Diagnostic utility of Brain Injury Guidelines (BIG): systematic review and meta-analysis for prediction of neurosurgical intervention in traumatic brain injury.

BACKGROUND: The Brain Injury Guidelines (BIG) categorize the severity of Traumatic Brain Injury (TBI). The efficacy of BIG in predicting radiological deterioration and the necessity for neurosurgical intervention remains uncertain, as there is a lack of examination of pooled data from current literature despite validation in numerous single and multi-institutional studies. The aim of this study was to analyze existing studies to determine the diagnostic accuracy of BIG scoring criteria. METHODS: A systematic review and meta-analysis was conducted in accordance with PRISMA guidelines (PROSPEROID CRD42021277542). Three databases were searched, and articles published from 2000 to October 2022 were included (last search date: 25 November 2022). Pooled sensitivity and specificity were calculated using random effects meta-analysis. RESULTS: Of the 1130 articles identified, 13 were included in the analysis (9032 patients - 1433 BIG1, 2136 BIG2 & 3189 BIG3). A total of 2274 patients were not classified under either group. Pooled sensitivity for predicting neurosurgical intervention was 1.00 (95%CI:1.00-1.00), and 0.98 for radiological deterioration (95% CI: 0.927-0.996). The specificity in predicting radiological deterioration was 0.18 (95% CI: 0.16-0.21) and 0.05 for neurosurgical intervention (95% CI 0.05-0.05). CONCLUSIONS: The BIG score is highly sensitive at excluding TBI cases that do not require neurosurgical intervention; however, BIG-2 and BIG-3 might not be useful for ruling in TBI patients who require neurosurgical intervention.

Multimodal mapping and monitoring is beneficial during awake craniotomy for intra-cranial tumours: results of a dual centre retrospective study.

BACKGROUND: The combination of awake craniotomy with multimodal neurophysiological mapping and monitoring in intra-axial tumour resection is not well described, but may have theoretical benefits which we sought to investigate. METHODS: All patients undergoing awake craniotomy for tumour resection with cortical and/or subcortical stimulation together with one or more of electrocorticography (ECoG/EEG), motor or somatosensory evoked potentials were identified from the operative records of two surgeons at two centres over a 5 year period. Patient, operative and outcome data were collated. Statistical analysis was performed to evaluate factors predictive of intra-operative seizures and surgical outcomes. RESULTS: 83 patients with a median age 50 years (18-80 years) were included. 80% had gliomas (37% low grade) and 13% metastases. Cortical mapping was negative in 35% (language areas) and 24% (motor areas). Complete or near total resection was achieved in 80% with 5% severe long-term neurological deficits. Negative cortical mapping was combined with positive subcortical mapping in 42% with no significant difference in extent of resection rates to patients undergoing positive cortical mapping (p = 0.95). Awake mapping could not be completed in 14%, but with no compromise to extent of resection (p = 0.55) or complication rates (p = 0.09). Intraoperative seizures occurred in 11% and were significantly associated with intra-operative EEG spikes (p = 0.003). CONCLUSIONS: Awake multi-modal monitoring is a safe and well tolerated technique. It provides preservation of extent of resection and clinical outcomes in cases of aborted awake craniotomy. Negative cortical mapping in combination with positive subcortical mapping was also shown to be safe, although not hitherto well described. Electrocorticography further enables the differentiation of seizure activity from true positive mapping, and the successful treatment of spikes prior to full clinical seizures occurring.

Markedly Deranged Injury Site Metabolism and Impaired Functional Recovery in Acute Spinal Cord Injury Patients With Fever.

OBJECTIVES: To characterize the effect of fever after acute, traumatic spinal cord injury on injury site metabolism and patient outcome. DESIGN: Longitudinal cohort study. In 44 patients (London cohort), we determined the effect of fever on intrathecal injury site metabolism by analyzing 1,767 hours of intraspinal pressure and 759 hours of microdialysis data. We also determined the effect of fever burden, computed for the first 2 weeks in hospital, on neurologic outcome. A distinct cohort of 33 patients (Berlin cohort) was used to independently validate the effect of fever burden on outcome. SETTING: ICUs in London and Berlin. PATIENTS: Seventy-seven patients with acute, traumatic spinal cord injuries. INTERVENTIONS: In the London patients, a pressure probe and a microdialysis catheter were placed intradurally on the surface of the injured cord for up to a week. MEASUREMENTS AND MAIN RESULTS: Fever (> 37.5°C) occurs frequently (37% of the time) after spinal cord injury. High-grade fever (≥ 38°C) was associated with significantly more deranged metabolite levels than normothermia (36.5-37.5°C), that is, lower tissue glucose (median 2.0 vs 3.3 mM), higher lactate (7.8 vs 5.4 mM), higher glutamate (7.8 vs 6.4 µM), and higher lactate-to-pyruvate ratio (38.9 vs 29.3). High-grade fever was particularly detrimental on injury site metabolism when the peripheral leukocyte count was high. In the London and Berlin cohorts, high fever burden correlated with less neurologic improvement. CONCLUSIONS: Early after spinal cord injury, fever is associated with more deranged injury site metabolism than normothermia and worse prognosis.

Microdialysis to Optimize Cord Perfusion and Drug Delivery in Spinal Cord Injury.

OBJECTIVE: There is lack of monitoring from the injury site to guide management of patients with acute traumatic spinal cord injury. Here, we describe a bedside microdialysis monitoring technique for optimizing spinal cord perfusion and drug delivery at the injury site. METHODS: Fourteen patients were recruited within 72 hours of severe spinal cord injury. We inserted intradurally at the injury site a pressure probe, to monitor continuously spinal cord perfusion pressure, and a microdialysis catheter, to monitor hourly glycerol, glutamate, glucose, lactate, and pyruvate. The pressure probe and microdialysis catheter were placed on the surface of the injured cord. RESULTS: Microdialysis monitoring did not cause serious complications. Spinal cord perfusion pressure 90 to 100mm Hg and tissue glucose >4.5mM minimized metabolic derangement at the injury site. Increasing spinal cord perfusion pressure by ∼10mm Hg increased the entry of intravenously administered dexamethasone at the injury site 3-fold. INTERPRETATION: This study determined the optimum spinal cord perfusion pressure and optimum tissue glucose concentration at the injury site. We also identified spinal cord perfusion pressure as a key determinant of drug entry into the injured spinal cord. Our findings challenge current guidelines, which recommend maintaining mean arterial pressure at 85 to 90mm Hg for a week after spinal cord injury. We propose that future drug trials for spinal cord injury include pressure and microdialysis monitoring to optimize spinal cord perfusion and maximize drug delivery at the injury site. Ann Neurol 2016;80:522-531.

Metabolic profile of injured human spinal cord determined using surface microdialysis.

The management of patients having traumatic spinal cord injury would benefit from understanding and monitoring of spinal cord metabolic states. We hypothesized that the metabolism of the injured spinal cord could be visualized using Kohonen self-organizing maps. Sixteen patients with acute, severe spinal cord injuries were studied. Starting within 72 h of the injury, and for up to a week, we monitored the injury site hourly for tissue glucose, lactate, pyruvate, glutamate, and glycerol using microdialysis as well as intraspinal pressure and spinal cord perfusion pressure. A Kohonen map, which is an unsupervised, self-organizing topology-preserving neural network, was used to analyze 3366 h of monitoring data. We first visualized the different spinal cord metabolic states. Our data show that the injured cord assumes one or more of four metabolic states. On the basis of their metabolite profiles, we termed these states near-normal, ischemic, hypermetabolic, and distal. We then visualized how patients' intraspinal pressure and spinal cord perfusion pressure affect spinal cord metabolism. This revealed that for more than 60% of the time, spinal cord metabolism is patient-specific; periods of high intraspinal pressure or low perfusion pressure are not associated with specific spinal cord metabolic patterns. Finally, we determined relationships between spinal cord metabolism and neurological status. Patients with complete deficits have shorter periods of near-normal spinal cord metabolic states (7 ± 4% vs. 58 ± 12%, p < 0.01, mean ± standard error) and more variable injury site metabolic responses (metabolism spread in 70 ± 11 vs. 40 ± 6 hexagons, p < 0.05), compared with patients who have incomplete neurological deficits. We conclude that Kohonen maps allow us to visualize the metabolic responses of the injured spinal cord and may thus aid us in treating patients with acute spinal cord injuries.

Measurement of Intraspinal Pressure After Spinal Cord Injury: Technical Note from the Injured Spinal Cord Pressure Evaluation Study.

Intracranial pressure (ICP) is routinely measured in patients with severe traumatic brain injury (TBI). We describe a novel technique that allowed us to monitor intraspinal pressure (ISP) at the injury site in 14 patients who had severe acute traumatic spinal cord injury (TSCI), analogous to monitoring ICP after brain injury. A Codman probe was inserted subdurally to measure the pressure of the injured spinal cord compressed against the surrounding dura. Our key finding is that it is feasible and safe to monitor ISP for up to a week in patients after TSCI, starting within 72 h of the injury. With practice, probe insertion and calibration take less than 10 min. The ISP signal characteristics after TSCI were similar to the ICP signal characteristics recorded after TBI. Importantly, there were no associated complications. Future studies are required to determine whether reducing ISP improves neurological outcome after severe TSCI.

Intraspinal Pressure Monitoring in a Patient with Spinal Cord Injury Reveals Different Intradural Compartments: Injured Spinal Cord Pressure Evaluation (ISCoPE) Study.

BACKGROUND: We recently described a technique for monitoring intraspinal pressure (ISP) after traumatic spinal cord injury (TSCI). This is analogous to intracranial pressure monitoring after brain injury. We showed that, after severe TSCI, ISP at the injury site is elevated as the swollen cord is compressed against the dura. METHODS: In a patient with complete thoracic TSCI, we sequentially monitored subdural ISP above the injury, at the injury site, and below the injury intraoperatively. Postoperatively, we simultaneously monitored subdural ISP and intraparenchymal ISP at the injury site and compared the two ISP signals as well as their Fast Fourier Transform spectra. RESULTS: Subdural ISP recorded from the injury site was higher than subdural ISP recorded from above or below the injury site by more than 10 mmHg. The subdural and intraparenchymal ISP signals recorded from the injury site had comparable amplitudes and Fast Fourier Transform spectra. Intraparenchymal pulse pressure was twofold larger than subdural pulse pressure. CONCLUSION: After severe TSCI, three intradural compartments form (space above injury, injury site, space below injury) with different ISPs. At the level of maximum spinal cord swelling (injury site), subdural ISP is comparable to intraparenchymal ISP.

Monitoring of spinal cord perfusion pressure in acute spinal cord injury: initial findings of the injured spinal cord pressure evaluation study*.

OBJECTIVES: To develop a technique for continuously monitoring intraspinal pressure at the injury site (intraspinal pressure) after traumatic spinal cord injury. DESIGN: A pressure probe was placed subdurally at the injury site in 18 patients who had isolated severe traumatic spinal cord injury (American Spinal Injuries Association grades A-C). Intraspinal pressure monitoring started within 72 hours of the injury and continued for up to a week. In four patients, additional probes were inserted to simultaneously monitor subdural pressure below the injury and extradural pressure. Blood pressure was recorded from a radial artery catheter kept at the same horizontal level as the injured segment of the spinal cord. We determined the effect of various maneuvers on spinal cord perfusion pressure and spinal cord function and assessed using a limb motor score and motor-evoked potentials. SETTING: Neurosurgery and neuro-ICU covering a 3 million population in London. SUBJECTS: Patients with severe traumatic spinal cord injury. Control subjects without spinal cord injury (to monitor spinal cerebrospinal fluid signal and motor evoked potentials). INTERVENTIONS: Insertion of subdural spinal pressure probe. MEASUREMENTS AND MAIN RESULTS: There were no procedure-related complications. Intraspinal pressure at the injury site was higher than subdural pressure below the injury or extradural pressure. Average intraspinal pressure from the 18 patients with traumatic spinal cord injury was significantly higher than average intraspinal pressure from 12 subjects without traumatic spinal cord injury. Change in arterial PCO2, change in sevoflurane dose, and mannitol administration had no significant effect on intraspinal pressure or spinal cord perfusion pressure. Increase in inotrope dose significantly increased spinal cord perfusion pressure. Bony realignment and laminectomy did not effectively lower intraspinal pressure. Laminectomy was potentially detrimental by exposing the swollen spinal cord to compression forces applied to the skin. By intervening to increase spinal cord perfusion pressure, we could increase the amplitude of motor-evoked potentials recorded from below or just above the injury level in nine of nine patients with traumatic spinal cord injury. In two of two patients with American Spinal Injuries Association grade C traumatic spinal cord injury, higher spinal cord perfusion pressure correlated with increased limb motor score. CONCLUSIONS: Our findings provide proof-of-principle that subdural intraspinal pressure at the injury site can be measured safely after traumatic spinal cord injury.

Patient and caregiver return to work after a primary brain tumor.

Background: Studies focusing on the return to work (RTW) experiences of patients with a brain tumor (BT) are scarce. We aimed to explore, in-depth, the occupational expectations, experiences, and satisfaction of patients who RTW after a BT diagnosis and treatment, those not able to, and their family caregivers. Methods: This multicenter, cross-sectional study utilized semi-structured interviews and reflexive thematic analysis. Interviews were conducted with adults diagnosed with primary BT, in employment/self-employed before diagnosis, currently in follow-up care, and also with their caregivers. Results: In total, 23 interviews (17 patients/6 caregivers) took place. Five themes were developed: (1) Early (adjustments and) expectations: "Thought I would be back at work the following Monday"; pre-treatment patients wanted to be better informed about potential recovery time and side-effects. (2) Drivers to RTW: "Getting my life back on track"; RTW was seen as a symbol of normality and also dictated by financial pressures. (3) Experiences returning to work: "It's had its ups and downs": patients who had successfully returned were supported by employers financially, emotionally, and practically. (4) Required support: "He had surgery and that was it": suggested support included a back-to-work scheme and comprehensive financial support. (5) Caring and paid work: The "juggling act": carer's work was significantly impacted; often reducing/increasing their working hours while managing increasing caring demands. Conclusions: Future research focusing on RTW in neuro-oncology populations is needed. Interventions should be developed to improve employer/employee communication, and increase knowledge about BT care and possibilities for RTW, to support patients and caregivers towards sustained employment.

Utility of image-guided external ventriculostomy: analysis of contemporary practice in the United Kingdom and Ireland.

OBJECTIVE: Freehand external ventricular drain (EVD) insertion is associated with a high rate of catheter misplacement. Image-guided EVD placement with neuronavigation or ultrasound has been proposed as a safer, more accurate alternative with potential to facilitate proper placement and reduce catheter malfunction risk. This study aimed to determine the impact of image-guided EVD placement on catheter tip position and drain functionality. METHODS: This study is a secondary analysis of a data set from a prospective, multicenter study. Data were collated for EVD placements undertaken in the United Kingdom and Ireland from November 2014 to April 2015. In total, 21 large tertiary care academic medical centers were included. RESULTS: Over the study period, 632 EVDs were inserted and 65.9% had tips lying free-floating in the CSF. Only 19.6% of insertions took place under image guidance. The use of image guidance did not significantly improve the position of the catheter tip on postoperative imaging, even when stratified by ventricular size. There was also no association between navigation use and drain blockage. CONCLUSIONS: Image-guided EVD placement was not associated with an increased likelihood of achieving optimal catheter position or with a lower rate of catheter blockage. Educational efforts should aim to enhance surgeons' ability to apply the technique correctly in cases of disturbed cerebral anatomy or small ventricles to reduce procedural risks and facilitate effective catheter positioning.

CovidNeuroOnc: A UK multicenter, prospective cohort study of the impact of the COVID-19 pandemic on the neuro-oncology service.

BACKGROUND: The COVID-19 pandemic has profoundly affected cancer services. Our objective was to determine the effect of the COVID-19 pandemic on decision making and the resulting outcomes for patients with newly diagnosed or recurrent intracranial tumors. METHODS: We performed a multicenter prospective study of all adult patients discussed in weekly neuro-oncology and skull base multidisciplinary team meetings who had a newly diagnosed or recurrent intracranial (excluding pituitary) tumor between 01 April and 31 May 2020. All patients had at least 30-day follow-up data. Descriptive statistical reporting was used. RESULTS: There were 1357 referrals for newly diagnosed or recurrent intracranial tumors across 15 neuro-oncology centers. Of centers with all intracranial tumors, a change in initial management was reported in 8.6% of cases (n = 104/1210). Decisions to change the management plan reduced over time from a peak of 19% referrals at the start of the study to 0% by the end of the study period. Changes in management were reported in 16% (n = 75/466) of cases previously recommended for surgery and 28% of cases previously recommended for chemotherapy (n = 20/72). The reported SARS-CoV-2 infection rate was similar in surgical and non-surgical patients (2.6% vs. 2.4%, P > .9). CONCLUSIONS: Disruption to neuro-oncology services in the UK caused by the COVID-19 pandemic was most marked in the first month, affecting all diagnoses. Patients considered for chemotherapy were most affected. In those recommended surgical treatment this was successfully completed. Longer-term outcome data will evaluate oncological treatments received by these patients and overall survival.

Neurostenalgia of the femoral nerve: a treatable cause of intractable hip pain in a young adult.

Neurostenalgia of the femoral nerve is a compressive neuropathy that can result in debilitating pain. It often presents as hip pain, may coexist with other pathologic condition, and may be missed. Diagnosis and treatment affords great relief of symptoms. We present a patient with hip pain that persisted for 10 years, despite multiple orthopedic interventions including pelvic osteotomy and arthroplasty. Femoral neurostenalgia was eventually identified, and pain was relieved after decompression of the nerve.

Minimally Invasive Resection of Brain Metastases.

BACKGROUND: Minimally invasive resection of brain metastases aims to maximize resection while minimizing brain trauma. METHODS: Patients with 1 or more metastases that underwent resection following neuro-oncology multidisciplinary meeting discussion from September 2014 to October 2018, with pre- and postoperative magnetic resonance imaging, were included. All patients including posterior fossa metastases or multiple metastases were positioned supine. Hair was not shaved. Volumetric postcontrast T1 magnetic resonance imaging was used for incision planning and neuronavigation. The craniotomy site was tailored to tumor depth according to keyhole principles and ranged between 2 and 5 cm. Intraoperative monitoring and awake mapping were carried out in selected cases. RESULTS: Out of 320 consecutive patients with brain metastases, 44 patients were identified as suitable for minimally invasive resection. Nine patients had no postoperative imaging and were excluded. There were 38 metastases in 35 patients. There were 18 cerebellar metastases, 10 frontal, 3 parietal, 3 occipital, 2 temporal, 1 intraventricular, and 1 basal ganglia. Median length of stay was 3 days (range, 1-24). Average tumor volume was 54.7 cm3 (range, 10-240 cm3). Endoscopic assistance was used in 4 patients. Median performance status improved from 2 to 1 (range, preoperative: 0-4; postoperative: 0-2). Median survival was 14.7 months. CONCLUSIONS: Minimally invasive resection of brain metastasis is safe and effective, and in selected cases confers advantages compared with standard techniques.

The Prevalence of Cerebrovascular Abnormalities Detected in Various Diagnostic Subgroups of Spontaneous Subarachnoid Hemorrhage in the Modern Era.

OBJECTIVE: To determine prevalence of cerebrovascular abnormalities in diagnostic subgroups of spontaneous subarachnoid hemorrhage (SAH) in a regional neurosurgical center in the modern era. METHODS: Data of 609 consecutive patients with spontaneous SAH in a 3-year period (August 2010 to August 2013) were prospectively collected. Patients were divided into 3 diagnostic subgroups: computed tomography (CT) positive for SAH; CT negative but positive cerebrospinal fluid examination by spectrophotometry for SAH; CT negative for SAH and inconclusive cerebrospinal fluid examination. All patients fit for intervention underwent CT angiography with or without digital subtraction angiography to identify vascular abnormalities for subsequent treatment. RESULTS: Of 609 patients, 554 were fit for further investigation and consideration of further intervention; 514 patients had confirmed SAH. Mean patient age was 54.0 years; 61.5% of patients were women. Of patients, 390 (75.9%) showed vascular abnormalities on angiography. There were 438 patients (85.2%) with confirmed SAH diagnosed on CT scan (group 1). Vascular abnormalities were detected in 81.1% of patients; 18.9% of patients with positive CT scan had no identifiable cause of SAH. Of patients with confirmed SAH, 76 (14.8%) had negative CT scan but positive lumbar puncture (group 2); 46.1% of patients in this group had vascular abnormalities. Three patients with inconclusive cerebrospinal fluid examination had lesions requiring treatment. Median length of hospital stay in group 1 patients was longer than median length of hospital stay in group 2 patients. CONCLUSIONS: Frequency of vascular abnormalities in spontaneous SAH is lower than the traditionally quoted figure, which has diagnostic and prognostic implications for patient management.

Safety profile and probe placement accuracy of intraspinal pressure monitoring for traumatic spinal cord injury: Injured Spinal Cord Pressure Evaluation study.

OBJECTIVE A novel technique for monitoring intraspinal pressure and spinal cord perfusion pressure in patients with traumatic spinal cord injury was recently described. This is analogous to monitoring intracranial pressure and cerebral perfusion pressure in patients with traumatic brain injury. Because intraspinal pressure monitoring is a new technique, its safety profile and impact on early patient care and long-term outcome after traumatic spinal cord injury are unknown. The object of this study is to review all patients who had intraspinal pressure monitoring to date at the authors' institution in order to define the accuracy of intraspinal pressure probe placement and the safety of the technique. METHODS At the end of surgery to fix spinal fractures, a pressure probe was inserted intradurally to monitor intraspinal pressure at the injury site. Postoperatively, CT scanning was performed within 48 hours and MRI at 2 weeks and 6 months. Neurointensive care management and complications were reviewed. The American Spinal Injury Association Impairment Scale (AIS) grade was determined on admission and at 2 to 4 weeks and 12 to 18 months postoperation. RESULTS To date, 42 patients with severe traumatic spinal cord injuries (AIS Grades A-C) had undergone intraspinal pressure monitoring. Monitoring started within 72 hours of injury and continued for up to a week. Based on postoperative CT and MRI, the probe position was acceptable in all patients, i.e., the probe was located at the site of maximum spinal cord swelling. Complications were probe displacement in 1 of 42 patients (2.4%), CSF leakage that required wound resuturing in 3 of 42 patients (7.1%), and asymptomatic pseudomeningocele that was diagnosed in 8 of 42 patients (19.0%). Pseudomeningocele was diagnosed on MRI and resolved within 6 months in all patients. Based on the MRI and neurological examination results, there were no serious probe-related complications such as meningitis, wound infection, hematoma, wound breakdown, or neurological deterioration. Within 2 weeks postoperatively, 75% of patients were extubated and 25% underwent tracheostomy. Norepinephrine was used to support blood pressure without complications. Overall, the mean intraspinal pressure was around 20 mm Hg, and the mean spinal cord perfusion pressure was around 70 mm Hg. In laminectomized patients, the intraspinal pressure was significantly higher in the supine than lateral position by up to 18 mm Hg after thoracic laminectomy and 8 mm Hg after cervical laminectomy. At 12 to 18 months, 11.4% of patients had improved by 1 AIS grade and 14.3% by at least 2 AIS grades. CONCLUSIONS These data suggest that after traumatic spinal cord injury intradural placement of the pressure probe is accurate and intraspinal pressure monitoring is safe for up to a week. In patients with spinal cord injury who had laminectomy, the supine position should be avoided in order to prevent rises in intraspinal pressure.

Magnetic Resonance Imaging of the Codman Microsensor Transducer Used for Intraspinal Pressure Monitoring: Findings From the Injured Spinal Cord Pressure Evaluation Study.

STUDY DESIGN: Laboratory and human study. OBJECTIVE: To test the Codman Microsensor Transducer (CMT) in a cervical gel phantom. To test the CMT inserted to monitor intraspinal pressure in a patient with spinal cord injury. SUMMARY OF BACKGROUND DATA: We recently introduced the technique of intraspinal pressure monitoring using the CMT to guide management of traumatic spinal cord injury [Werndle et al. Crit Care Med 2014;42:646]. This is analogous to intracranial pressure monitoring to guide management of patients with traumatic brain injury. It is unclear whether magnetic resonance imaging (MRI) of patients with spinal cord injury is safe with the intraspinal pressure CMT in situ. METHODS: We measured the heating produced by the CMT placed in a gel phantom in various configurations. A 3-T MRI system was used with the body transmit coil and the spine array receive coil. A CMT was then inserted subdurally at the injury site in a patient who had traumatic spinal cord injury and MRI was performed at 1.5 T. RESULTS: In the gel phantom, heating of up to 5°C occurred with the transducer wire placed straight through the magnet bore. The heating was abolished when the CMT wire was coiled and passed away from the bore. We then tested the CMT in a patient with an American Spinal Injuries Association grade C cervical cord injury. The CMT wire was placed in the configuration that abolished heating in the gel phantom. Good-quality T1 and T2 images of the cord were obtained without neurological deterioration. The transducer remained functional after the MRI. CONCLUSION: Our data suggest that the CMT is MR conditional when used in the spinal configuration in humans. Data from a large patient group are required to confirm these findings. LEVEL OF EVIDENCE: N/A.

Expansion duroplasty improves intraspinal pressure, spinal cord perfusion pressure, and vascular pressure reactivity index in patients with traumatic spinal cord injury: injured spinal cord pressure evaluation study.

We recently showed that, after traumatic spinal cord injury (TSCI), laminectomy does not improve intraspinal pressure (ISP), spinal cord perfusion pressure (SCPP), or the vascular pressure reactivity index (sPRx) at the injury site sufficiently because of dural compression. This is an open label, prospective trial comparing combined bony and dural decompression versus laminectomy. Twenty-one patients with acute severe TSCI had re-alignment of the fracture and surgical fixation; 11 had laminectomy alone (laminectomy group) and 10 had laminectomy and duroplasty (laminectomy+duroplasty group). Primary outcomes were magnetic resonance imaging evidence of spinal cord decompression (increase in intradural space, cerebrospinal fluid around the injured cord) and spinal cord physiology (ISP, SCPP, sPRx). The laminectomy and laminectomy+duroplasty groups were well matched. Compared with the laminectomy group, the laminectomy+duroplasty group had greater increase in intradural space at the injury site and more effective decompression of the injured cord. In the laminectomy+duroplasty group, ISP was lower, SCPP higher, and sPRx lower, (i.e., improved vascular pressure reactivity), compared with the laminectomy group. Laminectomy+duroplasty caused cerebrospinal fluid leak that settled with lumbar drain in one patient and pseudomeningocele that resolved completely in five patients. We conclude that, after TSCI, laminectomy+duroplasty improves spinal cord radiological and physiological parameters more effectively than laminectomy alone.

The Diagnosis and Management of Brain Arteriovenous Malformations in a Single Regional Center.

BACKGROUND: Cerebral arteriovenous malformations are vascular abnormalities in which arteriovenous shunting occurs through an abnormal vascular network (nidus) in the parenchyma. These lesions typically present by the third decade of life with cerebral bleeding, seizures, headache, or neurologic deficits; however, they are sometimes found incidentally. METHODS: A retrospective analysis of intracranial AVMs referred to a single regional center, over a 7-year period, was performed to review the clinical presentation, pathologic features and management outcomes from January 2005 to December 2012. RESULTS: We identified 142 patients (56% female, age range 4-69 years). Emergency referrals accounted for 87% of the cohort with the most frequent presentation being headache and/or hemorrhage. More than half (52%) of the cases were observed to have a neurologic deficit on examination. The modal Spetzler-Martin Grade was 3 with 76% of lesions located in areas of eloquent brain and 57% of cases in the dominant hemisphere. Half of the cases had multiple feeder vessels, and 29% were associated with aneurysms. The nidus was obliterated in 91% of cases actively managed. Two thirds of patients were successfully treated with a single modality, the most common being embolization. Only 8% of cases were managed conservatively. Additionally, 93% of aneurysms identified were treated successfully. The complication rate was 7% with 2% of reported infection. CONCLUSIONS: The burden of AVM management is significantly enhanced by the number of emergency referrals. Interestingly, complication rates are higher in the unruptured cohort. Surgical management is the most effective modality, but it carries the highest complication rate. This accompanied by the challenges of AVM anatomy and associated pathology argue for expert service provision in a single center.

Intraspinal pressure and spinal cord perfusion pressure after spinal cord injury: an observational study.

OBJECT: In contrast to intracranial pressure (ICP) in traumatic brain injury (TBI), intraspinal pressure (ISP) after traumatic spinal cord injury (TSCI) has not received the same attention in terms of waveform analysis. Based on a recently introduced technique for continuous monitoring of ISP, here the morphological characteristics of ISP are observationally described. It was hypothesized that the waveform analysis method used to assess ICP could be similarly applied to ISP. METHODS: Data included continuous recordings of ISP and arterial blood pressure (ABP) in 18 patients with severe TSCI. RESULTS: The morphology of the ISP pulse waveform resembled the ICP waveform shape and was composed of 3 peaks representing percussion, tidal, and dicrotic waves. Spectral analysis demonstrated the presence of slow, respiratory, and pulse waves at different frequencies. The pulse amplitude of ISP was proportional to the mean ISP, suggesting a similar exponential pressure-volume relationship as in the intracerebral space. The interaction between the slow waves of ISP and ABP is capable of characterizing the spinal autoregulatory capacity. CONCLUSIONS: This preliminary observational study confirms morphological and spectral similarities between ISP in TSCI and ICP. Therefore, the known methods used for ICP waveform analysis could be transferred to ISP analysis and, upon verification, potentially used for monitoring TSCI patients.