Employment profiles in neuromuscular diseases

Employment status of patients with Charcot-Marie-Tooth type 1A

Previous studies showed that being unemployed is associated with lower quality of life in patients with Charcot-Marie-Tooth type 1A (CMT1A). The aim of this study was to assess the differences between CMT1A patients capable of working and CMT1A patients incapable of working due to CMT1A. Forty-four patients with genetically confirmed CMT1A were included. Medical Research Council (MRC) Sum Score, Charcot-Marie-Tooth Neuropathy Score (CMTNS), CMT Examination Score (CMTES), Overall Neuropathy Limitations Scale (ONLS), Beck Depression Inventory (BDI), Krupp's Fatigue Severity Scale (FSS), and Falls Efficacy Score (FES) were used. Whole cohort was divided into two groups: 1. CMT1A patients capable of working (employed and unemployed not due to CMT) and 2. CMT1A patients incapable of working due to CMT1A (unemployed due to CMT and retired due to CMT). At time of testing, 38.6% patients were employed, 13.6% were unemployed due to CMT, 6.8% were unemployed but not due to CMT, and 40.9% were retired early due to disability caused by CMT. Patients retired due to CMT1A at the age of 43 ± 10 years. ONLS total score and physical work appeared as significant independent predictors of being incapable of working due to CMT1A. Patients incapable of working were almost four times more likely to have fatigue (OR = 3.7, 95% CI 1.0-13.1, p < 0.05) and 11 times more likely to have fear of falling (OR = 11.0, 95% CI 2.0-59.7, p < 0.01). Patients with more severe functional disability and physical type of job were most likely incapable of working due to CMT1A. Incapability of working was associated with fatigue and fear of falling.

Charcot-Marie-tooth disease causing mutation (p.R158H) in pyruvate dehydrogenase kinase 3 (PDK3) affects synaptic transmission, ATP production and causes neurodegeneration in a CMTX6 C. elegans model

Charcot–Marie-Tooth (CMT) is a commonly inherited, non-fatal neurodegenerative disorder that affects sensory and motor neurons in patients. More than 90 genes are known to cause axonal and demyelinating forms of CMT. The p.R158H mutation in the pyruvate dehydrogenase kinase 3 (PDK3) gene is the genetic cause for an X linked form of axonal CMT (CMTX6). In vitro studies using patient fibroblasts and iPSC-derived motor neurons have shown that this mutation causes deficits in energy metabolism and mitochondrial function. Animal models that recapitulate pathogenic in vivo events in patients are crucial for investigating mechanisms of axonal degeneration and developing therapies for CMT. We have developed a C. elegans model of CMTX6 by knocking-in the p.R158H mutation in pdhk-2, the ortholog of PDK3. In addition, we have developed animal models overexpressing the wild type and mutant form of human PDK3 specifically in the GABAergic motor neurons of C. elegans. CMTX6 mutants generated in this study exhibit synaptic transmission deficits, locomotion defects and show signs of progressive neurodegeneration. Furthermore, the CMTX6 in vivo models display energy deficits that recapitulate the phenotype observed in patient fibroblasts and iPSC-derived motor neurons. Our CMTX6 animals represent the first in vivo model for this form of CMT and have provided novel insights into the cellular function and metabolic pathways perturbed by the p.R158H mutation, all the while closely replicating the clinical presentation observed in CMTX6 patients.

Adult North Star Network (ANSN): Consensus Guideline For The Standard Of Care Of Adults With Duchenne Muscular Dystrophy

There are growing numbers of adults with Duchenne Muscular Dystrophy living well into their fourth decade. These patients have complex medical needs that to date have not been addressed in the International standards of care. We sought to create a consensus based standard of care through a series of multi-disciplinary workshops with specialists from a wide range of clinical areas: Neurology, Cardiology, Respiratory Medicine, Gastroenterology, Endocrinology, Palliative Care Medicine, Rehabilitation, Renal, Anaesthetics and Clinical Psychology. Detailed reports of evidence reviewed and the consensus building process were produced following each workshop and condensed into this final document which was approved by all members of the Adult North Star Network including service users. The aim of this document is to provide a framework to improve clinical services and multi-disciplinary care for adults living with Duchenne Muscular Dystrophy.

Evidence-Based Secondary Transition Predictors for Physical Therapists Working With High School Students

PURPOSE

Individuals with disabilities experience poorer postschool outcomes compared with their peers without disabilities. Youth with orthopedic or physical disabilities experience challenges during transition particularly in the areas of education and employment. Physical therapists should continue to become more involved in transition planning and providing services for transition-age students with physical disabilities. The purpose of this article is to clarify the role of physical therapists who work with students who have disabilities, as they transition from high school to postsecondary roles as well as provide the current evidence-based predictors of postschool success and recommended practices to school-based physical therapists who work with these students.

SUMMARY OF KEY POINTS

Evidence-based instructional practices for secondary students with disabilities and identified in-school predictors of postschool success for students with disabilities are aligned with effective practices for physical therapists. Additionally, suggestions for involving physical therapists in transition planning and increasing collaboration in providing transition services for students with disabilities are provided.

STATEMENT OF CONCLUSIONS

Physical therapists can provide critical expertise for many individuals with disabilities; however, they are not always included effectively in transition planning and services for students with disabilities.

RECOMMENDATIONS FOR CLINICAL PRACTICE

Recommendations for practice include ways to involve physical therapists in transition planning and services and increasing collaboration between teachers, physical therapists, and other members of the Individualized Education Program team to provide effective, comprehensive transition services.

Energy metabolism and mitochondrial defects in X-linked Charcot-Marie-Tooth (CMTX6) iPSC-derived motor neurons with the p.R158H PDK3 mutation

Charcot-Marie-Tooth (CMT) is a group of inherited diseases clinically and genetically heterogenous, characterised by length dependent degeneration of axons of the peripheral nervous system. A missense mutation (p.R158H) in the pyruvate dehydrogenase kinase 3 gene (PDK3) has been identified as the genetic cause for an X-linked form of CMT (CMTX6) in two unrelated families. PDK3 is one of four PDK isoenzymes that regulate the activity of the pyruvate dehydrogenase complex (PDC). The balance between kinases (PDKs) and phosphatases (PDPs) determines the extend of oxidative decarboxylation of pyruvate to generate acetyl CoA, critically linking glycolysis and the energy producing Krebs cycle. We had shown the p.R158H mutation causes hyperactivity of PDK3 and CMTX6 fibroblasts show hyperphosphorylation of PDC, leading to reduced PDC activity and ATP production. In this manuscript we have generated induced pluripotent stem cells (iPSCs) by re-programming CMTX6 fibroblasts (iPSC^CMTX6). We also have engineered an isogenic control (iPSC^isogenic) and demonstrated that genetic correction of the p.R158H mutation reverses the CMTX6 phenotype. Patient-derived motor neurons (MN^CMTX6) show increased phosphorylation of the PDC, energy metabolism defects and mitochondrial abnormalities, including reduced velocity of trafficking mitochondria in the affected axons. Treatment of the MN^CMTX6 with a PDK inhibitor reverses PDC hyperphosphorylation and the associated functional deficits founds in the patient motor neurons, demonstrating that the MN^CMTX6 and MN^isogenic motor neurons provide an excellent neuronal system for compound screening approaches to identify drugs for the treatment of CMTX6.

Instruments for the Assessment of Behavioral and Psychosocial Functioning in Duchenne and Becker Muscular Dystrophy; a Systematic Review of the Literature

Objective

This systematic review aims to provide an overview of instruments used to assess behavioral and psychosocial functioning of patients with Duchenne and Becker muscular dystrophy, as well as to review the psychometric properties and applicability of these instruments.

Methods

Five databases (Embase, Psyc.info, ERIC, Pubmed/Medline, and Cochrane) were searched from inception to June, 2018. Potential articles were rated by two independent reviewers. A predefined PROSPERO form (CRD42017074518) was used to extract data from included articles.

Results

Sixty-one instruments were used in 54 studies. The Child Behavior Checklist is commonly used, but it lacks disease specific psychometric information. Sixteen instruments that contained disease specific psychometric information were included for final evaluation. The results displayed three instruments that are potentially valid for screening of psychosocial problems: The Psychosocial Adjustment and Role Skills Scale 3rd edition, the Pediatric Quality of Life Inventory Generic module, and the Life Satisfaction Index for Adolescents with Duchenne muscular dystrophy. Appropriate instruments for screening of behavioral problems may be: the Strengths and Difficulties Questionnaire, the Generalized Anxiety Disorder-7 item questionnaire, and the Patient Health Questionnaire-9 item questionnaire.

Conclusions

Further research on psychometric properties of screening instruments is crucial to ascertain a gold standard for clinical and research purposes. Meanwhile, for definite diagnostics purposes we recommend a multimethod, multisource, multisetting assessment in this high-risk population.

Patient-Reported Symptoms in Facioscapulohumeral Muscular Dystrophy (PRISM-FSHD)

OBJECTIVE

To determine the frequency and relative importance of the most meaningful symptoms in facioscapulohumeral muscular dystrophy (FSHD) and to identify the demographic and clinical features that are associated with the greatest disease burden in this population.

METHODS

We performed a cross-sectional study involving 328 participants with FSHD. Collectively, participants reported the prevalence and relative importance of 274 symptoms and 15 symptomatic themes. We assessed the association between symptomatic theme prevalence and participants' age, sex, disease duration, pain level, employment status, and education.

RESULTS

Participants answered >48,000 questions regarding their disease burden. The symptomatic themes with the highest prevalence in our sample were problems with shoulders or arms (96.9%), limitations with activities (94.7%), core weakness (93.8%), fatigue (93.8%), limitations with mobility and walking (93.6%), changed body image due to the disease (91.6%), and pain (87.7%). Problems with shoulders and arms and limitations with mobility and walking had the greatest effect on participants' lives. Employment status and the report of pain had the most extensive association with the prevalence of symptoms, with employment being associated with 8 of 15 of the symptomatic themes and pain being associated with 7 of 15 of the symptomatic themes. Men and women with FSHD experienced a similar prevalence of all symptomatic themes.

CONCLUSIONS

Adults with FSHD experience a variety of symptoms that play an important role in their disease burden. These symptoms have a variable prevalence and importance in the FSHD population and are associated with disease duration, employment status, and pain level.

Meaningful occupations of young adults with muscular dystrophy and other neuromuscular disorders

BACKGROUND.

Youth with Duchenne muscular dystrophy (DMD) and other neuromuscular disorders are living well into adulthood and often need help engaging in meaningful occupations.

PURPOSE.

Our purpose was to explore enablers and barriers to engaging in meaningful occupations, from the perspectives of youth, parents, and practitioners.

METHOD.

This qualitative study involved 26 participants (11 parents, eight youth ages 19 to 28 [mean = 22.3 years], seven practitioners). Data were obtained from semistructured interviews and analyzed using an interpretive descriptive approach.

FINDINGS.

Youth with DMD and neuromuscular disorders engage in meaningful occupations in a variety of ways. Occupational enablers were supports and accommodations and self-care skills and coping strategies, while occupational barriers involved societal expectations of a normative adulthood, discrimination and inaccessible environments, lack of supports and resources, medical challenges, fatigue, lack of motivation, and social isolation and depression.

IMPLICATIONS.

Practitioners should work to uncover what youth consider important and connect them to appropriate resources so they can engage in meaningful occupations.

A Review of Psychopathology Features, Personality, and Coping in Myotonic Dystrophy Type 1

BACKGROUND

The last literature review on psychopathological features in Myotonic Dystrophy type 1 had been conducted by Ambrosini and Nurnberg in 1979. Since that date, many researches had been carried out.

OBJECTIVE

The aim of this study is (i) to systematically obtain and evaluate the relevant literature on psychopathological features, personality, and coping in individuals with adult phenotypes of Myotonic Dystrophy type 1. (ii) To summarize current research findings and draw conclusions for future research.

METHODS

A systematic search was conducted on Pubmed, PubPsych, PsycInfo, Science Direct, and Scopus covering the period of January 1979 to July 2017.

RESULTS

In view of our literature review, patients show mild psychopathological problems, such as interpersonal difficulties, lack of interest, dysphoria, concern about bodily functioning, and hypersensibility. However, they do not experience more psychiatric disorder in comparison to the general population, except for personality disorders and depression. We discussed problems concerning depression's assessment tool. Patients also present symptoms of several personality disorders: avoidant personality disorder was the most common. Finally, coping strategies relative to limitations resulting from their disease have a negative impact on their quality of life.

CONCLUSIONS

In conclusion, Myotonic Dystrophy type 1 patients did not present homogeneous psychopathological and psychological features. However, based on tendencies observed among Myotonic Dystrophy type 1 patients, elements to conceptualize their social difficulties are provided.

Vocational situation and experiences from the work environment among individuals with neuromuscular diseases

BACKGROUND

Neuromuscular diseases (NMD) can affect the ability to be employed and to work, but there is limited knowledge of individuals' own perspectives of factors that are important for their vocational situation.

OBJECTIVE

To explore the vocational situation among people with NMD that are employed, and to describe their experiences of how their disability, personal and environmental factors influence their ability to continue to work.

METHODS

Nine participants with different NMD were included. A mixed-methods design was used, and data were collected by means of semi-structured and open-ended interviews, and ratings of aspects supporting or interfering with their work performance and the ability to continue to work. Data were analyzed with directed content analysis based on the International Classification of Functioning, Disability and Health, and with descriptive statistics.

RESULTS

The participants' personal characteristics, support from others at work and at home, and a flexible work organization were perceived as important factors facilitating work continuation, whereas physically demanding work assignments and factors in the physical environment were perceived as barriers.

CONCLUSIONS

Knowledge of how personal characteristics as well as support from the work organization, managers and family members can facilitate the ability to work is important for employers, staff within different parts of the health care system, and the social security system. Future research should focus on interventions that are best suited to enhance the vocational situation for individuals with NMD.

Pathogenic mechanisms underlying X-linked Charcot-Marie-Tooth neuropathy (CMTX6) in patients with a pyruvate dehydrogenase kinase 3 mutation

Charcot-Marie-Tooth disease (CMT) is the most common inherited peripheral neuropathy. An X-linked form of CMT (CMTX6) is caused by a missense mutation (R158H) in the pyruvate dehydrogenase kinase isoenzyme 3 (PDK3) gene. PDK3 is one of 4 isoenzymes that negatively regulate the activity of the pyruvate dehydrogenase complex (PDC) by reversible phosphorylation of its first catalytic component pyruvate dehydrogenase (designated as E1). Mitochondrial PDC catalyses the oxidative decarboxylation of pyruvate to acetyl CoA and links glycolysis to the energy-producing Krebs cycle. We have previously shown the R158H mutation confers PDK3 enzyme hyperactivity. In this study we demonstrate that the increased PDK3 activity in patient fibroblasts (PDK3(R158H)) leads to the attenuation of PDC through hyper-phosphorylation of E1 at selected serine residues. This hyper-phosphorylation can be reversed by treating the PDK3(R158H) fibroblasts with the PDK inhibitor dichloroacetate (DCA). In the patient cells, down-regulation of PDC leads to increased lactate, decreased ATP and alteration of the mitochondrial network. Our findings highlight the potential to develop specific drug targeting of the mutant PDK3 as a therapeutic approach to treating CMTX6.

Professional activity of Emery-Dreifuss muscular dystrophy patients in Poland

OBJECTIVES

Emery-Dreifuss muscular dystrophy (EDMD) is a very rare genetic disorder affecting skeletal and heart muscles. The aim of this study was to identify factors which might influence the ability to work in EDMD patients in Poland.

MATERIAL AND METHODS

The study included 24 patients suffering from either of the two EDMD forms: 17 with emerinopathy (EDMD1; EDMD caused by mutations in the emerin gene) and 7 with laminopathy (EDMD2; EDMD caused by the lamin A/C gene mutations). After clinical evaluation of EDMD course, study participants were questioned about their education, current and former employment, and disability certificates and pensions.

RESULTS

54% of the study participants were employed, and 90% of them had job position corresponding to their education. Undertaking work did not correlate with the level of physical performance or disease complication, but it revealed statistically significant correlation with a higher level of education (p = 0.015). Only 23% of professionally active patients were employed in a sheltered workplace. Disability certificate was granted to all EDMD2 and to 90% of EDMD1 patients. All EDMD2 and 50% of EDMD1 patients received a disability pension, which reflects more severe course of EDMD2.

CONCLUSIONS

Higher level of education increased the chance of employment, even if significant disability was present. Therefore, I hypothesize that advice on education and job counseling should be applied as early as possible after the diagnosis of EDMD.

A new locus for X-linked dominant Charcot-Marie-Tooth disease (CMTX6) is caused by mutations in the pyruvate dehydrogenase kinase isoenzyme 3 (PDK3) gene

Hereditary motor and sensory disorders of the peripheral nerve form one of the most common groups of human genetic diseases collectively called Charcot-Marie-Tooth (CMT) neuropathy. Using linkage analysis in a three generation kindred, we have mapped a new locus for X-linked dominant CMT to chromosome Xp22.11. A microsatellite scan of the X chromosome established significant linkage to several markers including DXS993 (Zmax = 3.16; θ = 0.05). Extended haplotype analysis refined the linkage region to a 1.43-Mb interval flanked by markers DXS7110 and DXS8027. Whole exome sequencing identified a missense mutation c.G473A (p.R158H) in the pyruvate dehydrogenase kinase isoenzyme 3 (PDK3) gene. The change localized within the 1.43-Mb linkage interval, segregated with the affected phenotype and was excluded in ethnically matched control chromosomes. PDK3 is one of the four isoenzymes regulating the pyruvate dehydrogenase complex (PDC), by reversible phosphorylation, and is a nuclear-coded protein located in the mitochondrial matrix. PDC catalyzes the oxidative decarboxylation of pyruvate to acetyl CoA and is a key enzyme linking glycolysis to the energy-producing Krebs cycle and lipogenic pathways. We found that the R158H mutation confers enzyme hyperactivity and binds with stronger affinity than the wild-type to the inner-lipoyl (L2) domain of the E2p chain of PDC. Our findings suggest a reduced pyruvate flux due to R158H mutant PDK3-mediated hyper-phosphorylation of the PDC as the underlying pathogenic cause of peripheral neuropathy. The results highlight an important causative link between peripheral nerve degeneration and an essential bioenergetic or biosynthetic pathway required for the maintenance of peripheral nerves.

Influences of Labour Participation Among Persons With Disabilities: A Systematic Review and Best Evidence Synthesis

A systematic literature review was conducted to assess the individual, organisation, societal, and legal influences of labour participation among individuals with a disability.Methods: Nine databases were searched, for peer-reviewed studies of individual, organisation, societal, and legal influences among disabled populations published between 1990 and 2010.

Results: Of a total of 809 papers initially selected, only 46 studies were deemed to be of sufficient quality to be included in the review.Conclusions: Numerous studies have examined labour participation among persons with physical disabilities, some among persons with chronic disabilities, and few among persons with mental disabilities. Strong evidence was found for individual and organisation influences of labour participation among persons with physical disabilities in particular pain, catastrophising, job strain, and support. Only individual influences provided strong evidence among persons with chronic disabilities and no influences provided strong evidence among those with mental disabilities. The results are presented along with methodological weaknesses and future recommendations.

Exploring employment in consultation reports of patients with neuromuscular diseases

OBJECTIVES

To explore consultation reports for patient and employment characteristics and recommendations on employment regarding patients with neuromuscular diseases (NMDs).

DESIGN

Retrospective study of multidisciplinary reports.

SETTING

An outpatient neuromuscular clinic at a university hospital.

PARTICIPANTS

Reports (N=102) of patients with NMDs.

INTERVENTIONS

Based on one-off consultations by occupational therapists, physical therapists, and speech therapists and a multidisciplinary meeting, recommendations were developed regarding therapy content and volume in primary care or rehabilitation settings.

MAIN OUTCOME MEASURES

A checklist has been developed to examine employment characteristics. A general questionnaire has been used including demographic variables and data on employment.

RESULTS

Of the 102 reports available, 86 were included for analysis. Sixty-nine reports contained information on employment. Thirty-seven patients (43%) with NMD were employed, most in white-collar or moderately strenuous jobs. Of the 37 employed patients, 28 (76%) worked using adaptations. Thirty-two (87%) had employment problems; of these, 15 (40%) needed improvement in 1 or more environmental factors. Twenty patients (54%) needed advice regarding participation in employment, of whom 19 were referred to primary care or rehabilitation settings for treatment to enhance employment participation.

CONCLUSIONS

Eighty percent of the included consultation reports contained information on employment. Less than half the patients with NMD were employed, most in office-related jobs, using some kind of adaptations. Nineteen of 20 patients who agreed to recommendations regarding therapy were adequately referred by occupational therapists and physical therapists for treatment of employment problems.

Aging with muscular dystrophy: pathophysiology and clinical management

Major advances in the fields of medical science and physiology, molecular genetics, biomedical engineering, and computer science have provided individuals with muscular dystrophy (MD) with more functional equipment, allowing better strategies for improvement of quality of life. These advances have also allowed a significant number of these patients to live much longer. As progress continues to change management, it also changes patients' expectations. A comprehensive medical and rehabilitative approach to management of aging MD patients can often fulfill expectations and help them enjoy an enhanced quality of life.

Cognitive/personality pattern and triplet expansion size in adult myotonic dystrophy type 1 (DM1): CTG repeats, cognition and personality in DM1

BACKGROUND

Although central nervous system (CNS) involvement in adult myotonic dystrophy type 1 (DM1) was described long ago, the large number of variables affecting the cognitive and personality profile have made it difficult to determine the effect of DM1 on the brain. The aim of this study was to define the cognitive and personality patterns in adult DM1 patients, and to analyse the relationship between these clinical patterns and their association with the underlying molecular defect.

METHOD

We examined 121 adult DM1 patients with confirmed molecular CTG repeat expansion and 54 control subjects using comprehensive neuropsychological tests and personality assessments with the Millon Clinical Multiaxial Inventory (MCMI)-II. We used a multiple linear regression model to assess the effect of each variable on cognition and personality adjusted to the remainders.

RESULTS

Patients performed significantly worse than controls in tests measuring executive function (principally cognitive inflexibility) and visuoconstructive ability. In the personality profile, some paranoid and aggressive traits were predominant. Furthermore, there was a significant negative correlation between the CTG expansion size and many of the neuropsychological and personality measures. The molecular defect also correlated with patients' daytime somnolence.

CONCLUSIONS

Besides muscular symptomatology, there is significant CTG-dependent involvement of the CNS in adult DM1 patients. Our data indicate that the cognitive impairment predominantly affects the fronto-parietal lobe.

Predictors of disrupted social participation in myotonic dystrophy type 1

OBJECTIVE

To identify personal and environmental predictors of the most disrupted participation domains in people with myotonic dystrophy type 1 (DM1).

DESIGN

Cross-sectional study.

SETTING

Outpatient neuromuscular clinic.

PARTICIPANTS

Adults (n=200; 121 women), age 18 years or older (mean age, 47 y), with a confirmed diagnosis of DM1 were selected from the registry of a neuromuscular clinic (N=416). Fifty-two participants had the mild phenotype and 148 the adult phenotype.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Social participation in mobility, housing, employment, and recreation was assessed with the Life Habits Measure. Disrupted participation was based on whether help was needed in performing most life habits because of incapacities or environmental barriers. Environmental factors were assessed by using the Measure of the Quality of the Environment. Personal factors were assessed with standardized instruments including the Berg Balance Scale, the Krupp Fatigue Severity Scale, and manual muscle testing.

RESULTS

A large proportion of participants (45%-61%) reported disrupted participation in all 4 domains. Lower-extremity strength (odd ratios [OR], 15.0-5.5; P<.050) and higher fatigue (OR, 6.0-2.6; P<.05) were present in participants with disrupted participation. With regard to environmental factors, family support (OR, 3.6-2.5; P<.05) and public services (OR, 2.8-2.2; P<.05) were perceived as barriers for participants with disrupted participation in most domains.

CONCLUSIONS

This study identified personal and environmental factors that may influence the trajectory toward disrupted participation in individuals with DM1. Fatigue, strength, family support, and public services were found to be independent predictors of disrupted participation.

Towards an integrative approach to the management of myotonic dystrophy type 1

Myotonic dystrophy type 1 (DM1) is the most common type of muscular dystrophy in adults. Approximately 60% of individuals report either having difficulty performing or being unable to carry out some activities related to home management, mobility and transportation, work and leisure. Employment, educational level and income are, on average, lower than in the general population. The complexity and variability of disease manifestations in DM1 undoubtedly pose a challenge as regards anticipating all potential problems and developing a plan for health and community management. This article presents a conceptual model for DM1 management as well as a brief discussion of an approach for developing interdisciplinary health and community services.

The correlation of CTG repeat length with material and social deprivation in myotonic dystrophy

Socioeconomic deprivation has long been recognized as a prominent feature of myotonic dystrophy type 1 (DM1), but studies performed before the discovery of the mutation causing DM1 may have suffered an ascertainment bias towards the more severe forms of the disease. We have sought to clarify the relationship between CTG repeats, muscular impairment, and socioeconomic characteristics of 200 patients with DM1. Patients with DM1 reported lower educational attainment, lower employment rate, lower family income, and higher reliance on social assistance than the reference population. Logistic regression showed, on one hand, that CTG repeats and marital status were significant predictors of social assistance recipiency and, on the other hand, that CTG repeats and gender were significant predictors of low social support from family, after adjustment for age, gender, degree of muscular impairment, CTG repeats, educational level, and marital status. For example, each additional 100 CTG repeats was found to increase the odds of relying on social assistance by about 35% and having low social support by about 22%. The chances of experiencing socioeconomic deprivation are loaded heavily against patients with DM1. The relationship between increased CTG repeat length and higher risk of material and social deprivation must be acknowledged in the clinical management of DM1.

Measurement of participation in myotonic dystrophy: Reliability of the LIFE-H

Person-perceived social participation is an important aspect to measure in rehabilitation in neuromuscular disorders. The objective was to document the test-retest and inter-rater reliability of the Assessment of Life Habits (LIFE-H), in a sample of individuals with myotonic dystrophy (DM1). Twenty-eight participants with myotonic dystrophy aged between 29 and 75 years (mean: 52.7) were recruited. The LIFE-H questionnaire was administered at three different occasions. The LIFE-H demonstrates high test-retest and inter-rater reliability (ICCs: 0.80-0.92) for the total score and subscores (daily activities and social roles). Moderate to high test-retest reliability (ICCs: 0.76-0.92) was found for most categories (8/10) of the LIFE-H. Similar results were obtained for inter-rater reliability (ICCs: 0.68-0.93). Moderate to high agreement using the Bland and Altman method was obtained for most categories. The LIFE-H, a measure of person-perceived social participation, demonstrates adequate test-retest and inter-rater reliability for clinical and research purposes in myotonic dystrophy.

Impact of a Home-Based Activity and Dietary Intervention in People With Slowly Progressive Neuromuscular Diseases

OBJECTIVE

To determine whether a home-based activity and dietary intervention can increase activity level, reduce caloric intake, and impact positively components of metabolic syndrome in a disabled population.

DESIGN

Testing occurred at 3 points during the 6-month intervention period (baseline, 3mo, 6mo) and at 6 months postintervention. Each test point included laboratory testing of anthropometric and metabolic variables and 3 days of home-based activity and dietary monitoring. A personally tailored activity and dietary prescription based on baseline testing was implemented during the 6-month intervention period.

SETTING

Human performance laboratory of a university and each subject's home.

PARTICIPANTS

Twenty adult volunteer ambulatory subjects with several types of slowly progressive neuromuscular disease (NMD).

INTERVENTION

Using a pedometer, subjects were instructed to increase number of steps by 25% over their baseline determined from home monitoring. An individualized dietary prescription was provided focusing on problematic issues identified from the baseline dietary profile.

MAIN OUTCOME MEASURES

Body composition, physical activity, dietary intake, energy expenditure, gait efficiency, metabolic variables, and quality of life.

RESULTS

At the end of the protocol, mean step count increased approximately 27% above baseline (P=.001) and caloric intake decreased over 300kcal/d (P=.002). Body fat percentage significantly decreased (from 33.3%+/-1.5% to 32.6%+/-1.6%, P=.032). Gait efficiency did not change, and metabolic variables did not show statistically significant improvement, although 2 of the 5 subjects originally meeting the criteria for metabolic syndrome at baseline no longer met the criteria at the end of the intervention period. Six months after completing the protocol, caloric intake remained significantly reduced (P=.02), but although mean step count remained elevated, it was not statistically significant.

CONCLUSIONS

Using a home-based protocol, people with NMD can increase activity and reduce caloric intake. Although this 6-month program showed positive changes, it was insufficient to affect risk factors associated with metabolic syndrome. It remains to be seen if a program longer than 6 months or a more rigorous program could lead to a reduction in the risk factors associated with metabolic syndrome.

Predictors of employment of men with HIV/AIDS: a longitudinal study

OBJECTIVE

To identify patterns and predictors of work status and number of hours employed in a group of men with human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS).

METHODS

A total of 141 participants had semiannual neuropsychiatric, psychosocial, and medical assessments over a period of 30 months. These six occasions provided the basis for identifying patterns of employment (part-time, full-time, or unemployed). Those who completed neuropsychological testing, introduced at visit 4, constitute the sample used to identify predictors of number of hours employed, using multiple regression analysis with mixed procedure.

RESULTS

Over 30 months, 20% were continuously employed full-time, another 9% were continuously employed part-time, and 40% were continuously unemployed. Employment status changed for 31%: 4% who worked at baseline stopped, 13% started or increased their hours, 8% decreased their hours, and 6% showed a fluctuating pattern. The major parameters consistently associated with unemployment or partial employment, in order of influence, were financial (disability benefits), psychiatric (past/current diagnosis of major depression and/or dysthymia), medical (physical limitations), cognitive (executive function), and education. In contrast, age, ethnicity, laboratory markers of HIV illness status, vocational rank, and past or current substance dependence did not predict work status.

CONCLUSIONS

Overall, those who worked continued to work. However, despite improved health, most men who were unemployed at study baseline did not return to work. Structure of disability benefits, lifetime depressive disorder, physical limitations, and impairment in some areas of cognitive function each appear to represent significant barriers to work. Returning to work is evidently difficult, and clinicians may keep this in mind when recommending leaving work unless medically necessary. Specific interventions and policy changes regarding disability benefits may be needed to promote return to work for people with HIV/AIDS whose health is restored and who contemplate re-employment.