Theoretical Schemas to Guide Back Pain Consortium (BACPAC) Chronic Low Back Pain Clinical Research.

BACKGROUND: Chronic low back pain (cLBP) is a complex with a heterogenous clinical presentation. A better understanding of the factors that contribute to cLBP is needed for accurate diagnosis, optimal treatment, and identification of mechanistic targets for new therapies. The Back Pain Consortium (BACPAC) Research Program provides a unique opportunity in this regard, as it will generate large clinical datasets, including a diverse set of harmonized measurements. The Theoretical Model Working Group was established to guide BACPAC research and to organize new knowledge within a mechanistic framework. This article summarizes the initial work of the Theoretical Model Working Group. It includes a three-stage integration of expert opinion and an umbrella literature review of factors that affect cLBP severity and chronicity. METHODS: During Stage 1, experts from across BACPAC established a taxonomy for risk and prognostic factors (RPFs) and preliminary graphical depictions. During Stage 2, a separate team conducted a literature review according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines to establish working definitions, associated data elements, and overall strength of evidence for identified RPFs. These were subsequently integrated with expert opinion during Stage 3. RESULTS: The majority (∼80%) of RPFs had little strength-of-evidence confidence, whereas seven factors had substantial confidence for either a positive association with cLBP (pain-related anxiety, serum C-reactive protein, diabetes, and anticipatory/compensatory postural adjustments) or no association with cLBP (serum interleukin 1-beta / interleukin 6, transversus muscle morphology/activity, and quantitative sensory testing). CONCLUSION: This theoretical perspective will evolve over time as BACPAC investigators link empirical results to theory, challenge current ideas of the biopsychosocial model, and use a systems approach to develop tools and algorithms that disentangle the dynamic interactions among cLBP factors.

A Conversation Between Past and Present Chairs of the American Board of Physical Medicine and Rehabilitation: Four Decades of History and the Future of Board Certification.

ABSTRACT: On the 75th anniversary of the founding of the American Board of Physical Medicine and Rehabilitation, 11 of the surviving chairs of the board convened virtually to reflect on the past 40 years of major trends for the accrediting body of physiatrists. The field rapidly expanded in the 1980s, driven by changes in the reimbursement environment. This rapid expansion drove an improvement in the caliber of residents choosing the field and in the quality of training programs. As physical medicine and rehabilitation evolved from a small- to medium-sized specialty, the board addressed many challenges: securing a credible position within the American Board of Medical Specialties; addressing a rising demand for subspecialty certification; improving training and exposure to physiatry; enhancing the quality of the accreditation process; and reducing the burden of accreditation on diplomates. The future development of physiatry includes improving diversity, equity, and inclusion, while restoring provider morale, well-being, and meaningfulness in work. Although challenges remain, physiatry as a field has grown to be well established through the board's efforts and respected within the larger medical community.

Is Sleep Disordered Breathing Confounding Rehabilitation Outcomes in Spinal Cord Injury Research?

The purpose of this article is to highlight the importance of considering sleep-disordered breathing (SDB) as a potential confounder to rehabilitation research interventions in spinal cord injury (SCI). SDB is highly prevalent in SCI, with increased prevalence in individuals with higher and more severe lesions, and the criterion standard treatment with continuous positive airway pressure remains problematic. Despite its high prevalence, SDB is often untested and untreated in individuals with SCI. In individuals without SCI, SDB is known to negatively affect physical function and many of the physiological systems that negatively affect physical rehabilitation in SCI. Thus, owing to the high prevalence, under testing, low treatment adherence, and known negative effect on the physical function, it is contended that underdiagnosed SDB in SCI may be confounding physical rehabilitation research studies in individuals with SCI. Studies investigating the effect of treating SDB and its effect on physical rehabilitation in SCI were unable to be located. Thus, studies investigating the likely integrated relationship among physical rehabilitation, SDB, and proper treatment of SDB in SCI are needed. Owing to rapid growth in both sleep medicine and physical rehabilitation intervention research in SCI, the authors contend it is the appropriate time to begin the conversations and collaborations between these fields. We discuss a general overview of SDB and physical training modalities, as well as how SDB could be affecting these studies.

Psychological Morbidity and Chronic Disease Among Adults With Traumatic Spinal Cord Injuries: A Longitudinal Cohort Study of Privately Insured Beneficiaries.

OBJECTIVE: To compare the longitudinal incidence of psychological morbidities and multimorbidity and estimates of chronic diseases among adults with spinal cord injuries (SCIs) as compared with adults without SCIs. METHODS: Privately insured beneficiaries who had medical coverage at any time between January 1, 2001, and December 31, 2017 were included if they had an International Classification of Diseases, Ninth Revision, Clinical Modification diagnostic code for a traumatic SCI (n=6,847). RESULTS: Adults with SCIs (n=6847) had a higher incidence of adjustment reaction (7.2% [n=493] vs 5.0% [n=42,862]), anxiety disorders (19.3% [n=1,322] vs 14.1% [n=120,872]), depressive disorders (29.3% [n=2,006] vs 9.3% [n=79,724]), alcohol dependence (2.4% [n=164] vs 1.0% [n=8,573]), drug dependence (2.3% [n=158] vs 0.8% [n=6,858]), psychogenic pain (1.0% [n=69] vs 0.2% [n=1,715]), dementia (6.5% [n=445] vs 1.5% [n=12,859]), insomnia (10.9% [n=746] vs 7.2% [n=61,722]), and psychological multimorbidity (37.4% [n=2,561] vs 23.9% [n=204,882]) as compared with adults without SCIs (n=857,245). The adjusted hazard ratios (HRs) of each psychological outcome were significantly higher for individuals with SCI and ranged from 1.18 (95% CI, 1.08-1.29) for anxiety disorders to 3.32 (95% CI, 1.93-5.71) for psychogenic pain. Adults with SCIs also had a significantly higher prevalence of all chronic diseases and chronic disease multimorbidity (51.1% vs 14.1%), except human immunodeficiency virus infection/AIDS. After propensity matching for age, education, race, sex, and chronic diseases (n=5884 matched pairs), there was still a significantly higher incidence of most psychological disorders and psychological multimorbidity among adults with SCIs. CONCLUSION: Adults with traumatic SCIs experienced an increased incidence of psychological morbidities and multimorbidity as compared with adults without SCIs. Clinical efforts are needed to improve mental health screening and targeted interventions to reduce the risk for psychological disease onset in the traumatic SCI population.

Psychological morbidity and chronic disease among adults with nontraumatic spinal cord injuries: a cohort study of privately insured beneficiaries.

BACKGROUND: Individuals living with a spinal cord injury (SCI) are at heightened risk for a number of chronic health conditions such as secondary comorbidities that may develop or be influenced by the injury, the presence of impairment, and/or the process of aging. However, very little is known about the development of secondary comorbidities among individuals living with nontraumatic SCIs (NTSCIs). PURPOSE: The objective of this study was to compare the prevalence of psychological morbidities and chronic diseases among adults with and without NTSCIs. DESIGN: Cross-sectional cohort from a nationwide insurance claims database. METHODS: Privately insured beneficiaries were included if they had an ICD-9-CM diagnostic code for a NTSCI and accompanying diagnosis of paraplegia, tetraplegia, quadriplegia, or unspecified paralysis (n=10,006). Adults without SCIs were also included (n=779,545). Prevalence estimates of common psychological morbidities, chronic diseases, and multimorbidity (≥2 conditions) were compared. RESULTS: Adults with NTSCIs had a higher prevalence of adjustment reaction (11.4% vs 5.1%), anxiety disorders (23.7% vs 14.5%), depressive disorders (31.6% vs 9.6%), drug dependence (3.4% vs 0.8%), episodic mood disorders (15.9% vs 5.4%), central pain syndrome (1% vs 0%), psychogenic pain (1.9% vs 0.2%), dementia (5.2% vs 1.5%), and psychological multimorbidity (29.3% vs 11.6%), as compared to adults without SCIs. The adjusted odds of psychological multimorbidity were 1.86 (95% confidence interval: 1.76-2.00). Adults with NTSCIs also had a significantly higher prevalence of all chronic diseases and chronic disease multimorbidity (73.5% vs 18%), except HIV/AIDS. After propensity matching for age, education, race, sex, and the chronic diseases (n=7,419 matched pairs), there was still a higher prevalence of adjustment reaction (9.2% vs 5.4%), depressive symptoms (23.5% vs 16.0%), central pain syndrome (1% vs 0%), psychogenic pain (1.5% vs 0.3%), and psychological multimorbidity (20.2% vs 17.4%) among adults with NTSCIs. CONCLUSIONS: Adults with NTSCIs have a significantly increased prevalence of psychological morbidities, chronic disease, and multimorbidity, as compared to adults without SCIs. Efforts are needed to facilitate the development of improved clinical screening algorithms and early interventions to reduce risk of disease onset/progression in this higher risk population.

Should There Be A Part II ABPMR Examination?: A Psychometric Inquiry.

BACKGROUND: Certification by the American Board of Physical Medicine and Rehabilitation (ABPMR) requires passing both a written multiple choice examination (Part I) and an oral examination (Part II), but it has been unclear whether the two examinations measure the same or different dimensions of knowledge. OBJECTIVE: To evaluate the concordance between the Part I and Part II examinations for ABPMR initial certification with regard to candidate performance on the examinations and their subsets. Our question is whether the Part II examination provides additional assessment of a candidate beyond what Part I provides. DESIGN: Retrospective psychometric evaluation of deidentified board examination scores. SETTING: ABPMR database of Part I and Part II examination scores. PARTICIPANTS: Candidates for the ABPMR Part I and Part II examinations after 2005, with a more detailed analysis of candidates for the Part I examination from 2014 to 2016. Examination scores of candidates who took the Part II examination both before and after the examination was standardized in 2005 were also used for an additional analysis. METHODS: Correlations, simple linear regressions, and principal components analysis. MAIN OUTCOME MEASUREMENTS: Correlation coefficients, variance analysis, and unexplained variance in the principal components analysis. RESULTS: There is a weak to moderate correlation between performance on the Part I and Part II examinations: r = 0.33, P < .001. There is an additional dimension of assessment that is demonstrated on the Part II examination, with this being primarily in the domains of systems-based practice and interpersonal communication skills. CONCLUSION: The Part I and Part II examinations, although with some overlap, contribute different and meaningful components to the overall evaluation of candidates for board certification in PM&R. LEVEL OF EVIDENCE: III.

Burnout in Diplomates of the American Board of Physical Medicine and Rehabilitation-Prevalence and Potential Drivers: A Prospective Cross-Sectional Survey.

BACKGROUND: Physician burnout is of growing concern. Burnout among physical medicine and rehabilitation (PM&R) physicians has shown a significant increase, positioning PM&R as one of the most "burned out" of specialties. Little has been written about potential factors contributing to physiatrist burnout or potential interventions. OBJECTIVE: To determine the prevalence of burnout among physiatrists and identify risk factors for burnout and potential strategies to decrease burnout among physiatrists. DESIGN: Prospective cross-sectional survey. SETTING: National survey of board certified physiatrists. PARTICIPANTS: One thousand five hundred thirty-six physiatrists certified by the American Board of PM&R. OUTCOME: The Mini-Z Burnout Survey, 1 question from the Maslach Burnout Scale on callousness toward patients, and several potential drivers of burnout. The probability of burnout, identified by question 3 on the Mini-Z, was the dependent variable. Other questions on the Mini-Z were explored as independent variables using logistic regression. RESULTS: Seven hundred seventy physiatrists (50.7%) fulfilled the definition of burnout. Only 38% of physiatrists reported not becoming more callous toward patients. The top 3 causes of burnout identified by physiatrists were increasing regulatory demands, workload and job demands, and practice inefficiency and lack of resources. Higher burnout rate was associated with high levels of job stress and working more hours per week. Lower burnout rates were associated with higher job satisfaction, control over workload, professional values aligned with those of department leaders, and sufficient time for documentation. There was no significant association between burnout and sex, years in practice, practice focus, or practice area. CONCLUSION: Burnout is a significant problem among PM&R physicians and is pervasive throughout the specialty. Opportunities exist to address major contributing drivers of burnout relating to practice patterns and efficiency of care within PM&R. These opportunities are, to varying degrees, under the control of hospital leaders, practice administrators, and practitioners.

Administration and performance on the Spinal Cord Injury Medicine Certification Examination over a 10-year period.

Context/Objective: The examination for Spinal Cord Injury (SCI) Medicine subspecialty certification has been administered since 1998, but published information about exam performance or administration is limited. Design: Retrospective review Setting/Participants: We examined de-identified information from the American Board of Physical Medicine and Rehabilitation (ABPMR) database for characteristics and performance of candidates (n = 566) who completed the SCI Medicine Examination over a 10-year period (2005-2014), during which the exam outline and passing standard remained consistent. Interventions: Not applicable Outcome Measures: We analysed candidate performance by candidate track, primary specialty, number of attempts, and domains being tested. We also examined candidate perception of the SCI Medicine Exam by analysing responses to a survey taken after exam completion. Results: Thirty-six percent of candidates who completed the exam during the study period took it for initial certification (23% in the fellowship track and 13% in the practice track offered during the initial "grandfathering" period) and 64% took it for maintenance of certification (MOC) in SCI Medicine. Factors associated with better exam performance included primary specialty certification in Physical Medicine and Rehabilitation (PM&R) and first attempt at passing the exam. For PM&R candidates, ABPMR Part I Examination scores and SCI Medicine Examination scores were strongly correlated. Candidate feedback about the exam was largely positive with 97% agreeing or strongly agreeing that it was relevant to the field and 90% that it was a good test of their knowledge. Conclusion: This study can inform prospective candidates for the SCI Medicine Examination as well as those guiding them. It may also provide useful information for future exam development.

Positive airway pressure therapy for sleep-disordered breathing confers short-term benefits to patients with spinal cord injury despite widely ranging patterns of use.

STUDY DESIGN: Prospective, cohort study. OBJECTIVES: To evaluate the effectiveness of bi-level positive airway pressure (PAP) therapy and the patterns of use for sleep-disordered breathing (SDB) in individuals with spinal cord injury (SCI). SETTING: Academic tertiary care center, USA. METHODS: Overall, 91 adults with C1-T6 SCI for ≥3 months were recruited and 74 remained in the study to be evaluated for SDB and follow-up. Individuals with SDB but no nocturnal hypercapnia (NH) were prescribed auto-titrating PAP. Those with NH were prescribed PAP with volume-assured pressure support. Device downloads and overnight transcutaneous capnography were performed at 3, 6, and 12 months to quantify PAP use and effectiveness. Participants kept daily event logs, and quality of life (QOL) questionnaires were performed after 3, 6, and 12 months. RESULTS: Overall, 45% of 91 participants completed the study. There was great diversity among SCI patients in PAP utilization; after 3 months, 37.8% of participants used PAP for ≥70% nights and ≥240 min per night, whereas 42.2% seldom used PAP and 20% used PAP sporadically or for short periods. PAP therapy was effective in improving OSA in 89% and nocturnal hypercapnia in 77%. Higher PAP pressures predicted higher levels of device use. There were marked reductions in symptoms of autonomic dysreflexia (AD) and orthostatic hypotension as well as some improved indices of QOL. CONCLUSIONS: Despite widely diverse patterns of use, PAP therapy may have short-term benefits with regard to QOL and reducing episodes of dizziness and autonomic dysreflexia.

Sleep disordered breathing in spinal cord injury: A systematic review.

CONTEXT: Spinal cord injury commonly results in neuromuscular weakness that impacts respiratory function. This would be expected to be associated with an increased likelihood of sleep-disordered breathing. OBJECTIVE: (1) Understand the incidence and prevalence of sleep disordered breathing in spinal cord injury. (2) Understand the relationship between injury and patient characteristics and the incidence of sleep disordered breathing in spinal cord injury. (3) Distinguish between obstructive sleep apnea and central sleep apnea incidence in spinal cord injury. (4) Clarify the relationship between sleep disordered breathing and stroke, myocardial infarction, metabolic dysfunction, injuries, autonomic dysreflexia and spasticity incidence in persons with spinal cord injury. (5) Understand treatment tolerance and outcome in persons with spinal cord injury and sleep disordered breathing. METHODS: Extensive database search including PubMed, Cochrane Library, CINAHL and Web of Science. RESULTS: Given the current literature limitations, sleep disordered breathing as currently defined is high in patients with spinal cord injury, approaching 60% in motor complete persons with tetraplegia. Central apnea is more common in patients with tetraplegia than in patients with paraplegia. CONCLUSION: Early formal sleep study in patients with acute complete tetraplegia is recommended. In patients with incomplete tetraplegia and with paraplegia, the incidence of sleep-disordered breathing is significantly higher than the general population. With the lack of correlation between symptoms and SDB, formal study would be reasonable. There is insufficient evidence in the literature on the impact of treatment on morbidity, mortality and quality of life outcomes.

Risk Factors Associated With Neurogenic Bowel Complications and Dysfunction in Spinal Cord Injury.

OBJECTIVES: To (1) assess the factors associated with methods of bowel management and bowel-related complications; and (2) determine the risk factors associated with bowel complications and overall bowel dysfunction, using multivariate modeling. DESIGN: Cross-sectional observational study. SETTING: A Spinal Cord Injury Model System, with additional participants recruited from other sites. PARTICIPANTS: Subjects (N=291) who incurred traumatic spinal cord injury (SCI) with resultant neurogenic bowel who were ≥5 years postinjury at the time of interview. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Constipation, bowel incontinence, and neurogenic bowel dysfunction questionnaire scores. These measures were all derived from the Bowel and Bladder Treatment Index. Data analyses included descriptive and bivariate statistics as well as logistic and linear regression modeling. RESULTS: Risk factors contributing to bowel incontinence included overall bowel dysfunction as measured by the neurogenic bowel dysfunction score, timing of bowel program, being married or having a significant other, urinary incontinence, constipation, and use of diuretics. Constipation was best predicted by age, race/ethnicity, using laxatives/oral medications, incomplete tetraplegia, frequency of bowel movements, abdominal pain, access to clinicians and caregivers, and history of bowel surgeries. Neurogenic bowel dysfunction scores were predicted by neurologic classification; use of laxatives, oral medications, or both; bowel incontinence; and frequency of fiber intake. CONCLUSIONS: These results suggest a number of factors that should be considered when treating neurogenic bowel complications and dysfunction in persons with SCI.

How Do Candidates Perform When Repeating the American Board of Physical Medicine and Rehabilitation Certification Examinations?

OBJECTIVE: The objective of this study was to examine the likelihood of passing the Part I and Part II American Board of Physical Medicine and Rehabilitation (ABPMR) certification examinations after initially failing. DESIGN: This was a retrospective review of candidates who had taken the ABPMR initial certification examinations between 2010 and 2014. RESULTS: Passing rates declined markedly with repeated attempts for both part I and part II. Passing rates (mean [95% confidence interval]) for part I were first attempt, 90% (87%-92%); second attempt, 58% (52%-66%); third attempt, 41% (26%-54%); fourth or greater attempt, 17% (3%-31%). For part II, the passing rates were first attempt, 87% (82%-92%); second attempt, 65% (56%-75%); third attempt, 41% (17%-65%); fourth or greater attempt, 20% (0%-59%). Those who were closer to the passing score on their initial attempt had a greater chance of passing on successive attempts. CONCLUSIONS: Passing rates for the ABPMR certification examination decline markedly with greater numbers of attempts. Those who fail again after one repeat attempt should rethink their examination preparation strategy before attempting the examination again.

Does Delay in Taking the American Board of Physical Medicine and Rehabilitation Certification Examinations Affect Passing Rates?

OBJECTIVES: The objective of this study was to examine whether a delay in initially taking the Part I or Part II American Board of Physical Medicine and Rehabilitation certification examinations influences the score or passing rates of candidates and whether enrollment in a subspecialty fellowship influences performance on the Part II certification examination. DESIGN: This was a retrospective review of first-time candidates taking the American Board of Physical Medicine and Rehabilitation initial certification examinations from 2010 to 2014. RESULTS: Passing rates declined as candidates delayed the examination past the time of initial eligibility. Passing rates for Part I were as follows (mean [95% confidence interval]): no delay, 91% (89%-94%); 1-yr delay, 68% (56%-82%); and more that 2 yrs' delay, 59% (55%-68%). For Part II, passing rates were as follows: no delay, 90% (85%-94%); 1-yr delay, 83% (72%-94%); and more than 2 yrs' delay, 68% (50%-83%). Those completing an accredited fellowship performed better (92% pass rate) on the Part II examination than did those who did not (81% pass rate), but they also had higher final year evaluations from their residency program directors. CONCLUSIONS: It seems preferable to take both Part I and Part II examinations as soon as one is eligible. Enrollment in an accredited fellowship may be associated with a higher chance of passing the examination.

Simplified Approach to Diagnosing Sleep-Disordered Breathing and Nocturnal Hypercapnia in Individuals With Spinal Cord Injury.

OBJECTIVE: To evaluate a strategy of home-based testing to diagnose sleep-disordered breathing and nocturnal hypercapnia in individuals with spinal cord injury (SCI). DESIGN: Case series. SETTING: Referral center. PARTICIPANTS: Adults with C1-T6 SCI (N=81). Individuals were eligible if ≥ 18 years old, with SCI of ≥ 3 months' duration, living within 100 miles of the study site, and not meeting exclusion criteria. Of the 161 individuals recruited from the SCI Model System database who were not enrolled, reasons were not interested in participating, change of location, prior positive pressure ventilation use, or medical contraindication. Ten individuals did not complete the study. INTERVENTIONS: Performance of an unsupervised home sleep apnea test combined with transcutaneous partial pressure of carbon dioxide/oxygen saturation by pulse oximetry monitoring. MAIN OUTCOME MEASURES: Prevalence of sleep-disordered breathing and nocturnal hypercapnia. Clinical and physiological variables were examined to determine which, if any, correlate with the severity of sleep-disordered breathing. RESULTS: Obstructive sleep apnea (OSA) was found in 81.3% of individuals, central sleep apnea (CSA) was found in 23.8%, and nonspecific hypopnea events, where respiratory effort was too uncertain to classify, were present in 35%. Nonspecific hypopnea events correlated strongly with CSA but weakly with OSA, suggesting that conventional sleep apnea test scoring may underestimate central/neuromuscular hypopneas. Nocturnal hypercapnia was present in 28% and oxygen desaturation in 18.3%. Neck circumference was the primary predictor for OSA, whereas baclofen use and obstructive apnea/hypopnea index weakly predicted CSA. Awake transcutaneous partial pressure of carbon dioxide and CSA were only marginally associated with nocturnal hypercapnia. CONCLUSIONS: Unsupervised home sleep apnea testing with transcutaneous capnography effectively identifies sleep-disordered breathing and nocturnal hypercapnia in individuals with SCI.

What would brain-computer interface users want: opinions and priorities of potential users with spinal cord injury.

OBJECTIVES: To identify perceptions among people with spinal cord injury (SCI) of the priorities for brain-computer interface (BCI) applications and design features along with the time investment and risk acceptable to obtain a BCI. DESIGN: Survey. SETTING: Research registry participants surveyed via telephone and BCI usage study participants surveyed in person before BCI use. PARTICIPANTS: Convenience sample of people with SCI (N=40), consisting of persons from the registry (n=30) and from the BCI study (n=10). Participants were classified as those with low function (n=24) and those with high function (n=16). INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Descriptive statistics of functional independence, living situations and support structures, ratings of importance of different task and design features, and acceptable levels of performance, risk, and time investment. RESULTS: BCIs were of interest to 96% of the low-function group. Emergency communication was the top priority task (ranked in the top 2 by 43%). The most important design features were "functions the BCI provides" and "simplicity of BCI setup." Desired performance was 90% accuracy, with standby mode errors no more than once every 4 hours and speeds of more than 20 letters per minute. Dry electrodes were preferred over gel or implanted electrodes (P<.05). Median acceptable setup time was 10 to 20 minutes, satisfying 65% of participants. CONCLUSIONS: People with low functional independence resulting from SCI have a strong interest in BCIs. Advances in speed and setup time will be required for BCIs to meet the desired performance. Creating BCI functions appropriate to the needs of those with SCI will be of ultimate importance for BCI acceptance with this population.

Efficacy of venlafaxine XR for the treatment of pain in patients with spinal cord injury and major depression: a randomized, controlled trial.

OBJECTIVES: To (1) determine the efficacy of venlafaxine XR for the treatment of pain (secondary aim) in individuals with spinal cord injury (SCI) enrolled in a randomized controlled trial (RCT) on the efficacy of venlafaxine XR for major depressive disorder (MDD) (primary aim); and (2) test the hypothesis that venlafaxine XR would be effective for both neuropathic and nociceptive pain. DESIGN: Multisite, double-blind, randomized (1:1) controlled trial with subjects block randomized and stratified by site, lifetime history of substance abuse, and prior history of MDD. SETTING: Six Departments of Physical Medicine and Rehabilitation in university-based medical schools. PARTICIPANTS: Individuals (N=123) with SCI and major depression between 18 and 64 years of age, at least 1 month post-SCI who also reported pain. INTERVENTION: Twelve-week trial of venlafaxine XR versus placebo using a flexible titration schedule. OUTCOME MEASURES: A 0-to-10 numeric rating scale for pain, pain interference items of the Brief Pain Inventory; 30% and 50% responders. RESULTS: The effect of venlafaxine XR on neuropathic pain was similar to that of placebo. However venlafaxine XR resulted in statistically significant and clinically meaningful reductions in nociceptive pain site intensity and interference even after controlling for anxiety, depression, and multiple pain sites within the same individual. For those who achieved a minimally effective dose of venlafaxine XR, some additional evidence of effectiveness was noted for those with mixed (both neuropathic and nociceptive) pain sites. CONCLUSIONS: Venlafaxine XR could complement current medications and procedures for treating pain after SCI and MDD that has nociceptive features. Its usefulness for treating central neuropathic pain is likely to be limited. Research is needed to replicate these findings and determine whether the antinociceptive effect of venlafaxine XR generalizes to persons with SCI pain without MDD.

Acquired myopathy/dystrophies.

Diseases of muscle may be congenital or acquired. They cause muscle weakness without sensory loss. The onset, distribution, and clinical course help to differentiate the type of muscle disorder. The diagnostic workup may include laboratory examination, electrodiagnostic studies, and muscle biopsy. A definitive diagnosis leads to better decision making with regard to treatment, genetic education, prognosis, functional expectations, and the impact of exercise on muscle function.

Home-based overnight transcutaneous capnography/pulse oximetry for diagnosing nocturnal hypoventilation associated with neuromuscular disorders.

OBJECTIVE: To determine the utility of home-based, unsupervised transcutaneous partial pressure of carbon dioxide (tc-Pco(2)) monitoring/oxygen saturation by pulse oximetry (Spo(2)) for detecting nocturnal hypoventilation (NH) in individuals with neuromuscular disorders. DESIGN: Retrospective case series analyzed consecutively. SETTING: Multidisciplinary neuromuscular respiratory failure (NMRF) clinic at an academic institution. PARTICIPANTS: Subjects (N=35, 68.6% men; mean age, 46.9y) with spinal cord injury (45.7%) or other neuromuscular disorders underwent overnight tests with tc-Pco(2)/Spo(2) monitoring. Fifteen (42.9%) were using nocturnal ventilatory support, either bilevel positive airway pressure (BiPAP) or tracheostomy ventilation (TV). INTERVENTIONS: A respiratory therapist brought a calibrated tc-Pco(2)/Spo(2) monitor to the patient's home and provided instructions for data collection during the subject's normal sleep period. Forced vital capacity (FVC), body mass index (BMI), and exhaled end-tidal Pco(2) (ET-Pco(2)) were recorded at a clinic visit before monitoring. MAIN OUTCOME MEASURES: Detection of NH (tc-Pco(2) ≥50mmHg for ≥5% of monitoring time). Data were also analyzed to determine whether nocturnal oxygen desaturation (Spo(2) ≤88% for ≥5% of monitoring time), FVC, BMI, or daytime ET-Pco(2) could predict the presence of NH. RESULTS: NH was detected in 18 subjects (51.4%), including 53.3% of those using BiPAP or TV. NH was detected in 43.8% of ventilator-independent subjects with normal daytime ET-Pco(2) (present for 49.4%±31.5% [mean ± SD] of the study period), and in 75% of subjects with an elevated daytime ET-Pco(2) (present for 92.3%±8.7% of the study period). Oxygen desaturation, BMI, and FVC were poor predictors of NH. Only 3 attempted monitoring studies failed to produce acceptable results. CONCLUSIONS: Home-based, unsupervised monitoring with tc-Pco(2)/Spo(2) is a useful method for diagnosing NH in NMRF.