Health outcomes and costs of acute traumatic spinal injury in New South Wales, Australia

Spine injuries among severely injured trauma patients: A retrospective single-center cohort study

BACKGROUNDS AND AIMS

We aimed to determine the incidence and severity of spine injuries among severely injured trauma patients (Injury Severity Score (ISS)/New Injury Severity Score (NISS) > 15) treated in a single tertiary trauma center over 15 years. We also wanted to compare the demographics between patients with and without spine injuries and to determine the mortality of spine-injury patients.

METHODS

Data from the years 2006-2020 from the Helsinki Trauma Registry (HTR), a local trauma registry of the trauma unit of the Helsinki University Hospital (HUH), were reviewed. We divided patients into two groups, namely those with traumatic spine injury (TSI) and those without traumatic spine injury (N-TSI). TSI patients were further subdivided into groups according to the level of injury (cervical, thoracolumbar, or multilevel) and the presence of neurological symptoms.

RESULTS

We included 2529 patients: 1336 (53%) had a TSI and 1193 (47%) had N-TSI. TSI patients were injured more frequently by a high-fall mechanism (37% vs 21%, p < 0.001). Among TSI patients, 38% of high-fall injuries were self-inflicted. High falls, young age, and female gender were overrepresented in spine-injury patients with a self-inflicted injury mechanism. Cervical spine-injury patients were mostly elderly persons injured by a low-energy mechanism.

CONCLUSIONS

Unlike other severely injured trauma patients, severely injured trauma patients with spine injuries are more frequently injured by a high-fall mechanism and self-injury.

Spinal cord injury in high-risk complex adult spinal deformity surgery: review of incidence and outcomes from the Scoli-RISK-1 study

STUDY DESIGN

Clinical case series.

OBJECTIVE

To describe the cause, treatment and outcome of 6 cases of perioperative spinal cord injury (SCI) in high-risk adult deformity surgery.

SETTING

Adult spinal deformity patients were enrolled in the multi-center Scoli-RISK-1 cohort study.

METHODS

A total of 272 patients who underwent complex adult deformity surgery were enrolled in the prospective, multi-center Scoli-RISK-1 cohort study. Clinical follow up data were available up to a maximum of 2 years after index surgery. Cases of perioperative SCI were identified and an extensive case review was performed.

RESULTS

Six individuals with SCI were identified from the Scoli-RISK-1 database (2.2%). Two cases occurred intraoperatively and four cases occurred postoperatively. The first case was an incomplete SCI due to a direct intraoperative insult and was treated postoperatively with Riluzole. The second SCI case was caused by a compression injury due to overcorrection of the deformity. Three cases of incomplete SCI occurred; one case of postoperative hematoma, one case of proximal junctional kyphosis (PJK) and one case of adjacent segment disc herniation. All cases of post-operative incomplete SCI were managed with revision decompression and resulted in excellent clinical recovery. One case of incomplete SCI resulted from infection and PJK. The patient's treatment was complicated by a delay in revision and the patient suffered persistent neurological deficits up to six weeks following the onset of SCI.

CONCLUSION

Despite the low incidence in high-risk adult deformity surgeries, perioperative SCI can result in devastating consequences. Thus, appropriate postoperative care, follow up and timely management of SCI are essential.

Traumatic spinal injury-related hospitalizations in the United States, 2016-2019: a retrospective study

BACKGROUND

Traumatic spinal injury (TSI) is associated with significant fatality and social burden; however, the epidemiology and treatment of patients with TSI in the US remain unclear.

MATERIALS AND METHODS

An adult population was selected from the National Inpatient Sample database from 2016 to 2019. TSI incidence was calculated and TSI-related hospitalizations were divided into operative and nonoperative groups according to the treatments received. TSIs were classified as fracture, dislocation, internal organ injury, nerve root injury, or sprain injuries based on their nature. The annual percentage change (APC) was calculated to identify trends. In-hospital deaths were utilized to evaluate the prognosis of different TSIs.

RESULTS

Overall, 95 047 adult patients were hospitalized with TSI in the US from 2016 to 2019, with an incidence rate of 48.4 per 100 000 persons in 2019 (95% CI: 46.2-50.6). The total incidence increased with an APC of 1.5% (95% CI: 0.1-3%) from 2016 to 2019. Operative TSI treatment was more common than nonoperative (32.8 vs. 3.8; 95% CI: 32.3-33.2 vs. 3.6-4%). The number of operations increased from 37 555 (95% CI: 34 674-40 436) to 40 460 (95% CI: 37 372-43 548); however, the operative rate only increased for internal organ injury (i.e. spinal cord injury [SCI])-related hospitalizations (APC, 3.6%; 95% CI: 2.8-4.4%). In-hospital mortality was highest among SCI-related hospitalizations, recorded at 3.9% (95% CI: 2.9-5%) and 28% (95% CI: 17.9-38.2%) in the operative and nonoperative groups, respectively.

CONCLUSIONS

The estimated incidence of TSI in US adults increased from 2016 to 2019. The number of operations increased; however, the proportion of operations performed on TSI-related hospitalizations did not significantly change. In 2019, SCI was the highest associated mortality TSI, regardless of operative or nonoperative treatment.

Factors associated with residential fire-related hospitalisations and deaths: A 10-year population-based study

This study aims to identify residential fire risk factors and their health outcomes in terms of hospital admissions from burns and smoke inhalation together with related readmissions, length of hospital stay (LOS), costs of hospitalisation and mortality within 30 days of the fire incidence. Residential fire-related hospitalisations from 2005 to 2014 in New South Wales, Australia were identified using linked data. Univariate and multivariable Poisson regression analyses were performed to determine factors associated with residential fires on hospital admission and loss of life. During the study period, 1862 individuals were hospitalised due to residential fires. In terms of prolonged LOS, high hospitalisation cost or mortality, fire incidents' that damaged both contents and structures of the property; were ignited by smokers' materials and/or due to mental or physical impairment of the residents had more adverse outcomes. Individuals aged 65 and over with comorbidities and/or acquired severe injuries from the fire incident were at a higher risk of long-term hospitalisation and death. This study provides information to response agencies in communicating fire safety messages and intervention programs to target vulnerable population. In addition, it also supplies indicators on hospital usage and LOS following residential fires to health administrators.

Thoracolumbar spine fracture patterns, etiologies, and treatment modalities in Jordan

Purpose

Spine fractures are a significant cause of long-term disability and socioeconomic burden. The incidence of spine fractures tends to increase with age, decreased bone density, and fall risk. In this study, we evaluated thoracolumbar fractures at a tertiary hospital in Jordan regarding their frequency, etiology, patterns, and treatment modalities.

Methods

The clinical and radiological records of 469 patients with thoracolumbar fracturesadmitted to King Hussein Medical City from July 2018 to August 2022 were evaluated regarding patients' age, sex, mechanism of injury, fracture level and pattern, and treatment modalities.

Results

The mean age of patients was 51.24±20.22 years, and men represented 52.7%. Compression injuries accounted for 97.2% of thoracolumbar fractures, and the thoracolumbar junction was the most common fracture location. Falling from the ground level was the most common mechanism and accounted for half of the injuries. Associated neurological injuries were identified in 3.8% of patients and were more common in younger patients. Pathological fractures were found in 12.4% and were more prevalent among elderly patients and women.

Conclusions

Traffic accidents and falling from height were the most common causes of spine fractures in patients younger than 40. However, 70% of spine fractures in women were caused by simple falls, reflecting the high prevalence of osteoporosis among women and the elderly. Therefore, traffic and work safety measures, as well as home safety measures and osteoporosis treatment for the elderly, should be recommended to reduce the risk of spine fractures.

Diagnostic Value of Magnetic Resonance Imaging Scan, Multislice Spiral Computed Tomography Three-Dimensional Reconstruction Combined with Plain Film X-Ray in Spinal Injuries

Objective

The main objective is to explore the diagnostic value of magnetic resonance imaging (MRI) scan, multislice spiral computed tomography (MSCT) three-dimensional reconstruction combined with plain film X-ray in spiral injuries.

Methods

By means of retrospective study, the data of 100 patients with spiral injury treated in our hospital from January 2020 to December 2021 were retrospectively analyzed, and all patients received MRI scan, MSCT three-dimensional reconstruction, and plain film X-ray examination, and by taking the operation results as the reference, the diagnostic results of different diagnostic modalities were analyzed, and the accordance rates (diagnostic result/surgical result × 100%) of the three diagnostic modalities and their combination were calculated, respectively.

Results

Among the 100 patients, 52 cases (52%) had a fracture at the anterior column of the spine, 28 cases (28%) had a fracture at the middle column of the spine, and 20 cases (20%) had a fracture at the posterior column of spine; 24 cases (24%) had simple flexion compression fracture, 60 cases (60%) had burst fracture, 6 cases (6%) had seat belt fracture, and 10 cases (10%) had fracture dislocation. The accordance rate of combined diagnosis for fracture site was 100%, and that for fracture type was 98.0%; MRI could visualize bone marrow injuries, ligamentous injuries, soft tissue injuries, and nerve root injuries that could not be visualized on X-ray plain films, and 3D reconstruction with MSCT could clearly demonstrate the 3D relationship of spinal fracture displacement, fracture line orientation, and spinal injury.

Conclusion

Plain film X-ray is the basic method for diagnosing spinal injuries, while MRI and MSCT have their unique advantages in this regard, and patients with a negative result of X-ray plain film can be examined by MRI and MSCT to observe the spinal injury comprehensively.

Predicting the 14-Day Hospital Readmission of Patients with Pneumonia Using Artificial Neural Networks (ANN)

Unplanned patient readmission (UPRA) is frequent and costly in healthcare settings. No indicators during hospitalization have been suggested to clinicians as useful for identifying patients at high risk of UPRA. This study aimed to create a prediction model for the early detection of 14-day UPRA of patients with pneumonia. We downloaded the data of patients with pneumonia as the primary disease (e.g., ICD-10:J12*-J18*) at three hospitals in Taiwan from 2016 to 2018. A total of 21,892 cases (1208 (6%) for UPRA) were collected. Two models, namely, artificial neural network (ANN) and convolutional neural network (CNN), were compared using the training (n = 15,324; ≅70%) and test (n = 6568; ≅30%) sets to verify the model accuracy. An app was developed for the prediction and classification of UPRA. We observed that (i) the 17 feature variables extracted in this study yielded a high area under the receiver operating characteristic curve of 0.75 using the ANN model and that (ii) the ANN exhibited better AUC (0.73) than the CNN (0.50), and (iii) a ready and available app for predicting UHA was developed. The app could help clinicians predict UPRA of patients with pneumonia at an early stage and enable them to formulate preparedness plans near or after patient discharge from hospitalization.

A Retrospective Pilot Study for Preoperative Screening to Prevent Iatrogenic Cervical Spinal Cord Injury

PURPOSE

The preoperative medical clearance process is well established to screen for medical comorbidities and therefore must be thorough. However, screening for potential cervical spine disease is often overlooked. In older surgical candidates, the presence of cervical spondylosis can increase risk of iatrogenic cervical spine injury during prolonged neck extension in non-spinal surgeries. We present a standard protocol for cervical spine clearance and a novel sustained neck extension maneuver through a retrospective case series.

METHODS

Sixty-three consecutive cases that underwent preoperative cervical clearance between April 2012 and December 2019 were reviewed. Referral for clearance occurred through the department of anesthesiology after concerning radiographic or physical exam findings were noted. A standard preoperative screening protocol with a sustained one-minute neck extension maneuver was implemented. Recommendations were made for standard neck precautions with or without neuromonitoring or for cervical spine decompression surgery prior to the planned procedure.

RESULTS

There were 25 patients with symptoms of myelopathy, 11 with radiculopathy and 13 with neck pain at baseline. Cervical spondylosis was observed in 51 patients, cervical canal stenosis in 29 and cervical myelomalacia in six. Fifty-seven patients underwent neck extension exam and 25 exhibited new or worsening symptoms. Myelopathic symptoms and radicular pain at baseline and positive Hoffman's and Spurling's sign, independently, were significantly associated with a positive neck extension exam (p<0.05). Fourteen patients were recommended for cervical decompression prior to planned procedure.

CONCLUSIONS

Our preoperative cervical spine clearance protocol is safe and may aid in identifying patients susceptible to iatrogenic cervical spine injury.

Incidence of Traumatic Spinal Fractures in the Netherlands: Analysis of a Nationwide Database

STUDY DESIGN

Retrospective database study based on prospectively collected data.

OBJECTIVE

The aim of this study was to describe the current incidence and epidemiology of traumatic spinal fractures in the Netherlands SUMMARY OF BACKGROUND DATA.: Traumatic spinal fractures may lead to severe disability and have considerable consequences on healthcare capacity and costs. Several studies have reported a large and increasing share of fractures in elderly. Currently, a reliable, detailed, and up to date incidence of these injuries in the Netherlands is lacking. These numbers could aid in the composition of preventative measures.

METHODS

All patients from 2010 to 2017 that were admitted with a spinal fracture were included. Patients were selected based on Abbreviated Injury Scores (AIS) codes. Collected data consisted of patient- and injury characteristics, afflicted spine-region, associated injury, referral- and discharge location, and geographic region of admittance.

RESULTS

Overall, 29,637 patients were included in this study. The incidence of spinal fractures increased from 2010 to 2017 (from 21.5 to 24.0 per 100,000 inhabitants). Most patients were injured by a (low-energy) fall from the same level followed by (high-energy) traffic accidents. Elderly patients (≥65 years of age) made up 42% of all patients. The proportion of elderly increased significantly faster over the years compared to younger patients. More than half of polytrauma (injury severity score ≥16) patients had fractures in multiple spine regions. 5,5% of all patients suffered spinal cord injury (SCI), most often associated with cervical fractures in polytrauma patients. Regional differences were found mainly in presentation through referral and low- and high-energy falls.

CONCLUSION

The incidence of patients with spinal fractures increased and elderly made up a large part. Preventative measures could be regional dependent and should focus on low-energy falls, traffic accidents, and bicycle accidents in specific. In polytraumatized patients there should be special attention for any additional spine fractures and SCI.

LEVEL OF EVIDENCE

3.

Factors Associated With In-Hospital Outcomes of Traumatic Spinal Cord Injury: 10-year Analysis of the US National Inpatient Sample

INTRODUCTION

Traumatic spinal cord injury (SCI) is a life-altering event. Motor vehicle accidents and falls are common causes of traumatic SCI, and SCI outcomes may be affected by patients' ages and injury sites. This study aimed to investigate the factors associated with unfavorable in-hospital outcomes, focusing on the impact of patients' ages and SCI lesion sites.

METHODS

Data of 25,988 patients hospitalized with traumatic SCI in the US National Inpatient Sample (NIS) database from 2005 to 2014 were extracted and analyzed. Univariate and multivariate logistic regression analyses were performed to determine the factors associated with SCI outcomes, including in-hospital deaths, adverse discharge, and prolonged hospital stays.

RESULTS

Multivariate analysis revealed that the oldest ages (>65 years) were significantly associated with increased in-hospital mortality compared with the youngest ages at all lesion sites (cervical, odds ratio [OR]: 5.474, 95% confidence interval [CI]: 4.465 to 6.709; thoracic, OR: 5.940, 95% CI: 3.881 to 9.091; and lumbosacral, OR: 6.254, 95% CI: 2.920 to 13.394). Older ages were also significantly associated with increased adverse outcomes at all sites (cervical, OR: 2.460, 95% CI: 2.180 to 2.777; thoracic, OR: 2.347, 95% CI: 1.900 to 2.900; and lumbosacral, OR: 2.743, 95% CI: 2.133 to 3.527). Intermediate ages (35 to 64) were also significantly associated with increased in-hospital death and adverse discharge at cervical and thoracic SCIs, but not at lumbosacral sites.

DISCUSSION

For hospitalized patients with traumatic SCI, older age independently predicts worse in-hospital outcomes, with greatest effects seen in patients aged 65 years and older. Study findings suggest that extra vigilance and targeted management strategies are warranted in managing SCI patients aged 65 years and older during hospitalization.

What Is the Impact of Engaging With Natural Environments Delivered Via Virtual Reality on the Psycho-emotional Health of People With Spinal Cord Injury Receiving Rehabilitation in Hospital? Findings From a Pilot Randomized Controlled Trial

OBJECTIVES

This study investigated (1) the effect of engaging with 20-minute simulated natural environments delivered via virtual reality (VR) on current mood state and (2) the effect of engaging with multiple VR sessions over a period of a week on the depressive symptoms of people with a spinal cord injury (SCI).

DESIGN

Randomized controlled trial design.

SETTING

Spinal Cord Injury Rehabilitation Unit in Australia.

PARTICIPANTS

Participants (N=24) were assigned to a group engaging in VR sessions during week 1 (group 1, n=10) or week 2 (group 2, n=14).

INTERVENTIONS

The intervention week involved participation in up to three 20-minute VR sessions over 3 consecutive days. The control condition involved regular rehabilitation practice over a week.

MAIN OUTCOME MEASURES

The Patient Health Questionnaire-8 (PHQ-8) was completed prior to the first week (T1), after the first week and prior to the second week (T2), and after the second week (T3). Current feeling states, including depressed/happy, anxious/relaxed, and not feeling good/feeling good, were rated immediately prior and after each VR session.

RESULTS

Levels of happiness, relaxation, and feeling good were significantly higher subsequent to engaging with each VR session. Between-group differences in PHQ-8 scores were significantly greater for participants who experienced the intervention during the first week compared to participants within the control group: intervention participants had significant improvements in psycho-emotional health. Within-group PHQ-8 scores were reduced for each group subsequent to experiencing the intervention; however, differences were not significant.

CONCLUSIONS

Engaging with simulated natural environments delivered via VR can favorably affect the psycho-emotional health of people with SCI receiving rehabilitation in hospital. Future research including larger samples and investigating the effect over a longer time period is required to confirm the findings presented.

Trends of traumatic spinal injury-related hospitalizations in Australian children over a 10-year period: a nationwide population-based cohort study

BACKGROUND CONTEXT

Despite its potential to cause serious and life-long disability or death, population-based data on traumatic spinal injury in pediatric populations is scarce.

PURPOSE

To quantify and describe the incidence and cost of hospitalizations for traumatic spinal injury among Australian children, and to examine the trend over a 10-year period.

STUDY DESIGN

Population-based retrospective cohort study.

PATIENT SAMPLE

Children aged ≤16 years who were hospitalized for traumatic spinal injury in Australia during 1 July 2002 to 30 June 2012.

OUTCOME MEASURES

Age-standardized hospital admission rates.

METHODS

This study used linked hospitalization and mortality data. Age-standardized hospitalization rates were calculated with 95% confidence intervals (CIs). Negative binomial regression was used to examine change in temporal trends in hospitalization rates.

RESULTS

There were 4,360 hospitalizations for pediatric traumatic spinal injury during the 10-year study period. Males and older children were more frequently hospitalized, and falls and road trauma accounted for almost three-quarters of hospitalizations. The average overall annual hospitalization rate was 9.43 (95% CI: 9.15-9.72) per 100,000 population, with an annual percent change of 1.2% (95% CI: -0.1% to 2.4%). There was an increase in the annual hospitalization rate for spinal dislocations, sprains, and strains (3.0% [95% CI: 0.8%-5.3%]) and among female children (1.7% [95% CI: 0.0%-3.4%]). The estimated total hospital treatment costs were AUD$43 million over the 10-year study period, with an estimated mean cost per child of AUD$9,867.

CONCLUSIONS

Pediatric traumatic spinal injury is associated with significant morbidity and mortality. The burden of hospitalized pediatric traumatic spinal injury in Australia is rising, in particular spinal dislocations, sprains, and strains among female children. Targeted prevention strategies are needed to reduce the burden of pediatric traumatic spinal injury. It is recommended that a coordinated national strategy for preventing childhood traumatic spinal injury is developed and implemented in Australia.

Acute Adverse Events After Spinal Cord Injury and Their Relationship to Long-term Neurologic and Functional Outcomes: Analysis From the North American Clinical Trials Network for Spinal Cord Injury

OBJECTIVES

There are few contemporary, prospective multicenter series on the spectrum of acute adverse events and their relationship to long-term outcomes after traumatic spinal cord injury. The goal of this study is to assess the prevalence of adverse events after traumatic spinal cord injury and to evaluate the effects on long-term clinical outcome.

DESIGN

Multicenter prospective registry.

SETTING

Consortium of 11 university-affiliated medical centers in the North American Clinical Trials Network.

PATIENTS

Eight-hundred one spinal cord injury patients enrolled by participating centers.

INTERVENTIONS

Appropriate spinal cord injury treatment at individual centers.

MEASUREMENTS AND MAIN RESULTS

A total of 2,303 adverse events were recorded for 502 patients (63%). Penalized maximum logistic regression models were fitted to estimate the likelihood of neurologic recovery (ASIA Impairment Scale improvement ≥ 1 grade point) and functional outcomes in subjects who developed adverse events at 6 months postinjury. After accounting for potential confounders, the group that developed adverse events showed less neurologic recovery (odds ratio, 0.55; 95% CI, 0.32-0.96) and was more likely to require assisted breathing (odds ratio, 6.55; 95% CI, 1.17-36.67); dependent ambulation (odds ratio, 7.38; 95% CI, 4.35-13.06) and have impaired bladder (odds ratio, 9.63; 95% CI, 5.19-17.87) or bowel function (odds ratio, 7.86; 95% CI, 4.31-14.32) measured using the Spinal Cord Independence Measure subscores.

CONCLUSIONS

Results from this contemporary series demonstrate that acute adverse events are common and are associated with worsened long-term outcomes after traumatic spinal cord injury.

Identifying Predictors of Higher Acute Care Costs for Patients With Traumatic Spinal Cord Injury and Modeling Acute Care Pathway Redesign: A Record Linkage Study

STUDY DESIGN

Record linkage study using healthcare utilization and costs data.

OBJECTIVE

To identify predictors of higher acute-care treatment costs and length of stay for patients with traumatic spinal cord injury (TSCI).

SUMMARY OF BACKGROUND DATA

There are few current or population-based estimates of acute hospitalization costs, length of stay, and other outcomes for people with TSCI, on which to base future planning for specialist SCI health care services.

METHODS

Record linkage study using healthcare utilization and costs data; all patients aged more than or equal to 16 years with incident TSCI in the Australian state of New South Wales (June 2013-June 2016). Generalized Linear Model regression to identify predictors of higher acute care treatment costs for patients with TSCI. Scenario analysis quantified the proportionate cost impacts of patient pathway modification.

RESULTS

Five hundred thirty-four incident cases of TSCI (74% male). Total cost of all acute index episodes approximately AUD$40.5 (95% confidence interval [CI] ±4.5) million; median cost per patient was AUD$45,473 (Interquartile Range: $15,535-$94,612). Patient pathways varied; acute care was less costly for patients admitted directly to a specialist spinal cord injury unit (SCIU) compared with indirect transfer within 24 hours. Over half (53%) of all patients experienced at least one complication during acute admission; their care was less costly if they had been admitted directly to SCIU. Scenario analysis demonstrated that a reduction of indirect transfers to SCIU by 10% yielded overall cost savings of AUD$3.1 million; an average per patient saving of AUD$5,861.

CONCLUSION

Direct transfer to SCIU for patients with acute TSCI resulted in lower treatment costs, shorter length of stay, and less costly complications. Modeling showed that optimizing patient-care pathways can result in significant acute-care cost savings. Reducing potentially preventable complications would further reduce costs and improve longer-term patient outcomes.

LEVEL OF EVIDENCE

3.

Understanding and modelling the economic impact of spinal cord injuries in the United Kingdom

STUDY DESIGN

Economic modelling analysis.

OBJECTIVES

To determine lifetime direct and indirect costs from initial hospitalisation of all expected new traumatic and non-traumatic spinal cord injuries (SCI) over 12 months.

SETTING

United Kingdom (UK).

METHODS

Incidence-based approach to assessing costs from a societal perspective, including immediate and ongoing health, rehabilitation and long-term care directly attributable to SCI, as well as aids and adaptations, unpaid informal care and participation in employment. The model accounts for differences in injury severity, gender, age at onset and life expectancy.

RESULTS

Lifetime costs for an expected 1270 new cases of SCI per annum conservatively estimated as £1.43 billion (2016 prices). This equates to a mean £1.12 million (median £0.72 million) per SCI case, ranging from £0.47 million (median £0.40 million) for an AIS grade D injury to £1.87 million (median £1.95 million) for tetraplegia AIS A-C grade injuries. Seventy-one percent of lifetime costs potentially are paid by the public purse with remaining costs due to reduced employment and carer time.

CONCLUSIONS

Despite the magnitude of costs, and being comparable with international estimates, this first analysis of SCI costs in the UK is likely to be conservative. Findings are particularly sensitive to the level and costs of long-term home and residential care. The analysis demonstrates how modelling can be used to highlight economic impacts of SCI rapidly to policymakers, illustrate how changes in future patterns of injury influence costs and help inform future economic evaluations of actions to prevent and/or reduce the impact of SCIs.

Effects of ginsenoside Rb1 on oxidative stress injury in rat spinal cords by regulating the eNOS/Nrf2/HO-1 signaling pathway

The present study aimed to investigate whether ginsenoside Rb1 (G-Rb1) attenuates spinal cord injury-associated oxidative stress in rats by regulating the endothelial nitric oxide synthase eNOS/nuclear factor erythroid 2-related factor 2 (Nrf2)/heme oxygenase (HO)-1 signaling pathway. Sprague Dawley rats were randomly divided into the sham operation group (S group), spinal cord injury group (SCI group), G-Rb1 treatment group (G-Rb1 group) and SCI+G-Rb1+Inhibitor L-name group (L-name group). The posterior limb function was evaluated via the Basso, Beattie and Bresnahan scoring method. The levels of superoxide dismutase (SOD), malondialdehyde (MDA), catalase (CAT) and glutathione (GSH) in serum were measured by ELISA. The pathological changes in the spinal cord were observed by H&E staining. Reverse transcription-quantitative polymerase chain reaction and western blot analyses were used to detect eNOS, phosphorylated (p)-eNOS, heat shock protein (HSP)90, Nrf2 and NAD(P)H quinone dehydrogenase 1 (Nqo1) at the mRNA and protein level. Immunohistochemistry was used to detect the expression of Nrf2 and p-eNOS. Compared with the S group, the scores of spinal cord function in the SCI group were significantly lower, and the levels of MDA were significantly increased, while the levels of SOD, CAT and GSH protein in spinal cord were significantly decreased (P<0.05). The spinal cord tissue exhibited hemorrhage, neuronal degeneration/necrosis, as well as mononuclear cell and lymphocyte infiltration. The eNOS, HSP90, Nrf2, Nqo1 and HO-1 mRNA levels were decreased (P<0.05). Compared with those in the SCI group, the spinal cord function score in the G-Rb1 group were significantly higher and the serum MDA content was significantly decreased, while the activity of SOD, CAT and GSH was significantly increased (P<0.05). The degeneration/necrosis of spinal cord neurons was attenuated, inflammatory cell infiltration was significantly reduced and the levels of eNOS, HSP90, Nrf2, Nqo1 and HO-1 were significantly upregulated (P<0.05). In the group that was administered the eNOS inhibitor L-name, the levels of eNOS, HSP90, Nrf2, Nqo1 and HO-1 were significantly decreased. In conclusion, G-Rb1 attenuates oxidative stress in injured spinal cords. The mechanism may at least in part involve the eNOS/Nrf2/HO-1 pathway.