Typical and atypical antipsychotics in combination with other psychotropics have been used for control of psychotic disorders and severe aggressive behaviours. Mood stabilisers have been found to be useful when mood dysregulation or mood disorders are present with or without aggressive behaviour. Folic acid and L-acetylcarnitine (levacecarnine) have not been found to improve deficits or behaviours. As there is no specific psychotropic drug for any of the deficits or behaviours associated with fragile X syndrome, clinicians are advised to diagnose any psychiatric syndromes or disorders present and treat them with the appropriate psychotropic drug. If no psychiatric disorder can be diagnosed and the patient's challenging behaviours cannot be controlled with environmental manipulation or behaviour modification techniques, the most benign psychotropic drug should be used. Antipsychotics should be reserved for psychotic disorders, for impulse control disorders (used in combination with other psychotropics), or when challenging behaviours constitute an emergency. In the future, new medications targeting molecules implicated in the modulation of anxiety, fear and fear responding will be useful for treating the social anxiety and overarousability exhibited by individuals with fragile X syndrome.

Prevalence of psychiatric symptoms in adults with mental retardation and challenging behaviour

The relation between psychiatric symptoms and different types of challenging behaviour in adults with mental retardation was investigated, using an instrument designed for use by non-specialist informants. A sample of 165 persons with mental retardation was surveyed for the presence of psychiatric symptoms, level of mental retardation, and self-injurious and other types of challenging behaviour. Challenging behaviour was associated with increased prevalence of psychiatric symptoms, especially anxiety and psychosis, less with hypomania, and not with depression. No association between anxiety and self-injurious behaviour was found. An association between psychiatric symptoms and challenging behaviour on a group level is an initial step towards understanding causes of challenging behaviour. Issues remain, like how causation takes place on an individual level, and the nature of psychiatric disorders in persons with severe and profound mental retardation.

DSM-IV disorders in children with borderline to moderate intellectual disability. I: prevalence and impact

OBJECTIVE

To assess the prevalence, comorbidity, and impact of DSM-IV disorders in 7- to 20-year-olds with intellectual disability.

METHOD

A total of 474 children (response 86.8%) were randomly selected from a sample of students from Dutch schools for the intellectually disabled. Parents completed the anxiety, mood, and disruptive disorder modules of the Diagnostic Interview Schedule for Children.

RESULTS

A total of 21.9% of the children met the DSM-IV symptom criteria for anxiety disorder, 4.4% for mood disorder, and 25.1% for disruptive disorder. Similar prevalence rates were found for children who screened positive or negative for pervasive developmental disorder. More than half of the children meeting the criteria for a DSM-IV disorder were severely impaired in everyday functioning, and about 37% had a comorbid disorder. Children with multiple disorders were more likely to be impaired across various areas of everyday functioning. Almost 27% of the diagnosed children received mental health care in the last year. Comorbidity and impairment in everyday functioning increased the likelihood of referral.

CONCLUSIONS

Most disorders can be observed in intellectually disabled children. Impairment and comorbidity are high. The finding that less than one third of the children with a psychiatric disorder receive mental health care deserves attention.

Psychopharmacological treatments in persons with dual diagnosis of psychiatric disorders and developmental disabilities

People with developmental disabilities are at considerable risk for the development of comorbid psychiatric conditions. Psychopharmacological treatments may have a crucial role in a multidisciplinary and multimodal approach to the management of psychopathology in this population. Psychiatric illnesses that are particularly amenable include mood disorders, anxiety disorders, schizophrenia, and attention deficit hyperactivity disorders (ADHDs) and antidepressants, mood stabilisers, anxiolytics, antipsychotics, and stimulants should be considered, respectively. ADHD may also respond to alpha(2)-agonists. Psychotropic agents such as beta-antagonists can target aggressive, self injurious, and stereotypical behaviours and opioid antagonists may be helpful in treating self injurious behaviour and stereotypy. Selective serotonin reuptake inhibitors, newer anticonvulsants, and atypical neuroleptics are preferred when treating psychiatric disorders among people with developmental disabilities. This paper will review the major studies of pharmacological treatment of mental illness in individuals with developmental disabilities.

Patients with and without intellectual disability seeking outpatient psychiatric services: diagnoses and prescribing pattern

BACKGROUND

The present study examined the presenting problem of psychiatric outpatients, and resulting diagnostic and prescribing patterns, comparing patients with intellectual disability (ID) with non-ID (N-ID) patients seen in the same clinic.

METHODS

This study was a retrospective medical chart review of information in the first psychiatric diagnostic evaluation for the most recent 100 adult patients with mild ID, 100 patients with moderate, severe or profound ID, and 100 matching N-ID patients.

RESULTS

There were significant differences in rates of medical illness, disabilities, history of marriage, children, independent living, and family history of psychiatric and neurological disorders. Individuals with ID were more likely to present with aggression, self-injurious behaviour or physical complaints, whereas N-ID subjects presented more frequently with depression and anxiety complaints. For all groups, depressive disorders were the most frequent class of diagnoses. For those with ID, antipsychotics were used in 32% of subjects, with mood stabilizers in 28% and antidepressants in 27%. The N-ID subjects were most frequently prescribed antidepressants (40%) and anxiolytics (22%). Polypharmacy did not differ significantly among groups.

CONCLUSIONS

Psychiatric practitioners relied on the diagnostic examination to formulate their diagnosis, whereas the chief complaint reflected the view of caregivers of the subjects with ID. In contrast to previous studies, outpatient providers frequently diagnosed depression, and the prescribing pattern showed increased usage of antidepressants and mood stabilizers.

Challenging behaviours should not be considered as depressive equivalents in individuals with intellectual disability

BACKGROUND

Depression is one of the most common forms of psychopathology in people with intellectual disability (ID). The present study evaluated the utility of an expanded assessment of psychiatric symptoms and challenging behaviours, as measured by the Clinical Behavior Checklist for Persons with Intellectual Disabilities (CBCPID).

METHODS

The CBCPID was administered to 92 people with ID, 35 of whom were diagnosed with a depressive disorder.

RESULTS

Item and factor analysis of the scale indicated that depression was best assessed using the core DSM-IV symptoms of depressive disorder. Challenging behaviours such as self-injury or aggression were not closely associated with depression. Short scales using the core DSM-IV symptoms of depression were highly internally consistent. There was also evidence of the validity of these scales.

CONCLUSIONS

This study found no evidence that challenging behaviours were depressive equivalents in this population. The present authors conclude that the assessment of depression in people with ID should focus on the core DSM-IV symptoms of depression.

Assessing emotional and behavioral problems in children with intellectual disability: revisiting the factor structure of the developmental behavior checklist

The objective of the reported study was to reassess the factor structure of the Developmental Behaviour Checklist (DBC) in a large cross-cultural sample representing all levels of intellectual disability. Parent and teacher DBC ratings on a combined sample of 1536 Dutch and Australian children and adolescents (ages 3-22) with mild to profound intellectual disability were used. Principal components analyses produced five subscales: Disruptive/Antisocial, Self-Absorbed. Communication Disturbance, Anxiety, and Social Relating, explaining 43.7% of the total variance. Internal consistencies of these subscales ranged from .66 to .91. The revised factor structure of the DBC appears to be an improved and useful tool for assessing emotional and behavioral problems in children with intellectual disabilities.

Emotional and behavioral problems in children and adolescents with and without intellectual disability

BACKGROUND

The main objective of this study was to assess and compare the prevalence of a wide range of emotional and behavioral problems in children with and without intellectual disability (ID).

METHODS

We studied 1,041 non-residential children randomly selected from special schools for educable (IQ 60 to 80) and trainable (IQ 30 to 60) children without severe additional physical or sensory impairments, and compared them to 1,855 children randomly selected from the general population (both ages 6 to 18). Parents completed the Child Behavior Checklist (CBCL), and teachers the Teacher's Report Form (TRF).

RESULTS

Controlling for sex, age, and socioeconomic status, we found that both educable and trainable children had significantly higher mean scores on all CBCL and TRF scales than children without ID, except for trainable children on the scales Anxious/Depressed and Somatic Complaints. Almost 50% of children with ID had a Total Problem score in the deviant range compared to about 18% in children without ID. Compared to children without ID, the most prominent problem behaviors of educable children were Social Problems, Attention Problems, and Aggressive Behavior, and trainable children had an increased risk for Social Problems, Attention Problems, Withdrawn and Thought Problems.

CONCLUSIONS

Elevated scale scores reflected differences between children with and without ID over a broad range of items, and not solely on items more likely to be related to developmental delay. Therefore, problem areas covered by the items in these scales deserve special attention in the mental health care of children with ID.

Behaviour/mental health problems in young adults with intellectual disability: the impact on families

BACKGROUND

The present authors studied the impact of dual diagnosis [i.e. intellectual disability (ID) and mental disorder] in young adults on their mothers' perceived levels of stress and decisions about placement.

METHODS

The mothers of 103 young adults with severe ID were interviewed using a 2-3-h in-depth protocol of measures designed to assess their child's adaptive functioning, maladaptive behaviour, mental health problems and negative impact on the family, as well as their own thoughts on out-of-home placement. The Scales of Independent Behavior--Revised Problem Behavior Scale assessed problem behaviours and the Reiss Screen assessed mental disorder.

RESULTS

These measures were highly correlated (r = 0.64), but tapped some different domains of maladaptive behaviour and proved to be most predictive when employed together. Behaviour and/or mental health (B/MH) problems significantly predicted the mothers' perceived negative impact of the young adult on the family, even after controlling for other young adult characteristics. These problems also predicted the family's steps toward seeking out-of-home placement, as did better young adult health and the mother's higher educational attainment; stress did not predict additional variance in placement once these variables were accounted for.

CONCLUSIONS

The discussion focuses on the implications for service provision to families of young adults with B/MH problems.

Factor analysis and norms for parent ratings on the Aberrant Behavior Checklist-Community for young people in special education

The parents of 601 children and adolescents, responding to a mail survey, rated their children on the Aberrant Behavior Checklist-Community (ABC-C). Factor analysis of ABC-C ratings revealed a factor structure that was similar to the original ABC but without the fifth factor (Inappropriate Speech). Coefficients of congruence were moderate to large for the four-factor model, and alpha coefficients were moderate to high when the original item assignment was imposed. Confirmatory factor analysis indicated a modest level of fit with the traditional method of scoring the ABC and acceptable fit when the items were coded for occurrence (0 or 1). Analysis of subject variables revealed main effects for gender on one subscale (Hyperactivity), main effects for age on two subscales (Irritability; Hyperactivity), and one main effect for classroom assignment on the Stereotypic Behavior subscale. Normative data for parent ratings were presented by age and gender combined, gender alone, and age alone. With some qualifications, the ABC-C appears to be valid for assessing children in special educational settings, although further research is needed on the ABC's factor structure in this population.

The Behavior Problems Inventory: an instrument for the assessment of self-injury, stereotyped behavior, and aggression/destruction in individuals with developmental disabilities

The Behavior Problems Inventory (BPI-01) is a 52-item respondent-based behavior rating instrument for self-injurious, stereotypic, and aggressive/destructive behavior in mental retardation and other developmental disabilities. Items are rated on a frequency scale and a severity scale. The BPI-01 was administered by interviewing direct care staff of 432 randomly selected residents from a developmental center between the ages of 14 to 91 years. For 73% of those selected, at least one problem was endorsed on the BPI-01. A total of 43% showed self-injury, 54% stereotyped behavior, and 38% aggressive/destructive behavior. Confirmatory factor analysis and item-total correlations supported the three a priori factors. Analyses of variance (ANOVA) showed that of the variables age, sex, and level of mental retardation, only the latter had a significant effect on the BPI-01 total score, the SIB subscale score, and the Stereotyped Behavior subscale score. Aggression/destruction was not significantly related to any of the three variables. Individuals with a diagnosis of pervasive developmental disorder had higher scores on all three subscales than those without, whereas residents with a diagnosis of stereotyped movement disorder had higher Stereotyped Behavior scale scores than those without. The BPI-01 was found to be a reliable (retest reliability, internal consistency, and between-interviewer-agreement) and valid (factor and criterion validity) behavior rating instrument for problem behaviors in mental retardation and developmental disabilities with a variety of potentially useful applications. Strengths and limitations of the instrument are discussed.

The stereotyped behavior scale: psychometric properties and norms

The Stereotyped Behavior Scale (SBS) is an empirically developed behavior rating scale for adolescents and adults with mental retardation (Rojahn, Tassé & Sturmey, 1997). Since the original publication, one item was deleted and two items were merged, leaving 24 items. In an additional change, severity scales were added to the frequency scales. In this paper, psychometric properties and (relative) norms for the new SBS are presented. In the psychometric study, 45 adults with mental retardation from a residential facility participated. Of these, 15 were selected for high-rates or very severe forms of stereotyped behaviors, 15 for mild to moderate rates or less severe stereotypies, and 15 for the low rates or absence of stereotyped behaviors. Direct care staff familiar with the participants completed the SBS and the "Stereotypy" subscale of the Aberrant Behavior Checklist-Residential (ABC-R) (Aman, Singh, Stewart & Field, 1985). For 15 participants, two raters independently completed the SBS. In addition, 45-min direct behavior observations were conducted on 16 participants. After approximately four weeks, the instruments were completed a second time by the same raters. As for reliability, the SBS frequency and severity scale total scores yielded test-retest intraclass coefficients (ICC) of 0.93 and 0.71, ICC interrater agreement of 0.76 and 0.75, and each had an internal consistency a of 0.91. For criterion validity, the SBS frequency and severity scores correlated with the ABC-R "Stereotypy" score at 0.80 and 0.84 (Pearson r), with systematic behavior observations at 0.50 and 0.65 (Pearson r), and with the a priori classification at 0.50 and 0.65 (Spearman p). From a previous data set of 550 individuals with stereotypic behavior, normative data (percentile ranks and T-scores) were derived. The data were presented in two tables, one showing a breakdown of gender by age groups, and the second one of age groups by level of functioning.

Effect of divalproex sodium on aggression and self-injurious behaviour in adults with intellectual disability: a retrospective review

The aim of the present study was to evaluate the efficacy of divalproex sodium treatment in adults with intellectual disability, and aggressive or self-injurious behaviour. Twenty-eight adults aged between 20 and 63 years of age with severe, long-lasting behavioural problems were treated with divalproex sodium (dosage 500-4000 mg day(-1)). Clinical changes were assessed at 2-73 months into the pharmacological treatment utilizing the Clinical Global Impression Severity (CGI-S) scale, and monthly behavioural counts of aggressive and self-injurious acts. Seventy-one percent of subjects demonstrated a moderate or marked improvement on the CGI-S; another 21% demonstrated mild benefits. Among the patients for whom objective prospective behavioural counts were available, 88% showed a significant reduction in aggression and self-injurious behaviour, 46% had other psychotropic medications discontinued, and another 39% had psychotropic medications decreased. One patient had serious thrombocytopenia which required the discontinuation of divalproex sodium, and one other had vomiting and worsened aggression. The present preliminary, uncontrolled study suggests that adults with intellectual disability, and aggressive or self-injurious behaviour may respond to divalproex sodium, and that this drug is well-tolerated in the majority of subjects.

Measuring problem behaviors in children with mental retardation: dimensions and predictors

Scores from the Child Behavior Checklist (CBCL; Achenbach, 1991a) and the Client Development Evaluation Report (CDER; California Department of Developmental Services, 1980) for 67 children and adolescents with mental retardation were examined to evaluate the factorial validity of the instruments. Four factor analyses were conducted. The initial factor analysis of CBCL data failed to confirm the presence of the five first-order factors previously reported for the CBCL standardization sample (Achenbach, 1991b). Second, the higher-order factors of Externalizing and Internalizing behaviors, similar to the structure reported for the CBCL standardization sample (Achenbach, 1991b), were confirmed on the present sample. Third, the two CDER factors of Personal Maladaption and Social Maladaption, previously identified by Widaman, Gibbs, and Geary (1987), were also confirmed. Finally, a higher-order factor analysis of the two factor scores from the CBCL and two factor scores from the CDER was conducted to study the congruence between the CBCL Externalizing and CDER Social Maladaption dimensions, and between the CBCL Internalizing and CDER Personal Maladaption factors. Moderate levels of congruence were found. Next, child characteristics, including level of mental retardation, age, and four dimensions of adaptive behavior, were used as predictors of problem behavior. No child characteristics were significantly related to the CBCL Externalizing dimension, but child age and level of mental retardation were significant predictors of the CBCL Internalizing dimension. CDER Cognitive Competence predicted CDER Social Maladaption, and child age predicted CDER Personal Maladaption. The findings are discussed in relation to previous studies of problem behaviors of children and adolescents with mental retardation.

A clinical approach to the pharmacotherapy of aggression in children and adolescents

Overt aggression in its various forms is the most prevalent symptom presenting to pediatric mental health providers, regardless of setting. It is a behavior with a heterogeneous etiology and requires a comprehensive approach to evaluation and treatment. Evaluation of the aggressive child must assess medical, neurologic, psychiatric, psychosocial, familial, and/or educational contributions to behavioral dyscontrol. Multimodal treatment is generally required. At present, there is no single medication to recommend for the treatment of aggressive behavior. Multiple medications have clinically been used in a nonspecific fashion to target excessive childhood aggression. Although successful for some, this approach increases risk for ineffective interventions accompanied by side effects. Until a scientific understanding of the developmental neurobiology of aggression leads to more specific treatment, this review suggests the use of a diagnostic-based approach to the pharmacology of aggression (FIG. 1). Descriptive diagnostic techniques should be used to define the presence of any primary or comorbid psychiatric disorder that presents with aggression as an associated symptom. Treating aggression in the context of these psychiatric syndromes appears to be the most direct approach. Aggression occurring in the context of a medication-responsive psychiatric diagnosis appears most sensitive to pharmacologic intervention. Presently, evidence for efficacy is strongest for aggression in the context of ADHD, psychotic disorder, adolescent-onset bipolar disorder, and ictal aggression It remains less clear that medication can help aggression when it occurs independently of a pharmacologically treatable comorbid psychiatric disorder. Aggression may respond to a target symptom approach where discrete behavioral symptoms that contribute to aggression, such as irritability, explosiveness, fear, or impulsivity, may be modified by medication intervention (FIG. 1). When treatment is approached in this fashion, it is standard practice to use the least toxic and safest intervention first. Behavioral treatment based on contingency management principles could be initially recommended. Medication trials should first use medications that have demonstrated empiric efficacy in reducing aggression (TABLE 1) and that have a favorable safety profile. Neuroleptics to treat aggression in nonpsychotic psychiatrically referred youth should be kept to a minimum, secondary to their significant adverse risk profile. Alternative medications, such as selective serotonin reuptake-inhibiting antidepressants, buspirone, lithium, anticonvulsants, opiate blocking agents, propranolol, nadolol, and clonidine, deserve more clinical research in pediatric aggression. These medications may offer effective and less toxic alternatives in the pharmacologic treatment of inappropriate excessive childhood aggression.

Psychopharmacology in child and adolescent psychiatry: a review of the past seven years. Part I

OBJECTIVE

To present a critical overview of the literature published in the past 7 years on the efficacy and safety of psychoactive agents in mental retardation with associated psychiatric disorders, autistic disorder, Tourett's disorder, and attention-deficit/hyperactivity disorder.

METHOD

Double-blind and placebo-controlled clinical trials and open studies were reviewed and selected reports presented.

RESULTS

The literature review reveals that progress has been made in the psychopharmacological treatment of the above conditions. This is partly because more studies use larger sample sizes and a narrower age range of diagnostically homogeneous patients and use a more sophisticated methodology than in previous years. Greater attention is being paid to a critical assessment of psychoactive agents and to their safety, to the efficacy as well as to the effectiveness of drugs. The 5-year National Plan for Research on Child and Adolescent Mental Disorders (1991) based on the Institute of Medicine Report (1989) already has had a significant impact on psychophamacology research.

CONCLUSIONS

Advances in methodology, initiatives of the National Institute of Mental Health, and the advent of DSM-IV should continue to enhance research and improve pharmacotherapy in clinical practice.