Prediction of thigh skeletal muscle mass using dual energy x-ray absorptiometry compared to magnetic resonance imaging after spinal cord injury

Objectives: A rapid decline in lean mass (LM), fat-free mass (FFM) and increased intramuscular fat (IMF) predispose persons with spinal cord injury (SCI) to chronic medical conditions including dyslipidemia, insulin resistance, type 2 diabetes mellitus and cardiovascular disease. (1) To determine the relationship between dual energy x ray absorptiometry (DXA) and gold standard magnetic resonance imaging (MRI) LM values; (2) to develop predictive equations based on this relationship for assessing thigh LM in persons with chronic SCI.

Study Design: Cross-sectional predicational design.

Settings: Clinical research medical center.

Participants: Thirty-two men with chronic (>1 y post-injury) motor complete SCI.

Methods: Participants completed total body DXA scans to determine thigh LM and were compared to measurements acquired from trans-axial MRI.

Outcome measures: MRI was used to measure whole muscle mass (MM_MRI-WM), absolute muscle mass (MM_MRI-ABS) after excluding IMF, and knee extensor muscle mass (MM_MRI-KE). DXA was used to measure thigh LM (LM_DXA) and (FFM_DXA). To predict MM_MRI-KE, LM_DXA was multiplied by 0.52 and yielded LM_DXA-KE.

Results: LM_DXA predicted MM_MRI-WM [r²_?=?0.90, standard error of the estimate (SEE)?=?0.23?kg, P?<?0.0001] and MM_MRI-ABS (r²?=?0.82, SEE?=?0.28?kg, P?<?0.0001). LM_DXA-KE predicted MM_MRI-KE (r²?=?0.78, SEE?=?0.16?kg, P?<?0.0001).

Conclusion: DXA measurements revealed an acceptable agreement with the gold standard MRI and may be a viable alternative for assessing thigh skeletal muscle mass after SCI.     

Secondary conditions in a community sample of people with spinal cord damage

Objective: To compare secondary conditions in people with traumatic spinal cord injury (SCI) and non-traumatic spinal cord dysfunction (SCDys).

Design: Survey; completed August 2012 – June 2013.

Setting: Community, Australia.

Participants: Adults with spinal cord damage from any cause.

Interventions: Nil.

Outcome Measures: Demographic and clinical variables and the SCI-Secondary Conditions Scale (SCI-SCS).

Results: Survey completed by 150 people: 112 (74.7%) with traumatic SCI and 38 (25.3%) with non-traumatic SCDys a median of 10 years post onset. No significant difference (t?=?–0.6, P?=?0.6) in the total SCI-SCS score between those with SCI (mean 13.7) and SCDys (mean 14.4). Except for bladder problems (SCDys mean?=?1.5, SD?=?1.1; SCI mean?=?1.0, SD=1.1; t?=?–2.6, P?=?0.01) there were no significant differences between the aetiology groups regarding the conditions comprising the SCI-SCS (all other P values >0.1). The most common significant or chronic problems from the SCI-SCS were: sexual problems 41%; chronic pain 24%; bladder dysfunction 17%; spasms 17%; joint and muscle pain 15%; bowel dysfunction 14%; circulation problems 14%; contractures 9%; urinary tract infections 9%; pressure ulcer 7% and postural hypotension 5%. A linear regression analysis found that tetraplegia and higher disability were the only variables that significantly influenced (R²?=?0.13; P?=?0.005) the total SCI-SCS score and that sex, age, years post injury and etiology of spinal cord damage had no influence.

Conclusions: Secondary conditions following spinal cord damage do not appear to be influenced by etiology. Prevention and management of secondary conditions following need to consider people with non-traumatic SCDys as well as those with traumatic SCI.     

Changes in alcohol use after the onset of spinal cord injury

Objective: Identify the prevalence of alcohol consumption and binge drinking at time of spinal cord injury (SCI) onset, compare these rates to data from the general population, and identify changes in alcohol use at an average of 17 months post-injury.

Design: Cross sectional, mailed self-report assessment.

Setting: A specialty hospital in the southeastern United States.

Participants: Five hundred sixty-six inpatients completed the baseline measure. After eliminating those under age 18, there were 524 participants at baseline. 410 were approached for follow-up, with 201 of those responding.

Interventions: N/A.

Outcome Measures: Self-reported assessments were completed during inpatient rehabilitation and at follow-up approximately 17 months later. The two primary outcomes were the number of days consuming 5 or more drinks (binge drinking) and the number of days consuming any alcoholic beverages within the 30 days prior to the assessment. Comparison data were taken from the Behavioral Risk Factor Surveillance System.

Results: At SCI onset, the prevalence of alcohol use, particularly binge drinking, was substantially higher than the general population (SCI?=?44.9%; general population?=?13%). Drinking rates decreased by 17 months post-injury.

Conclusion: Alcohol use and binge drinking are elevated over the general population at the time of injury. Drinking patterns reflect a decrease following injury but remain slightly elevated, signifying a need for interventions to minimize long-term health consequences.     

Cross-validity of one maximum repetition predictive equation for men with spinal cord injury

Objectives: The study aimed to test the cross-validation of a specific one maximum repetition (1RM) predictive equation based on the 4- to 12-maximum repetition test (4-12RM) for men with spinal cord injury (SCI).

Study design: Cross-sectional study.

Setting: Rehabilitation Hospital Network.

Participants: Fifty-eight men aged 31.9 (20.0–38.0) years (median and quartile) with SCI were enrolled in the study.

Interventions: None.

Outcomes measures: Volunteers were tested in 1RM test or 4-12RM of the bench press exercise with 2–3 interval days in a random order. The intraclass correlation coefficient (ICC) with Bland Altman plot was used to compare a specific predictive equation (SPE) and six current predictive equations (CPE) based on the 4- to 12-maximum repetition with the 1RM test.

Results: The SPE showed the highest intraclass correlation coefficient (ICC?=?0.91; 95%CI 0.85–0.95), the smallest range of the interval around the differences (Δ?=?36.6) and the second lowest mean difference between 1RM test and 1RM predictive equation (?2.4?kg). The CPE3 presented the lowest mean difference (?1.6?kg). All intraclass correlations’ predictive equations were classified as excellent.

Conclusion: The SPE presented a suitable and satisfactory validity to assess men with SCI at the bench press exercise. Thus, the equation is an accurate method to predict 1RM in SCI.     

Oral probenecid improves sperm motility in men with spinal cord injury

Study Design: Prospective cohort study (twenty men with spinal cord injury [SCI]).

Objective: Determine if administration of oral probenecid results in improved sperm motility in men with SCI.

Setting: Major university medical center.

Methods: Twenty men with SCI were administered probenecid for 4 weeks (250?mg twice a day for 1 week, followed by 500?mg twice a day for 3 weeks). Semen quality was assessed at three time points: pre-treatment, post-treatment (immediately after the 4-week treatment), and follow-up (4 weeks after the last pill was ingested).

Result(s): Probenecid was well-tolerated by all subjects. Sperm motility improved in each subject after 4 weeks of oral probenecid. The mean percent of sperm with progressive motility increased from 19% to 26% (P < 0.05). A more striking increase was seen in the mean percent of sperm with rapid linear motility, from 5% to 17%, (P <0.001). This improvement continued into the four week follow up period. Similar improvements were seen in the total motile sperm count (15 million, 28 million, and 27 million at pre-treatment, post-treatment, and follow-up, respectively). Sperm concentration was not significantly different at pre-treatment, post-treatment, and follow-up, (52 million, 53 million and 53 million, respectively).

Conclusion: This study showed that administration of an oral agent (probenecid) known to interfere with the pannexin-1 cellular membrane channel, can improve sperm motility in men with spinal cord injury. It is the first study to report improved sperm motility after oral medication in men with SCI.     

Utilization and access to healthcare services among community-dwelling people living with spinal cord injury

Objective: Describe the utilization, accessibility, and satisfaction of primary and preventative health-care services of community-dwelling individuals with spinal cord injury (SCI).

Design: Cross sectional, in-person or telephonic survey, utilizing a convenience sample.

Setting: Community.

Participants: Individuals with SCI greater than 12-months post injury.

Interventions: N/A.

Outcome measures: Demographic, injury related, and 34-item questionnaire of healthcare utilization, accessibility, and satisfaction with services.

Results: The final sample consisted of 142 participants (50 female, 92 male). Ninety-nine percent of respondents had a healthcare visit in the past 12-months with primary care physicians (79%), with SCI physiatrists (77%) and urologists (50%) being the most utilized. 43% of the sample reported an ER visit within the past 12-months, with 21% reporting multiple visits. People who visited the ER had completed significantly less secondary education (P?=?0.0386) and had a lower estimate of socioeconomic status (P?=?0.017). The majority of individuals (66%) were satisfied with their primary care physician and 100% were satisfied with their SCI physiatrist. Individuals who did not visit an SCI physiatrist were significantly more likely to live in a rural area (P?=?0.0075), not have private insurance (P?=?0.0001), and experience a greater decrease in income post injury (P?=?0.010).

Conclusion: The delivery of care for people with SCI with low socioeconomic status may be remodeled to include patient-centered medical homes where care is directed by an SCI physiatrist. Further increased telehealth efforts would allow for SCI physiatrists to monitor health conditions remotely and focus on preventative treatment.     

Interval training elicits higher enjoyment versus moderate exercise in persons with spinal cord injury

Background: High intensity interval training (HIIT) is a robust and time-efficient approach to improve multiple health indices including maximal oxygen uptake (VO₂max). Despite the intense nature of HIIT, data in untrained adults report greater enjoyment of HIIT versus continuous exercise (CEX). However, this has yet to be investigated in persons with spinal cord injury (SCI).

Objective: To examine differences in enjoyment in response to CEX and HIIT in persons with SCI.

Design: Repeated measures, within-subjects design.

Setting: University laboratory in San Diego, CA.

Participants: Nine habitually active men and women (age?=?33.3?±?10.5 years) with chronic SCI.

Intervention: Participants performed progressive arm ergometry to volitional exhaustion to determine VO₂peak. During subsequent sessions, they completed CEX, sprint interval training (SIT), or HIIT in randomized order.

Outcome Measures: Physical activity enjoyment (PACES), affect, rating of perceived exertion (RPE), VO₂, and blood lactate concentration (BLa) were measured.

Results: Despite a higher VO₂, RPE, and BLa consequent with HIIT and SIT (P?, PACES was significantly higher (P?=?0.03) in response to HIIT (107.4?±?13.4) and SIT (103.7?±?12.5) compared to CEX (81.6?±?25.4). Fifty-five percent of participants preferred HIIT and 45% preferred SIT, with none identifying CEX as their preferred exercise mode.

Conclusion: Compared to CEX, brief sessions of submaximal or supramaximal interval training elicit higher enjoyment despite higher metabolic strain. The long-term efficacy and feasibility of HIIT in this population should be explored considering that it is not viewed as more aversive than CEX.     

Changes in nutrient intake and inflammation following an anti-inflammatory diet in spinal cord injury

Objective: The objective of the current study was to describe the observed changes in nutrient intakes following a 3-month anti-inflammatory diet, and to explore potential relationships between the change in nutrients and the change in various inflammatory mediators.

Design: A secondary analysis of a prior randomized controlled clinical trial.

Setting: Individuals with SCI within the Niagara region.

Participants: Twenty individuals with various levels and severities of SCI.

Intervention: Three-month anti-inflammatory diet.

Outcome Measures: The change in nutrient intake and corresponding changes to various inflammatory mediators.

Results: The treatment group demonstrated a significant reduction in fat intake (P?=?0.02), a significant increase in protein intake (P?=?0.02), and no change in carbohydrates (P?=?0.23) or energy intake (P?=?0.10). The treatment group showed a significant increase in some nutrients with established anti-inflammatory properties including vitamins A, C, and E, and omega-3 fatty acids (P?<?0.01). Significant reductions in proinflammatory nutrients were observed including trans fatty acids (P?=?0.05), caffeine (P?<?0.01), and sodium (P?=?0.02). The treatment group also showed significant reductions in the proinflammatory mediators interferon-y (P?=?0.01), interleukin-1β (P?<?0.01), and interleukin-6 (P?<?0.05). Further, several proinflammatory mediators were negatively correlated with anti-inflammatory nutrients, including vitamin A, carotenoids, omega-3 fatty acids, and zinc.

Conclusion: This study provides evidence that dietary alterations are effective at reducing chronic inflammation in individuals with SCI and provides a preliminary assessment of the related nutrient changes.     

Incidence And Clinical Correlates Of Increased Serum Creatine Kinase Levels In Persons With Spinal Cord Injury

Abstract

Background: Elevated plasma levels of creatine kinase (CPK) are found in various neuromuscular conditions as a result of muscle damage and necrosis. Elevated CPK has also been described in elite wheelchair athletes and in able-bodied individuals after strenuous exercise.

Methods: The incidence of elevated CPK in individuals with spinal cord injury (SCI) has not been well established. We reviewed laboratory data from 581 individuals with chronic SCI.

Results: Most individuals with SCI (73.3%) had CPK values within 95% confidence intervals for able-bodied individuals. The highest levels were seen in African Americans (21% had CPK values > 95 confidence intervals for able-bodied individuals). Significant associations between CPK and the following independent variables were identified: impairment group, gender, duration of injury, body mass index, and ethnic group. Multiple regression analysis revealed significant correlations between CPK and oxygen consumption (beta .37, P < .01) in 32 individuals who performed the exercise test.

Conclusions: These findings are important for clinicians evaluating symptoms of fatigue and myopathy in individuals with SCI.     

Rehabilitation Interventions to modify endocrine-metabolic disease risk in Individuals with chronic Spinal cord injury living in the Community (RIISC): A systematic review and scoping perspective

Context: Endocrine-metabolic disease (EMD) risk following spinal cord injury (SCI) is associated with significant multi-morbidity (i.e. fracture, diabetes, heart disease), mortality, and economic burden. It is unclear to what extent rehabilitation interventions can modify EMD risk and improve health status in community-dwelling adults with chronic SCI.

Objectives: To characterize rehabilitation interventions and summarize evidence on their efficacy/effectiveness to modify precursors to EMD risk in community-dwelling adults with chronic SCI.

Methods: Systematic searches of MEDLINE PubMed, EMBASE Ovid, CINAHL, CDSR, and PsychInfo were completed. All randomized, quasi-experimental, and prospective controlled trials comparing rehabilitation/therapeutic interventions with control/placebo interventions in adults with chronic SCI were eligible. Two authors independently selected studies and abstracted data. Mean differences of change from baseline were reported for EMD risk outcomes. The GRADE approach was used to rate the quality of evidence.

Results: Of 489 articles identified, 16 articles (11 studies; n=396) were eligible for inclusion. No studies assessed the effects of rehabilitation interventions on incident fragility fractures, heart disease, and/or diabetes. Individual studies reported that exercise and/or nutrition interventions could improve anthropometric indices, body composition/adiposity, and biomarkers. However, there were also reports of non-statistically significant between-group differences.

Conclusions: There was very low-quality evidence that rehabilitation interventions can improve precursors to EMD risk in community-dwelling adults with chronic SCI. The small number of studies, imprecise estimates, and inconsistency across studies limited our ability to make conclusions. A high-quality longitudinal intervention trial is needed to inform community-based rehabilitation strategies for EMD risk after chronic SCI.     

Resting energy expenditure in male athletes with a spinal cord injury

Objective: To investigate whether there are differences in the resting energy expenditure (REE) and body composition of athletes with a spinal cord injury (SCI) compared to active able-bodied controls.

Design: In this cross sectional study, male athletes with a SCI were compared to active able-bodied controls matched for age, stretch stature and body mass. In addition, the accuracy of standard REE prediction equations in estimating REE was assessed.

Participants: Seven male wheelchair athletes with a SCI and six matched active able-bodied controls volunteered to participate.

Outcome measures: REE was measured using indirect calorimetry and estimated using population-specific prediction equations. Body composition (lean tissue mass, fat mass and bone mineral content) was measured by dual energy X-ray absorptiometry (DXA).

Results: While absolute and adjusted REE in the athletes with SCI was lower than controls, this difference was not significant (P?=?0.259). When adjusted for lean tissue mass (LTM), REE was significantly higher (P?=?0.038) in the athletes with SCI compared to the controls (146 ± 29kJ/kg LTM vs. 125 ± 8kJ/kg LTM). LTM was significantly lower in the athletes with SCI (44.35 ± 6.98?kg) compared to the able-bodied controls (56.02 ± 4.93?kg; P < 0.01). The differences between predicted and measured REE in the athletes with SCI were not statistically significant (except for the Owen equation), however there was no significant correlation between the measures.

Conclusion: This suggests that existing prediction equations used to estimate energy requirements may require modification for athletes with SCI.     

The combined effect of granulocyte-colony stimulating factor (G-CSF) treatment and exercise in rats with spinal cord injury

Objective: To identify that the combined G-CSF and treadmill exercise is more effective in functional recovery after spinal cord injury (SCI).

Design: Rats were divided into 4 groups: a SCI group treated with G-CSF (G-CSF group, n?=?6), a SCI group treated with treadmill exercise plus G-CSF (G-CSF/exercise group, n?=?6), a SCI group with treadmill exercise (exercise group, n?=?6), and a SCI group without treatments (control group, n?=?6). We performed laminectomy at the T8–10 spinal levels with compression injury of the spinal cord in all rats. G-CSF (20?μg/ml) was administered intraperitoneally for 5 consecutive days after SCI in G-CSF and G-CSF/exercise groups. From one week after surgery, animals in G-CSF/exercise and exercise groups received 30?min of exercise 5 days per week for 4 weeks. Functional recoveries were assessed using the Basso, Beattie, and Bresnahan (BBB) scale and the inclined plane test. Five weeks after SCI, hematoxylin and eosin staining for cavity size and immunohistochemistry for glial scar formation and neuro-regeneration factor expression were conducted.

Setting: Inha University School of medicine, Incheon, Korea

Results: Rats in G-CSF/exercise group showed the most effective functional recovery in the BBB scale and the inclined plane test, and spinal cord cavity size by injury were the smallest, and immunohistochemistry revealed expression of higher BDNF (brain-derived neurotrophic factor) and VEGF (vascular endothelial growth factor) and lower GFAP (glial fibrillary acidic protein) than others.

Conclusion: Combined treatment provided more effective neuroplasty and functional recovery than individual treatments.     

The analysis of serum lipid levels in patients with spinal cord injury

Study design: Retrospective study.

Objectives: The purposes of this investigation were to evaluate the serum lipid profile among a broad sample of patients with spinal cord injury (SCI), examining the impact of disease duration, lesion level, lesion grade and functional activity level on serum lipid levels of patients with SCI.

Setting: Ankara Physical Medicine and Rehabilitation Training and Research Hospital, Turkey.

Methods: Serum lipid profiles of 269 participants with SCI were analyzed and correlated to disease duration, lesion level, lesion grade and ambulation status.

Results: Total cholesterol (TC) was higher than normal in 21.2%, low density lipoprotein cholesterol in 24.4%, and triglycerides levels in 31% of the patients. The high density lipoprotein cholesterol (HDL-c) level was found to be lower than 40?mg/dl in 79.5% of the patients, TC/HDL-c ratio was 4.5 and above in 65.7% of the patients in our study. TC/HDL-c ratio was significantly higher in patients with SCI with a disease duration of 0–12 months than the group with a longer disease duration (P?=?0.009). TC/HDL-c ratio was significantly higher in patients who could not be community ambulated than the patients who were community ambulated (P?=?0.005). HDL-c levels in patients with motor complete SCI were significantly lower than patients with motor incomplete SCI (P?=?0.028).

Conclusion: Dyslipidemia is observed in a large number of patients with SCI. The risk of dyslipidemia was seen to have increased in motor complete SCI patients, in patients who can not be community ambulated and whose disease duration is between 0 to 12 months.     

Predictors of readmission to acute care during inpatient rehabilitation for non-traumatic spinal cord injury

Objectives: To investigate the frequency of and reasons for readmissions to acute care (RTAC) during inpatient rehabilitation (IPR) after non-traumatic spinal cord injury (NT-SCI). To develop a predictive model for RTAC using identified risk factors.

Design: Retrospective case-control.

Setting: Academic IPR hospital.

Participants: Individuals with NT-SCI admitted to an academic SCI rehabilitation unit from January 2014-December 2015.

Interventions: Not applicable.

Main Outcome Measures: Readmissions to acute care services from IPR.

Results: Thirty-seven participants (20%) experienced a RTAC for a total of 39 episodes. Thirty-five experienced 1 RTAC, while two had 2. The most common medical reasons for RTAC were infection (27%), neurological (27%), and noninfectious respiratory (16%). Multivariable logistic regression was used to develop a model to predict RTAC. Paraplegia was associated with 3.2 times increase in the odds of RTAC (P?=?0.03). For every unit increase in FIM-Motor, there was a 5% reduction in the odds of RTAC (P?=?0.03) Body mass index less than 30 decreased odds of RTAC by 61% (P?=?0.004).

Conclusion: RTACs were associated with body mass index greater than 30, decreased FIM-Motor subscore on admission, and paraplegia. Physiatrists caring for the non-traumatic SCI patient need be more circumspect of individuals with these parameters to potentially prevent the problems necessitating acute care transfer.     

Healthcare facility-onset,healthcare facility-associated Clostridioides difficile infection in Veterans with spinal cord injury and disorder

Abstract

Objective: To describe the burden and risk of healthcare facility-onset, healthcare facility-associated (HO-HCFA) Clostridioides difficile infection (CDI) in Veterans with spinal cord injury and disorder (SCI/D).

Design: Retrospective, longitudinal cohort study from October 1, 2001–September 30, 2010.

Setting: Ninety-four acute care Veterans Affairs facilities.

Participants: Patients with SCI/D.

Outcomes: Incidence rate of HO-HCFA CDI.

Methods: Rates of CDI were determined, and crude unadjusted incidence rate ratios (IRRs) and 95% confidence intervals (CIs) were calculated. Multivariable Poisson random-effects regression analyses were used to assess factors independently associated with the rate of CDI.

Results: 1,409 cases of HO-HCFA CDI were identified. CDI rates in 2002 were 13.9/10,000 person-days and decreased to 5.5/10,000 person-days by 2010. Multivariable regression analyses found that antibiotic (IRR?=?18.79, 95% CI 14.09-25.07) and proton-pump inhibitor (PPI) or H2 blocker use (IRR?=?7.71, 95% CI 5.47-10.86) were both independently associated with HO-HCFA CDI. Exposure to both medications demonstrated a synergistic risk (IRR?=?37.55, 95% CI 28.39-49.67). Older age, Northeast region, and invasive respiratory procedure in the prior 30 days were also independent risk factors, while longer SCI duration and care at a SCI center were protective.

Conclusion: Although decreasing, CDI rates in patients with SCI/D remain high. Targeted antimicrobial stewardship and pharmacy interventions that reduce antibiotic and PPI/H2 blocker use could have profound benefits in decreasing HO-HCFA CDI in this high-risk population.     

Reliability of S3 pressure sensation and voluntary hip adduction/toe flexion and agreement with deep anal pressure and voluntary anal contraction in classifying persons with traumatic spinal cord injury

Context/Objective: The sacral examination components of the International Standards for Neurological Classification of Spinal Cord Injury (ISNCSCI), namely deep anal pressure (DAP) and voluntary anal sphincter contraction (VAC), are often difficult to perform. We evaluated whether pressure sensation at the S3 dermatome (S3P), and voluntary hip adductor or toe flexor contraction (VHTC) are tenable alternatives. Here we report test–retest reliability and agreement of these components at 1 month after spinal cord injury (SCI), and impact of disagreement on American Spinal Injury Association (ASIA) Impairment Scale (AIS) grades.

Design: Longitudinal cohort. ISNCSCI examination, S3P and VHTC conducted at 1-month post-injury; retest of the sacral exam, S3P and VHTC within 3 days. Follow-up examinations performed at 3, 6, and 12 months.

Setting: Five Spinal Cord Injury Model System Centers.

Participants: Subjects with acute traumatic SCI, neurological levels T12 and above, AIS grades A–C.

Interventions: None.

Outcome Measures: ISNCSCI exam, AIS grades.

Results: Fifty-one subjects had 1-month data, and 39 had at least one follow-up examination. Test–retest reliability indicated perfect agreement (kappa?=?1.0) for all data except S3P (kappa?=?0.96). The agreement was almost perfect between S3P and DAP (kappa?=?0.84) and between VHTC and VAC (kappa?=?0.81). VHTC and VAC differed more often with neurologic levels below T10, possibly due to root escape in conus medullaris injuries.

Conclusion: S3P and VHTC show promise as alternatives to DAP and VAC for determining sacral sparing in persons with neurologic levels T10 and above. Reliability and agreement should be evaluated at earlier timepoints and in children with SCI.