Practical guidelines for the use of new generation antipsychotic drugs (except clozapine) in adult individuals with intellectual disabilities

Management of psychotropic medications in adults with intellectual disability: a scoping review

BACKGROUND/OBJECTIVE(S)

Psychotropic medications are commonly prescribed among adults with intellectual disability, often in the absence of a psychiatric diagnosis. The aim of this scoping review is to provide an overview of the extent, range, and nature of the available research on medication use and practices and medication management in people with intellectual disability taking psychotropic medications for behaviours that challenge.

MATERIALS AND METHODS

A scoping review of research studies (qualitative, quantitative, and mixed design) and Grey Literature (English) was carried out. Databases included: Ovid MEDLINE, Embase, CINAHL, JBI Evidence Synthesis, Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, PsycINFO, and Scopus. A three-step search strategy was followed, with results screened by two independent reviewers. Data was extracted independently by two reviewers using a data extraction tool with results mapped and presented using a narrative form supported by tables and diagrams to the research questions.

RESULTS

Following the removal of duplicates, records were screened, full texts assessed, and 49 studies were included. Medication outcomes included reduced repetitive, stereotypic, and/or aggressive behaviours. High dosing/prescribing in the setting of an absent/unclear clinical indication was associated with worsening of symptoms for which psychotropics were prescribed. While psychotropics had a role in managing behaviours that challenge, reducing or discontinuing psychotropics is sometimes warranted. Study designs were frequently pragmatic resulting in small sample sizes and heterogeneous cohorts receiving different doses and combinations of medications. Access to multidisciplinary teams, guidelines, medication reviews, staff training, and enhanced roles for carers in decision-making were warranted to optimize psychotropic use.

CONCLUSIONS

These findings can inform prescribing interventions and highlight the need for timely and comprehensive patient outcome data, especially on long-term use of high doses of psychotropics and what happens when reduce or stop prescribing these doses.KEY MESSAGESPsychotropic medications are frequently prescribed for people with intellectual disabilities, often at high doses and these medications are associated with both positive and negative patient outcomes.Work to rationalize psychotropic use has been reported with interventions aiming to reduce polypharmacy or deprescribe a single psychotropic medicine. These interventions had mixed success and risk of relapse was documented in some studies.Limitations in sample size and heterogenous patient cohorts make it challenging to understand the risks and benefits associated with reducing or stopping psychotropic medicines.Patient, carer, and clinician partnerships are critical to advance medication management.

Management of psychotropic medications in adults with intellectual disability: a scoping review protocol

Introduction: Psychotropic medications are commonly prescribed among adults with intellectual disability (ID), often in the absence of a psychiatric diagnosis. As such, there is great disparity between the estimated prevalence of mental illness and the rates of psychotropic medication use amongst people with ID. ‘Off-label’ use of these medications may account for much of this discrepancy, in particular their use in the management of challenging behaviour. This has come under scrutiny due to the myriad of side effects and the deficiency of high-quality data supporting their use for this indication. Understanding the causes and justifications for such disparity is essential in discerning the efficacy of current prescription practice.

Objective: To explore the existing evidence base regarding the prescription and management of psychotropic medications in adults with ID. The aim will be achieved through identifying the psychotropic medications commonly prescribed, the underlying rationale(s) for their prescription and the evidence available that demonstrates their appropriateness and effectiveness. Additionally, the paper will seek to evaluate the availability of any existing guidance that informs the management of these medications, and the evidence and outcomes of psychotropic medication dose reduction and/or cessation interventions.

Inclusion criteria: This review will consider studies that focus on the use of psychotropic medications amongst patients with ID.

Methods: Research studies (qualitative, quantitative and mixed design) and Grey Literature (English) will be included. The search will be conducted without time restrictions. Databases will include: Ovid MEDLINE, Embase, CINAHL, JBI Evidence Synthesis, Cochrane Central Register of Controlled Trials, Cochrane Databased of Systematic Reviews, PsycINFO and Scopus. A three-step search strategy will be followed, with results screened by two independent reviewers. Data will be extracted independently by two reviewers using a data extraction tool with results mapped and presented using a narrative form supported by tables and diagrams.

Management of psychotropic medications in adults with intellectual disability: a scoping review protocol

Introduction: Psychotropic medications are commonly prescribed among adults with intellectual disability (ID), often in the absence of a psychiatric diagnosis. As such, there is great disparity between the estimated prevalence of mental illness and the rates of psychotropic medication use amongst people with ID. 'Off-label' use of these medications may account for much of this discrepancy, in particular their use in the management of challenging behaviour. This has come under scrutiny due to the myriad of side effects and the deficiency of high-quality data supporting their use for this indication. Understanding the causes and justifications for such disparity is essential in discerning the efficacy of current prescription practice. Objective: To explore the existing evidence base regarding the prescription and management of psychotropic medications in adults with ID. The aim will be achieved through identifying the psychotropic medications commonly prescribed, the underlying rationale(s) for their prescription and the evidence available that demonstrates their appropriateness and effectiveness. Additionally, the paper will seek to evaluate the availability of any existing guidance that informs the management of these medications, and the evidence and outcomes of psychotropic medication dose reduction and/or cessation interventions. Inclusion criteria: This review will consider studies that focus on the use of psychotropic medications amongst patients with ID. Methods: Research studies (qualitative, quantitative and mixed design) and Grey Literature (English) will be included. The search will be conducted without time restrictions. Databases will include: Ovid MEDLINE, Embase, CINAHL, JBI Evidence Synthesis, Cochrane Central Register of Controlled Trials, Cochrane Databased of Systematic Reviews, PsycINFO and Scopus. A three-step search strategy will be followed, with results screened by two independent reviewers. Data will be extracted independently by two reviewers using a data extraction tool with results mapped and presented using a narrative form supported by tables and diagrams.

Prevalence of co-occurring psychiatric disorders in adults and adolescents with intellectual disability: A systematic review and meta-analysis

BACKGROUND

Subjects with intellectual disability (ID) are vulnerable to experience psychiatric disorders. The present authors performed a systematic review and meta-analysis to estimate the prevalence of co-occurring psychiatric disorders, excluding co-occurring autism spectrum disorders, in subjects with intellectual disability.

METHOD

The present authors performed a random-effects meta-analysis of the prevalence of psychiatric disorders in adults and adolescents with intellectual disability.

RESULTS

Twenty-two studies were included. The pooled prevalence of any co-occurring psychiatric disorders in intellectual disability was 33.6% (95% CI: 25.2%-43.1%) with high heterogeneity but no publication bias. Prevalence was lower in population-based studies, in studies that used ICD criteria for the psychopathology and in studies with low risk of bias. The prevalence was higher in mild, moderate and severe intellectual disability than in profound intellectual disability.

CONCLUSIONS

Psychiatric disorders are common in subjects with intellectual disability, and the present authors found that clinical and methodological moderators affect the pooled prevalence.

Support staff's perceptions of discontinuing antipsychotics in people with intellectual disabilities in residential care: A mixed-method study

BACKGROUND

Although there is little evidence on their efficacy regarding challenging behaviour, antipsychotics are the most used psychotropic drugs in residential intellectually disabled people. Discontinuation is possible for some residential clients with intellectual disabilities. This study aimed to gain insight into support staff's perceptions of discontinuing antipsychotics in residential clients with intellectual disabilities.

METHOD

Four focus groups were conducted in this mixed-methods study, followed by a survey.

RESULTS

A large majority of support staff perceive antipsychotics to be effective in controlling challenging behaviour. Support staff regarded themselves as willing to contribute to the discontinuation of antipsychotics, but were more confident about achieving reductions.

CONCLUSIONS

The attitude of the majority of support staff towards discontinuation provides a good basis for regularly reviewing antipsychotics use. A reduction plan should include preliminary steps, methods of monitoring and evaluating the process, and establishing measures for dealing with possible crises.

Psychotropic medication and psychotherapeutic treatment of adults with intellectual disabilities (PROMPT-ID): a cross-sectional, epidemiological study in Saxony, Germany

INTRODUCTION

The psychotropic medication and psychotherapeutic treatment of adults with intellectual disabilities study is a cross-sectional, epidemiological study carried out in Saxony, Germany. The main aim of the study is, among others, to assess the prevalence and quality of psychotropic medication in adults with ID.

METHODS

Inclusion criteria are mild to profound forms of ID and an age of 18 years or older. A representative sample is realised by a two-stage sampling procedure. Study participants will be recruited from sheltered workshops (SW) and sheltered housings (SH). The stratified cluster sampling is realised by a random selection of service providing institutions followed by a random selection of adults with ID. An estimated total number of n=200 study participants via SW and n=400 via SH will be contacted to obtain data of approximately n=131 study participants recruited through SW and n=232 participants through SH. Thus, based on a psychotropic medication prevalence of 30%, an estimated number of n=109 in-depth interviews about psychotropic prescription practice will be carried out. Data collection is realised through interviews with key carers in the living environment. If psychotropics are prescribed currently, basic information (eg, dosage, treatment duration) are obtained, and a newly developed interview targeting the quality of the psychotropic medication treatment is conducted both with the carers and with the prescribing physicians. In addition to the prevalence and quality of psychotropic treatment, other parameters (eg, mental healthcare utilisation, psychiatric symptomatology, problem behaviour, institutional factors and parameters of the provision area) are assessed using well-established instruments.

ETHICS AND DISSEMINATION

Approval of the responsible ethics committee was obtained. Findings will be disseminated to participating institutions, published in journals and conferences and fill the lack of representative data that is urgently needed in this often criticised health service area. They shall help to improve mental health services in adults with ID prospectively.

TRIAL REGISTRATION NUMBER

NCT03558815; Pre-results.

Recognition and treatment of mood dysregulation in adults with intellectual disability

Mood dysregulation is a common feature in the psychopathology of people with intellectual disability (ID) and co-occurring behavioral/psychiatric disorders. It can present with a host of dangerous behaviors, including aggression, self-injury, and property damage. There are special techniques that are used to assess these behaviors in people with ID, that can eventually inform an appropriate approach to pharmacologic and nonpharmacologic treatment. Two case studies are presented that illustrate the elements in the assessment and treatment of mood dysregulation in ID.

High Doses of Drugs Extensively Metabolized by CYP3A4 Were Needed to Reach Therapeutic Concentrations in Two Patients Taking Inducers

INTRODUCTION

In the last 20 years of clinical practice, the senior author has identified these 2 rare cases in which the patients needed extremely high doses of drugs metabolized by CYP3A4 to reach and maintain serum therapeutic concentrations.

METHODS

The high metabolic ability of these 2 patients was demonstrated by the low concentration-to-dose ratios (C/D ratios) of several drugs metabolized by CYP3A4.

RESULTS

Case 1 was characterized by a history of high carbamazepine doses (up to 2,000mg/day) and needed 170 mg/day of diazepam in 2 days to cooperate with dental cleaning. The high activity of the CYP3A4 isoenzyme was manifested by fast metabolism for quetiapine and diazepam, which took more than 1 year to normalize after the inducer, phenytoin, was stopped. Case 2 was also very sensitive to CYP3A4 inducers as indicated by very low C/D ratios for carbamazepine, risperidone and paliperidone. The carbamazepine (2,800 mg/day) and risperidone (20 mg/day) dosages for this second patient are the highest doses ever seen for these drugs by the senior author. Risperidone induction appeared to last for many months and metabolism was definitively normal 3 years after stopping carbamazepine. On the other hand, olanzapine C/D ratios were normal for induction.

CONCLUSIONS

The literature has never described similar cases of very high doses of drugs metabolized by CYP3A4. We speculate that these 2 patients may have unusual genetic profiles at the nuclear receptor levels; these receptors regulate induction of drugs.

Non-pharmacological interventions for adults with intellectual disabilities and depression: a systematic review

BACKGROUND

Although high rates of depression symptoms are reported in adults with intellectual disabilities (IDs), there is a lack of knowledge about non-pharmacological treatment options for depression in this population. The first research question of this paper is: Which non-pharmacological interventions have been studied in adults with ID and depression? The second research question is: What were the results of these non-pharmacological interventions?

METHOD

Systematic review of the literature with an electronic search in six databases has been completed with hand searches. Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines have been followed. Selected studies met predefined inclusion criteria.

RESULTS

Literature search resulted in 4267 papers of which 15 met the inclusion criteria. Five different types of non-pharmacological interventions have been studied: cognitive behavioural therapy, behavioural therapy, exercise intervention, social problem-solving skills programme and bright light therapy.

CONCLUSION

There are only a few studies of good quality evaluating non-pharmacological interventions for adults with ID and depression. Some of these studies, especially studies on cognitive behavioural therapy, show good results in decreasing depressive symptoms. High-quality randomised controlled trials evaluating non-pharmacological interventions with follow-up are needed.

A pilot randomised controlled trial of community-led ANtipsychotic Drug REduction for Adults with Learning Disabilities

BACKGROUND

Data suggest that approximately 50,000 adults with learning disabilities (LDs) in England and Wales are currently prescribed antipsychotic medication. Illness in this population is common, including significant rates of challenging behaviour and mental illness, but there is particular concern over the use of antipsychotics prescribed for reasons other than the treatment of psychosis. Control of challenging behaviour is the primary reason why such medications are prescribed despite the absence of good evidence for any therapeutic effect for this purpose.

OBJECTIVES

To assess the feasibility of recruitment and retention and to explore non-efficacy-based barriers to a blinded antipsychotic medication withdrawal programme for adults with LDs without psychosis compared with treatment as usual. A secondary objective was to compare trial arms regarding clinical outcomes.

DESIGN

A two-arm individually randomised double-blind placebo-controlled drug reduction trial.

SETTING

Recruitment was through community learning disability teams (CLDTs) in south Wales and south-west England.

PARTICIPANTS

Adults with LDs who are prescribed risperidone for treatment of challenging behaviour with no known current psychosis or previous recurrence of psychosis following prior drug reduction.

INTERVENTION

A double-blind drug reduction programme leading to full withdrawal within 6 months. Treatment in the intervention group was gradually reduced over a 6-month period and then maintained at the same level for a further 3 months, still under blind conditions. In the control group, the baseline level of medication was maintained throughout the 9-month period. The blind was broken at 9 months, following final data collection.

MAIN OUTCOME MEASURES

Feasibility outcomes were (1) the number and proportion of general practices/CLDTs that progressed from initial approach to recruitment of participants and (2) the number and proportion of recruited participants who progressed through the various stages of the study. Trial arms were also compared regarding clinical outcomes, the Modified Overt Aggression Scale, the Aberrant Behaviour Checklist, the Psychiatric Assessment Schedule for Adults with Developmental Disability checklist, the Antipsychotic Side-effect Checklist, the Dyskinesia Identification System Condensed User Scale, the Client Service Receipt Inventory, use of other interventions to manage challenging behaviour, use of as-required (pro re nata) medication and level of psychotropic medication use.

RESULTS

Of the 22 participants randomised (intervention, n = 11; control, n = 11), 13 (59%) achieved progression through all four stages of reduction. Follow-up data at 6 and 9 months were obtained for 17 participants (intervention, n = 10; and control, n = 7; 77% of those randomised). There were no clinically important changes in participants' levels of aggression or challenging behaviour at the end of the study. There were no expedited safety reports. Four adverse events and one serious adverse event were reported during the trial.

LIMITATIONS

Recruitment was challenging, which was largely a result of difficulty in identifying appropriate persons to consent and carer concerns regarding re-emergence of challenging behaviour. Reduced recruitment meant that the full trial became an exploratory pilot study.

CONCLUSIONS

The results indicate that drug reduction is possible and safe. However, concerns about taking part were probably exacerbated by limited availability of alternative (behavioural) interventions to manage behaviour; therefore, focused support and alternative interventions are required. The results of the qualitative study provide important insights into the experiences of people taking part in drug reduction studies that should influence future trial development.

FUTURE WORK

We recommend that further work focuses on support for practitioners, carers and patients in reducing antipsychotic medication.

TRIAL REGISTRATION

Current Controlled Trials ISRCTN38126962.

FUNDING

This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 21, No. 47. See the NIHR Journals Library website for further project information.

Reduction or discontinuation of antipsychotics for challenging behaviour in adults with intellectual disability: a systematic review

The use of antipsychotics to manage challenging behaviour in adults with intellectual disability is widespread but controversial, and evidence is scarce. There is a perception that antipsychotics used in this context can be reduced or discontinued, and this has been a major focus of recent national policy. However, such an intervention risks harm as well as having potential benefits. We reviewed the available evidence and found that antipsychotics can be reduced or discontinued in a substantial proportion of adults who use them for challenging behaviour, although not always without adverse effects. There is a group which displays behavioural deterioration on antipsychotic reduction that prevents discontinuation; predictors of poor response could not be reliably identified. In view of the relatively scarce data and methodological limitations of the available studies, we cannot draw firm conclusions to inform a population level approach to this issue. Antipsychotic medication used for behaviour should be reviewed regularly and an individualised approach taken to treatment.

Psychopharmacology of Persistent Violence and Aggression

Persistent violence not due to acute psychosis or mania can be managed only after appropriate characterization of the aggressive episodes (psychotic, impulsive, or predatory/planned/instrumental). The type of violence combined with the psychiatric diagnosis dictates the evidence-based pharmacologic approaches for psychotically motivated and impulsive aggression, whereas instrumental violence mandates forensic/behavioral strategies. For nonacute inpatients, schizophrenia spectrum disorders, traumatic brain injury, and dementia comprise the majority of individuals who are persistently aggressive, with impulsive actions the most common form of violence across all diagnoses. Neurobiological considerations combined with empirical data provide a comprehensive framework for systematic medication trials to manage persistently aggressive patients.

Pharmacological management of behavioral and psychiatric symptoms in older adults with intellectual disability

Given medical and social advances, the life expectancy of individuals with intellectual disability (ID) has increased dramatically, leading to a generation of older individuals with such disabilities. This review focuses on the pharmacological treatment of behavioral and psychiatric symptoms and disorders in older adults with ID. Older adults with ID often present with medical co-morbidities and mental health issues. Medication management of behavioral and psychiatric problems is complicated by a higher risk for adverse events, lack of decision-making capacity, and complex care networks. Some studies have shown that individuals with ID and co-morbid mental disorders are undertreated in comparison with those with similar disorders in the general population, resulting in poorer outcomes. However, older adults with ID are also at risk of polypharmacy, and older age is a risk factor for development of side effects. A general principle is that medication treatment for psychiatric disorders in older individuals with ID should be started at low dosages and increased cautiously while monitoring response and side effects. The use of psychotropic drugs for older individuals with ID and behavioral problems remains controversial, particularly in those with dementia.

Consensus guideline for therapeutic drug monitoring in psychiatry (2004): Bibliometric analysis of citations for the period 2004-2011

OBJECTIVE

To evaluate the awareness of guidelines for the therapeutic monitoring (TDM) of neuropsychiatric drugs by the scientific community, a bibliometric analysis was carried out.

METHODS

Citations of a guideline for TDM of psychotropic drugs from the Arbeitsgemeinschaft für Neuropsychopharmakologie und Pharmakopsychiatrie (AGNP-TDM) were compared with those of a guideline for TDM of antiepileptic drugs from the International League Against Epilepsy (ILAE-TDM), published in Pharmacopsychiatry in 2004 and in Epilepsia in 2008, respectively. Citations for the period 2004-2011 were obtained from the Web of Science database (31 December 2012). The study included an analysis of the geographical distribution of the first authors and of the cited journals. Citing articles were classified according to five categories and 10 subcategories.

RESULTS

The AGNP-TDM and the ILAE-TDM were cited 214 and 67 times, respectively. For the AGNP-TDM, written by 14 authors from German speaking countries, the number of self-citations was 83 (39%). Most citations were found in the following categories: reviews in clinical pharmacology (85 times), clinical pharmacological studies in patients (49). Four out of the 74 different AGNP-TDM citing journals displayed 41% of the citations. The ILAE-TDM was published by five European authors and four authors from the USA. Europe (40) and North America (15) had the highest citation rates. For both guidelines, reviews in clinical pharmacology had the highest percentage of citations, 40% for the AGNP-TDM and 49% for the ILAE-TDM.

CONCLUSION

The observations obtained in this pilot study allowed an analysis of the visibility of two expert guidelines by the scientific community.

Prevalence and incidence of myocardial infarction and cerebrovascular accident in ageing persons with intellectual disability

BACKGROUND

Epidemiological information on age-related cardiovascular disease in people with intellectual disability (ID) is scarce and inconclusive. We compared prevalence and incidence of cerebrovascular accident and myocardial infarction over age 50 in a residential population with ID to that in a general practice population.

METHOD

A retrospective descriptive study was conducted, based on medical records of 510 persons with ID and 823 general practice patients, aged 50 years and over.

RESULTS

Lifetime prevalences after age 50 were similar in both populations: 5.7% (95% CI 4.0-8.1%) in persons with ID and 4.4% (95% CI 3.1-6.0%) in the general population (Pearson chi-square 1.17, P = 0.279). Incidence per gender was similar between cohorts (men P = 0.86, women P = 0.36). There was no difference in incidence rates between the ID and control groups [relative risk = 1.5 (95% CI 0.9-2.4)].

CONCLUSION

Prevalence and incidence of myocardial infarction and cerebrovascular accident in ageing persons with ID do not appear different from those in the general population. It has to be taken into account that underdiagnosis and selection bias towards a more disabled group may have lead to underestimation of age-related cardiovascular morbidity, and the higher age and underrepresentation of Down syndrome to overestimation.

Pharmacotherapy of disruptive behavior in mentally retarded subjects: A review of the current literature

The review presented here describes the state of the art of pharmacological treatment of aggression in subjects with mental retardation (MR) summing up results for both, children and adults. In general, psychopharmacological treatment of disruptive behavior in individuals with MR is similar to the treatment in subjects without MR. Compared to individuals without MR medication should "start lower and go slower." For children and adults results were similar but were obtained by somewhat different medications. There is evidence for the conventional antipsychotic zuclopenthixol having positive effects on disruptive behavior. Most studies described the atypical antipsychotic risperidone to control severe self-injurious behavior and other behavior problems in a variety of diagnoses. Anticonvulsants, antidepressants, and anxiolytic medications are reported as effective as well for the treatment of individuals with disruptive behavior. Aggression-related behavior often gets treated with stimulants or with stimulants combined with atypical neuroleptics.

What is the evidence for environmental causes of challenging behaviors in persons with intellectual disabilities and autism spectrum disorders?

An extensive literature on the causes of challenging behaviors has been developed, primarily in the applied behavior analysis literature. One hundred and seventy-three empirical studies were reviewed where functional assessment serves as the primary method of identifying these causes. Most of the studies were able to identify a clear function or functions. Most commonly established causes were attention, the efforts to acquire tangibles, negative reinforcement in the form of escape from tasks or environments, and sensory stimulation, also described as an alone condition. Examples are provided regarding how these conditions are investigated across studies. Biological and cognitive causes have also been demonstrated. However, to date the empirical literature is limited with the bulk of studies being correlational. Considerably more research is needed, but some causes and methods to identify them are beginning to emerge.

An Examination of Psychotropic Medication Side Effects: does taking a greater number of psychotropic medications from different classes affect presentation of side effects in adults with ID?

This study examined whether the number of psychotropic medications an individual is taking across classes influences side effects among adults with Intellectual Disability (ID). Participants were 80 adults diagnosed with ID. Dependent variables were the composite score and domain scores of the Matson Evaluation of Drug Side-effects (MEDS), which is an instrument used to assess side effects. There were three levels of the independent variable: Group 1--those taking zero psychotropic medications, Group 2--those taking one psychotropic medication, and Group 3--those taking two psychotropic medications across different medication classes. There was a significant main effect regarding number of psychotropic medication classes prescribed. Further analysis revealed that four of the nine MEDS domains had significantly different mean scores for number of psychotropic medication classes. For the majority of MEDS domains, such as Central Nervous System-General, Parkinsonism/Dyskinesia, and Behavioral/Akathesia domains, participants in the no psychotropic medication group had significantly lower mean scores than those in the one and two psychotropic medication groups. Only two MEDS domains, Cardiovascular and Hematologic Effects as well as Skin, Allergies, and Temperature, were significantly different between participants taking one psychotropic medication as compared with two psychotropic medications from different classes. Implications of these findings and recommendations for future research are discussed.

The use of clozapine among individuals with intellectual disability: a review

Clozapine has been approved in the United States since 1990 for refractory or treatment resistant schizophrenia in the general population. However, as with many other antipsychotic medications, it is being prescribed for reasons other than those indicated. Among individuals with intellectual disabilities, clozapine is increasingly being prescribed to treat behavioral problems, although the empirical evidence for such a practice is lacking. This review was undertaken as an attempt to summarize the available studies regarding the use of clozapine for behavioral purposes among individuals with intellectual disabilities. Findings of our review suggest that the effectiveness of clozapine in targeting challenging behaviors among individuals with intellectual disabilities is relatively inconclusive at present. We discuss reasons why these limitations exist and offer some solutions to help alleviate these limitations.

Antipsychotic drug side effects for persons with intellectual disability

Antipsychotic drugs are the most frequently prescribed of the psychotropic drugs among the intellectually disabled (ID) population. Given their widespread use, efforts to systematically assess and report side effects are warranted. Specific scaling methods such as the Matson Evaluation of Side Effects (MEDS), the Abnormal Inventory Movement Scale (AIMS), and Dyskinesia Identification System Condensed User Scale (DISCUS) are reviewed. Symptom patterns and a focus on additional research are discussed. While progress has been made, more and more systematic methods to research these problems are necessary.

The prevalence of temporomandibular disorder signs in people with mental retardation

The purpose of this study was to determine the prevalence of temporomandibular disorder (TMD) signs and tooth wear levels in a group of hospitalised patients with mental retardation (MR). A total of 118 patients with MR and 104 mentally healthy individuals (control) were included in this study. The groups consisted of equal numbers of male and female patients. TMD signs were evaluated according to the Research Diagnostic Criteria to assess the limitation in maximum mouth opening, the alterations in the mouth opening pathway and temporomandibular joint sounds. In addition, tooth wear was recorded. The frequency of at least one sign of TMD observed in patients with MR (79·7%) was significantly higher than in controls (69·2%) (P=0.03). In addition, 43.2% of the patients with MR had more than one sign of TMD compared with 28.8% of the control group (P = 0·02). Prevalence of each sign exhibited in the MR and control groups was as follows: limitation in mouth opening, 24·6% vs. 13·5% (P=0·02); deviation, 18·6% vs. 26·9% (P=0·001); deflection, 29·7% vs. 10·6% (P=0·001); TMJ sounds, 46·6% vs. 41·1% (P=0·43); bilateral joint sounds 28·8% vs. 16·3% (P=0·05) respectively. Prevalences of TMD signs were not different between genders in both groups (P>0·05). Severe tooth wear was evident in 43·2% of the patients with MR compared with 20·6% of the controls (P=0·001). In conclusion, patients with MR seem to be more prone to having TMD signs compared with the control population.

QTc interval in a sample of long-term schizophrenia inpatients

This naturalistic study attempted to determine the prevalence of prolonged QTc interval in a relatively large population of inpatients hospitalized with chronic schizophrenia, and to explore QTc relationship with demographic variables, metabolic parameters and prescribed treatments. All inpatients from a Spanish long-term psychiatric hospital were cross-sectionally investigated to determine the prevalence of QTc prolongation and metabolic syndrome. The sample with a DSM-IV diagnosis of schizophrenia included 171 Caucasian inpatients, all of Spanish origin. A prolonged QTc interval was defined as >450 ms in men and >470 ms in women. The relationships between QTc and other continuous variables were assessed using a linear regression model with QTc as the dependent variable. Only 10 patients (6%) had a prolonged QTc interval; one case was possibly explained by hypokalemia. Three patients (2%) had a QTc > 500 ms. Gender, old age (> or = 50 years old), current smoking, systolic blood pressure, HDL cholesterol and history of arrhythmia were found to have significant effects on QTc interval in a linear regression analysis. After controlling for significant variables, the mean QTc interval was not significantly influenced by antipsychotic dose, type of antipsychotic treatment, the use of depot antipsychotics, or the number of different antipsychotics prescribed. Our study focused on long-term schizophrenia inpatients with frequent antipsychotic polypharmacy and high antipsychotic doses, and suggested that after excluding the case with hypokalemia length of QTc was associated with history of arrhythmias and with metabolic factors, while the effects of antipsychotic compound or class were not so evident.