Pain in youths with neuromuscular disease

Pain in Children and Adolescents with Spinal Muscular Atrophy: A Longitudinal Study from a Patient Registry

Spinal muscular atrophy (SMA) is a devastating genetic neurodegenerative disease caused by the insufficient production of Survival Motor Neuron (SMN) protein. It presents different phenotypes with frequent contractures and dislocations, scoliosis, and pain. This study aims to report the prevalence and description of pain and how it affects daily life by analyzing a new ad hoc questionnaire. An observational study of patients under 18 years of age with SMA was conducted at two referral centers in Spain. Data were analyzed using a descriptive analysis and a Bayesian ordinal regression model to assess the association with clinical and demographic variables. Fifty-one individuals were included in this study, 27% of whom reported pain with a median duration of 5.2 years and a mean Visual Analogic Scale (VAS) score of 5. Notably, 77% were receiving disease-modifying treatment, with more than 50% receiving analgesic treatment. The Bayesian model showed that functional status, lower limb contractures, and number of visits have a high probability (>90%) of influencing pain. Thus, the prevalence of pain in the SMA population under 18 years is substantial, and its presence could be associated with lower limb contractures, better functional status, and higher RULM (Revised Upper Limb Module) scores.

'It becomes the new everyday life' - experiences of chronic pain in everyday life of people with limb-girdle muscular dystrophy

PURPOSE

To investigate experiences and reflections on challenges in everyday life of people living with limb-girdle muscular dystrophy (LGMD) and chronic pain in order to improve rehabilitation services.

MATERIALS AND METHODS

The design for this study was qualitative using the Interpretive Description methodology and the salutogenic theory of Sense of Coherence as the theoretical framework. Four semi-structured focus group interviews were conducted with 19 adults with LGMD from April to May 2021. The interviews were conducted online due to COVID-19.

RESULTS

Living with chronic pain and LGMD affected everyday life in terms of the participants' overall Sense of Coherence. Beneficial or unfavorable coping strategies were identified within four interrelated categorical themes: pain management, normality comprehension, affected emotional sentiment and altered identity.

CONCLUSION

Healthcare professionals should acknowledge possible chronic pain secondary to LGMD. Chronic pain appears to be a prevalent problem in people with LGMD with negative impact on everyday life, yet patients with LGMD did not receive sufficient information and necessary tools from health professionals to cope with chronic pain. Thus, adequate pain management appeared to be a difficult and self-taught process. Educating health professionals on how to support patients with LGMD and chronic pain is needed.IMPLICATIONS FOR REHABILITATIONHealth professionals should acknowledge and address the possibility of chronic pain secondary to limb-girdle muscular dystrophy (LGMD) and educate patients in pain management.Physiotherapy, energy management and engagement in meaningful activities may help patients gain some control of pain and limit the consequences of pain on everyday life.Supporting patients to accept pain and to shift focus towards their current capabilities may potentially improve pain management.Educating health professionals on how to support patients with LGMD and chronic pain is needed.

Comorbidities and medical complexities of mobility device users: a retrospective study

OBJECTIVE

To determine the medical complexities and comorbidities of individuals who utilise wheeled mobility devices. As well as, to examine costly events including the number of urinary tract infections (UTIs), hospitalizations, urgent care(UC)/emergency department (ED) visits that are commonly seen in this population over a period of time one year prior to and one year post receiving their wheeled mobility equipment.

DESIGN/SETTING

A retrospective data review of 857 individual medical charts at a Level 1 Trauma Hospital and Clinic System.

PARTICIPANTS

330 male and female (24-92 years old) mobility device users with a wide range of diagnoses, of which: 56 used manual wheelchairs (MWC),138 scooters (POV), 123 power wheelchairs without integrated standing (PWC), and 13 power wheelchairs with integrated standing (iS-PWC).

RESULTS

Overall, 92% (n = 304) had at least three medical comorbidities and medical complexities. The most common comorbidity was pain (91%). A change was noted in a lower incidence of UTIs in those using an iS-PWC, respectively 23% with at least 1 UTI in the year prior to and 8% in the year after the mobility device evaluation.

CONCLUSIONS

The large number of comorbidities and medical complexities amongst all mobility device users is concerning. The burden and the accompanying healthcare costs of this population is high. The potential that iS-PWC and other interventions could have on reducing these issues should be explored further.Implications of rehabilitationRegardless of a person's primary diagnosis or the wheeled mobility device they use, 100% have at least one and 92% have at least three comorbidities and medical complexities if they spend the majority of their day sittingThe high healthcare cost situations such as Emergency Department visits, Urgent Care visits, hospitalizations, and Urinary Tract Infections are present across those that use all mobility device types and the means to potentially reduce these incidences should be further exploredThe introduction of integrated standing within a power wheelchair, as a means to minimize the frequency of comorbidities and medical complications, should also be investigated further.

Chronic pain interference assessment tools for children and adults who are unable to self-report: A systematic review of psychometric properties

AIM

To identify and evaluate psychometric properties of assessment tools for assessing pain interference in children, adolescents, and adults with chronic pain and the inability to self-report.

METHOD

The protocol was registered with PROSPERO (CRD42022310102). A search was run in MEDLINE, Embase, and PsycInfo (29th March 2022) to identify articles reporting psychometric properties of pain interference assessment tools for children, adolescents, and adults with chronic pain and the inability to objectively self-report pain. Retrieved studies were reviewed by two authors (MGS, LCF) and study quality was assessed using COSMIN.

RESULTS

Psychometric properties of 10 pain interference tools were assessed from 33 studies. The Paediatric Pain Profile (PPP) had low-quality evidence for content validity and internal consistency with children and adolescents who are unable to self-report. No tools for adults had evidence for content validity and internal consistency. No tool had evidence for all nine psychometric properties.

INTERPRETATION

The PPP is recommended for pain interference assessment in children and adolescents with chronic pain and the inability to self-report. Few tools are available for adults. Three tools for children (Patient-Reported Outcome Measurement Information System Pediatric Proxy Pain Interference Scale; Bath Adolescent Pain Questionnaire for Parents; modified Brief Pain Inventory-Proxy [mBPI]) and three tools for adults (Doloplus-2; Patient-Reported Outcome Measurement Information System Pain Interference Scale-proxy; Brief Pain Inventory-proxy) are promising but require further investigation.

Functional level and its relationship to upper extremity function, pain, and muscle stiffness in children with Duchenne muscular dystrophy

BACKGROUND

The progressive symptoms of Duchenne muscular dystrophy (DMD) negatively affect upper extremity skills, and this may have an effect that reduces the independence of daily life.

AIMS

The purpose of this study is to investigate the relationship between functional level and upper extremity function, pain, and stiffness in children with DMD.

METHODS

A total of 38 children with DMD were participated. The functional level of the upper and lower extremities was assessed using Brooke scale and Vignos scale. Upper extremity function, pain and stiffness were assessed using Upper Limb Short Questionnaire (ULSQ). The correlation between ULSQ and Brooke and Vignos scales was calculated.

RESULTS

A moderate positive correlation was calculated between ULSQ total scores and Vignos scale (r = 0.52, p < 0.001) and Brooke scale (r = 0.65, p < 0.001). There was a moderate positive correlation between Vignos scale scores and ULSQ subscores of function (r = 0.42, p < 0.05) and stiffness (r = 0.56, p < 0.001); no significant correlation was found between pain scores and Vignos scale (p = 0.053). There was a moderate positive correlation between the function (r = 0.54, p < 0.001), pain (r = 0.40, p < 0.05), and stiffness (r = 0.62, p < 0.001) subscores of the ULSQ with the Brooke scale.

CONCLUSION

In our study, there was a significant relationship between the functional level of patients with DMD and upper extremity function, pain, and muscle stiffness.

Pain Widespreadedness, and Not Primary Pain Location, is Associated With Comorbid Symptoms in Children With Chronic Pain

OBJECTIVES

Pediatric chronic pain represents heterogeneous diagnoses; often, primary pain location informs research classifications and treatment. In contrast, recent research has highlighted the role of widespread pain and this perspective has been adopted in assessments in specialty pediatric pain clinics. The lack of direct comparison between these 2 methods of categorizing pediatric chronic pain may hinder the adoption of evidence-based practices across the spectrum of care. Therefore, this study aimed to compare whether primary pain location or pain widespreadedness is more informative for pain-related symptoms in pediatric chronic pain.

METHODS

Youth (n=223) between the ages of 8 to 23 years (M=15.93, SD=2.11, 83% female) completed surveys upon intake at the pediatric chronic pain clinic. Free-text entries of primary pain location were coded into categories: headache, abdominal pain, and musculoskeletal pain. Additional domains assessed included widespread pain, pain interference, kinesiophobia, catastrophizing, anxiety, depression, sleep, and fatigue.

RESULTS

Differences based on primary pain location only emerged for kinesiophobia, F(2150)=8.20, P<0.001, with the highest scores among those with musculoskeletal pain. In contrast, controlling for sex, age, and pain intensity, pain widespreadedness was associated with pain interference, pain catastrophizing, fatigue, anxiety, and depression (P<0.05).

DISCUSSION

Pain widespreadedness was more consistently associated with pain-related outcomes among pediatric chronic pain patients than primary pain location, and body maps may be useful in determining a nociplastic pain mechanism to inform treatment. Improved assessment of pediatric pain mechanisms may help advance more precise treatment delivery.

Reliability and validity of the Turkish version of the Upper Limb Short Questionnaire in Duchenne muscular dystrophy

PURPOSE

This study aimed to evaluate the construct validity and reliability of the Turkish version of the Upper Limb Short Questionnaire in Duchenne muscular dystrophy.

MATERIALS AND METHODS

A total of 41 children with Duchenne muscular dystrophy have participated in the study. Upper and lower extremities functional levels were assessed with Vignos Scale and Brooke Upper Extremity Functional Rating Scale, respectively. The construct validity of the questionnaire was determined using the correlation between the Upper Limb Short Questionnaire and ABILHAND-Kids. The Cronbach alpha value was calculated to determine internal consistency. To determine test-retest reliability, 17 randomly selected children were evaluated seven days after the first evaluation, and the 'Intraclass Correlation Coefficient' value was calculated.

RESULTS

There was a moderate level of positive correlation between the Upper Limb Short Questionnaire scores and the Vignos Scale (r = 0.52, p < 0.001) and the Brooke Upper Extremity Functional Rating Scale (r = 0.65, p < 0.001). There was a strong correlation between the Upper Limb Short Questionnaire and ABILHAND-Kids in the negative direction (r= -0.80, p < 0.001). Internal consistency of the ULSQ was fairly high (Cronbach's alpha = 0.785) and test-retest reliability was good (ICC = 0.86).

CONCLUSION

The Turkish version of Upper Limb Short Questionnaire is a valid and reliable scale for children with Duchenne muscular dystrophy. It can be a useful tool in the UE clinical evaluation of children with Duchenne muscular dystrophy.

Prevalence of chronic pain in a national cohort of patients with limb-girdle muscular dystrophy: a cross-sectional study

PURPOSE

The aim was to investigate the prevalence, characteristics, predictors, and consequences of chronic pain in a national cohort of patients with limb-girdle muscular dystrophy (LGMD).

MATERIALS AND METHODS

Questionnaires were sent to all Danish LGMD patients (≥18 years of age) registered with the National Rehabilitation Center for Neuromuscular Diseases.

RESULTS

Of 209 patients, 121 responded. 44.7% of the patients experienced persistent (daily or constant) chronic pain lasting more than 3 months. 21.0% of patients experienced chronic pain that was not daily. Most pain patients experienced three or more pain problems, primarily in the lower back, neck, shoulders, hips, and legs. Symptoms suggestive of neuropathic pain were sometimes present. Patients with persistent chronic pain reported moderate pain interference with daily activities, greater psychological distress, and lower quality of life compared to patients without pain but did not differ regarding physical functioning. Sex, age, LGMD duration, LGMD type, mechanical ventilation use, mobility, arm function, or performance on activities of daily living did not predict chronic pain.

CONCLUSION

Chronic pain is common in patients with LGMD. Chronic pain should be considered an important component of LGMD and addressed in the clinic and rehabilitation setting from a biopsychosocial perspective.Implication for rehabilitationChronic pain is highly prevalent in patients with limb-girdle muscular dystrophy.Health professionals need to systematically ask patients about pain and the influence of pain on everyday life irrespective of LGMD-duration and extent of muscle wastage.Chronic pain and psychological distress need to be addressed in the clinic and rehabilitation setting as an additional disabling component of LGMD and this should be done within a biopsychosocial framework.

Chronic pain, psychological distress, and quality of life in males with Duchenne muscular dystrophy

AIM

To describe chronic pain in Duchenne muscular dystrophy (DMD) from children's/adolescents' perspectives, explore patient variables associated with self-reported pain, and examine the relationship between chronic pain, psychological functioning, and health-related quality of life (HRQoL).

METHOD

This observational study included a paediatric cohort (aged 8-18 years; median age 9 years 4 months) with DMD under multidisciplinary care (n = 45). Clinical data of the latest visit were extracted from the electronic health record and assessment of pain, psychological distress, and HRQoL were performed during the same visit.

RESULTS

Thirty-two patients reported pain during the previous 4 weeks, and 18 reported persistent or recurrent chronic pain. Average pain intensity of chronic pain was mild, with regions of the legs (n = 12), lower back (n = 6), hips (n = 6), and shoulder (n = 6) most frequently affected. Older age, higher body mass index, being non-ambulatory, wheelchair dependency, and spinal deformities were contextual variables related to the presence of chronic pain. Furthermore, chronic pain was significantly associated with psychological distress and reduced HRQoL in paediatric patients with DMD.

INTERPRETATION

Chronic pain in paediatric DMD is frequent and widespread, highlighting the need for pain to be addressed in the routine care of affected young people. Chronic pain may make a significant contribution to psychological distress and impaired HRQoL in paediatric patients with DMD.

Pain characteristics among individuals with Duchenne muscular dystrophy according to their clinical stage

Background

Assessment of pain is not routine, standardized, or well-understood in individuals with Duchenne muscular dystrophy (DMD), even though pain is a common problem reported by more than half of the patients with DMD. Previous studies in this area included multiple neuromuscular diseases with highly variable phenotypes. Therefore, our aim was to specifically focus on DMD and evaluate the comprehensive pain characteristics according to the disease stages, from ambulatory to late non-ambulatory.

Methods

This cross-sectional study was conducted in an out-patient pediatric rehabilitation clinic including 148 male participants with confirmed DMD (14.5 ± 5.3 years of age). Face-to-face interviews were conducted using a structured questionnaire concerning the pain frequency, duration, intensity, location, aggravating/relieving factors, pain interference (Brief Pain Inventory), pain phenotype (PainDETECT Questionnaire), and functional ability (DMD Functional Ability Self-Assessment Tool). Pain characteristics were analyzed according to the clinical stage: ambulatory (Amb), early non-ambulatory (ENA), and late non-ambulatory (LNA).

Results

Of the 148 participants who completed the assessment, 66 (44.6%) reported pain during the previous 4 weeks. There were no differences in the pain duration or intensity among the three groups. Pain location (Amb: calf, ENA: knee, LNA: lumbosacral region), aggravating factor (Amb: ambulation, ENA: transfer, LNA: sitting), and relieving factor (Amb: rest and massage, ENA and LNA: positional change) differed according to the clinical stage. Individuals in the LNA stage reported an increase in the frequency of pain and number of pain sites. The effect of pain on mood was also found to be greater in the LNA group than in the other clinical stages.

Conclusion

There is a change in the pain characteristics, including the location, aggravating/relieving factors, pain frequency, and pain interference, with the progress of the disease in patients with DMD. Thus, clinicians could more efficiently and critically assess and manage the patients’ pain based on these findings.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12891-022-05504-5.

Pain burden in children with cerebral palsy (CPPain) survey: Study protocol

Pain is a significant health concern for children living with cerebral palsy (CP). There are no population‐level or large‐scale multi‐national datasets using common measures characterizing pain experience and interference (ie, pain burden) and management practices for children with CP. The aim of the CPPain survey is to generate a comprehensive understanding of pain burden and current management of pain to change clinical practice in CP. The CPPain survey is a comprehensive cross‐sectional study. Researchers plan to recruit approximately 1400 children with CP (primary participants) across several countries over 6‐12 months using multimodal recruitment strategies. Data will be collected from parents or guardians of children with CP (0‐17 years) and from children with CP (8‐17 years) who are able to self‐report. Siblings (12‐17 years) will be invited to participate as controls. The CPPain survey consists of previously validated and study‐specific questionnaires addressing demographic and diagnostic information, pain experience, pain management, pain interference, pain coping, activity and participation in everyday life, nutritional status, mental health, health‐related quality of life, and the effect of the COVID‐19 pandemic on pain and access to pain care. The survey will be distributed primarily online. Data will be analyzed using appropriate statistical methods for comparing groups. Stratification will be used to investigate subgroups, and analyses will be adjusted for appropriate sociodemographic variables. The Norwegian Regional Committee for Medical and Health Research Ethics and the Research Ethics Board at the University of Minnesota in USA have approved the study. Ethics approval in Canada, Sweden, and Finland is pending. In addition to dissemination through peer‐reviewed journals and conferences, findings will be communicated through the CPPain Web site (www.sthf.no/cppain), Web sites directed toward users or clinicians, social media, special interest groups, stakeholder engagement activities, articles in user organization journals, and presentations in public media.

Prevalence of Pain within Limb Girdle Muscular Dystrophy R9 and Implications for Other Degenerative Diseases

Our primary aim was to establish the prevalence of pain within limb girdle muscular dystrophy R9 (LGMDR9). As part of the Global FKRP Registry, patients are asked to complete the Short Form McGill Pain Questionnaire (SF-MPQ) annually. We used the results of this questionnaire to determine individuals’ maximum pain score and total pain score and examined overall pain intensity and associations between pain intensity and LGMDR9 genotypes, age, and ambulatory status. We also considered the pain descriptors used and pain progression over time. Of the 502 patients, 87% reported current pain and 25% reported severe current pain. We found no associations in pain severity between the different genotypes of LGMDR9. However, we did find statistically significant associations between pain severity and ambulatory status and between our paediatric and adult populations. We found pain descriptors to be more common words that one may associate with non-neural pain, and we found that a significant number of individuals (69%) reported a fluctuating pain pattern over time. We concluded that pain should be considered a significant issue among individuals with LGMDR9 requiring management. Implications regarding assessment of pain for other degenerative diseases are discussed.

Longitudinal study of early adaptation to the coronavirus disease pandemic among youth with chronic pain and their parents: effects of direct exposures and economic stress

ABSTRACT

The novel coronavirus disease (COVID-19) has caused prolonged disruptions in daily life for many communities. Little is known about the impact of the COVID-19 pandemic on the health and well-being of youth with chronic pain and their families. We conducted a longitudinal, mixed-methods study to characterize early adaptation to the COVID-19 pandemic among 250 families of youth (ages 12-21 years) diagnosed with chronic headache (64%) or other chronic pain conditions (36%) and to determine whether direct exposures to COVID-19 and secondary economic stress modified symptom trajectories. Youth and parents reported on pain interference, anxiety, depression, and insomnia symptoms at 4 waves of data collection from April 2020 to July 2020. We also collected qualitative data on the impact of the pandemic on the youth's pain problem. Nearly half of our sample (49.6%) experienced direct exposures to COVID-19. Secondary economic stress was also common, affecting 44.4% of families. Symptom trajectories for pain, insomnia, depression, and anxiety remained stable or improved for most participants, indicating adaptive adjustment. However, overall symptom burden was high with persistent and clinically elevated depression, anxiety, and insomnia symptoms common among youth and parents. Direct exposures to COVID-19 did not modify symptom trajectories. However, youth pain interference and parent insomnia worsened in families who experienced secondary economic stress. Qualitative data revealed perceived benefits and harms from school closures on the youth's pain problem. Our findings of high symptom burden suggest that pediatric pain clinicians should offer distance assessment and treatment (eg, through telemedicine) to avoid pandemic-related disruptions in pain care.

Everyday Life Participation Using Powered Wheelchair Standing Devices by Boys With DMD

Powered wheelchair standing devices (PWSDs) allow supported standing for activity; however, little is known about their use. To understand factors affecting use of supported standing for participation among boys with Duchenne muscular dystrophy (DMD) and characteristics of successful users, we gathered data over 7 days from boys who had used PWSDs for 24 months, using a smartphone application. We used descriptive statistics to identify factors that affected their participation. Physical/social engagement and independence were motivators for standing in PWSDs. Enablers included positive attitudinal/social environments. Barriers included pain during supported standing and lack of physical environment accessibility. The characteristics of successful users were identified. Supported standing via PWSDs has potential to improve participation for boys with DMD. The disease stage, individual personal factors and environmental supports impact on use. Therapists should carefully consider and manage factors that impact on uptake and sustainability of use.

The Prevalence, Characteristics and Impact of Chronic Pain in People With Muscular Dystrophies: A Systematic Review and Meta-Analysis

Chronic pain is a frequent, yet under-recognized and under-assessed problem in people with muscular dystrophies (MDs). Knowledge of the prevalence and characteristics of chronic pain, and its impact on function and quality of life is limited and lacks systematic exploration. This article aims to systematically review and synthesize existing literature that addresses chronic pain prevalence, characteristics and impact in people with different types of MDs. The present meta-analysis showed that the estimated prevalence of chronic pain in MDs is high and appears to be similar across different diagnostic groups: 68% (95% CI: 52%-82%) in FSHD, 65% (95% CI: 51%-77%) in DM, 62% (95% CI: 50%-73%) in BMD/DMD, and 60% (95% CI: 48%-73%) in LGMD, although it should be noted that heterogeneity was high in some diagnostic groups. On average, people with FSHD and DM present with moderate pain intensity. The lumbar spine, shoulders and legs are the most frequent sites of chronic pain among people with FSHD, DM, BMD/DMD, and LGMD, with little variation. Diffuse pain across multiple body sites was reported by a notable proportion of these individuals. Chronic pain has a negative impact on daily life activities in people with MDs, and may also contribute to decreased quality of life. The protocol for this review has been published on PROSPERO (CRD42020168096). PERSPECTIVES: This is the first systematic review and meta-analysis exploring the prevalence, and nature and impact of chronic pain in people with MDs. The present study demonstrates how common chronic pain is across various MD populations and highlights the need for better recognition and understanding of the nature and impact of pain from health professionals.

Pain Phenotypes in Rare Musculoskeletal and Neuromuscular Diseases

For patients diagnosed with a rare musculoskeletal or neuromuscular disease, pain may transition from acute to chronic; the latter yielding additional challenges for both patients and care providers. We assessed the present understanding of pain across a set of ten rare, noninfectious, noncancerous disorders; Osteogenesis Imperfecta, Ehlers-Danlos Syndrome, Achondroplasia, Fibrodysplasia Ossificans Progressiva, Fibrous Dysplasia/McCune-Albright Syndrome, Complex Regional Pain Syndrome, Duchenne Muscular Dystrophy, Infantile- and Late-Onset Pompe disease, Charcot-Marie-Tooth Disease, and Amyotrophic Lateral Sclerosis. Through the integration of natural history, cross-sectional, retrospective, clinical trials, & case studies we described pathologic and genetic factors, pain sources, phenotypes, and lastly, existing therapeutic approaches. We highlight that while rare diseases possess distinct core pathologic features, there are a number of shared pain phenotypes and mechanisms that may be prospectively examined and therapeutically targeted in a parallel manner. Finally, we describe clinical and research approaches that may facilitate more accurate diagnosis, monitoring, and treatment of pain as well as elucidation of the evolving nature of pain phenotypes in rare musculoskeletal or neuromuscular illnesses.

Musculoskeletal Pain Outcomes Pre- and Post Intrathecal Baclofen Pump Implant in Children With Cerebral Palsy: A Prospective Cohort Study

Objective

To characterize musculoskeletal pain intensity, duration, frequency, and interference with activities of daily living in children with cerebral palsy (CP) before and after intrathecal baclofen pump placement.

Design

Prospective cohort study.

Setting

Children's tertiary hospital.

Participants

Participants were children with CP (N=32; 53% male; mean age, 9.9y; age range, 4-17y). The majority of participants had a CP diagnosis of quadriplegia (76%) and relied on wheeled mobility (91%).

Interventions

Assessments were completed pre- and post intrathecal baclofen pump implant.

Main Outcome Measures

Because of considerable patient heterogeneity, both pain measures (Brief Pain Inventory, Dalhousie Pain Interview) were completed by proxy (parent) report at the time of the procedure and approximately 6 months after intrathecal baclofen (ITB) pump placement.

Results

Prior to implant, 31% of participants were living with constant pain, which reduced to 6% post ITB implant (P<.001). Based on Wilcoxon signed rank tests, pain duration significantly decreased post ITB pump implant (P<.01).

Conclusions

This prospective analysis supports the anecdotal and retrospective evidence that musculoskeletal pain decreases in CP following ITB pump implant. The greatest effect appears to be on the duration of pain experience. Pain did not decrease for all individuals, and it would be worth further investigation to better understand the relation between patient characteristics and pain outcomes.

Subacute Pain Trajectories following major musculoskeletal surgery in adolescents: A Pilot Study

Background: Adolescents who undergo major surgery experience high rates of disabling acute and chronic postsurgical pain (CPSP). However, little is known about the subacute period when acute to chronic pain transition occurs.

Aims: The aims of this study were to examine feasibility of electronic daily monitoring of pain and opioid use in adolescents during the first 30 days at home following major surgery and identify target features of subacute pain curves associated with CPSP at 4 months.

Methods: Twenty-five youth (10–18 years) undergoing major musculoskeletal surgery reported daily pain severity, interference, and opioid use on the Brief Pain Inventory each evening for 30 days after hospital discharge to form short time series trajectories. At 4 months, youth reported on pain intensity and health-related quality of life. Characteristics of subacute pain severity and interference curves were compared by 4-month CPSP status.

Results: At 4 months, 20.8% of youth met criteria for CPSP. During the 30-day monitoring period, youth who went on to develop CPSP reported high pain severity on 45.9% of days compared to 2.9% of days in youth who recovered (P = 0.005) and high pain interference on 49.4% of days vs. 9.7% in youth who recovered (P = 0.01). Pain variability and rate of change were not significantly associated with CPSP in our pilot sample.

Conclusions: We found it feasible to collect daily pain data in youth recovering at home after major surgery. Pilot findings suggest that daily electronic monitoring may identify early recovery problems at home after surgery. Larger studies are needed to validate subacute pain trajectory features to identify risk for CPSP.

Cognitive-behavioural therapy combined with music therapy for chronic fatigue following Epstein-Barr virus infection in adolescents: a feasibility study

​BACKGROUND

Cognitive-behavioural therapy (CBT) is effective in chronic fatigue syndrome. However, CBT has not been investigated in postinfectious chronic fatigue (CF), nor is it known whether addition of therapeutic elements from other disciplines might be feasible. We studied the feasibility of a combined CBT and music therapy intervention for CF following Epstein-Barr virus (EBV) infection in adolescents.

​METHODS

Adolescents (12-20 years old) participating in a postinfectious cohort study who developed CF 6 months after an acute EBV infection were eligible for the present feasibility study. A combined CBT and music therapy programme (10 therapy sessions and related homework) was compared with care as usual in a randomised controlled design. Therapists and participants were blinded to outcome evaluation. Endpoints included physical activity (steps/day), symptom scores, recovery rate and possible harmful effects, but the study was underpowered regarding efficacy. Total follow-up time was 15 months.

​RESULTS

A total of 43 individuals with postinfectious CF were included (21 intervention group, 22 control group). Seven individuals left the study during the first 3 months, leaving 15 in the intervention group and 21 in the control group at 3 months' follow-up. No harmful effects were recorded, and compliance with appointment was high. In intention-to-treat analyses, number of steps/day tended to decrease (difference=-1158, 95% CI -2642 to 325), whereas postexertional malaise tended to improve (difference=-0.4, 95% CI -0.9 to 0.1) in the intervention group at 3 months. At 15 months' follow-up, there was a trend towards higher recovery rate in the intervention group (62% vs 37%).

​CONCLUSION

An intervention study of combined CBT and music therapy in postinfectious CF is feasible, and appears acceptable to the participants. The tendencies towards positive effects on patients' symptoms and recovery might justify a full-scale clinical trial.

​TRIAL REGISTRATION NUMBER

NCT02499302.

Fatal liver failure after therapeutic doses of paracetamol in a patient with Duchenne muscular dystrophy and atypical pharmacogenetic profile of drug-metabolizing enzymes

Paracetamol has a good safety profile, but pharmacogenetic differences in drug-metabolizing enzymes may have an impact on its risk of hepatotoxicity. We present a case of fatal acute liver failure (ALF) after therapeutic doses of paracetamol in a patient with Duchenne muscular dystrophy, where pharmacogenetic screening was conducted. This 30-year-old man was electively admitted for a tracheostomy. A total of 14.5 g paracetamol was given over four days. He developed a severe ALF and died 11 days after admission. Pharmacogenetic screening showed absent CYP2D6 metabolism and increased CYP1A2 activity, which may have increased the formation of toxic intermediate metabolite, N-acetyl-p-benzo-quinone imine (NAPQI). He also had decreased function of UGT2B15, which increases the amount of paracetamol available for metabolism to NAPQI. Having a reduced muscle mass and thus a reduced glutathione levels to detoxify produced NAPQI may add to the risk of toxicity. This case may indicate that pharmacogenetic variability is of potential relevance for the risk of paracetamol-induced hepatotoxicity in patients with neuromuscular diseases. Further studies should investigate if pharmacogenetic screening could be a tool to detect potentially increased risk of hepatotoxicity in these patients at therapeutic doses of paracetamol and hence provide information for selection of analgesic treatment.

Cognitive-behavioural therapy combined with music therapy for chronic fatigue following Epstein-Barr virus infection in adolescents: a randomised controlled trial

BACKGROUND

Cognitive-behavioural therapy (CBT) is effective in chronic fatigue (CF) syndrome. However, CBT has not been investigated in postinfectious CF, nor is it known whether addition of therapeutic elements from other disciplines might be useful. We explored combined CBT and music therapy intervention for CF following Epstein-Barr virus (EBV) infection in adolescents.

METHODS

Adolescents (12-20 years old) participating in a postinfectious cohort study who developed CF 6 months after an acute EBV infection were eligible for the present study. A combined CBT and music therapy programme (10 therapy sessions and related homework) was compared with care as usual in a randomised controlled design. Therapists and participants were blinded to outcome evaluation. Endpoints included physical activity (steps/day), symptom scores, recovery rate and possible harmful effects, but the study was underpowered regarding efficacy. Total follow-up time was 15 months. Power analyses suggested that 120 participants would be needed in order to detect a moderate effect size.

RESULTS

A total of 91 individuals with postinfectious CF were eligible, and a total of 43 were included (21 intervention group, 22 control group). Concern regarding school absence due to therapy sessions was the main reason for declining participation. Seven individuals left the study during the first 3 months, leaving 15 in the intervention group and 21 in the control group at 3 months follow-up. No harmful effects were recorded, and compliance with appointment was high. In intention-to-treat analyses, the primary endpoint (number of steps/day) did not differ significantly between the intervention group and the control group (difference (95% CI) =-1298 (-4874 to 2278)). Secondary outcome measures were also not significantly different among the two groups.

CONCLUSION

An intervention study of combined CBT and music therapy in postinfectious CF is feasible. A fully powered trial is needed to evaluate efficacy; participants' concern regarding school absence should be properly addressed to secure recruitment.

TRIAL REGISTRATION NUMBER

ClinicalTrials ID: NCT02499302, registered July 2015.

Frequency of reported pain in adult males with muscular dystrophy

INTRODUCTION

The purpose of this study was to present and compare pain between adult males with Duchenne (DMD), Becker's (BMD), Limb-Girdle (LGMD) Facioscapulohumeral (FSHD) forms of Muscular Dystrophy (MD), and healthy controls (CTRL), using three different methods of assessment.

METHODS

Pain was assessed using 1) a whole body visual analogue scale (VAS) of pain, 2) a generalised body map and 3) a localised body map.

RESULTS

All types of MD reported more VAS pain than CTRL, with 97% of all MD participants reporting pain; however, no differences were reported between types of MD. The generalised body map approach identified more frequent pain in the shoulders of FSHD (93%) than other groups (13-43%), hips of DMD (87%) and LGMD (75%) than other groups (0-29%), and legs of all MD (64-78%) than CTRL (25%). The localised body map approach identified common areas of frequent pain across types of MD, posterior distal leg and distal back, as well as condition specific regions of frequent pain, for example posterior trapezius in FSHD, and anterior hip pain in DMD and LGMD.

CONCLUSIONS

Using a single pain value (VAS), increased pain was reported by adults with MD compared to CTRL, with no clear differences between different MD groups, suggesting pain is symptomatic of MD. The use of the generalised body map approach, and to an even greater extent the localised body map approach, identified specific areas of frequent pain relevant to each individual condition. These results indicate that whist the commonly used generalised approach can be used to identify broad anatomical regions, the localised approach provides a more comprehensive understanding of pain, reflective of clinical assessment, and should be utilised in future research.

Physical exertion exacerbates decline in the musculature of an animal model of Duchenne muscular dystrophy

Duchenne muscular dystrophy (DMD) is a genetic disorder caused by loss of the protein dystrophin. In humans, DMD has early onset, causes developmental delays, muscle necrosis, loss of ambulation, and death. Current animal models have been challenged by their inability to model the early onset and severity of the disease. It remains unresolved whether increased sarcoplasmic calcium observed in dystrophic muscles follows or leads the mechanical insults caused by the muscle's disrupted contractile machinery. This knowledge has important implications for patients, as potential physiotherapeutic treatments may either help or exacerbate symptoms, depending on how dystrophic muscles differ from healthy ones. Recently we showed how burrowing dystrophic (dys-1) C. elegans recapitulate many salient phenotypes of DMD, including loss of mobility and muscle necrosis. Here, we report that dys-1 worms display early pathogenesis, including dysregulated sarcoplasmic calcium and increased lethality. Sarcoplasmic calcium dysregulation in dys-1 worms precedes overt structural phenotypes (e.g., mitochondrial, and contractile machinery damage) and can be mitigated by reducing calmodulin expression. To learn how dystrophic musculature responds to altered physical activity, we cultivated dys-1 animals in environments requiring high intensity or high frequency of muscle exertion during locomotion. We find that several muscular parameters (e.g., size) improve with increased activity. However, longevity in dystrophic animals was negatively associated with muscular exertion, regardless of effort duration. The high degree of phenotypic conservation between dystrophic worms and humans provides a unique opportunity to gain insight into the pathology of the disease as well as the initial assessment of potential treatment strategies.

Psychosocial Management of the Patient With Duchenne Muscular Dystrophy

In this article, we outline a comprehensive plan for the psychosocial management of patients with Duchenne muscular dystrophy (DMD) across the life span. In 2010, the Centers for Disease Control and Prevention sponsored the development of multidisciplinary management guidance for DMD, and in 2018, that guidance was updated. In the intervening years, a new emphasis was placed on studying and addressing the psychosocial issues that affect patients with DMD, driven in part by improved patient survival. Once viewed as ancillary to managing the significant medical needs of patients with DMD, it is now standard practice to integrate psychosocial management into the multidisciplinary management of the disease. It is also increasingly recognized that neurodevelopmental disorders in DMD occur at a higher rate than what was previously understood and that these disorders warrant early and intensive intervention. In this article, we expand on the content found in the 2018 DMD Care Considerations.

Psychometric properties of the brief pain inventory modified for proxy report of pain interference in children with cerebral palsy with and without cognitive impairment

Introduction

Cerebral palsy (CP) is the most common cause of physical disability in children and is often associated with secondary musculoskeletal pain. Cerebral palsy is a heterogeneous condition with wide variability in motor and cognitive capacities. Although pain scales exist, there remains a need for a validated chronic pain assessment tool with high clinical utility for use across such a heterogeneous patient population with and without cognitive impairment.

Objectives

The purpose of this study was an initial assessment of several psychometric properties of the 12-item modified brief pain inventory (BPI) pain interference subscale as a proxy-report tool in a heterogeneous sample of children with CP with and without cognitive impairment.

Methods

Participants (n = 167; 47% male; mean age = 9.1 years) had pain assessments completed through caregiver report in clinic before spasticity treatment (for a subgroup, the modified BPI was repeated after procedure). To measure concurrent validity, we obtained pain intensity ratings (Numeric Rating Scale of pain) and pain intensity, duration, and frequency scores (Dalhousie Pain Interview).

Results

Modified BPI scores were internally consistent (Cronbach α = 0.96) and correlated significantly with Numeric Rating Scale intensity scores (rs = 0.67, P < 0.001), Dalhousie Pain Interview pain intensity (rs = 0.65, P < 0.001), pain frequency (rs = 0.56, P = 0.02), and pain duration scores (rs = 0.42, P = 0.006). Modified BPI scores also significantly decreased after spasticity treatment (pretest [scored 0-10; 3.27 ± 2.84], posttest [2.27 ± 2.68]; t (26) = 2.14, 95% confidence interval [0.04-1.95], P = 0.04).

Conclusion

Overall, the modified BPI produced scores with strong internal consistency and that had concurrent validity as a proxy-report tool for children with CP.

Chronic pain prevalence and associated factors in adolescents with and without physical disabilities

AIM

Adolescents with physical disabilities may have co-occurring chronic pain, but the prevalence and specific associated factors are unknown. The aims of this study were to determine (1) the prevalence of chronic pain in adolescents with physical disabilities and (2) whether known correlates of chronic pain in the general population are also present in young people both with physical disability and with chronic pain relative to peers.

METHOD

We conducted a secondary analysis of cross-sectional nationally representative data from the National Longitudinal Study of Adolescent to Adult Health. Multivariate linear regression analysis was used to identify demographic and psychosocial factors associated with chronic pain.

RESULTS

A total of 989 (4.3%) adolescents reported physical disabilities. They had a significantly higher rate of pain (27.2%) compared with able-bodied peers (15.6%, χ² =86.3550, p<0.001). There was no significant interaction between physical disability status and chronic pain in relation to depressive symptoms, anxiety, or insomnia.

INTERPRETATION

Adolescents with physical disabilities experience chronic pain at a significantly higher rate than able-bodied peers, but the comorbidity of physical disability and chronic pain is not related to depression, anxiety, or insomnia. Evaluation of chronic pain and tailored pain interventions need to be developed for this population.

WHAT THIS PAPER ADDS

Chronic pain and its correlates are important problems for adolescents with physical disabilities. These adolescents present with higher rates of chronic pain than other young people. Chronic pain is associated with increased levels of depressive symptoms, anxiety, and insomnia regardless of disability status.

Modelling the factor structure of the Child Depression Inventory in a population of apparently healthy adolescents in Nigeria

Background

Childhood and adolescent depression is common and often persists into adulthood with negative implications for school performances, peer relationship and behavioural functioning. The Child Depression Inventory (CDI) has been used to assess depression among adolescents in many countries including Nigeria but it is uncertain if the theoretical structure of CDI appropriately fits the experiences of adolescents in Nigeria. This study assessed varying theoretical modelling structure of the CDI in a population of apparently healthy adolescents in Benue state, Nigeria.

Methods

Data was extracted on CDI scale and demographic information from a total of 1, 963 adolescents (aged 10–19 years), who participated in a state wide study assessing adolescent psychosocial functioning. In addition to descriptive statistics and reliability tests, Exploratory Factor Analysis (EFA) and Confirmatory Factor analysis (CFA) were used to model the underlying factor structure and its adequacy. The suggested new model was compared with existing CDI models as well as the CDI’s original theoretical model. A model is considered better, if it has minimum Root Mean Square Error of Approximation (RMSEA<0.05), Minimum value of Discrepancy (CMIN/DF<3.0) and Akaike information criteria. All analyses were performed at 95% confidence level, using the version 21 of AMOS and the R software.

Results

Participants were 14.7±2.1 years and mostly male (54.3%), from Monogamous homes (67.9%) and lived in urban areas (52.2%). The measure of the overall internal consistency of the 2-factor CDI was α = 0.84. The 2-factor model had the minimum RMSEA (0.044), CMIN/DF (2.87) and least AIC (1037.996) compared to the other five CDI models.

Conclusion

The child depression inventory has a 2-factor structure in a non-clinical general population of adolescents in Nigeria. Future use of the CDI in related setting may consider the 2-factor model.

The role of perceived family social support and parental solicitous responses in adjustment to bothersome pain in young people with physical disabilities

PURPOSE

Family social support and parental solicitous responses have been hypothesised to play an important role in paediatric pain. However, research testing the hypothesised associations between these social domains and measures of adjustment to pain in youths with disabilities and chronic pain is non-existent.

METHODS

About 111 youths with physical disabilities and bothersome pain were interviewed and asked to complete measures of average pain intensity, pain interference, family social support, parent solicitous responding, and catastrophising.

RESULTS

Children's perceptions of pain-related solicitous responses from their parent/guardian were associated both with more pain interference and greater pain-related catastrophising; perceived social support was negatively associated with pain interference.

CONCLUSIONS

The findings provide new information regarding the role that psychosocial factors have in predicting function and adjustment, and have important implications as to how youth with physical disabilities with pain might be most effectively treated. Implications for rehabilitation Little is known about the role of perceived family social support or parental solicitous responses in the adjustment to chronic pain in young people with physical disabilities. This study provides new and important findings that have significant theoretical and practical implications that could help to understand and manage function in these patients. Results show that it matters how parents respond to their children with disabilities who have pain, and raise the possibility that interventions which target these responses may result in significant benefits for the children.

Pain Beliefs and Quality of Life in Young People With Disabilities and Bothersome Pain

OBJECTIVES

Pain beliefs have been hypothesized to play an important role in pediatric pain. However, research examining the associations between pain-related beliefs and measures of function in youths with disabilities is limited.

METHODS

In total, 84 youths (mean age, 14.26 y; SD, 3.27) with physical disabilities who indicated they also had bothersome pain were interviewed and asked to rate their average pain intensity in the past week and to complete measures of pain-related beliefs and health-related quality of life.

RESULTS

A number of pain beliefs were associated with different physical and psychosocial function domains, although different beliefs appeared to play different roles, depending on the function domain examined. Across all of the health-related quality-of-life domains studied, a belief that pain is influenced by one's emotions was associated with lower levels of function. No differences were found in pain beliefs related to age. In addition, a small difference in pain beliefs was found for sex; specifically, girls were more likely than boys to endorse the belief that pain is influenced by emotions.

DISCUSSION

The findings provide new information regarding the role that pain beliefs have in predicting function and have important clinical implications regarding how youth with physical disabilities and pain might be most effectively treated.

Back Pain Prevalence Is Associated With Curve-type and Severity in Adolescents With Idiopathic Scoliosis: A Cross-sectional Study

STUDY DESIGN

A cross-sectional study.

OBJECTIVES

The aim of this study was to investigate spinal pain prevalence in adolescents with idiopathic scoliosis (AIS) and to explore associations between pain intensity and pain-related disability with scoliosis site, severity, and spinal bracing.

SUMMARY OF BACKGROUND DATA

The causal link between spinal pain and AIS remains unclear. Spinal asymmetry has been recognized as a back pain risk factor, which is a known cause of care-seeking in adolescents.

METHODS

Participants were recruited from an outpatient tertiary-care scoliosis clinic. Pain intensity and pain-related disability were measured by the Brief Pain Inventory questionnaire and the Roland-Morris Disability Questionnaire. Scoliosis severity estimation was performed using Cobb angles. Associations were explored using multiple linear regressions and reported with unstandardized beta coefficients (β) adjusted for age and sex.

RESULTS

We recruited 500 patients (85% female) with mean (SD) age of 14.2 (1.8) years. Means (SD) of thoracic and lumbar Cobb angle were 24.54(9.77) and 24.13 (12.40), respectively. Spinal pain prevalence was 68% [95% confidence interval (95% CI): 64.5-72.4] with a mean intensity of 1.63 (SD, 1.89). Spinal pain intensity was positively associated with scoliosis severity in the main thoracic (P = 0.003) and lumbar (P = 0.001) regions. The mean (SD) disability score was 1.73 (2.98). Disability was positively associated with scoliosis severity in the proximal thoracic (P = 0.035), main thoracic (P = 0.000), and lumbar (P = 0.000) regions.Spinal bracing was associated with lower spinal pain intensity in the thoracic (P = 0.000) and lumbar regions (P = 0.009). Bracing was also related with lower disability for all spinal areas (P < 0.045).

CONCLUSION

Spinal pain is common among patients with AIS, and greater spinal deformity was associated with higher pain intensity. These findings should inform clinical decision-making when caring for patients with AIS.

LEVEL OF EVIDENCE

3.

Defining mild, moderate, and severe pain in young people with physical disabilities

PURPOSE

The purpose of this study is to identify the cutoffs that are most suitable for classifying average and worst pain intensity as being mild, moderate, or severe in young people with physical disabilities.

METHOD

Survey study using a convenience sample of 113 young people (mean age = 14.19; SD = 2.9; age range: 8-20) with physical disabilities (namely, spinal cord injury, cerebral palsy, spina bifida, limb deficiency (acquired or congenital), or neuromuscular disease).

RESULTS

The findings support a non-linear association between pain intensity and pain interference. In addition, the optimal cutoffs for classifying average and worst pain as mild, moderate, or severe differed. For average pain, the best cutoffs were the following: 0-3 for mild, 4-6 for moderate, and 7-10 for severe pain, whereas the optimal classification for worst pain was 0-4 for mild, 5-6 for moderate, and 7-10 for severe pain.

CONCLUSIONS

The findings provide important information that may be used to help make decisions regarding pain treatment in young people with disabilities and also highlight the need to use different cutoffs for classifying pain intensity in young people with disabilities than those that have been suggested for adults with chronic pain. Implications for rehabilitation Most clinical guidelines make treatment recommendations based on classifications of pain intensity as being mild, moderate, and severe that do not have a clear cut association with pain intensity ratings. Cutoffs that are deemed to be the most appropriate for classifying pain intensity as mild, moderate, and severe appear to depend, at least in part, on the pain population that is being studied and pain domain that is being used. This work helps to advance our knowledge regarding the meaning of pain intensity ratings in young people with physical disabilities. Clinicians can use this information to make empirically guided decisions regarding when to intervene in young people with disabilities and chronic pain.

A rare presentation of meralgia paraesthetica in limb girdle muscular dystrophy

A 44-year-old female with paraesthesia and pain on the left anterolateral thigh who had been diagnosed with limb-girdle muscular dystrophy by electromyography and muscle biopsy is presented. Neurological examination revealed atrophy of the proximal muscles of both shoulders, plus pseudo hypertrophy of both calves. Electromyography exhibited a myopathic pattern. Musculoskeletal ultrasound imaging demonstrated a fusiform nerve swelling below the inguinal ligament suggesting lateral femoral cutaneous nerve compression, consistent with meralgia paraesthetica. Treatment with a perineural injection of betamethasone dipropionate and betamethasone sodium phosphate combination, and prilocaine-HCl, under ultrasound guidance, was performed. Symptoms resolved within 6 h. At 3-week follow-up, the patient was asymptomatic, and there was no paraesthesia or pain on examination. In this case, ultrasound-guided perineural injection of the lateral femoral cutaneous nerve with local anaesthetics and steroid served both diagnostic and therapeutic functions.

Clinical features of children and adults with a muscular dystrophy using powered indoor/outdoor wheelchairs: disease features, comorbidities and complications of disability. Disabil Rehabil 2017;40:1007-1013. [PMID: 28338349 DOI: 10.1080/09638288.2017.1292322]

PURPOSE

To describe the clinical features of electric powered indoor/outdoor wheelchair users with a muscular dystrophy, likely to influence optimal prescription; reflecting features of muscular dystrophies, conditions secondary to disability, and comorbidities impacting on equipment provision.

METHODS

Cross-sectional retrospective case note review of recipients of electric powered indoor/outdoor wheelchairs provided by a specialist regional wheelchair service. Data on demography, diagnostic/clinical, and wheelchair prescription were systematically extracted.

RESULTS

Fifty-one men and 14 women, mean age 23.7 (range 10-67, s.d. 12.95) years, were studied. Forty had Duchenne muscular dystrophy, 22 had other forms of muscular dystrophy, and three were unclassified. Twenty-seven were aged under 19. Notable clinical features included problematic pain (10), cardiomyopathy (5), and ventilatory failure (4). Features related to disability were (kypho)scoliosis (20) and edema/cellulitis (3) whilst comorbidities included back pain (5). Comparison of younger with older users revealed younger users had more features of muscular dystrophy affecting electric powered chair provision (56%) whilst older users had more comorbidity (37%). Tilt-in-space was prescribed for 81% of users, specialized seating for 55% and complex controls for 16%.

CONCLUSIONS

Muscular dystrophy users were prescribed electric powered indoor/outdoor chairs with many additional features reflecting the consequences of profound muscle weakness. In addition to facilitating independence and participation, electric powered indoor/outdoor chairs have major therapeutic benefits. Implications for rehabilitation Powered wheelchairs have therapeutic benefits in managing muscular dystrophy pain and weakness. The use of specialized seating needs careful consideration in supporting progressive muscle weakness and the management of scoliosis. Pain, discomfort, pressure risk, and muscle fatigue may be reduced by use of tilt-in-space.

Pain extent and function in youth with physical disabilities

Background

The aim of this study was to increase our understanding of the role that spatial qualities of pain (location and extent) play in functioning, among youths with disabilities and chronic pain.

Methods

One-hundred and fifteen youths (mean age 14.4 years; SD ±3.3 years) with physical disabilities and chronic pain were interviewed and were asked to provide information about pain locations and their average pain intensity in the past week, and to complete measures of pain interference, psychological function and disability. Most of the participants in this sample were males (56%), Caucasian (68%), and had a cerebral palsy (34%) or muscular dystrophy (25%) problem. Most participants did not report high levels of disability ( X¯=12.7, SD ±9.5, range 0–60) or global pain intensity ( X¯=3.2, SD ±2.4, range 0–10).

Results

Pain at more than one body site was experienced by 91% of participants. There were positive associations between pain extent with pain interference (r = 0.30) and disability (r = 0.30), and a negative association with psychological function (r = –0.38), over and above average pain intensity. Additionally, pain intensity in the back (as opposed to other locations) was associated with more pain interference (r = 0.29), whereas pain intensity in the shoulders was associated with less psychological function (r = –0.18), and pain intensity in the bottom or hips was associated with more disability (r = 0.29).

Conclusion

The findings support the need to take into account pain extent in the assessment and treatment of youths with physical disabilities and chronic pain, call our attention about the need to identify potential risk factors of pain extent, and develop and evaluate the benefits of treatments that could reduce pain extent and target pain at specific sites.

Psychometric properties of the short form of the Children's Depression Inventory (CDI-S) in young people with physical disabilities

OBJECTIVE

Depression is a significant issue for young people with physical disabilities. Efficient and reliable questionnaires are needed to evaluate and monitor the efficacy of depression treatments in this population. The aim of this study was to evaluate the reliability and validity of the 10-item version of the Children's Depression Inventory (CDI-S) in a sample of young people with physical disabilities.

METHODS

A convenience sample of young people with physical disabilities (N=97) was recruited and interviewed. Reliability was evaluated using the Cronbach's α and examining the item-total correlations. Validity was evaluated by computing Pearson correlations between scores on the CDI-S and measures of pain and psychological functioning (anxiety and depression).

RESULTS

The CDS-I items loaded on a single factor. The internal consistency of the scale was good (Cronbach's α=0.84) and the CDI-S showed moderate significant correlations with pain intensity (r=0.29), pain interference (r=0.46) and psychological functioning (r=-0.57). Two of the items, however, did not perform well (i.e., item-total correlations <0.3, and Cronbach's α improved when they were deleted).

CONCLUSION

The findings support the reliability and validity of the CDI-S scores for use in young people with physical disabilities. The measure's psychometric properties should be studied in larger samples. In addition, there is a new brief version of the CDI (CDI-S 2) that needs to be evaluated in order to determine which of the two scales is better for assessing depression in young people with physical disabilities.

Pain in Neurodegenerative Disease: Current Knowledge and Future Perspectives

Neurodegenerative diseases are going to increase as the life expectancy is getting longer. The management of neurodegenerative diseases such as Alzheimer's disease (AD) and other dementias, Parkinson's disease (PD) and PD related disorders, motor neuron diseases (MND), Huntington's disease (HD), spinocerebellar ataxia (SCA), and spinal muscular atrophy (SMA), is mainly addressed to motor and cognitive impairment, with special care to vital functions as breathing and feeding. Many of these patients complain of painful symptoms though their origin is variable, and their presence is frequently not considered in the treatment guidelines, leaving their management to the decision of the clinicians alone. However, studies focusing on pain frequency in such disorders suggest a high prevalence of pain in selected populations from 38 to 75% in AD, 40% to 86% in PD, and 19 to 85% in MND. The methods of pain assessment vary between studies so the type of pain has been rarely reported. However, a prevalent nonneuropathic origin of pain emerged for MND and PD. In AD, no data on pain features are available. No controlled therapeutic trials and guidelines are currently available. Given the relevance of pain in neurodegenerative disorders, the comprehensive understanding of mechanisms and predisposing factors, the application and validation of specific scales, and new specific therapeutic trials are needed.

Acceptance and commitment therapy in youth with neurofibromatosis type 1 (NF1) and chronic pain and their parents: A pilot study of feasibility and preliminary efficacy

Neurofibromatosis type 1 (NF1) is an autosomal dominant genetic disorder affecting about 1 in 3,500 individuals. Chronic pain is commonly reported among individuals with NF1 and plexiform neurofibroma tumors (PNs). Acceptance and Commitment Therapy (ACT), an empirically supported method for addressing chronic pain, helps individuals re-focus on valued relationships and activities. This pilot study investigated the feasibility and preliminary efficacy of a brief ACT workshop in the NF1 population. Eligible participants included adolescents and young adults (AYA; 12-21 years) with NF1 and chronic pain that interfered with daily functioning and their parents. Patients and parents completed baseline measures of pain interference, pain intensity, functional disability, pain acceptance, depression, and anxiety. Then, AYA and parents participated separately in a 2-day small-group ACT workshop. A telephone booster session occurred 1 month post-intervention. Three-month post-treatment measures were completed by mail. Ten adolescents (4 males; M age = 16.9 years) and seven parents provided baseline and 3-month data. Mean satisfaction with the study was moderate to high (3.9 for patients and 4.6 for parents on a 1-5 scales). Patients and parents reported significant declines in patients' pain interference at 3 months post-treatment. Patient-reported pain intensity significantly declined from baseline to 3 months. Parents reported marginally greater acceptance of their child's pain. No changes emerged in functional ability or mood. Preliminary findings suggest that a brief ACT group intervention is feasible and may help AYA with NF1 and PNs cope with their chronic pain, although larger randomized studies are needed to confirm treatment efficacy. © 2016 Wiley Periodicals, Inc.

Pain in adolescents with spinal muscular atrophy and Duchenne and Becker muscular dystrophy

BACKGROUND/PURPOSE

The purpose of this study was to explore the prevalence, nature and scope of pain in adolescents with spinal muscular atrophy and Duchenne and Becker muscular dystrophy and whether the pain differs between diagnostic groups or between adolescents with different ambulation status. Furthermore to study the consequences of pain and to identify pain-exacerbating and pain-relieving factors.

METHODS

In a national survey, fifty-five adolescents with spinal muscular atrophy and dystrophinopathy completed a questionnaire assessing pain frequency, duration, location using a body map, intensity and discomfort using visual analogue scales, pain interference using a modified version of Brief Pain Inventory and factors exacerbating and relieving pain.

RESULTS

Sixty-nine per cent of the adolescents reported pain during the past three months and 50% reported chronic pain. The pain prevalence did not differ significantly between diagnostic groups or between ambulators and non-ambulators. The average pain intensity was graded as mild and the worst pain as moderate. The pain typically occurred weekly, most frequently in the neck/back or legs. General activity and mood were the areas that were most affected by pain. Common pain-exacerbating factors were sitting, too much movement/activity and being lifted or transferred.

CONCLUSION

Pain is a frequent problem in adolescents with spinal muscular atrophy and dystrophinopathy. The assessments used enable an understanding both of the nature and scope of pain and of the impact of pain in everyday life. The study highlights the importance of assessing pain in a systematic manner and offering an individual approach to interventions designed to reduce pain in this population.

Validity of three rating scales for measuring pain intensity in youths with physical disabilities

BACKGROUND

There is growing evidence confirming that youths with physical disabilities are at risk for chronic pain. Although many scales for assessing pain intensity exist, it is unclear whether they are all equally suitable for youths. The aim of this study was to address this knowledge gap by comparing the validity of the Numerical Rating Scale (NRS-11), the Wong Baker FACES Pain Rating Scale (FACES), and a 6-point categorical Verbal Rating Scale (VRS-6) for assessing pain intensity among youths (aged 8-20) with physical disabilities.

METHODS

One hundred and thirteen youths (mean age = 14.19 years; SD = 2.9) were interviewed and asked to rate their current pain intensity and recalled (in the past week) worst, least, and average pain with the NRS-11 and the FACES. Participants were also asked to rate their average pain intensity during the past 4 weeks using a VRS-6, and were administered measures assessing pain interference, disability and psychological functioning.

RESULTS

Analyses showed that all of the pain intensity measures were associated positively with each other. Nevertheless, the NRS-11 appeared to out-perform both the VRS-6 and in particular the FACES scale with respect to: (1) the associations with the validity criterion (i.e. pain interference, disability and psychological functioning) and (2) a lack of any moderating effect of age on the association between the measure and the criterion variables.

CONCLUSIONS

The findings support the validity of the NRS-11 for assessing pain intensity in youths with physical disabilities between the ages of 8 and 20 years.

Development and validation of the English Pain Interference Index and Pain Interference Index-Parent report

OBJECTIVE

Measurement of pain interference in children is challenged by a lack of validated measures with a parent proxy report. This study investigated the psychometric properties of the Pain Interference Index (PII), a six-item questionnaire originally developed in Swedish, in chronically ill youth.

METHODS

We adapted the PII for English-speaking participants and created a parallel parent proxy measure. Respondents indicate how much pain has interfered with the child's life in the past 2 weeks (0-6 scale); higher scores indicate more pain interference. Eligible participants included individuals 6-25 years with neurofibromatosis type 1 (NF1) and cancer. Internal consistency was assessed; validity was examined by correlating PII scores with existing measures of pain interference (Modified Brief Pain Inventory [MBPI]) and pain intensity (visual analogue scale [VAS]), and with measures of disease severity.

RESULTS

Among 60 participants (mean age 14.7 years, range 6-24) and their parents, PII internal consistency was 0.84 and 0.96, respectively. PII scores correlated with MBPI (r = 0.81, P < 0.0001) and VAS (r = 0.55, P < 0.0001) scores and differentiated between patients with mild vs moderate/severe NF1 disease severity (P < 0.05). The PII-Parent was significantly correlated with the mothers' and fathers' VAS rating of the child's pain intensity (Ps < 0.01).

CONCLUSIONS

Internal consistency of the English PII is high; validity is supported by the PII's correlations with other measures of pain interference and pain intensity, and with disease severity in patients with NF1. Preliminary data indicate that the English PII is a reliable, valid, feasible pain interference measure for youth with NF1 and cancer.

Pharmacological treatment of chronic non-cancer pain in pediatric patients

Chronic pain in children and young adults occurs frequently and contributes to early disability as well as personal and familial distress. A biopsychosocial approach to evaluation and treatment is recommended. Within this approach, there is a role for pharmacologic intervention. A variety of medications are used for chronic pain conditions in pediatric patients. Medication classes include anticonvulsants, muscle relaxants, antidepressants, opioids, local anesthetics, and anti-inflammatory drugs. Data is sparse, and most medications are used without condition-specific approval by national regulatory agencies such as the Food and Drug Administration in the US and the European Medicines Agency. In the absence of evidence on which to base practice, optimal drug therapy decisions rest on understanding proposed mechanisms of pain conditions, extrapolation from adult data-when such exists, and empirical and experiential knowledge. Drug delivery systems have evolved, and practitioners have to decide amongst not only medication classes, but also routes of delivery. Opioids are not recommended for use by non-pain specialists for the treatment of pediatric chronic pain, and even then the issues are more complex than can be addressed here. This article reviews the major medications used for pediatric chronic pain conditions.

Pain and pressure pain thresholds in adolescents with chronic fatigue syndrome and healthy controls: a cross-sectional study

OBJECTIVES

Although pain is a significant symptom in chronic fatigue syndrome (CFS), pain is poorly understood in adolescents with CFS. The aim of this study was to explore pain distribution and prevalence, pain intensity and its functional interference in everyday life, as well as pressure pain thresholds (PPT) in adolescents with CFS and compare this with a control group of healthy adolescents (HC).

METHODS

This is a case-control, cross-sectional study on pain including 120 adolescents with CFS and 39 HCs, aged 12-18 years. We measured pain frequency, pain severity and pain interference using self-reporting questionnaires. PPT was measured using pressure algometry. Data were collected from March 2010 until October 2012 as part of the Norwegian Study of Chronic Fatigue Syndrome in Adolescents: Pathophysiology and Intervention Trial.

RESULTS

Adolescents with CFS had significantly lower PPTs compared with HCs (p<0.001). The Pain Severity Score and the Pain Interference Score were significantly higher in adolescents with CFS compared with HCs (p<0.001). Almost all adolescents with CFS experienced headache, abdominal pain and/or pain in muscles and joints. Moreover, in all sites, the pain intensity levels were significantly higher than in HCs (p<0.001).

CONCLUSIONS

We found a higher prevalence of severe pain among adolescents with CFS and lowered pain thresholds compared with HCs. The mechanisms, however, are still obscure. Large longitudinal population surveys are warranted measuring pain thresholds prior to the onset of CFS.

TRIAL REGISTRATION NUMBER

Clinical Trials, NCT01040429; The Norwegian Study of Chronic Fatigue Syndrome in Adolescents: Pathophysiology and Intervention Trial (NorCAPITAL) http://www.clinicaltrials.gov.

Pain location and intensity impacts function in persons with myotonic dystrophy type 1 and facioscapulohumeral dystrophy with chronic pain

INTRODUCTION

We examined the effects of pain site and intensity on function in patients with myotonic dystrophy type 1 (DM1) and facioscapulohumeral muscular dystrophy (FSHD) and chronic pain.

METHODS

Questionnaires assessing pain sites, pain extent (number of sites), pain intensity, and pain interference were completed by 182 individuals with DM1 (43%) or FSHD (57%) and chronic pain.

RESULTS

There was a positive association between pain extent and intensity with pain interference, and a negative association with psychological functioning in both DM1 and FSHD. Pain intensity at specific sites had differential impact beyond the effects of pain intensity alone. Head pain intensity independently affected psychological functioning, whereas leg, foot, hip, and knee pain contributed independently to the prediction of pain interference.

CONCLUSIONS

Pain site and intensity differentially modulates the effect of chronic pain on function in DM1 and FSHD patients. Researchers and clinicians should consider these factors when assessing and treating pain.

Symptom burden in persons with myotonic and facioscapulohumeral muscular dystrophy

OBJECTIVE

This study examines the prevalence of pain, fatigue, imbalance, memory impairment, and vision loss in persons with myotonic and facioscapulohumeral dystrophy and their association with functioning.

DESIGN

A survey (N = 170) included measures of severity (0-10 scales) and course of these symptoms as well as measures of social integration, home competency, mental health, and productive activity. Descriptive and regression analyses examined the associations between symptoms and functioning.

RESULTS

Fatigue (91%), imbalance (82%), and pain (77%) were the most commonly reported. The most severe symptom was fatigue (mean ± SD severity, 5.14 ± 2.81), followed by imbalance (4.95 ± 3.25). Symptoms were most likely to stay the same or worsen since onset. Controlling for potential medical and demographic confounds, symptoms were associated with 17% of the mental health variance, 10% of home competency, 10% of social integration, 16% of productive activity for myotonic dystrophy type 1, and 12% of productive activity for facioscapulohumeral muscular dystrophy.

CONCLUSIONS

Pain, fatigue, and imbalance are common in persons with muscular dystrophy. Interventions may be useful to mitigate their impact on functioning. Further research should examine these relationships to guide clinical practices.

Patterns of decline in upper limb function of boys and men with DMD: an international survey

With increasing life expectancy, upper extremity (UE) function becomes more and more important in boys with Duchenne muscular dystrophy (DMD). Knowledge of UE function in these children is, however, limited. The aim of this study was to gain insight into the changing patterns of UE function during the course of DMD. A Web-based questionnaire on UE function, covering all domains of the International Classification of Functioning Disability and Health, was distributed worldwide. Primary domains of the questionnaire were: participant characteristics, UE pain and stiffness, UE activities, and social participation. Data were described per disease stage and analyzed using descriptive analysis. A total of 213 boys/men with DMD (1-35 years) were included in this study. UE pain, stiffness, and activity limitations increased with disease stage. UE activity limitations already occurred in the early ambulatory stage. Compared to the healthy population, social participation was restricted in DMD patients and about 70% of the respondents experienced UE limitations when performing social activities. Despite the existence of UE impairments, only 9% of the respondents used supportive aids. Functional capacities and activities of the UE are limited already in the early ambulatory stage of patients with DMD affecting their social participation. Therefore, clinicians should pay attention to UE limitations before DMD patients lose their capacity to walk. Effective and adequate aids as well as attention for pain and stiffness in the therapeutic management could help to reduce UE activity limitations and related restrictions in social participation.