Alcohol consumption, blood alcohol concentration level and guideline compliance in hospital referred patients with minimal, mild and moderate head injuries

Background

In 2000 the Scandinavian Neurotrauma Committee published guidelines for safe and cost-effective management of minimal, mild and moderate head injured patients.

The aims of this study were to investigate to what extent the head injury population is under the influence of alcohol, and to evaluate whether the physicians' compliance to the guidelines is affected when patients are influenced by alcohol.

Methods

This study included adult patients (≥15 years) referred to a Norwegian University Hospital with minimal, mild and moderate head injuries classified according to the Head Injury Severity Scale (HISS). Information on alcohol consumption was recorded, and in most of these patients blood alcohol concentration (BAC) was measured. Compliance with the abovementioned guidelines was registered.

Results

The study includes 860 patients. 35.8% of the patients had consumed alcohol, and 92.1% of these patients had a BAC ≥ 1.00‰. Young age, male gender, trauma occurring during the weekends, mild and moderate head injuries were independent factors significantly associated with being under the influence of alcohol. Guideline compliance was 60.5%, and over-triage was the main violation. The guideline compliance showed no significant correlation to alcohol consumption or to BAC-level.

Conclusions

This study confirms that alcohol consumption is common among patients with head injuries. The physicians' guideline compliance was not affected by the patients' alcohol consumption, and alcohol influence could therefore not explain the low guideline compliance.

Would loss to follow-up bias the outcome evaluation of patients operated for degenerative disorders of the lumbar spine?

BACKGROUND AND PURPOSE

Loss to follow-up may bias the outcome assessments of clinical registries. In this study, we wanted to determine whether outcomes were different in responding and non-responding patients who were included in a clinical spine surgery registry, at two years of follow-up. In addition, we wanted to identify risk factors for failure to respond.

METHODS

633 patients who were operated for degenerative disorders of the lumbar spine were followed for 2 years using a local clinical spine registry. Those who did not attend the clinic and those who did not answer a postal questionnaire-for whom 2 years of outcome data were missing-and who would be lost to follow-up according to the standard procedures of the registry protocols, were defined as non-respondents. They were traced and interviewed by telephone. Outcome measures were: improvement in health-related quality of life (EQ-5D), leg pain, and back pain; and also general state of health, employment status, and perceived benefits of the operation.

RESULTS

We found no statistically significant differences in outcome between respondents (78% of the patients) and non-respondents (22%). Receipt of postal questionnaires (not being summoned for a follow-up visit) was the strongest risk factor for failure to respond. Forgetfulness appeared to be an important cause. Older patients and those who had complications were more likely to respond.

INTERPRETATION

A loss to follow-up of 22% would not bias conclusions about overall treatment effects and, importantly, there were no indications of worse outcomes in non-respondents.

Incidence of aneurysmal subarachnoid hemorrhage in Norway, 1999-2007

OBJECTIVE

To investigate changes and regional variations in annual incidence rates of aneurysmal subarachnoid hemorrhage (SAH) in Norway between 1999 and 2007.

METHODS

The authors retrospectively reviewed data from the Norwegian Patient Register for the period 1999-2007.

RESULTS

Crude incidence of aneurysmal SAH was 10.0/100,000 person years [95% CI (confidence interval): 9.7-10.3] and was higher in women (12.0/100,000 person years; 95% CI: 11.5-12.5) than men (8.1/100,000 person years; 95% CI: 7.7-8.4). Decreasing annual incidence rates were observed from 11.1/100,000 person years (95% CI: 10.5-11.6) in the period 1999-2001 to 8.9/100,000 person years (95% CI: 8.4-9.4) in the period 2005-2007 (P for trend <0.001). Regional variations were observed, from 8.4/100,000 person years (95% CI: 7.7-9.00) in the southern region, 10.4/100,000 person years (95% CI: 9.5-11.2) in the central region and 11.9/100,000 person years (95% CI: 10.8-12.9) in the northern region.

CONCLUSIONS

Incidence of aneurysmal SAH in Norway decreased from 1999 to 2007, with significant regional variations indicating an increasing gradient from south to north.

Chronic mucus hypersecretion: prevalence and risk factors in younger individuals

SETTING

Chronic mucus hypersecretion (CMH) is a common condition in patients with chronic respiratory diseases. Little is known about the incidence, prevalence and determinants of CMH in younger individuals.

OBJECTIVE

To determine prevalence, incidence and risk factors for CMH in a young general population.

DESIGN

A cohort of Danish twins (aged 12-41 years) was prospectively examined using questionnaires in 1994 (n = 29 180) and in 2002 (n = 21 130). Prevalence and incidence of CMH were determined, and risk factors for the condition were assessed using logistic regression.

RESULTS

Lifetime prevalence of CMH was 8.6% in females and 6.9% in males in 1994, and the cumulative incidence among females and males was respectively 10.7% and 8.7% during the study period. Smoking and asthma were risk factors for CMH, with a dose-response effect of tobacco consumption, and smoking habits also predicting incidence of CMH.

CONCLUSION

Among the young, CMH is a condition related to asthma and smoking, with a dose-response relationship with tobacco consumption and a relation between smoking habits and incidence. Female susceptibility to development of CMH was observed, as well as signs of greater susceptibility related to young age.

Altered brain myelin sheath morphology after rewarming in situ

In this study cerebral ultrastructure was examined in an in vivo rat model, after rewarming from profound hypothermia (15-13 degrees C). Animals held at 37 degrees C served as controls. After rewarming, brains were examined by electron microscope. Micrographs were taken randomly, analyzed anonymously, and quantified by morphometry. Serum analysis of the stress marker S-100beta was carried out in identical groups. The most striking findings in rewarmed animals, when compared to controls, were alterations of myelin sheaths (p<.008) and elevated S-100beta (p<.0001). This indicates that cells in the central nervous system are susceptible to injury in an experimental model of accidental hypothermia and rewarming.

No impact of early intervention on late outcome after minimal, mild and moderate head injury

Objectives

To evaluate the effect of an educational intervention on outcome after minimal, mild and moderate head injury.

Methods

Three hundred and twenty six patients underwent stratified randomization to an intervention group (n = 163) or a control group (n = 163). Every second patient was allocated to the intervention group. Participants in this group were offered a cognitive oriented consultation two weeks after the injury, while subjects allocated to the control group were not. Both groups were invited to follow up 3 and 12 months after injury.

Results

A total of 50 (15%) patients completed the study (intervention group n = 22 (13%), control group n = 28 (17%), not significant). There were no statistically significant differences between the intervention group and the control group.

Conclusions

There was no effect on outcomes from an early educational intervention two weeks after head injury.

Organisation of traumatic head injury management in the Nordic countries

OBJECTIVE

The aim of this study is to map and evaluate the available resources and the premises of traumatic head injury management in the Nordic countries, before the implementation of a Nordic adaption of the Brain Trauma Foundation guidelines for prehospital management.

METHODS

The study is a synthesis of two cross-sectional surveys. Questionnaires were used to collect data on the annual number of acute head injury operations, the infrastructure, the level of education, the use of trauma protocols and the management of traumatic head injury at Nordic hospitals.

RESULTS

The proportion of acute head injury operations performed outside a neurosurgical department was 0% in Denmark, 16% in Finland, 19% in Norway and 33% in Sweden. Eighty-four per cent of Nordic hospitals had written protocols for the assessment and treatment of trauma patients and 78% had regular training in trauma management; 67% had specific protocols for the treatment of traumatic head injury. Computed tomography (CT) was available in 93% of the hospitals, and 59% of the hospitals could link CT scans to the regional neurosurgical department.

CONCLUSIONS

Most Nordic hospitals are well prepared to manage patients with acute traumatic head injury. A substantial proportion of the operations are performed at local and central hospitals without neurosurgical expertise, despite an efficient pre and interhospital transport system. The Nordic adaption of the Brain Trauma Foundation guidelines recommends that this practice is terminated.

Four-year follow-up of surgical versus non-surgical therapy for chronic low back pain

Objectives

To compare the long-term effectiveness of surgical and non-surgical treatment in patients with chronic low back pain.

Methods

Two merged randomised clinical trials compared instrumented transpedicular fusion with cognitive intervention and exercises in 124 patients with disc degeneration and at least 1 year of symptoms after or without previous surgery for disc herniation. The main outcome measure was the Oswestry disability index.

Results

At 4 years 14 (24%) patients randomly assigned to cognitive intervention and exercises had also undergone surgery. 15 (23%) patients assigned fusion had undergone re-surgery. The mean treatment effect for the primary outcome was 1.1; 95% CI −5.9 to 8.2, according to the intention-to-treat analysis and −1.6; 95% CI −8.9 to 5.6 in the as-treated analysis. There was no difference in return to work.

Conclusions

Long-term improvement was not better after instrumented transpedicular fusion compared with cognitive intervention and exercises.

Prediction of time trends in recovery of cognitive function after mild head injury

OBJECTIVE

To investigate relations between predictors and outcomes, and especially to identify predictors influencing the time trend in recovery after mild traumatic brain injury.

METHODS

We included 59 patients with mild head injury in a prospective study. They underwent comprehensive assessment with neurological and neuroradiological examinations, serum S-100B analysis, and apolipoprotein E (APOE) genotyping. Neuropsychological testing was performed before and 6 months after discharge. Linear mixed models were used to assess associations between baseline predictors and neurocognitive performance and its change.

RESULTS

A Glasgow Coma Scale score of less than 15, traumatic brain injury demonstrated with computed tomography, magnetic resonance imaging, and serum S-100B greater than 0.14 microg/L predicted impaired cognitive performance both at baseline and after 6 months; APOE genotype did not. There was significant improvement of performance after 6 months. APOE-epsilon4 genotype was the only independent factor significantly predicting less improvement.

CONCLUSION

The presence of the APOE-epsilon4 allele predicts less recovery of cognitive function after mild head injury.

Introduction of endovascular embolization for intracranial aneurysms in a low-volume institution

BACKGROUND

Studies indicate a relationship between hospital caseload and health outcomes after both surgical and endovascular repair of intracranial aneurysms.

PURPOSE

To evaluate outcomes after introduction of endovascular embolization for intracranial aneurysms in a low-volume regional university hospital.

MATERIAL AND METHODS

Retrospective study of 243 consecutive patients treated for 284 intracranial aneurysms with endovascular embolization or surgical clipping from 2000 to 2006 at the University Hospital of North Norway. Postoperative complications were registered. The Glasgow Outcome Scale (GOS) was used for assessment of outcome.

RESULTS

The mean annual number of procedures was 39 (microsurgery 23, embolization 16). Seventy-four percent of patients with ruptured aneurysms and all patients with unruptured aneurysms had a favorable outcome (GOS 4 or 5) at 1 year follow-up. Patients with subarachnoid hemorrhage were more likely to experience postoperative complications than patients treated for unruptured aneurysms (42% versus 8% of the patients, P<0.01). The immediate incomplete occlusion rate (Raymond II-III) in the initial embolization procedure was 29%. Ten endovascularly treated patients and one surgically treated patient required retreatments due to residual aneurysm or neck remnants.

CONCLUSION

The present study indicates that acceptable outcome from aneurysm treatment, both endovascular and microsurgical, is possible in a low-volume institution.

[Brain injury marker S100B can reduce the use of computer tomography in minor head injuries--secondary publication]

The risk of acute intracranial complications after minor head injury (MHI) is low. Despite this, computed tomography (CT) is generally recommended with clinical observation as a secondary option. Both options have disadvantages. Clinical studies have shown the potential advantages of using the biomarker S100B. The specificity of S100B is low, but a high sensitivity for brain damage results in a clinically useful, high negative predictive value (NPV). Integration of S100B into existing management routines can reduce the need for CT scans or admission by over 30%.

Incidence of hospital referred head injuries in Norway: a population based survey from the Stavanger region

Background

In three previous Norwegian studies conducted between 1974 and 1993, the annual incidence rates of hospital admitted head injuries were 236, 200 and 169 per 100,000 population. The aim of this study was to describe the incidence of head injury in the Stavanger region and to compare it with previous Norwegian studies.

Methods

All head injured patients referred to Stavanger University Hospital during a one-year period (2003) were registered in a partly prospective and partly retrospective study. The catchment area for the hospital is strictly defined to a local population of 283,317 inhabitants (2003).

Results

The annual incidence rate was 207/100,000 population for hospital referred head injury and 157/100,000 population for hospital admitted head injury. High age- and sex specific incidence rates were observed among the oldest, and the highest rate (882/100,000) among men above 90 years. More than 50% of the injuries were caused by falls.

Conclusion

Comparison with previous Norwegian studies indicates decreasing annual incidence rates for hospital admitted head injury during the last 30 years.

Determination of Wall Tension in Cerebral Artery Aneurysms by Numerical Simulation

Background and Purpose— Cerebral artery aneurysms rupture when wall tension exceeds the strength of the wall tissue. At present, risk-assessment of unruptured aneurysms does not include evaluation of the lesions shape, yet clinical experience suggests that this is of importance. We aimed to develop a computational model for simulation of fluid-structure interaction in cerebral aneurysms based on patient specific lesion geometry, with special emphasis on wall tension.

Methods— An advanced isogeometric fluid-structure analysis model incorporating flexible aneurysm wall based on patient specific computed tomography angiogram images was developed. Variables used in the simulation model were retrieved from a literature review.

Results— The simulation results exposed areas of high wall tension and wall displacement located where aneurysms usually rupture.

Conclusion— We suggest that analyzing wall tension and wall displacement in cerebral aneurysms by numeric simulation could be developed into a novel method for individualized prediction of rupture risk.

Prioritisation of telemedicine services for large scale implementation in Norway

In late 2005, the Northern Norway Regional Health Authority requested an evaluation of all tested telemedicine services in northern Norway to clarify which were suitable for large scale implementation. A total of 282 reports from the Norwegian Centre for Telemedicine, the University Hospital of North Norway and the University of Tromsø were included in the study. Projects not focusing on secondary health care were excluded and 46 studies representing 21 topics entered the final analysis. They were analysed with a self-developed scoring tool focusing on five items. Eleven topics were concluded as being candidates for large scale implementation and grouped according to priority. The first priority topics were teleradiology, digital communication/integration of patient records and education. The second priority topics were teledialysis, pre-hospital thrombolysis, telepsychiatry and teledermatology. The third priority topics were paediatrics, district medical centres, tele-ophthalmology and tele-otorhinolaryngology. No priority was suggested for the projects in cardiology, endocrinology, geriatrics, gynaecology/obstetrics, pathology and nursing/care. User support, training, research ability, financial incentives and interaction between clinicians and ICT-personnel were considered as important factors in motivating health-care personnel to use telemedicine.

Clinical significance of serum S100B levels in neurointensive care

OBJECTIVE

S100B is viewed as the most promising biomarker for brain damage. It has been proposed that this marker is useful in a Neurointensive Care Unit (NICU) as a monitoring parameter. This study aims to examine the clinical usefulness of daily serum S100B measurements in this setting.

DESIGN

Prospective consecutive inclusion of patients.

PATIENTS

A total of 79 patients with confirmed or suspected head injury or cerebrovascular insults (CVIs) (based upon patient history, computed tomography (CT) and/or magnetic resonance imaging (MRI) and neurological examination including coma scoring) who required neurointensive care were included in the study.

INTERVENTIONS

Sampling for S100B was performed at admission and daily until patients were discharged from the NICU. S100B measurements were statistically compared to occurrence of secondary complications and outcome according to Glasgow Outcome Scale (GOS), with focus on clinical prediction.

MEASUREMENTS AND MAIN RESULTS

17 of 79 patients (22%) had secondary neurological complications. Mean S100B levels were found to be an independent parameter associated with these complications (P=0.03). Mean S100B levels were higher in patients with complications compared to those without on both the complication day (P=0.033) and the day after (P=0.015), but not the day prior to the complication (P=0.62). S100B did not predict secondary neurological complication. Neither mean (P=0.182) nor peak (P=0.370) S100B levels were associated with or predicted outcome according to dichotomised GOS.

CONCLUSION

Daily S100B measurements are associated with secondary complications but not to outcome. However, daily S100B levels do not predict secondary complications, which limit the usefulness of this brain biomarker in this setting.

Computation of hemodynamics in the circle of Willis

BACKGROUND AND PURPOSE

Wall shear stress (WSS) and pressure are important factors in the development of cerebral aneurysms. We aimed to develop a computational fluid dynamics simulator for flow in the complete circle of Willis to study the impact of variations in vessel radii and bifurcation angles on WSS and pressure on vessel walls.

METHODS

Blood flow was modeled with Navier-Stokes equations as an incompressible newtonian fluid within rigid vessel walls. A model of the circle of Willis geometry was approximated as a network of tubes around cubic curves. Pulsatile inlet flow rates and constant outlet pressure were used as boundary conditions.

RESULTS

The simulations confirmed that differences in vessel radii and asymmetric branch angles influence WSS magnitude and spatial distribution. High WSS occurred at locations where aneurysms are frequent and in anatomic variants known to be associated with an increased risk for aneurysm development.

CONCLUSIONS

Computational fluid dynamics analysis can be applied to the complete circle of Willis and should be used to study the pathophysiology of this complex vascular structure, including risk factors for aneurysm development. Further development of the method should include simulations with flexible vessel walls.

S100B serum level predicts computed tomography findings after minor head injury

BACKGROUND

Mild head injury (MHI) implies a risk for traumatic brain injury and even a small risk for development of an intracranial hematoma. Head computed tomography (CT) is recommended for early detection of such pathologic findings. The present multicenter study was performed to investigate whether determination of protein S100B in serum could contribute to the selection of patients for CT scanning.

METHODS

We included 226 patients with a history of head injury and a Glasgow Coma Scale (GCS) score of 13 to 15 at admission to hospital. Blood samples for S100B analysis and head CT were obtained within 12 hours after the injury. The diagnostic properties of S100B measurements for prediction of intracranial injury revealed by CT were tested with receiver operating characteristic (ROC) analysis and cross-table analysis at different cut-off levels. We also included analysis of S100B levels normalized to correspond to blood sampling 1 hour after the injury.

RESULTS

CT showed intracranial injury in 21 (9.3%) patients. S100B levels were significantly (p < 0.001) elevated in patients with intracranial injury (mean, 0.36; 95% CI, 0.21-0.50 microg/L) compared with those in patients without intracranial injury (mean, 0.18; 95% CI, 0.16-0.20 microg/L). ROC curve analysis showed a significant (p = 0.001) area under the curve (0.73; 95% CI, 0.62-0.84). Cross-table analysis showed that 20 of 21 (sensitivity 0.95) patients with intracranial injury were detected at a cut-off level of 0.10 microg/L, but 141 of 205 (specificity 0.31) patients with no such injury also had a S100B level above this limit. Exclusion of cases with blood samples collected more than 3 hours after injury or normalization did not improve the diagnostic properties.

CONCLUSION

Determination of serum S100B cannot replace the clinical examination or use of CT for patients with minor head injury, but adding S100B measurement to the clinical evaluation might support selection of patients for CT scanning.

Five-year outcome after mild head injury: a prospective controlled study

OBJECTIVES

To study the prevalence of post-concussion symptoms (PCS) 5-7 years after mild head injury (MHI) and to investigate whether patients suffer from more symptoms than the normal population.

METHODS

We conducted a 5- to 7-year follow-up of patients (n = 89) with MHI. Post-concussion symptoms were quantified with the Rivermead Post Concussion Symptoms Questionnaire (RPQ) and health-related quality of life (HRQL) was measured with the EuroQol-5D (EQ-5D). We also quantified subjective general health state with the EuroQol Visual Analogue Scale (EQ-VAS). An age- and sex-matched, but otherwise randomly chosen control group of 89 persons was recruited from the National Population Registry for a cross-sectional comparison. Twenty-eight patients (30%) and 27 (30%) controls responded.

RESULTS

Patients reported significantly (P = 0.017) more PCS (median RPQ score 10, 95% CI 2-20) than controls (median 2, 95% CI 0-4). They also reported significantly (P = 0.008) lower HRQL (median EQ-5D score 0.866, 95% CI 0.796-1.000) than controls (1.000, 95% CI 1.000-1.000), but there was no difference between the groups in their subjective ratings of general health state.

CONCLUSIONS

Patients reported significantly more PCS and lower HRQL 5 to 7 years after MHI than age- and sex-matched controls from the normal population.

[Spontaneous intracerebral hemorrhage]

BACKGROUND

Cerebral stroke caused by intracerebral hemorrhage is serious. This review presents updated knowledge about the condition.

MATERIAL AND METHODS

The review is based on pivotal articles published during recent years, identified through a PubMed search applying the key words "intracerebral haemorrhage", and our own clinical experience.

RESULTS AND INTERPRETATION

Intracerebral hemorrhage strikes about 1,000 persons in Norway annually. Hypertension is the single most important risk factor. Cerebral CT confirms the diagnosis. Almost half of the patients die during the first month after the hemorrhage, many during the first two days. About 20% of the patients can manage without help after the first six months. Treatment includes measures against increased intracranial pressure and in selected cases surgical evacuation of the haematoma, especially in cases of bleeding into the cerebellum. Recombinant factor VIIa infused within the first three hours to stop the bleeding can play an important role in the acute phase. Patients below the age of 45, patients without hypertension, and patients with lobar haemorrhage and signs of clinical deterioration should be thoroughly investigated to disclose a potential arteriovenous malformation or an aneurysm. Neurointensive care may give better clinical results and the condition should ideally be treated in an intensive care unit.

Head injury outcome prediction: a role for protein S-100B?

INTRODUCTION

Prediction of the likely outcome of head injury from the outset would allow early rehabilitation to be targeted at those with most to gain. Clinical evaluation of a head injured patient may be confounded by intoxicants such as alcohol. Imaging modalities are insensitive (CT) or impractical (MR) for screening populations of such patients. A peripheral marker that reflected the extent of brain injury might offer an objective indication of likely adverse sequelae. This review evaluates the evidence for Protein S-100B as such a marker.

METHODS

A search of published literature revealed 18 studies designed to evaluate the relation between serum S-100B and measures of outcome after head injury.

RESULTS

A cut-off point of 2.5microg/L is related to dependent disability in those presenting with low conscious level, and may be a specific test for this. There appears to be a relation between initial serum S-100B concentration and measures of disability as well as post-concussion symptoms for those with seemingly mild injuries. There does not appear to be a relation between S-100B and measures of neuropsychological performance.

CONCLUSION

Patients with high levels of S-100B at initial assessment (>2.5microg/L) may represent a high risk group for disability after head trauma.

[Diffuse axonal injury in traumatic brain injury]

BACKGROUND

Head trauma of varying severity may induce diffuse axonal injury. More attention is now given to this important type of injury, as examinations of head-injured patients with MRI have given us more knowledge.

MATERIAL AND METHODS

We present a review of diffuse axonal injury with the main focus on clinical presentation and radiology, based on a Pubmed search and own experience.

RESULTS AND INTERPRETATION

Axons seldom rupture at the moment of injury. It is more common that it takes hours or a few days until the axons are detached. Areas most commonly affected are white matter in the hemispheres, corpus callosum and the brain stem. Half of the patients with severe head injury have diffuse axonal injury, but this type of injury also occurs in patients with moderate and mild head injury. The clinical presentation and prognosis will therefore vary. Diffuse axonal injury can present with typical signs revealed by CT, but the CT scan may also be normal, especially when there is no bleeding. New MRI techniques are more sensitive and show that diffuse axonal injury occurs more often than previously assumed. MRI is therefore necessary to give the patients correct diagnoses and adequate rehabilitation and follow-up.

Analysis of protein S-100B in serum: a methodological study

BACKGROUND

Dysfunction and damage of the human central nervous system can be detected with biochemical markers, and protein S-100B is the best-established such marker. The aim of this study was to evaluate whether the protein is stable during long-term storage, to establish reference values for the new Elecsys S100 test and to compare this new method with the Liaison Sangtec 100 test.

METHODS

We analysed blood samples from 118 blood donors and 196 patients with subarachnoid haemorrhage or head injury. The long-term stability of S-100B in frozen serum samples was evaluated with repeated analysis in 1997 and 2003 using an immunoradiometric assay. Method comparison between the Liaison Sangtec 100 and Elecsys S100 tests was performed using Bland-Altman difference plots.

RESULTS

Serum concentrations increased significantly during long-term storage (mean difference 0.15 microg/L; +/-2 SD, 0.55 microg/L). Serum measurements using the Elecsys S100 method in 118 healthy blood donors showed S-100B levels between 0.02 and 0.08 microg/L (mean 0.05). The 95th percentile was 0.07 microg/L. The Liaison Sangtec 100 test usually measured higher concentrations than the Elecsys S100 method, and the difference between the two methods increased with increasing concentrations. The mean difference between the methods was 0.14 microg/L (+/-2 SD, 0.39 microg/L).

CONCLUSIONS

Protein S-100B is not stable during long-term storage and the two analytical methods are not interchangeable.

Lumbar instrumented fusion compared with cognitive intervention and exercises in patients with chronic back pain after previous surgery for disc herniation: A prospective randomized controlled study

The effectiveness of lumbar fusion for chronic low back pain after surgery for disc herniation has not been evaluated in a randomized controlled trial. The aim of the present study was to compare the effectiveness of lumbar fusion with posterior transpedicular screws and cognitive intervention and exercises. Sixty patients aged 25-60 years with low back pain lasting longer than 1 year after previous surgery for disc herniation were randomly allocated to the two treatment groups. Experienced back surgeons performed transpedicular fusion. Cognitive intervention consisted of a lecture intended to give the patient an understanding that ordinary physical activity would not harm the disc and a recommendation to use the back and bend it. This was reinforced by three daily physical exercise sessions for 3 weeks. The primary outcome measure was the Oswestry Disability Index (ODI). Outcome data were analyzed on an intention-to-treat basis. Ninety-seven percent of the patients, including seven of eight patients who had either not attended treatment (n=5) or changed groups (n=2), completed 1-year follow-up. ODI was significantly improved from 47 to 38 after fusion and from 45 to 32 after cognitive intervention and exercises. The mean difference between treatments after adjustment for gender was -7.3 (95% CI -17.3 to 2.7, p=0.15). The success rate was 50% in the fusion group and 48% in the cognitive intervention/exercise group. For patients with chronic low back pain after previous surgery for disc herniation, lumbar fusion failed to show any benefit over cognitive intervention and exercises.

[Impact of Scandinavian guidelines on management of mild head injuries]

BACKGROUND

A national survey in 1996 showed insufficient routines for management of patients with mild head injuries in Norwegian hospitals. Since then, the Scandinavian guidelines for management of mild head injuries have been published.

METHODS

A cross-sectional questionnaire survey of management practice was performed in all 59 hospitals in 2002. We compared the results with figures from 1996 and evaluated guideline compliance.

RESULTS

The proportion of noncompliant hospitals was reduced (p = 0.02) from 52% to 31%. The proportion assessing patient consciousness according to the Glasgow Coma Scale increased (p = 0.001) from 49% to 80%. The proportion requiring a normal computed tomographic scan if a patient with a history of loss of consciousness was to be discharged from the emergency department increased (p < 0.001) from 2% to 19%.

CONCLUSION

The Scandinavian guidelines have had a significant impact on management practice in Norwegian hospitals.

[Treatment of intracranial aneurysms]

BACKGROUND

The department of neurosurgery at the University Hospital of North Norway has treated intracranial aneurysms since 1986. This study was conducted in order to evaluate outcomes after the introduction of endovascular therapy in 2000.

MATERIAL AND METHODS

We included all patients treated for intracranial aneurysms during the years 1999 through 2002 in a retrospective, cross-sectional study. Data were collected from patient files.

RESULTS

We treated 113 aneurysms in 104 patients in 108 procedures. 81 (78 %) patients were treated after a subarachnoid haemorrhage, while 23 (22 %) underwent treatment of an unruptured aneurysm. 75 (66 %) aneurysms were operated with craniotomy and clipping of the aneurysm neck, 38 (34 %) were treated with coiling. The choice of modality was dependent on the location and shape of the lesion. Complications related to the treatment were more common after surgical treatment than after coiling (41 versus 16 %, p=0.009), but the method of treatment did not influence long-term outcome evaluated according to the Glasgow Outcome Scale (GOS). All patients who underwent treatment for an unruptured aneurysm achieved a good outcome (GOS score 4 or 5), while patients treated after subarachnoid haemorrhage experienced significantly (p = 0.003) less favourable outcomes. Regression analysis revealed poor clinical condition (high Hunt & Hess grades) after the haemorrhage as the only independent predictor of outcome.

INTERPRETATION

The university hospital has treated an increasing proportion of patients with intracranial aneurysms with endovascular coiling after introduction of this method in 2000. The outcomes presented in this study equal those published from international multicentre trials.

Outcome 1 year after aneurysmal subarachnoid hemorrhage: relation between cognitive performance and neuroimaging

OBJECTIVE

To assess the cognitive impairment and the association between neuropsychological measures and neuroimaging 1 year after aneurysmal subarachnoid hemorrhage (SAH).

METHOD

Forty-two patients were examined clinically according to Glasgow Outcome Scale (GOS). Computed tomography (CT), single photon emission computed tomography (SPECT) and neuropsychological examination were performed.

RESULTS

There were no association between GOS and cognitive impairment index based on the neuropsychological examination. CT showed no sign of cerebral ischemia in 17 (40%) and low attenuating areas indicating cerebral infarction(s) in 25 (60%) patients. A significant correlation (P = 0.01) was observed between the cognitive impairment index and the SPECT index (r = 0.6). SPECT measurement was the only independent predictor for cognitive impairment.

CONCLUSION

GOS is a crude outcome measure and patients classified with good recoveries may have significant cognitive deficits. Neuropsychological examination is the preferred method for outcome evaluation as this method specifically addresses the disabilities affecting patients' everyday life.

Serial Single-photon Emission Computed Tomographic and Transcranial Doppler Measurements for Evaluation of Vasospasm after Aneurysmal Subarachnoid Hemorrhage

OBJECTIVE:

To assess the clinical value of serial single photon-emission computed tomographic (SPECT) measurements after aneurysmal subarachnoid hemorrhage (SAH).

METHODS:

Thirty-two patients were studied prospectively during the first 26 days after SAH with repeated SPECT measurements, clinical examinations, and transcranial Doppler recordings. Time trends were analyzed with a general linear model. A final SPECT measurement was performed after 1 year.

RESULTS:

A mean of 2.6 (range, 1–5) SPECT measurements revealed a significant (P = 0.001) quadratic curve consistent with initial hypoperfusion and then with hyperperfusion during the acute stage. SPECT findings were significantly associated with transcranial Doppler recordings (P = 0.016) and clinical assessments (P = 0.008). Patients fulfilling clinical and transcranial Doppler criteria for vasospasm demonstrated a more pronounced relative hypoperfusion-hyperperfusion time course. A multivariate logistic regression analysis identified SPECT measurements obtained during Days 7 to 14 after the SAH as the only independent predictor (β = 0.042, P = 0.02) for impaired perfusion after 1 year.

CONCLUSION:

Serial SPECT measurements after aneurysmal SAH demonstrate that regional changes in cerebral perfusion follow a nonlinear time trend, and repeated measurements are necessary. This observation, as well as the low feasibility of SPECT, restricts the clinical value of such measurements.

Health-related quality of life assessment by the EuroQol-5D can provide cost-utility data in the field of low-back surgery

There is limited data on the cost-utility of low-back surgical procedures. The EuroQol-5D (EQ-5D) is a generic health-related quality of life (HRQL) instrument, which was designed for cost-utility analyses and for comparisons of therapeutic effects across different diseases. Disease-specific (HRQL) instruments cannot be used for such purposes. However, there is little evidence of the usefulness of the EQ-5D in the field of low-back surgery, and it might be too general to assess specific conditions. We therefore tested its validity and responsiveness against a widely used disease-specific HRQL instrument [the Oswestry disability index (ODI)], in a prospective study on 326 patients operated for degenerative disorders in the lumbar spine. The reliability of the EQ-5D was also evaluated. Follow-up time was 12 months. Cross-sectional construct validity of the EQ-5D and ODI in the assessments of pain, functional status, health state and employment status were equal. The ODI performed better only in the assessment of walking capability. Only small differences in responsiveness were found. The reliability of the EQ-5D was solid. Our results indicate that the EQ-5D is useful for estimating health state values and for monitoring outcome of patients undergoing low-back surgery. Hence, this instrument would provide valid data for cost-utility analyses.

Raised serum S100B levels after acute bone fractures without cerebral injury

BACKGROUND

S100B, a protein abundant in astroglial cells within the central nervous system, has been shown to increase in cerebrospinal fluid and serum after various neurologic diseases. However, the cerebral specificity of S100B has been questioned. This study aims to show serum S100B levels after uncomplicated bone fractures in patients without current or prior neurologic diseases.

METHODS

Blood for sampling was drawn from patients seeking care at the emergency department presenting with various uncomplicated orthopedic fractures no older than 24 hours and having no previous or suspected neurologic disorder or head injury.

RESULTS

Fifty-five consecutive patients with acute fractures were included in the study. Serum S100B levels were raised above 0.15 microg/L in 16 of 55 (29%) patients (range, 0.02-0.51 microg/L; mean, 0.13 +/- 0.11 microg/L).

CONCLUSION

S100B levels were raised in 29% of patients with acute fractures without apparent cerebral injury, which suggests an extracerebral source of S100B. This information should be taken into account when interpreting S100B levels when dealing with brain damage.

The risk of "getting worse" after lumbar microdiscectomy

A frequent concern among patients operated for lumbar disc herniation is the risk of "getting worse". To give an evidence-based estimate of the risk for worsening has been difficult, since previous studies have been more focused on unfavourable outcome in general, rather than on deterioration in particular. In this prospective study of 180 patients, we report the frequency of and the risk factors for getting worse after first time lumbar microdiscectomy. Follow-up time was 12 months. Primary outcome measure was the Oswestry disability index, assessing functional status and health-related quality of life. Of the patients 4% got worse. Independent risk factors of deterioration were a long duration of sick leave and a better functional status and quality of life prior to operation. We conclude that the risk of deterioration is small, but larger if the patient has been unable to work despite relatively small health problems. This study also demonstrates that changes in instrument scores should be reported, so that an accurate failure rate can be assessed.

Neurosurgical teleconsultations in northern Norway

We carried out a prospective study of the effect of neurosurgical teleconsultations on patient management in northern Norway. The total number of teleradiology image transfers during an eight-month study period was 723. We recorded data on 99 (14%) of these teleconsultations, which concerned 92 patients; the remainder were transfers to other departments at our hospital and transfers of routine examinations from a small community hospital that did not have a radiologist. The neurosurgeon on call noted the clinical condition and response time for each consultation. The consequences of the teleconsultation and the eventual benefits of the image transfer were evaluated. All 10 referring hospitals in the region used the service. The median response time was 3 hours (range 1-21 hours) in emergency cases and 1 day (range 1-7 days) in ordinary consultations. The response time was significantly shorter for patients with head injuries (median 3 hours) than for those with intracranial tumours (median 24 hours). Image transfer was considered beneficial for the patient in 93% of the cases. Avoidance of unnecessary patient transfer, changes of treatment at the referring hospital on the advice of the neurosurgeon and initiation of emergency transfer occurred in 34%, 42% and 13% of cases, respectively. The results confirm that teleconsultations between referring hospitals and a regional neurosurgical service influence patient management and reduce the frequency of patient transfer.

Surgery for unruptured intracranial aneurysms in a low-volume neurosurgical unit

OBJECTIVES

To evaluate outcomes after surgical treatment for unruptured intracranial aneurysms in a low-volume neurosurgical unit.

MATERIAL AND METHODS

Consecutive patients operated during the years 1988-98 at the Department of Neurosurgery, University Hospital of North Norway, were studied retrospectively. Procedure-related complications were registered. The modified Rankin Scale and the Glasgow Outcome Scale, Extended version (GOS-E), were used for assessment of outcome.

RESULTS

Thirty-six aneurysms were repaired in 32 patients during 34 surgical procedures. Surgery-related central nervous system complications occurred in eight (25%) patients. The complication rate was 35% for the first 17 procedures, and 12% for the last 17. The latter group of procedures were performed during a period of 3 years, whereas the former group was spread over a period of 8 years. A favourable outcome (GOS-E score 6-8) was reached in 27 (84%) patients.

CONCLUSION

Decision-making in patients with unruptured intracranial aneurysms must be based on knowledge about institution-specific complication rates, preferably followed on a prospective basis.

Bifurcation geometry and the presence of cerebral artery aneurysms

Object. The angles of arterial bifurcations are governed by principles of work minimization (optimality principle). This determines the relationship between the angle of a bifurcation and the radii of the vessels. Nevertheless, the model is predicated on an absence of significant communication between these branches. The circle of Willis changes this relationship because the vessels proximal to the ring of vessels have additional factors that determine work minimization compared with more distal branches. This must have an impact on understanding of the relationship between shear stress and aneurysm formation. The authors hypothesized that normal bifurcations of cerebral arteries beyond the circle of Willis would follow optimality principles of minimum work and that the presence of aneurysms would be associated with deviations from optimum bifurcation geometry. Nevertheless, the vessels participating in (or immediately proximal to) the circle of Willis may not follow the geometric model as it is generally applied and this must also be investigated.

Methods. One hundred seven bifurcations of the middle cerebral artery (MCA), distal internal carotid artery (ICA), and basilar artery (BA) were studied in 55 patients. The authors analyzed three-dimensional reconstructions of digital subtraction angiography images with respect to vessel radii and bifurcation angles. The junction exponent (that is, a calculated measure of the division of flow at the bifurcation) and the difference between the predicted optimal and observed branch angles were used as measures of deviation from the geometry thought best to minimize work.

The mean junction exponent for MCA bifurcations was 2.9 ± 1.2 (mean ± standard deviation [SD]), which is close to the theoretical optimum of 3, but it was significantly smaller (p < 0.001; 1.7 ± 0.8, mean ± SD) for distal ICA bifurcations. In a multilevel multivariate logistic regression analysis, only the observed branch angles were significant independent predictors for the presence of an aneurysm. The odds ratio (OR) (95% confidence interval) for the presence of an aneurysm was 3.46 (1.02–11.74) between the lowest and highest tertile of the observed angle between the parent vessel and the largest branch. The corresponding OR for the smallest branch was 48.06 (9.7–238.2).

Conclusions. The bifurcation beyond the circle of Willis (that is, the MCA) closely approximated optimality principles, whereas the bifurcations within the circle of Willis (that is, the distal ICA and BA) did not. This indicates that the confluence of hemodynamic forces plays an important role in the distribution of work at bifurcations within the circle of Willis. In addition, the observed branch angles were predictors for the presence of aneurysms.

[Bipolar head injury with global amnesia]

We report the first case of bipolar head injury, that is, subsequent head injuries sustained near both poles of the Earth. The injury caused a true global amnesia with loss of memory for the journey around the globe. This case history illustrates how modern emergency services have reduced the hazards of polar exploration, and how a second impact after a primary head injury may cause life-threatening complications.

Mild Head Injuries: Impact of a National Strategy for Implementation of Management Guidelines

BACKGROUND

A national survey in 1996 showed insufficient routines for management of patients with mild head injuries in Norwegian hospitals. Since then, the Scandinavian Guidelines for Management of Mild Head Injuries have been published.

METHODS

A cross-sectional questionnaire survey of management practice was performed in all 59 hospitals in 2002. We compared the results with figures from 1996 and evaluated guideline compliance.

RESULTS

The proportion of noncompliant hospitals was reduced (p = 0.02) from 52% to 31%. The proportion assessing the patient's level of consciousness according to the Glasgow Coma Scale increased (p = 0.001) from 49% to 80%. The proportion requiring a normal computed tomographic scan if a patient with a history of loss of consciousness was to be sent home from the accident and emergency department increased (p < 0.001) from 1 (2%) to 13 (19%).

CONCLUSION

The Scandinavian Guidelines for Management of Mild Head Injuries have had a significant impact on management practice in Norwegian hospitals.

Randomized clinical trial of lumbar instrumented fusion and cognitive intervention and exercises in patients with chronic low back pain and disc degeneration

STUDY DESIGN

Single blind randomized study.

OBJECTIVES

To compare the effectiveness of lumbar instrumented fusion with cognitive intervention and exercises in patients with chronic low back pain and disc degeneration.

SUMMARY OF BACKGROUND DATA

To the authors' best knowledge, only one randomized study has evaluated the effectiveness of lumbar fusion. The Swedish Lumbar Spine Study reported that lumbar fusion was better than continuing physiotherapy and care by the family physician.

PATIENTS AND METHODS

Sixty-four patients aged 25-60 years with low back pain lasting longer than 1 year and evidence of disc degeneration at L4-L5 and/or L5-S1 at radiographic examination were randomized to either lumbar fusion with posterior transpedicular screws and postoperative physiotherapy, or cognitive intervention and exercises. The cognitive intervention consisted of a lecture to give the patient an understanding that ordinary physical activity would not harm the disc and a recommendation to use the back and bend it. This was reinforced by three daily physical exercise sessions for 3 weeks. The main outcome measure was the Oswestry Disability Index.

RESULTS

At the 1-year follow-up visit, 97% of the patients, including 6 patients who had either not attended treatment or changed groups, were examined. The Oswestry Disability Index was significantly reduced from 41 to 26 after surgery, compared with 42 to 30 after cognitive intervention and exercises. The mean difference between groups was 2.3 (-6.7 to 11.4) (P = 0.33). Improvements inback pain, use of analgesics, emotional distress, life satisfaction, and return to work were not different. Fear-avoidance beliefs and fingertip-floor distance were reduced more after nonoperative treatment, and lower limb pain was reduced more after surgery. The success rate according to an independent observer was 70% after surgery and 76% after cognitive intervention and exercises. The early complication rate in the surgical group was 18%.

CONCLUSION

The main outcome measure showed equal improvement in patients with chronic low back pain and disc degeneration randomized to cognitive intervention and exercises, or lumbar fusion.

Neurosurgery at the University Hospital of North Norway: the history of the northernmost neurosurgical department in the world

The university hospital of North Norway hosts the northernmost neurosurgical department in the world. The hospital is located in the city of Tromsø, often dubbed "the Gateway to the Arctic." We describe the role of this city in polar exploration, the history preceding the establishment of the world's northernmost university, the history of neurosurgery at this institution, and the present state of the Department of Neurosurgery. The experience from Tromsø shows that it is possible to establish a complete neurosurgical service at remote locations. Training of physicians native to the region, close integration between clinical activities and research, and a wide definition of the specialty has been essential for the success of the department.

Pre- and inter-hospital transport of severely head-injured patients in rural Northern Norway

The purpose of this study was to survey the time consumed during the pre- and inter-hospital transport of severely head injured patients in Northern Norway. All patients (n = 85) operated for an intracranial mass lesions within 48 h after injury during the 10-year period 1986-1995 were included in this retrospective analysis. Ambulance records, transfer notes, and hospital records were reviewed. The transport of patients was classified as either direct from the trauma scene to the University Hospital (direct admission group) or as an inter-hospital transfer (transfer group). Forty-seven (55%) patients were in the direct admission group, and 38 (45%) were transferred through another hospital. The majority of patients (81%) were transported by air ambulance. Median time from injury to arrival in the emergency room was 5 (1-44) h. Time necessary for transport was significantly (p < 0.001) shorter in the direct admission group (median 3 h) compared to the transfer group (median 8 h). The inter-hospital transfer time was < or = 3 h in 17%. Clearly, the advanced air ambulance service in Northern Norway makes rapid inter-hospital transfer possible despite extremely long geographical distances. Our findings indicate that this possibility is not always utilized.

Biochemical serum markers for brain damage: a short review with emphasis on clinical utility in mild head injury

PURPOSE

To provide an overview of clinical research on the use of biochemical serum markers for traumatic brain injury (TBI) in the evaluation of patients with mild head injuries (MHI).

METHODS

The MEDLINE database was searched for publications on biochemical serum markers of TBI until August 2002. Clinical studies addressing their use in MHI were reviewed.

RESULTS

Desirable characteristics for biochemical serum markers of TBI were identified. Creatine kinase isoenzyme BB (CK-BB), neuron specific enolase (NSE) and S-100B protein have been most extensively studied. The sensitivity and specificity of CK-BB is inadequate for use as an indicator of traumatic brain injury. Serum levels of NSE do not correspond to the amount of TBI, probably because of its long (20 h) half-life. S-100B serum levels are correlated to both clinical measures of injury severity, neuroradiological findings and outcomes in several studies from different authors.

CONCLUSION

Currently, S-100B protein is the most promising marker for evaluation of TBI in patients with MHI.