Quality of life after spinal cord injury: The impact of pain

Effects of Combined Intrathecal Mesenchymal Stem Cells and Schwann Cells Transplantation on Neuropathic Pain in Complete Spinal Cord Injury: A Phase II Randomized Active-Controlled Trial

Neuropathic pain is a debilitating complication following spinal cord injury (SCI). Currently, effective treatments for SCI-induced neuropathic pain are highly lacking. This clinical trial aimed to investigate the efficacy of combined intrathecal injection of Schwann cells (SCs) and bone marrow-derived mesenchymal stem cells (BMSCs) in improving SCI-induced neuropathic pain. This study was a parallel-group, randomized, open-label, active-controlled phase II trial with two arms, including treatment and control groups. Patients with complete SCI-induced neuropathic pain in the treatment group received a single combined intrathecal injection of BMSCs and SCs. Study outcome measures were International SCI Pain Basic Data Set (ISCIPBDS) and World Health Organization (WHO) Quality of Life Assessment Instrument (WHOQOL-BREF). A total of 37 (55.2%) and 30 (44.8%) patients in the treatment and control groups were followed up for 6 months, respectively. Significant reductions in mean scores of interference items in the treatment group, including daily activities (P < 0.001), mood (P < 0.001), and sleep (P < 0.001), were found at 6 months after the injection compared with the control one. Similarly, pain frequency (P = 0.002), mean (P = 0.001), and worst (P = 0.001) numeric rating scale (NRS) pain intensity scores showed significant reductions in the treatment group after 6 months compared with the control one. Based on multiple regression analysis controlled for potential confounders, significant associations between changes in all outcome measures over the study period and the treatment group were found. This clinical trial indicated the efficacy of combined cell therapy in improving the neuropathic pain and quality of life in complete SCI patients. Future investigations should evaluate the effects of combination of this strategy with other existing therapies for SCI-induced neuropathic pain. This clinical trial was also registered prospectively at the Iranian Registry of Clinical Trials (IRCT20200502047277N8).

Exoskeleton Training for Spinal Cord Injury Neuropathic Pain (ExSCIP): Protocol for a Phase 2 Feasibility Randomised Trial

Background

Following Spinal Cord Injury (SCI), 53% of people develop neuropathic pain (NP). NP can be more debilitating than other consequences of SCI, and a persistent health issue. Pharmacotherapies are commonly recommended for NP management in SCI, although severe pain often remains refractory to these treatments in many sufferers. Furthermore, poor medication adherence exists, stemming from unacceptable side-effects and fear of dependency.Sensorimotor stimulation using active walking with robotic assistance has not been well studied in NP after SCI, despite convincing locomotor-based pre-clinical studies, identifying prevention and reversal of NP.Our primary aim is to assess the impact of exoskeleton-based walking on NP intensity and interference after SCI and examine feasibility outcomes for progression to a definitive trial.

Methods

This is a phase 2 single-blinded, randomised feasibility study. It will test the feasibility and acceptability of exoskeleton-based walking 3 times per week for 12 weeks (intervention), as a mechanistic-based intervention for NP after SCI. The comparator will be an equally dosed, blended relaxation programme devoid of motor imagery prompts. 40 participants with moderate-to-severe NP post SCI will be recruited and randomised to intervention and comparator groups.The primary outcomes are feasibility outcomes for progression to definitive trial which include recruitment and retention rates, adverse events and acceptability of the intervention.Secondary outcomes explore changes in NP intensity and interference as measured by the International Spinal Cord Injury Pain Basic Data Set 3.0 (ISCIPBDS) at baseline, post-intervention (week 13) and at 6-month follow-up.

Conclusions

There is a need to explore non-pharmacological management of NP after SCI. The findings of this feasibility trial will inform the development of a future multicentre, international RCT.

Trial Registration

NCT06463418, 08/07/2024, https://clinicaltrials.gov/study/NCT06463418.

The effect of neuropathic pain treatments on pain interference following spinal cord injury: A systematic review

CONTEXT

Neuropathic pain is a common and debilitating condition following SCI. While treatments for neuropathic pain intensity have been reviewed, the impact on pain interference has not been summarized.

OBJECTIVE

To systematically review the effect of neuropathic pain interventions on pain interference in individuals with spinal cord injury.

METHODS

This systematic review included randomized controlled trials and quasi-experimental (non-randomized) studies which assessed the impact of an intervention on pain interference in individuals with spinal cord injury and neuropathic pain. Articles were identified by searching MEDLINE (1996 to April 11, 2022), EMBASE (1996 to April 11, 2022), PsycInfo (1987 to April, week 2, 2022). Studies were assessed for methodologic quality using a modified GRADE approach and were given quality of evidence (QOE) scores on a 4-point scale ranging from very low to high.

RESULTS

Twenty studies met the inclusion criteria. These studies fell into the following categories: anticonvulsants (n = 2), antidepressants (n = 1), analgesics (n = 1), antispasmodics (n = 1), acupuncture (n = 2), transcranial direct current stimulation (n = 1), active cranial electrotherapy stimulation (n = 2), transcutaneous electrical nerve stimulation (n = 2), repetitive transcranial magnetic stimulation (n = 1), functional electrical stimulation (n = 1), meditation and imagery (n = 1), self-hypnosis and biofeedback (n = 1), and interdisciplinary pain programs (n = 4).

CONCLUSION

When considering studies of moderate to high quality, pregabalin, gabapentin, intrathecal baclofen, transcranial direct current stimulation, and transcutaneous electrical nerve stimulation (in 1 of 2 studies) were shown to have beneficial effects on pain interference. However, due to the low number of high-quality studies further research is required to confirm the efficacy of these interventions prior to recommending their use to reduce pain interference.

Pain, pain interference, social and school/work functioning in youth with spinal cord injury: A mediation analysis

CONTEXT/OBJECTIVE

The objective of the present study was to investigate the effects of pain severity, pain interference and social functioning in a serial multiple mediator model predicting school/work functioning in youth with spinal cord injury (SCI) from their perspective.

DESIGN

Explanatory or mechanistic study.

SETTING

Pediatric specialty hospital.

PARTICIPANTS

125 youth with SCI ages 8-24.

OUTCOME MEASURES

The Pain Severity Item and Pain Interference Scale from the PedsQL™ Spinal Cord Injury Module, and the Social Functioning and School/Work Functioning Scales from the PedsQL™ 4.0 Generic Core Scales Short Form SF15 were completed.

RESULTS

Hierarchical multiple regression and serial multiple mediator model analyses were conducted to test the percent variability accounted for and the mediating effects of pain interference and social functioning in the association between pain severity and school/work functioning. Pain predictive effects on school/work functioning were serially mediated by pain interference and social functioning. In a predictive analytics model conducted with hierarchical multiple regression analysis, age, sex, pain, pain interference and social functioning accounted for 45% of the variance in youth-reported school/work functioning (P < 0.001), demonstrating a large effect size.

CONCLUSION

The mechanisms of the predictive effects of pain severity on school/work functioning in youth with SCI are explained in part by the serial multiple mediator effects of pain interference and social functioning. Identifying the multiple mediators of SCI pain on school/work functioning from the perspective of youth with SCI may facilitate future clinical research and practice to ameliorate impaired daily functioning and improve overall well-being.

Choosing non-pharmacological treatments for neuropathic pain in spinal cord injury: a qualitative study

PURPOSE

The aims of this study were to explore (1) the considerations of people with spinal cord injury (SCI) in choosing to use non-pharmacological treatments (N-PTs) for neuropathic pain (NP), (2) which factors influence their decision and who is involved in this choice.

MATERIALS AND METHODS

Eleven individuals with SCI and NP were interviewed. Interviews were transcribed verbatim, transcripts were analysed through thematic coding, following an inductive content analysis approach.

RESULTS

A journey towards finding and choosing N-PTs emerged. Key phases in this journey were: motives, strategy and practical considerations. Pain and its impact on their life led participants to consider N-PTs. Motives were participants' negative attitudes towards regular medication, willingness to try everything and disappointment and frustration with the guidance from their health care provider (HCP). The search strategies often involved third parties and the internet. This led them to choose a specific N-PT. The journey was influenced by one's attitude, previous personal experience, experience of HCPs, financial considerations, availability and convenience of the treatment.

CONCLUSIONS

The journey individuals with SCI and NP go through to find N-PTs to manage pain is difficult and often lonely. Findings highlight the importance of HCPs accompanying people with SCI in finding N-PTs.

Pain interference, pain type, and quality of life among adults with spina bifida

INTRODUCTION

Individuals with spina bifida (SB) experience nociceptive and neuropathic pain, and women with SB report more pain. However, the relationship between pain type and gender on pain interference and quality of life (QoL) among individuals with SB is less understood.

OBJECTIVE

To assess relationships among pain interference, pain quality, participation-related QoL, and gender among adults with SB.

DESIGN

Fifty-one adults with SB completed a self-report survey assessing SB characteristics, pain severity, pain type, pain interference, and QoL.

SETTING

Hospital outpatient adult SB clinic.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Measures of nociceptive pain quality, neuropathic pain quality, participation-related QoL, as well as pain interference with general activities, mood, and sleep were selected a priori as study measures.

RESULTS

Fifty-eight percent (N = 30) reported pain and more women than men reported pain (69% vs. 38%, p = .003). Higher general pain interference was associated with lower QoL (r = 0.444, p = .042), but not mood or sleep pain interference (both p's ≥ .451). There was no statistically significant difference in pain interference between genders (p = .138). Nociceptive pain was more common. Levels of nociceptive pain were positively associated with general pain interference, sleep pain interference, and mood pain inference. Neither pain type was associated with QoL (both p's > .082).

CONCLUSIONS

The results from this study reveal key differences/similarities among four interrelated factors: pain, pain interference, QoL, and gender. Pertinent information gathered on pain type and QoL, like increased prevalence of nociceptive pain, can be utilized to formulate proactive and effective treatment plans for individuals with SB that may benefit their sleep pain interference and mood pain interference.

Reciprocal association between pain and quality of life after newly acquired spinal cord injury

PURPOSE

Pain is highly prevalent in spinal cord injury (SCI) and a key determinant of quality of life (QoL). This is the first study to examine reciprocal associations between pain and QoL in patients undergoing their first inpatient rehabilitation after SCI.

METHODS

Longitudinal data, with three measurement time points (1 month and 3 months after SCI onset, and at discharge from inpatient rehabilitation) from the Inception Cohort of the Swiss Spinal Cord Injury Cohort Study. Participants were 381 individuals aged ≥ 16 years with a newly diagnosed traumatic or non-traumatic SCI. 75.1% were male and the average age was 53.2 years. Random intercept cross-lagged panel models were conducted to examine the reciprocal association between pain intensity and QoL, as measured with the International SCI QoL Basic Data Set three individual items (satisfaction with life, physical health, and psychological health) and total score (mean of the three individual items).

RESULTS

Both item and total QoL scores increased over time. 1 month: 5.3 (SD = 2.7), 3 months: 5.9 (SD = 2.3), discharge: 6.6 (SD = 2.0). Participants reported relatively low levels of pain intensity that remained stable over the course of inpatient rehabilitation. 1 month: 2.7 (SD = 2.3), 3 months: 2.6 (SD = 2.4), discharge: 2.7 (SD = 2.5). There were no significant cross-lagged associations between QoL and pain intensity across time.

CONCLUSION

Results indicate that pain intensity does not predict changes in QoL during first rehabilitation, and vice versa. Associations between pain intensity and QoL reported by previous studies may be attributable to individual characteristics and timely events that simultaneously influence pain and QoL.

Improvement of quality of life after 2-month exoskeleton training in patients with chronic spinal cord injury

OBJECTIVE

To examine changes in quality of life (QoL) after an eight-week period of robotic exoskeleton training in a homogeneous group of patients with chronic complete spinal cord injury (SCI).

DESIGN

Prospective single-group pre-post study.

SETTING

Rehabilitation center.

PARTICIPANTS

Patients with a chronic (>6 months) motor complete SCI (T1-L1).

INTERVENTION

Twenty-four training sessions with the ReWalk exoskeleton over an eight-week period.

MAIN OUTCOME MEASURE

QoL, assessed with the sum score of the Short Form-36 with Walk Wheel modification (SF-36ww). Secondary outcome measures were the eight SF-36ww subdomains, satisfaction with bladder and bowel management, lower extremity joint passive range of motion (pROM), and lower extremity spasticity.

RESULTS

Twenty-one participants completed the training. QoL significantly improved after the training period (average SF-36 sum score 621 ± 90) compared to baseline (571 ± 133) (t(20)=-2.5, P=.02). Improvements were seen on the SF-36ww subdomains for pain (P=.003), social functioning (P=.03), mental health (P=.02), and general health perception (P=.01). Satisfaction with bladder management (range 1-5) improved from median 3 at baseline to 4 after exoskeleton training (P=0.01). No changes in satisfaction with bowel management (P=.11), pROM (hip-extension (P=.49), knee-extension (P=.36), ankle dorsiflexion (P=.69)), or spasticity (P=.94) were found.

CONCLUSION

Even in patients with chronic motor complete SCI and a relatively high level of QoL at baseline, a short-term exoskeleton training improved their QoL, pain and satisfaction with bladder management; findings that warrant further controlled studies in this specific SCI population.

Cognitive, behavioral and psychiatric symptoms in patients with spinal cord injury: a scoping review

Spinal Cord Injury (SCI) is a condition where the spinal cord is damaged and experiences partial or complete loss of motor and/or sensory function, which is typically less than normal. After SCI, patients may exhibit more severe psychiatric symptoms and experience cognitive impairments, including reduced speed and attention processing capacity, as well as difficulties with executive function and episodic memory retention. Among the behavioral and psychiatric symptoms, depression, anxiety, substance use disorder, and posttraumatic stress disorder are the most common. This review aims to investigate the cognitive, behavioral, or psychiatric symptoms of the patient with SCI and their influence on the rehabilitation process. Studies were identified from an online search of PubMed, Web of Science, Cochrane Library, and Embase databases. Studies published between 2013-2023 were selected. This review has been registered on OSF (n) 3KB2U. We have found that patients with SCI are at high risk of cognitive impairment and experience a wide range of difficulties, including tasks based on processing speed and executive function. This clinical population may experience adjustment disorders with depression and anxiety, as well as other psychiatric symptoms such as fatigue, stress, and suicidal ideation. This review has demonstrated that SCI patients may experience psychiatric symptoms and cognitive impairments that affect their functioning. At the same time, these patients may be more prone to various adjustment and mood disorders. Moreover, these two aspects may interact with each other, causing a range of symptoms, increasing the risk of hospitalization, and delaying the rehabilitation process.

Inhibition of aquaporin-4 and its subcellular localization attenuates below-level central neuropathic pain by regulating astrocyte activation in a rat spinal cord injury model

The mechanisms of central neuropathic pain (CNP) caused by spinal cord injury have not been sufficiently studied. We have found that the upregulation of astrocytic aquaporin-4 (AQP4) aggravated peripheral neuropathic pain after spinal nerve ligation in rats. Using a T13 spinal cord hemisection model, we showed that spinal AQP4 was markedly upregulated after SCI and mainly expressed in astrocytes in the spinal dorsal horn (SDH). Inhibition of AQP4 with TGN020 suppressed astrocyte activation, attenuated the development and maintenance of below-level CNP and promoted motor function recovery in vivo. In primary astrocyte cultures, TGN020 also changed cell morphology, diminished cell proliferation and suppressed astrocyte activation. Moreover, T13 spinal cord hemisection induced cell-surface abundance of the AQP4 channel and perivascular localization in the SDH. Targeted inhibition of AQP4 subcellular localization with trifluoperazine effectively diminished astrocyte activation in vitro and further ablated astrocyte activation, attenuated the development and maintenance of below-level CNP, and accelerated functional recovery in vivo. Together, these results provide mechanistic insights into the roles of AQP4 in the development and maintenance of below-level CNP. Intervening with AQP4, including targeting AQP4 subcellular localization, might emerge as a promising agent to prevent chronic CNP after SCI.

Exploring the Experience of Living with Pain after Spinal Cord Injury: A Qualitative Study

A spinal cord injury is a life-changing experience that results in functional limitations and an increased risk of secondary health conditions. People with spinal cord injury identify pain as the most devastating health problem following their injury that not only affects their social life but their mental well-being as well. This study is aimed at exploring the lived experience of living with pain by community-dwelling manual wheelchair users with spinal cord injuries. An explorative qualitative design was used to explore their experiences. In-depth interviews were recorded and transcribed, and the data were analysed using inductive thematic content analysis in the MAXQDA v2020. Fifteen manual wheelchair users with paraplegia participated in this study, and four themes were identified from their experience of living with pain: pain constantly lurks, pain is worse than the direct consequences of the SCI, pain is restrictive, and life continues despite the pain. Categories and subcategories included the participants being one with the pain; pain interfering with sleep; feelings of anger, isolation, and suicidal ideation; and uncertainties about what the future holds living with pain. Living with pain after SCI is a challenging feat, and effective management of pain is necessary to improve not only functioning and mobility but also mental health and life satisfaction.

Neurogenic Cell Behavior in 3D Culture Enhanced Within a Highly Compliant Synthetic Hydrogel Platform Formed via Competitive Crosslinking

Purpose

Scaffold materials that better support neurogenesis are still needed to improve cell therapy outcomes for neural tissue damage. We have used a modularly tunable, highly compliant, degradable hydrogel to explore the impacts of hydrogel compliance stiffness on neural differentiation. Here we implemented competitive matrix crosslinking mechanics to finely tune synthetic hydrogel moduli within soft tissue stiffnesses, a range much softer than typically achievable in synthetic crosslinked hydrogels, providing a modularly controlled and ultrasoft 3D culture model which supports and enhances neurogenic cell behavior.

Methods

Soluble competitive allyl monomers were mixed with proteolytically-degradable poly(ethylene glycol) diacrylate derivatives and crosslinked to form a matrix, and resultant hydrogel stiffness and diffusive properties were evaluated. Neural PC12 cells or primary rat fetal neural stem cells (NSCs) were encapsulated within the hydrogels, and cell morphology and phenotype were investigated to understand cell-matrix interactions and the effects of environmental stiffness on neural cell behavior within this model.

Results

Addition of allyl monomers caused a concentration-dependent decrease in hydrogel compressive modulus from 4.40 kPa to 0.26 kPa (natural neural tissue stiffness) without influencing soluble protein diffusion kinetics through the gel matrix. PC12 cells encapsulated in the softest hydrogels showed significantly enhanced neurite extension in comparison to PC12s in all other hydrogel stiffnesses tested. Encapsulated neural stem cells demonstrated significantly greater spreading and elongation in 0.26 kPa alloc hydrogels than in 4.4 kPa hydrogels. When soluble growth factor deprivation (for promotion of neural differentiation) was evaluated within the neural stiffness gels (0.26 kPa), NSCs showed increased neuronal marker expression, indicating early enhancement of neurogenic differentiation.

Conclusions

Implementing allyl-acrylate crosslinking competition reduced synthetic hydrogel stiffness to provide a supportive environment for 3D neural tissue culture, resulting in enhanced neurogenic behavior of encapsulated cells. These results indicate the potential suitability of this ultrasoft hydrogel system as a model platform for further investigating environmental factors on neural cell behavior.

Supplementary Information

The online version contains supplementary material available at 10.1007/s12195-024-00794-2.

Pain and quality of life in persons with spinal cord injury: Mediating effects of mindfulness, self-efficacy, social support, and functional independence

OBJECTIVE

To identify mediating roles of mindfulness, self-efficacy, social support, and functional independence in the relationship between pain and quality of life (QOL) in persons with spinal cord injury (SCI).

METHODS

A cross-sectional descriptive study was conducted using a sample of 272 persons with SCI living in the United States. The participants completed self-report standardized questionnaires on a Qualtrics survey. A parallel mediation analysis adjusting for covariates was performed to test the hypotheses.

RESULTS

Findings showed significant direct effects of pain on functional independence, self-efficacy, mindfulness, and social support. Self-efficacy, mindfulness, and social support had significant direct effects on QOL. In the mediation analysis, mindfulness, self-efficacy, and social support significantly mediated the relationship between pain and QOL, controlling for other variables in the model.

CONCLUSIONS

This study adds to the extant literature by providing evidence that mindfulness, self-efficacy, and social support not only directly contribute to QOL but are likely to mitigate the negative effect of pain on QOL in persons with SCI. Identifying these potential factors that can assuage the adverse effects of pain on QOL is a first step toward active intervention to facilitate the adjustment of persons with SCI.

Pain and quality of life in athletes vs non-athletes with spinal cord injury: Observational study

Spinal Cord Injuries (SCI) may cause non-motor symptoms, such as chronic pain, which impair quality of life (QoL)Objective: To investigate the relationship between adapted competitive sports, pain, and QoL in people with SCI in a limited resources setting population.Methods: This prospective cross-sectional observational study involved 16 athletes and 24 non-athletes with SCI and collected data on demographic and clinical variables including scores for pain and pain interference in daily life (Brief Pain Inventory, BPI), neuropathic pain severity (Neuropathic Pain Symptoms Inventory, NPSI) and Quality of life (Word Health Organization Quality of Life Assessment, WHOQOL-BREF). Non-parametric testing was used to compare the groups, and due to athletes being younger, multiple linear regression analyses were used to adjust for the effect of sports practice on the outcome variables when adjusting for age.Results: Athletes were younger (median age 36y) than non-athletes (median age 41.5y; Mann-Whitney U test P = 0.011), and QoL was superior in athletes for the Physical, Psychological, Social Relationships, Self-Evaluation domains, and Total Score when adjusted for age (P < 0.01). Despite having no significant differences in pain intensity scores (NPSI, P = 0.742 and BPI, P = 0.261) athletes had less pain interference on "Relationship with Others", "Enjoyment of Life", and Total score (P < 0.05). Participation in competitive adapted sports (P = 0.004) and Total Pain Interference (P = 0.043) were significantly associated with QoL scores in the multiple linear regression analyses.Conclusion: Athletes with SCI have better QoL and less pain interference in some aspects of life when compared to non-athletes.

Photobiomodulation reduces neuropathic pain after spinal cord injury by downregulating CXCL10 expression

BACKGROUND

Many studies have recently highlighted the role of photobiomodulation (PBM) in neuropathic pain (NP) relief after spinal cord injury (SCI), suggesting that it may be an effective way to relieve NP after SCI. However, the underlying mechanisms remain unclear. This study aimed to determine the potential mechanisms of PBM in NP relief after SCI.

METHODS

We performed systematic observations and investigated the mechanism of PBM intervention in NP in rats after SCI. Using transcriptome sequencing, we screened CXCL10 as a possible target molecule for PBM intervention and validated the results in rat tissues using reverse transcription-polymerase chain reaction and western blotting. Using immunofluorescence co-labeling, astrocytes and microglia were identified as the cells responsible for CXCL10 expression. The involvement of the NF-κB pathway in CXCL10 expression was verified using inhibitor pyrrolidine dithiocarbamate (PDTC) and agonist phorbol-12-myristate-13-acetate (PMA), which were further validated by an in vivo injection experiment.

RESULTS

Here, we demonstrated that PBM therapy led to an improvement in NP relative behaviors post-SCI, inhibited the activation of microglia and astrocytes, and decreased the expression level of CXCL10 in glial cells, which was accompanied by mediation of the NF-κB signaling pathway. Photobiomodulation inhibit the activation of the NF-κB pathway and reduce downstream CXCL10 expression. The NF-κB pathway inhibitor PDTC had the same effect as PBM on improving pain in animals with SCI, and the NF-κB pathway promoter PMA could reverse the beneficial effect of PBM.

CONCLUSIONS

Our results provide new insights into the mechanisms by which PBM alleviates NP after SCI. We demonstrated that PBM significantly inhibited the activation of microglia and astrocytes and decreased the expression level of CXCL10. These effects appear to be related to the NF-κB signaling pathway. Taken together, our study provides evidence that PBM could be a potentially effective therapy for NP after SCI, CXCL10 and NF-kB signaling pathways might be critical factors in pain relief mediated by PBM after SCI.

Risk Factors for Suicidality in Individuals With Spinal Cord Injury: A Focus on Physical and Functional Characteristics

OBJECTIVE

: To demonstrate the association between the physical and functional characteristics of individuals with spinal cord injury (SCI) and suicidality, an area of research that is less understood than the association with demographic, social, and psychological characteristics.

METHODS

: A retrospective cross-sectional study was conducted with 259 patients with SCI admitted for rehabilitation at the National Rehabilitation Center, Seoul, between January 2019 and December 2021. Demographic, SCI-related, physical, and functional data were collected from their medical records. Suicide risk was assessed using the Mini International Neuropsychiatric Interview.

RESULTS

: The 259 participants had an average age of 49.1 years, and 75.7% were male. The analysis revealed a statistically significant negative correlation between age and suicidality. No significant differences were found for sex, education, occupation, or SCI-related factors. Lower upper extremity motor score (UEMS) was significantly associated with higher suicide risk. Regarding functional factors, the inability to perform independent rolling, come to sit, wheelchair propelling, and self-driving were associated with increased suicidality. In the multiple linear regression analysis, lower UEMS, limited shoulder joint motion, upper extremity spasticity, and dependent wheelchair propulsion were predictors of higher suicide risk.

CONCLUSION

: This study highlights the associations among physical status, functional dependency, and suicide risk in individuals with SCI. These findings emphasize the need to address psychological aspects and physical and functional factors in the management of individuals with SCI who are at a high risk of suicide.

Exosomes from microRNA 146a overexpressed bone marrow mesenchymal stem cells protect against spinal cord injury in rats

BACKGROUND

This study aimed to investigate the effect of microRNA 146a (miR-146a) overexpressed bone marrow mesenchymal stem cells (BMMSCs) exosomes on spinal cord injury (SCI) recovery.

METHODS

Rat BMMSCs were isolated and transfected with miR-146a mimic (miR-mimic) and control mimic (NC-mimic), after which their exosomes were isolated. Afterward, SCI rat models were constructed, then treated with phosphate buffer saline (PBS), NC BMMSCs exosomes (separated from the culture medium of BMMSCs with NC-mimic), and miR-146a overexpressed BMMSCs exosomes (isolated from the culture medium of BMMSCs with miR-mimic), respectively; additionally, rats underwent sham surgery were treated with PBS as controls.

RESULTS

MiR-146a was upregulated in BMMSCs, and BMMSCs derived exosomes post miR-mimic transfection. Then in SCI rats, BMMSCs exosomes elevated the Basso, Beattie, and Bresnahan (BBB) score and reduced hematoxylin&eosin-reflected spinal cord tissue injury. In addition, BMMSCs exosomes did not affect TUNEL positive cells rate while increased NeuN(+) cells/field in spinal cord tissue from SCI rats. As for inflammation, BMMSCs exosomes repressed pro-inflammatory cytokine expressions, including interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α, in spinal cord tissue from SCI rats. Furthermore, miR-146a overexpressed BMMSCs exosomes presented with notably better effects regarding elevating BBB score in SCI rats and reducing tissue injury, neuron apoptosis, and inflammation while enhancing neuron viability in spinal cord tissue from SCI rats.

CONCLUSIONS

MiR-146a overexpressed BMMSCs exosomes enhance locomotor capacity and neuron viability while reducing neuron apoptosis and spinal cord tissue inflammation in SCI rats.

Non-Coding RNAs Regulate Spinal Cord Injury-Related Neuropathic Pain via Neuroinflammation

Secondary chronic neuropathic pain (NP) in addition to sensory, motor, or autonomic dysfunction can significantly reduce quality of life after spinal cord injury (SCI). The mechanisms of SCI-related NP have been studied in clinical trials and with the use of experimental models. However, in developing new treatment strategies for SCI patients, NP poses new challenges. The inflammatory response following SCI promotes the development of NP. Previous studies suggest that reducing neuroinflammation following SCI can improve NP-related behaviors. Intensive studies of the roles of non-coding RNAs in SCI have discovered that ncRNAs bind target mRNA, act between activated glia, neuronal cells, or other immunocytes, regulate gene expression, inhibit inflammation, and influence the prognosis of NP.

Predictors of quality of life of individuals living in Brazil with spinal cord injury/disease

STUDY DESIGN

A cross-sectional, descriptive study.

OBJECTIVES

To investigate the demographic, clinical behavioral, and rehabilitation predictors of the quality of life (QoL) of people with spinal cord injury/disease (SCI/D) in a middle-income country.

METHOD

Ninety-five participants living in the community were evaluated with the following instruments: World Health Organization Quality of Life - Bref; International SCI Core DataSet; Clinical Interview; Spinal Cord Secondary Conditions Scale and Patient Health Questionnaire; Numerical Pain Intensity Scale; Short-Form 12 Health Survey - Item 8 (how much pain hinders activities); Patient Health Questionnaire 2, Numerical Fatigue Scale. Data were analyzed via Spearman correlation, univariate analysis, and multiple regression to explain the effects associated with quality-of-life predictors.

RESULTS

The main factors that decreased quality of life were fatigue (by 11.5%), depression (by 5.5-12.8%), pain (by 1.3 in total life quality, in the physical domain by 8.6-9.6%), sores (15.6% in the physical domain only). The practice of sports increased the total quality of life by 14.4%, in the physical domain by 11.9%, in the psychological domain by 17.2%, and in the social domain by 23.7%.

CONCLUSIONS

Fatigue, risk of depression, pain, and the presence of sores are predictors of poor quality of life, and sports are a predictor of a better quality of life, for people with spinal cord injury. Multidisciplinary rehabilitation, in addition to policies, to increase accessibility and social inclusion, and incentives or subsidies for the practice of sports could improve QoL following SCI/D.

Pain and pain management experiences following spinal cord injury - a mixed methods study of Australian community-dwelling adults

PURPOSE

There is a high prevalence of persistent pain following SCI yet insights into its impact and the quality of pain care are limited. We aimed to explore, in-depth, the problem of persistent pain in Australian community-dwelling adults with a spinal cord injury (SCI). Our objectives were to investigate (i) how individuals experience persistent pain, (ii) how they experience pain care and (iii) the concordance between clinical practice guidelines for managing pain and reported care practices.

METHODS

We conducted a mixed-methods convergent parallel study. Adults with SCI and persistent pain completed a survey (n = 43); a subset of participants completed interviews (n = 10). We analysed the data from each method separately and then integrated the findings.

RESULTS

Results indicated that the life impact of persistent pain is variable but it can be more disabling than physical impairments and compound a sense of isolation and despair. Community-based management was reported to predominantly have a pharmacological focus, with occurrences of opioid misuse apparent in the data. Access to expert, comprehensive and individualised care was frequently reported as inadequate.

CONCLUSION

While some people with SCI and persistent pain can effectively self-manage their pain, for others the impact on quality of life is profound and complex care needs are commonly unmet.IMPLICATIONS FOR REHABILITATIONPersistent pain is a common consequence of SCI and profoundly impacts quality of life.Complex pain care needs are commonly unmet.Individuals require regular, comprehensive, biopsychosocial assessment.The effectiveness of pain management strategies must be monitored on an ongoing basis.Opportunities for personal self-management support must be available long-term.

Combined non-psychoactive Cannabis components cannabidiol and β-caryophyllene reduce chronic pain via CB1 interaction in a rat spinal cord injury model

The most frequently reported use of medical marijuana is for pain relief. However, its psychoactive component Δ9-tetrahydrocannabinol (THC) causes significant side effects. Cannabidiol (CBD) and β-caryophyllene (BCP), two other cannabis constituents, possess more benign side effect profiles and are also reported to reduce neuropathic and inflammatory pain. We evaluated the analgesic potential of CBD and BCP individually and in combination in a rat spinal cord injury (SCI) clip compression chronic pain model. Individually, both phytocannabinoids produced dose-dependent reduction in tactile and cold hypersensitivity in male and female rats with SCI. When co-administered at fixed ratios based on individual A50s, CBD and BCP produced enhanced dose-dependent reduction in allodynic responses with synergistic effects observed for cold hypersensitivity in both sexes and additive effects for tactile hypersensitivity in males. Antinociceptive effects of both individual and combined treatment were generally less robust in females than males. CBD:BCP co-administration also partially reduced morphine-seeking behavior in a conditioned place preference (CPP) test. Minimal cannabinoidergic side effects were observed with high doses of the combination. The antinociceptive effects of the CBD:BCP co-administration were not altered by either CB2 or μ-opioid receptor antagonist pretreatment but, were nearly completely blocked by CB1 antagonist AM251. Since neither CBD or BCP are thought to mediate antinociception via CB1 activity, these findings suggest a novel CB1 interactive mechanism between these two phytocannabinoids in the SCI pain state. Together, these findings suggest that CBD:BCP co-administration may provide a safe and effective treatment option for the management of chronic SCI pain.

The role of mindfulness in quality of life of persons with spinal cord injury: a cross-sectional study

BACKGROUND

Quality of life is considered the most overarching psychosocial adaptation outcome following the rehabilitation of persons with spinal cord injury. Literature suggests that the quality of life of persons with spinal cord injury is determined by many personal and psychological factors, including mindfulness. This study aimed to identify the direct and indirect effect of mindfulness on the quality of life of persons living with spinal cord injury.

METHODS

Participants consisted of 231 members of three spinal cord injury organizations in the United States: United Spinal Association, North American Spinal Cord Injury Consortium, and Paralyzed Veterans of America-Wisconsin Chapter. The participants completed a set of standardized self-report questionnaires in an online Qualtrics survey. A hierarchical regression analysis was performed to identify the contribution of mindfulness to quality of life, controlling for sociodemographic and injury-related factors. A serial mediation analysis was performed to examine the indirect effect of mindfulness on quality of life.

RESULTS

In the hierarchical regression analysis, sociodemographic and injury-related factors (i.e., age, gender, race, marital status, education, employment, level and completeness of injury, comorbidities, frequency of hospitalization, pain intensity, and functional limitation) and mindfulness explained 59% variance on quality of life of the participants with spinal cord injury. Mindfulness uniquely contributed to the higher quality of life above and beyond sociodemographic and injury-related variables. In the serial mediation analysis, pain and functional limitation did not significantly mediate the relationship between mindfulness and quality of life. However, the indirect effects of mindfulness on functional limitation and quality of life through pain were significant.

CONCLUSION

The findings underscore the vital role of mindfulness in improving the quality of life of persons with spinal cord injury. Implications of these findings for future research and clinical practice are discussed.

Association of sensory phenotype with quality of life, functionality, and emotional well-being in patients suffering from neuropathic pain

ABSTRACT

Neuropathic pain highly affects quality of life, well-being, and function. It has recently been shown based on cluster analysis studies that most patients with neuropathic pain may be categorized into 1 of 3 sensory phenotypes: sensory loss, mechanical hyperalgesia, and thermal hyperalgesia. If these phenotypes reflect underlying pathophysiological mechanisms, they may be more relevant for patient management than underlying neurological diagnosis or pain intensity. The aim of this study was thus to examine the impact of these sensory phenotypes on mental health, functionality, and quality of life. Data of 433 patients from the IMI/EuroPain network database were analyzed, and results of HADS-D/A, Pain Catastrophizing Scale, Euro Quality of Life 5D/-VAS, Brief Pain Inventory, and Graded Chronic Pain Scale between the sensory phenotypes were compared using multiple regression analysis. There was no difference in chronic pain grade, pain intensity, depression, or anxiety scores between phenotypes. Pain interference (Brief Pain Inventory) was higher (P = 0.002); self-reported health state lower (Euro Quality of Life 5D VAS, P = 0.02); and problems regarding mobility (P = 0.008), usual activities (P = 0.004), and self-care (P = 0.039) more prominent (EQ5-D) in the sensory loss compared with the thermal hyperalgesia phenotype. Patients with sensory loss also showed higher pain catastrophizing scores (P = 0.006 and 0.022, respectively) compared with the 2 other groups. Sensory phenotype is associated with the impact of neuropathic pain conditions on well-being, daily functionality, and quality of life but is less associated with pain intensity. These results suggest that the somatosensory phenotype should be considered for personalized pain management.

Physiological parameters and the use of compression stockings in individuals with spinal cord injuries: a scoping review

STUDY DESIGN

Scoping review.

OBJECTIVE

To summarize information on the physiological effects of compression stockings (CS) in individuals with spinal cord injuries (SCI) and suggest areas for future research.

METHODS

We asked, "What are the physiological effects of CS use in individuals with SCI?" Original studies of patients with SCI regardless of sex and age that focused on SCI and CS were included. Five biomedical databases were searched. Studies were selected by three researchers in two stages, starting with an abstract and title screening and continuing with a full text review for application of the inclusion and exclusion criteria. A narrative synthesis was then performed.

RESULTS

An initial search yielded 283 titles, of which five met the inclusion criteria and were subjected to the full text review. Among them, there were 78 individuals with SCI. The studies found that the use of CS at rest reduced deep vein thrombosis (DVT) and vascular capacitance but increased systolic blood pressure and norepinephrine level., three studies tested the use of CS During exercise; one found that time of the last lap in a standard court test was negatively affected; however, the greatest benefits were observed after exercises, such as reduced blood lactate level, improved autonomic function, and increased blood flow to the upper limbs.

CONCLUSION

We conclude that future research should examine the physiological effects and relationship of CS with: (a) pharmacological interventions, (b) body position changes, (c) physical fitness level, (d) wheelchair use duration, (e) exercise-induced thermal stress, (f) thermal stress mitigation, and (g) edema reduction.

Translation, cross-cultural adaptation, and analysis of the measurement properties of the Brazilian Portuguese version of the spinal cord injury pain instrument

STUDY DESIGN

A questionnaire validity study.

OBJECTIVES

To perform the translation, cross-cultural adaptation, and analysis of the measurement properties of the Brazilian Portuguese version of the Spinal Cord Injury Pain Instrument (SCIPI) for the screening of neuropathic pain in spinal cord injury.

SETTING

Neurorehabilitation hospital in north-eastern Brazil.

METHODS

We performed the translation and cross-cultural adaptation of the SCIPI. The pre-final version was applied in 10 patients with spinal cord injury sequelae and pain report. The final version of the SCIPI was applied to 100 patients. The measurement properties evaluated were structural validity, test-retest reliability, internal consistency, construct validity, and diagnostic accuracy.

RESULTS

None of the items in the pre-final version of the SCIPI had any comprehension problems. The one-dimensional structure of the final version of the SCIPI was adequate. There were significant correlations between the SCIPI and the Douleur Neuropathique 4 (rho = 0.546), as well as adequate test-retest reliability (intraclass correlation coefficient = 0.89, kappa ≥ 0.79), internal consistency (Cronbach's alpha ≥ 0.76), and diagnostic accuracy (area under the curve = 0.860).

CONCLUSION

The Brazilian version of the SCIPI presents measurement properties that are suitable for measuring neuropathic pain related to spinal cord injury.

Clinical and Patient-Related Outcome After Stabilization of Dorsal Pelvic Ring Fractures: A Retrospective Study Comparing Transiliac Fixator (TIFI) and Spinopelvic Fixation (SPF)

Purpose: Aim of this retrospective cohort study was the comparison of the transiliac fixator (TIFI) and spinopelvic fixation (SPF) for fixation of dorsal pelvic ring fractures in terms of clinical outcome, complications, and quality of life. Methods: Thirty-eight patients (23 men, 15 women; mean age 47 ± 19 years) with dorsal pelvic ring fractures (type-C-injuries after AO/OTA) that have been stabilized by either TIFI (group TIFI, n = 22) or SPF (group SPF, n = 16) between May 2015 and December 2018 were retrospectively reviewed. Outcome measurements included demographic data, perioperative parameters, and complications and were obtained from the medical information system. Quality of life was assessed using the German version of the short form 36 (SF-36) and short muskuloskeletal function assessment (SMFA-D). Clinical results were assessed using Merle d'Aubigné-Score, Iowa Pelvic Score, and Majeed Pelvic Score. Results: Both groups show relatively good post-operative results, which has previously been reported. Quality of life was comparable in both groups. Group TIFI was slightly superior regarding complication rates, cutting/suture time, and fluoroscopy time. Group SPF seemed to be superior regarding pain and pelvic scores. Conclusion: None of the methods could demonstrate significant superiority over the other. Management of pelvic injuries remains a highly individual challenge adapted to the individual patients' condition. Nevertheless, if fractures allow for stabilization with TIFI, the use of this method should be taken into consideration as a less invasive and more tissue-conserving approach.

Influence of severity and level of injury on the occurrence of complications during the subacute and chronic stage of traumatic spinal cord injury: a systematic review

OBJECTIVE

Secondary health conditions (SHCs) are long-term complications that frequently occur due to traumatic spinal cord injury (tSCI) and can negatively affect quality of life in this patient population. This study provides an overview of the associations between the severity and level of injury and the occurrence of SHCs in tSCI.

METHODS

A systematic search was conducted in PubMed and Embase that retrieved 44 studies on the influence of severity and/or level of injury on the occurrence of SHCs in the subacute and chronic phase of tSCI (from 3 months after trauma). The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed.

RESULTS

In the majority of studies, patients with motor-complete tSCI (American Spinal Injury Association [ASIA] Impairment Scale [AIS] grade A or B) had a significantly increased occurrence of SHCs in comparison to patients with motor-incomplete tSCI (AIS grade C or D), such as respiratory and urogenital complications, musculoskeletal disorders, pressure ulcers, and autonomic dysreflexia. In contrast, an increased prevalence of pain was seen in patients with motor-incomplete injuries. In addition, higher rates of pulmonary infections, spasticity, and autonomic dysreflexia were observed in patients with tetraplegia. Patients with paraplegia more commonly suffered from hypertension, venous thromboembolism, and pain.

CONCLUSIONS

This review suggests that patients with a motor-complete tSCI have an increased risk of developing SHCs during the subacute and chronic stage of tSCI in comparison with patients with motor-incomplete tSCI. Future studies should examine whether systematic monitoring during rehabilitation and the subacute and chronic phase in patients with motor-complete tSCI could lead to early detection and potential prevention of SHCs in this population.

Construction of a Conceptual Framework for Assessment of Health-Related Quality of Life in Dogs With Osteoarthritis

An owner's ability to detect changes in the behavior of a dog afflicted with osteoarthritis (OA) may be a barrier to presentation, clinical diagnosis and initiation of treatment. Management of OA also relies upon an owner's ability to accurately monitor improvement following a trial period of pain relief. The changes in behavior that are associated with the onset and relief of pain from OA can be assessed to determine the dog's health-related quality of life (HRQOL). HRQOL assessments are widely used in human medicine and if developed correctly can be used in the monitoring of disease and in clinical trials. This study followed established guidelines to construct a conceptual framework of indicators of HRQOL in dogs with OA. This generated items that can be used to develop a HRQOL assessment tool specific to dogs with OA. A systematic review was conducted using Web of Science, PubMed and Scopus with search terms related to indicators of HRQOL in dogs with osteoarthritis. Eligibility and quality assessment criteria were applied. Data were extracted from eligible studies using a comprehensive data charting table. Resulting domains and items were assessed at a half-day workshop attended by experts in canine osteoarthritis and quality of life. Domains and their interactions were finalized and a visual representation of the conceptual framework was produced. A total of 1,264 unique articles were generated in the database searches and assessed for inclusion. Of these, 21 progressed to data extraction. After combining synonyms, 47 unique items were categorized across six domains. Review of the six domains by the expert panel resulted in their reduction to four: physical appearance, capability, behavior, and mood. All four categories were deemed to be influenced by pain from osteoarthritis. Capability, mood, and behavior were all hypothesized to impact on each other while physical appearance was impacted by, but did not impact upon, the other domains. The framework has potential application to inform the development of valid and reliable instruments to operationalize measurement of HRQOL in canine OA for use in general veterinary practice to guide OA management decisions and in clinical studies to evaluate treatment outcomes.

Spinal cord injury in mice impacts central and peripheral pathology in a severity-dependent manner

ABSTRACT

Chronic pain is a common medical complication experienced by those living with spinal cord injury (SCI) and leads to worsened quality of life. The pathophysiology of SCI pain is poorly understood, hampering the development of safe and efficacious therapeutics. We therefore sought to develop a clinically relevant model of SCI with a strong pain phenotype and characterize the central and peripheral pathology after injury. A contusion (50 kdyn) injury, with and without sustained compression (60 seconds) of the spinal cord, was carried out on female C57BL/6J mice. Mice with compression of the spinal cord exhibited significantly greater heat and mechanical hypersensitivity starting at 7 days post-injury, concomitant with reduced locomotor function, compared to those without compression. Immunohistochemical analysis of spinal cord tissue revealed significantly less myelin sparing and increased macrophage activation in mice with compression compared to those without. As measured by flow cytometry, immune cell infiltration and activation were significantly greater in the spinal cord (phagocytic myeloid cells and microglia) and dorsal root ganglia (Ly6C+ monocytes) following compression injury. We also decided to investigate the gastrointestinal microbiome, as it has been shown to be altered in SCI patients and has recently been shown to play a role in immune system maturation and pain. We found increased dysbiosis of the gastrointestinal microbiome in an injury severity-dependent manner. The use of this contusion-compression model of SCI may help advance the preclinical assessment of acute and chronic SCI pain and lead to a better understanding of mechanisms contributing to this pain.

Internal consistency and convergent validity of the International Spinal Cord Injury Quality of Life Basic Data Set at discharge from first rehabilitation

STUDY DESIGN

This study is a cross-sectional analysis using data from the Swiss Spinal Cord Injury Cohort Study.

OBJECTIVES

To examine internal consistency and convergent validity of the International Spinal Cord Injury Quality of Life Basic Data Set (QoL-BDS) at discharge from first inpatient rehabilitation.

SETTING

The study was performed at four rehabilitation centers in Switzerland.

METHODS

Participants were Swiss residents aged over 16 years newly diagnosed with traumatic or non-traumatic spinal cord injury (SCI). Measures included the QoL-BDS, World Health Organization Quality of Life (WHOQOL) items, Hospital Anxiety and Depression Scale (HADS), and Spinal Cord Independence Measure III (SCIM).

RESULTS

A total of 495 participants were included. In all, 57% had a traumatic SCI, 71.1% a motor complete SCI, and 33.3% had tetraplegia. Mean age was 53 (SD = 16.4) years and 68% were male. No floor or ceiling effects were found. Inter-correlations were strong (0.73-0.80) and Cronbach's alpha was good (0.88). QoL-BDS mean scores were 6.4 (SD = 2.2) for life satisfaction, 5.8 (SD = 2.4) for physical health, 6.9 (SD = 2.4) for psychological health, and 6.4 (SD = 2.1) for total QoL. Correlations with reference measures were strongest for QoL-BDS total and WHOQOL general quality of life (r = 0.67), QoL-BDS physical health and WHOQOL health and daily activities (r = 0.64 and 0.53), and QoL-BDS psychological health and HADS depression and anxiety (r = -0.64 and -0.69). SCIM correlated weakly with all QoL-BDS items.

CONCLUSIONS

The QoL-BDS revealed no floor or ceiling effects and demonstrated good internal consistency and convergent validity in individuals with SCI assessed at discharge from first rehabilitation. This study supports the clinical routine use of the QoL-BDS.

Supraspinal nociceptive networks in neuropathic pain after spinal cord injury

Neuropathic pain following spinal cord injury involves plastic changes along the whole neuroaxis. Current neuroimaging studies have identified grey matter volume (GMV) and resting-state functional connectivity changes of pain processing regions related to neuropathic pain intensity in spinal cord injury subjects. However, the relationship between the underlying neural processes and pain extent, a complementary characteristic of neuropathic pain, is unknown. We therefore aimed to reveal the neural markers of widespread neuropathic pain in spinal cord injury subjects and hypothesized that those with greater pain extent will show higher GMV and stronger connectivity within pain related regions. Thus, 29 chronic paraplegic subjects and 25 healthy controls underwent clinical and electrophysiological examinations combined with neuroimaging. Paraplegics were demarcated based on neuropathic pain and were thoroughly matched demographically. Our findings indicate that (a) spinal cord injury subjects with neuropathic pain display stronger connectivity between prefrontal cortices and regions involved with sensory integration and multimodal processing, (b) greater neuropathic pain extent, is associated with stronger connectivity between the posterior insular cortex and thalamic sub-regions which partake in the lateral pain system and (c) greater intensity of neuropathic pain is related to stronger connectivity of regions involved with multimodal integration and the affective-motivational component of pain. Overall, this study provides neuroimaging evidence that the pain phenotype of spinal cord injury subjects is related to the underlying function of their resting brain.

Which factors have an association to the Quality of Life (QoL) of people with acquired Spinal Cord Injury (SCI)? A cross-sectional explorative observational study

STUDY DESIGN

Cross-sectional explorative observational study.

OBJECTIVES

To identify factors which have an association to the self-perceived Quality of Life (QoL) for persons with acquired spinal cord injury (SCI).

SETTING

Eight specialized SCI-centers in Germany. The GerSCI survey is the German part of the International Spinal Cord Injury Survey (InSCI).

METHODS

Self-disclosure questionnaire, created from the InSCI group, translated and adapted for Germany. The questionnaire collects a very broad range of data and, and due to its design as a self-report, is particularly suitable for the analysis on QoL. Because of the content, which is binding for all participating states, it allows a direct comparability of the results. Included in Germany were 1479 persons with acquired SCI aged 18 years and older.

RESULTS

Various factors were identified with high associations to QoL, including changeable and unchangeable ones, such as those of particular importance: pain, sleep problems, sexual dysfunction, age, and time since onset of SCI. Some results confirmed reports of previous studies, others were surprising.

CONCLUSION

this study provides an important basis for the planned analysis of the InSCI participating countries in the 6 WHO regions. Germany was able to contribute the largest study population. The concrete study design of InSCI allows us to directly compare data and helps us to improve ourselves within the framework of a "learning health system". Medical measures can be orientated towards the found results, in order to ensure the best possible care and support by the therapeutic team, individually adapted to the person, place of residence and impairment.

Differences in functional improvement based on history of substance abuse and pain severity following spinal cord injury

Background: This study explored the relationship between history of substance abuse and pain severity during inpatient rehabilitation following traumatic spinal cord injury (SCI). Methods: Secondary analysis of a prospective longitudinal study. An adjusted general linear model was used to examine differences in functional improvement based on history of substance abuse and pain severity. Results: Over 50% of the sample had a history of substance abuse, and 94% reported moderate or severe pain. There was a significant interaction between the history of substance abuse and pain severity (p = 0.01, partial η² = 0.012). A difference in functional improvement was found among individuals who reported low pain; those with a history of substance abuse achieved less functional improvement than those without a history of substance abuse, M = 5.32, SE = 1.95, 95% CI 0.64-10.01. Conclusions: A history of substance abuse and post-injury pain are prevalent among individuals with SCI in rehabilitation, and there may be a meaningful relationship between these two patient characteristics and functional improvement. The results provide potential new insights into the characteristics of vulnerable subpopulations during SCI rehabilitation. Furthering our understanding of these results warrants future investigation to prevent and minimize poor outcomes among vulnerable SCI patients.

Considerations on the psychometric properties and validity of the Spinal Cord Injury Secondary Conditons Scale

STUDY DESIGN

Cross-sectional validation study.

OBJECTIVES

Explore psychometric properties of Spinal Cord Injury Secondary Conditions Scale (SCI-SCS).

SETTING

Two Scandinavian rehabilitation centres.

METHODS

Included were 224 consecutive patients attending regular follow-up at least 1 year after a traumatic SCI. Mean age was 49.6 (SD 14.9) years. SCI-SCS floor and ceiling effect examined. Construct validity was investigated by confirmatory factor analysis and correlation analysis, and reliability by Cronbach's alpha.

RESULTS

SCI-SCS showed no floor or ceiling effect. Two out of four earlier reported latent factors ("Genitourinary and bowel", "Muscle structures and pain") were confirmed. The global Cronbach's alpha of SCI-SCS was 0.65 and 0.22-0.61 for the four latent factors. The SCI-SCS sum score showed low correlation to quality of life (QoL) measured by EQ5 VAS (r_s = -0.47, p < 0.001). Likewise, the sum score correlations to QoL-general and QoL-physical health (International SCI QoL Basic Dataset) were low (r_s = -0.36, p < 0.001 and r_s = -0.37, p < 0.001, respectively). The scale item Muscle Spasms correlated moderately to ratings on Spasm Frequency (r_s = 0.59, p < 0.001) and Spasm Intensity (r_s = 0.56, p < 0.001) scales. Chronic Pain and Joint and Muscle Pain correlated to patient reported number of pain sites and level of pain (International SCI Pain Basic Dataset 1.0) (r_s = 0.31 p < 0.001 and r_s = 0.47, p < 0.001, respectively).

CONCLUSION

SCI-SCS is a relevant instrument for giving clinicians and researchers an overview of the individual recent experiences with secondary conditions. However, the instrument could benefit from a clearer definition of the construct secondary conditions, a scale revision and a consideration of whether to add other experienced secondary conditions.

Specific Electroencephalographic Signatures for Pain and Descending Pain Inhibitory System in Spinal Cord Injury

OBJECTIVES

The pain related to Spinal Cord Injury (SCI) is difficult to treat and it is associated with significant morbidity. One aspect to improve therapeutics is to explore markers of pain and its correlates in SCI.

METHODS

In this cross-sectional neurophysiological analysis of a randomized, double-blind controlled trial, thirty-nine patients with SCI were included. We analyzed conditioned pain modulation (CPM) efficiency as the index of the descending pain inhibitory system, EEG variables, and clinical pain levels as measured by the Visual Analogue Scale. Regression analyses were performed to assess the relationship among EEG variables, pain levels, and CPM.

RESULTS

We included 39 SCI patients, 74% reported SCI-related pain. We found that (1)less alpha and beta power are related to pain presence, (2)less alpha and beta power are associated with higher pain levels among patients with pain, (3)patients with pain have decreased peak alpha-theta frequency compared to no-pain group, (4)more relative theta power are related to the presence of low CPM efficiency, (5)higher relative theta power is associated with lower CPM efficiency.

CONCLUSIONS

Our results confirm and provide additional data on the relationship between decreased alpha and beta frequencies and higher pain levels. One important finding, though, was a specific and different EEG signature for the descending inhibitory pain system, as we showed that increased theta EEG power is related to decreased CPM efficiency; suggesting that, although low CPM efficiency plays a major role in pain in these participants, it does seem to be associated with a specific oscillatory brain rhythm different from clinical pain. These findings have significant implications for future research on EEG-based biomarkers of pain in post-SCI and new interventions as neurofeedback to manage pain in this population.

The Efficiency of Spa Rehabilitation in Chronic Ischemic Stroke Patients-Preliminary Reports

Background: Rehabilitation-oriented therapy after a stroke must continue in various forms as a life-long effort. Aim: The study investigated the impact of spa rehabilitation on the quality of life and functional efficiency in patients after an ischemic stroke at a chronic stage of recovery. Methods: The assessment was carried out in a spa resort in southeastern Poland. It involved 32 patients with strokes who participated in a three-week rehabilitation program. Three examinations were performed: upon admission, on the day of discharge and at a two-month follow-up. The quality of life and functional efficiency were assessed with the WHOQOL-BREF and Barthel Index. Results: The quality of life was significantly higher in Exam II compared with Exam I (p < 0.001), and improvement was retained at the follow-up. The Barthel scores were higher in Exam II compared with Exam I (79.84 vs. 68.59), while the differences between the scores in Exams II and III were small (p = 0.039). Conclusions: Three-week spa rehabilitation seems to favorably affect the functional efficiency and quality of life after a stroke. The effects appear to be long-term. The gender, age and time from stroke onset do not seem to impact short-term effects. However, long-term effects are related to the time from stroke onset.

Physical activity interventions, chronic pain, and subjective well-being among persons with spinal cord injury: a systematic scoping review

STUDY DESIGN

Scoping review of experimental and quasi-experimental studies.

OBJECTIVE

To systematically synthesize research testing the effects of leisure time physical activity (LTPA) interventions on chronic pain and subjective well-being (SWB) among adults with spinal cord injury (SCI).

METHODS

Literature searches were conducted using multiple databases (Web of Science, Embase, CINAHL, Medline, PsychINFO and SPORTDiscus) to identify studies involving persons with SCI that measured and reported the effects of LTPA interventions on both chronic pain and at least one measure of SWB (e.g., affect, life satisfaction, satisfaction with various life domains). Relevant data were extracted from the studies and synthesized.

RESULTS

A total of 3494 articles were screened. Fifteen published articles, consisting of 12 different studies met the review inclusion criteria. Four different patterns of findings were observed regarding the effect of LTPA on chronic pain and SWB outcomes: (1) increased chronic pain, decreased SWB (1 article); (2) decreased chronic pain, improved SWB (12 articles); (3) increased chronic pain, improved SWB (1 article); and (4) unchanged levels of pain, improved SWB (1 article).

CONCLUSIONS

Results of most articles included in this scoping review suggest that LTPA interventions can reduce chronic pain and improve SWB for persons with SCI. Further research is needed to identify the mechanisms by which LTPA affects pain and SWB, in order to formulate LTPA prescriptions that maximize improvements in these outcomes.

The gut-brain axis and beyond: Microbiome control of spinal cord injury pain in humans and rodents

Spinal cord injury (SCI) is a devastating injury to the central nervous system in which 60 to 80% of patients experience chronic pain. Unfortunately, this pain is notoriously difficult to treat, with few effective options currently available. Patients are also commonly faced with various compounding injuries and medical challenges, often requiring frequent hospitalization and antibiotic treatment. Change in the gut microbiome from the "normal" state to one of imbalance, referred to as gut dysbiosis, has been found in both patients and rodent models following SCI. Similarities exist in the bacterial changes observed after SCI and other diseases with chronic pain as an outcome. These changes cause a shift in the regulation of inflammation, causing immune cell activation and secretion of inflammatory mediators that likely contribute to the generation/maintenance of SCI pain. Therefore, correcting gut dysbiosis may be used as a tool towards providing patients with effective pain management and improved quality of life.

The Danish Spinal Cord Injury Shoulder (DanSCIS) cohort: methodology and primary results

STUDY DESIGN

Cross-sectional study.

OBJECTIVES

To describe the socio-demographics, injury characteristics, prevalence of shoulder and neck symptoms, weekly participation in leisure time physical activity (LTPA) and quality of life (QoL) of individuals with spinal cord injury in Denmark (SCI).

SETTING

Nation-wide community survey, Denmark.

METHODS

Individuals with SCI for >2 years were included from three SCI rehabilitation departments. Questionnaire data regarding socio-demographic details, SCI injury characteristics, medical history, shoulder and neck symptoms, LTPA and QoL were collected.

RESULTS

Of 2454 potential participants, 1517 (62%) responded to the survey (mean age = 56.2, SD 16.1, 37% female, 42% tetraplegia, 23% complete SCI, mean time since injury = 16.9, SD 13.5). 75% used some form of assistive mobility device. Responders and non-responders showed no sex or injury type/severity differences. Shoulder and neck symptoms within the past 3 months were reported by 63 and 67% respectively, with 51% reporting shoulder symptoms within the past week. Among those with symptoms, 61% had experienced shoulder symptoms and 56% neck symptoms, for more than 30 days during the previous 3 months. Symptoms often prevented participants from performing their usual activities (due to shoulder symptoms 46%, neck symptoms 41%).

CONCLUSIONS

A high prevalence of self-reported shoulder and neck symptoms was found, which may limit physical function and social activities. We succeeded in generating the Danish Spinal Cord Injury Shoulder (DanSCIS) dataset, which comprised a substantial proportion of Danish adults with SCI. Future studies using data from this cohort will investigate patterns and associations between shoulder/neck symptoms, use of assistive mobility devices, LTPA and QoL.

Neuropathic pain in spinal cord injury: topical analgesics as a possible treatment

STUDY DESIGN

Review of the literature and semi-structured interviews.

OBJECTIVE

To explore the possible use of topical analgesics for the treatment of neuropathic pain (NP) in spinal cord injury (SCI).

SETTING

Institute for Neuropathic Pain, Soest, The Netherlands.

METHODS

A review was performed of studies on topical analgesics for SCI-related NP published up to May 2019. In addition, eight persons with SCI-related NP who were treated with topical analgesics were interviewed in a semi-structured interview on their experience with topical analgesics.

RESULTS

Seven studies (five case reports and two case series) were found that evaluated the use of topical analgesics for SCI-related NP. None of the studies used a control treatment. Topical analgesics included baclofen, ketamine, lidocaine, capsaicin, and isosorbide dinitrate. All studies reported a decrease in NP over time. Persons interviewed were 49-72 years of age and all but one had an incomplete SCI. They used topical agents containing phenytoin, amitriptyline, baclofen, ketamine or loperamide. All showed a decrease in pain of at least 3 points on the 11-point numeric rating scale during this treatment.

DISCUSSION/CONCLUSIONS

Evidence on the use of topical analgesics in SCI is scarce. Case reports, case series and interviews suggest that the use of topical analgesics can be beneficial in treating SCI-related NP. Placebo-controlled studies are required to investigate the effect of topical analgesics on SCI-related NP.

Considerations for Studying Sex as a Biological Variable in Spinal Cord Injury

In response to NIH initiatives to investigate sex as a biological variable in preclinical animal studies, researchers have increased their focus on male and female differences in neurotrauma. Inclusion of both sexes when modeling neurotrauma is leading to the identification of novel areas for therapeutic and scientific exploitation. Here, we review the organizational and activational effects of sex hormones on recovery from injury and how these changes impact the long-term health of spinal cord injury (SCI) patients. When determining how sex affects SCI it remains imperative to expand outcomes beyond locomotor recovery and consider other complications plaguing the quality of life of patients with SCI. Interestingly, the SCI field predominately utilizes female rodents for basic science research which contrasts most other male-biased research fields. We discuss the unique caveats this creates to the translatability of preclinical research in the SCI field. We also review current clinical and preclinical data examining sex as biological variable in SCI. Further, we report how technical considerations such as housing, size, care management, and age, confound the interpretation of sex-specific effects in animal studies of SCI. We have uncovered novel findings regarding how age differentially affects mortality and injury-induced anemia in males and females after SCI, and further identified estrus cycle dysfunction in mice after injury. Emerging concepts underlying sexually dimorphic responses to therapy are also discussed. Through a combination of literature review and primary research observations we present a practical guide for considering and incorporating sex as biological variable in preclinical neurotrauma studies.

Characterization of pain syndromes in patients with neuromyelitis optica

BACKGROUND

Pain is common and refractory in spinal cord injury (SCI). Currently, most studies evaluated pain in male-predominant traumatic-SCI. Also, concomitant secondary pain syndromes and its temporal evolution were seldom reported.

METHODS

We aimed to prospectively describe the main and secondary pain and its associated factors in inflammatory-SCI evaluating neuromyelitis optica (NMO) patients. In-remission NMO patients underwent neurological, imaging and autoantibody evaluations. Questionnaires detailing main and secondary pains, functional state, mood, catastrophizing, quality of life (QoL) and "non-motor symptoms" were used at two time points.

RESULTS

Pain was present in 53 (73.6%) of the 72 patients included. At-level neuropathic pain was the most common main pain syndrome, affecting 32 subjects (60.4% of those with pain). Over 70% (n = 38) of this cohort reported two pain syndromes. Those without pain were significantly younger (26.1 ± 12.7 y.o. in those without pain and 40.1 ± 12.5, 37.2 ± 11.4 y.o. in those whose main pain was neuropathic and non-neuropathic, respectively, p = .001), and no differences in the inflammatory status were observed between groups. On follow-up, one-fifth (n = 11) had a different main pain syndrome from the first visit. Pain impacted QoL as much as disability and motor strength.

CONCLUSION

Pain is a prevalent and disabling non-motor symptom in NMO-SCI. Most patients experience more than one pain syndrome which can change in time even in the absence of clinical relapse. Age of the inflammatory-SCI was a major determinant of pain. Acknowledging temporal changes and multiplicity of pain syndromes in NMO-SCI may give insights into more precise designs of clinical trials and general management of pain in SCI.

SIGNIFICANCE

In this longitudinal study with NMO-related SCI, pain affected almost three-quarters of patients with NMO. Over 70% have more than one pain syndrome and at-level neuropathic pain is the most common type of pain syndrome. Patients without pain were significantly younger but had the same burden of inflammatory lesions than those with pain. During follow-up, up to one fifth of patients presented with changes in the main pain syndromes, which can occur even in the absence of clinical activity of the inflammatory disease. In this cohort, Pain affected quality of life as much as disability or motor strength.

Quality of life of persons with traumatic spinal cord injury in rural Kilimanjaro, Tanzania: a community survey

AIM

To describe the quality of life of persons with traumatic spinal cord injury (TSCI) in a rural area of a low-income country.

METHODS

This was a cross-sectional descriptive study in which snowballing was used to identify persons with TSCI in their homes. A Kiswahili version of the short version of the World Health Organization quality of life questionnaire was used for data collection. Data were analyzed descriptively and independent samples t-tests were used to calculate the difference in the mean scores between groups.

RESULTS

Eighty persons with TSCI with a mean age of 42.29 ± 11.4 years were identified, 68.8% of whom were males. The highest scoring domains were psychological (12.76 ± 2.55) and social relationships (12.62 ± 2.95). The lowest scores were for physical (11.48 ± 2.74) and environment (9.59 ± 2.68) domains. Significantly higher scores were associated with younger age in: physical (0.05), social relationships (0.01), and environment (0.02) domains (p value < 0.05).

CONCLUSIONS

Persons with TSCI in the Kilimanjaro rural area registered a relatively low quality of life in which the most affected domains are physical health and environment.Implications for rehabilitationQuality of life is the ultimate goal in the rehabilitation of persons with any irreversible disability such as spinal cord injury.It is important for rehabilitation professionals to know which domains of quality of life are most affected among persons with spinal cord injury.Rehabilitation professionals ought to understand and address physical health and environmental issues that affect persons with traumatic spinal cord injury in rural resource-constrained areas.Addressing physical health and environmental challenges for persons with spinal cord injury in resource-constrained rural areas require involvement of the family, rehabilitation personnel, policy makers, and the community.

Pain inhibition through transplantation of fetal neuronal progenitors into the injured spinal cord in rats

Neuropathic pain after spinal cord injury (SCI) is a complex condition that responds poorly to usual treatments. Cell transplantation represents a promising therapy; nevertheless, the ideal cell type in terms of neurogenic potential and effectiveness against pain remains largely controversial. Here, we evaluated the ability of fetal neural stem cells (fNSC) to relieve chronic pain and, secondarily, their effects on motor recovery. Adult Wistar rats with traumatic SCI were treated, 10 days after injury, with intra-spinal injections of culture medium (sham) or fNSCs extracted from telencephalic vesicles (TV group) or the ventral medulla (VM group) of E/14 embryos. Sensory (von Frey filaments and hot plate) and motor (the Basso, Beattie, Bresnahan locomotor rating scale and inclined plane test) assessments were performed during 8 weeks. Thereafter, spinal cords were processed for immunofluorescence and transplanted cells were quantified by stereology. The results showed improvement of thermal hyperalgesia in the TV and VM groups at 4 and 5 weeks after transplantation, respectively. Moreover, mechanical allodynia improved in both the TV and VM groups at 8 weeks. No significant motor recovery was observed in the TV or VM groups compared with sham. Stereological analyses showed that ~70% of TV and VM cells differentiated into NeuN⁺ neurons, with a high proportion of enkephalinergic and GABAergic cells in the TV group and enkephalinergic and serotoninergic cells in the VM group. Our study suggests that neuronal precursors from TV and VM, once implanted into the injured spinal cord, maturate into different neuronal subtypes, mainly GABAergic, serotoninergic, and enkephalinergic, and all subtypes alleviate pain, despite no significant motor recovery. The study was approved by the Animal Ethics Committee of the Medical School of the University of São Paulo (protocol number 033/14) on March 4, 2016.