| 1. |
- Andersson, Linnea, et al.
(författare)
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Flash visual evoked potentials are unreliable as markers of ICP due to high variability in normal subjects.
- 2012
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Ingår i: Acta neurochirurgica. - : Springer Science and Business Media LLC. - 0942-0940 .- 0001-6268. ; 154:1, s. 121-127
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Previous publications have suggested a high correlation between flash visual evoked potential (F-VEP) N2 peak latency and intracranial pressure. This would enable F-VEP to be used as a non-invasive and inexpensive method to estimate ICP in a number of settings. However, basic knowledge about variability across subjects and test-retest properties of the F-VEP is lacking. METHODS: Fifteen healthy adult subjects were tested on three different occasions. F-VEP responses were recorded using international standards. FINDINGS: For the tested population, mean N2 latency was 65.7ms (SD 10.7ms) and the range was 48-110ms. Intra-individual variability was high, in four of the 15 subjects more than 15ms between testing sessions. The same was found for P2 latency and for N2 and P2 amplitudes. The response waveform was very variable and unambiguous marking of peaks was often diffucult. One out of the 15 subjects had a very poorly developed F-VEP response, but a normal pattern-reversal VEP response. CONCLUSIONS: F-VEP has a wide range of latency, amplitude and waveform across normal subjects. A large proportion of subjects also had a high intra-individual variability over time. This variability makes F-VEPs unreliable as a marker for intracranial pressure, and caution in interpreting F-VEP changes in clinical work is advised.
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| 2. |
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| 3. |
- Blomstedt, Patric, et al.
(författare)
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Deep brain stimulation of the subthalamic nucleus versus the zona incerta in the treatment of essential tremor
- 2011
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Ingår i: Acta Neurochirurgica. - Wien : Springer. - 0001-6268 .- 0942-0940. ; 153:12, s. 2329-2335
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Tidskriftsartikel (refereegranskat)abstract
- Background: Deep brain stimulation (DBS) is an effective treatment for essential tremor (ET). Currently the ventrolateral thalamus is the target of choice, but the posterior subthalamic area (PSA), including the caudal zona incerta (cZi), has demonstrated promising results, and the subthalamic nucleus (STN) has been suggested as a third alternative. The objective of the current study was to evaluate the effect of STN DBS in ET and to compare this to cZi DBS. Methods: Four patients with ET were implanted with two ipsilateral electrodes, one in the STN and one in the cZi. All contacts were evaluated concerning the acute effect on tremor, and the effect of chronic DBS in either target was analyzed. Results: STN and cZi both proved to be potent targets for DBS in ET. DBS in the cZi was more efficient, since the same degree of tremor reduction could here be achieved at lower energy consumption. Three patients became tremor-free in the treated hand with either STN or cZi DBS, while the fourth had a minor residual tremor after stimulation in either target. Conclusion: In this limited material, STN DBS was demonstrated to be an efficient treatment for ET, even though cZi DBS was more efficient. The STN may be an alternative target in the treatment of ET, pending further investigations to decide on the relative merits of the different targets.
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| 4. |
- Bobinski, Lukas, et al.
(författare)
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Dynamics of brain tissue changes induced by traumatic brain injury assessed with the Marshall, Morris-Marshall, and the Rotterdam classifications and its impact on outcome in a prostacyclin placebo-controlled study
- 2012
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Ingår i: Acta Neurochirurgica. - : Springer Science and Business Media LLC. - 0001-6268 .- 0942-0940. ; 154:6, s. 1069-1079
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Tidskriftsartikel (refereegranskat)abstract
- The present study evaluates the types and dynamics of intracranial pathological changes in patients with severe traumatic brain injury (sTBI) who participated in a prospective, randomized, double-blinded study of add-on treatment with prostacyclin. Further, the changes of brain CT scan and their correlation to Glasgow Coma Scale score (GCS), maximal intracranial pressure (ICPmax), minimal cerebral perfusion pressure (CPPmin), and Glasgow Outcome Score (GOS) at 3, 6, and 12 months were studied. Forty-eight subjects with severe traumatic brain injury were treated according to an ICP-targeted therapy protocol based on the Lund concept with the addition of prostacyclin or placebo. The first available CT scans (CTi) and follow-up scans nearest to 24 h (CT24) were evaluated using the Marshall, Rotterdam, and Morris-Marshall classifications. There was a significant correlation of the initial Marshall, Rotterdam, Morris-Marshall classifications and GOS at 3 and 12 months. The CT24 Marshall classification did not significantly correlate to GOS while the Rotterdam and the Morris-Marshall classification did. The CTi Rotterdam classification predicted outcome evaluated as GOS at 3 and 12 months. Prostacyclin treatment did not influence the dynamic of tissue changes. The Rotterdam classification seems to be appropriate for describing the evolution of the injuries on the CT scans and contributes in predicting of outcome in patients treated with an ICP-targeted therapy. The Morris-Marshall classification can also be used for prognostication of outcome but it describes only the impact of traumatic subarachnoid hemorrhage (tSAH).
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| 5. |
- Clausen, Fredrik, et al.
(författare)
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Cerebral glucose metabolism after traumatic brain injury in the rat studied by C-13-glucose and microdialysis
- 2011
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Ingår i: Acta Neurochirurgica. - : Springer Science and Business Media LLC. - 0001-6268 .- 0942-0940. ; 153:3, s. 653-658
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Tidskriftsartikel (refereegranskat)abstract
- Following traumatic brain injury (TBI), a disturbed cerebral glucose metabolism contributes to secondary brain damage. To study local cerebral glucose metabolism after TBI, we delivered C-13-labeled glucose into brain tissue by microdialysis (MD). MD probes were inserted bilaterally into the parietal cortex of rat brain, one probe in the shear stress zone of the injury and the other at the corresponding contralateral coordinates. A moderately severe controlled cortical contusion was used to model TBI. Dialysate concentrations of glucose, pyruvate, lactate, and glycerol were measured, and following derivatization, C-13 enrichments of the compounds were determined by gas chromatography-mass spectrometry. We found that C-13-labeled glucose was rapidly converted into C-13-lactate and C-13-glycerol. In the hours following TBI, concentrations and C-13 enrichments of lactate and glycerol increased. The findings confirm the occurrence of anaerobic local glucose metabolism early after TBI. Only a small fraction of the glycerol was newly synthesized, suggesting that the hypothesis that most of the released glycerol after TBI comes from degradation of membrane phospholipids still holds. We conclude that the combination of microdialysis and stable isotope technique is a useful tool for investigating local glucose metabolism following brain injury.
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| 7. |
- Fischerström, Ann, et al.
(författare)
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Acute neurosurgery for traumatic brain injury by general surgeons in Swedish county hospitals : A regional study
- 2014
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Ingår i: Acta Neurochirurgica. - : Springer Science and Business Media LLC. - 0001-6268 .- 0942-0940. ; 156:1, s. 177-185
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Tidskriftsartikel (refereegranskat)abstract
- Traditionally acute life-saving evacuations of extracerebral haematomas are performed by general surgeons on vital indication in county hospitals in the Uppsala-A-rebro health care region in Sweden, a region characterized by long distances and a sparsely distributed population. Recently, it was stated in the guidelines for prehospital care of traumatic brain injury from the Scandinavian Neurosurgical Society that acute neurosurgery should not be performed in smaller hospitals without neurosurgical expertise. The aim of this study was to investigate: how often does acute decompressive neurosurgery occur in county hospitals in the Uppsala-A-rebro region today, what is the indication for surgery, and what is the clinical outcome? Finally, the goal was to evaluate whether the current practice in the Uppsala-A-rebro region should be revised. Patients referred to the neurointensive care unit at the Department of Neurosurgery in Uppsala after acute evacuation of intracranial haematomas in the county hospitals 2005-2010 were included in the study. Data was collected retrospectively from the medical records following a predefined protocol. The presence of vital indication, radiological and clinical results, and long-term outcome were evaluated. A total of 49 patients (17 epidural haematomas and 32 acute subdural haematomas) were included in the study. The operation was judged to have been performed on vital indication in all cases. The postoperative CT scan was improved in 92 % of the patients. The reaction level and pupillary reactions were significantly improved after surgery. Long-term outcomes showed 51 % favourable outcome, 33 % unfavourable outcome, and in 16 % the outcome was unknown. Looking at the indication for acute neurosurgery, the postoperative clinical and radiological results, and the long-term outcome, it appears that our regional policy regarding life-saving decompressive neurosurgery in county hospitals by general surgeons should not be changed. We suggest a curriculum aimed at educating general surgeons in acute neurosurgery.
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| 10. |
- Hedlund, Mathilde, 1968-, et al.
(författare)
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Coping strategies, health-related quality of life and psychiatric history in patients with aneurysmal subarachnoid haemorrhage
- 2010
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Ingår i: Acta Neurochirurgica. - : Springer Science and Business Media LLC. - 0001-6268 .- 0942-0940. ; 152:8, s. 1375-1382
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Tidskriftsartikel (refereegranskat)abstract
- Subarachnoid haemorrhage (SAH) reduces health-related quality of life (HRQoL) and increases the risk of psychiatric sequels such as depression and posttraumatic stress disorder. Especially those with a psychiatric history and those using maladaptive coping strategies are at risk for such sequels. The extent to which HRQoL after SAH was related to a history of psychiatric morbidity and to the use of various coping strategies was assessed. Patients admitted to the Uppsala University Hospital with aneurysmal SAH (n = 59) were investigated prospectively. Seven months after SAH, data were collected using the Structured Clinical Interview for DSM-IV axis I disorders, the Short Form-36 (SF-36) Health Survey and the Jalowiec Coping Scale. Patients with SAH had lower HRQoL than the general Swedish population in all eight domains of the SF-36. The lower HRQoL was almost entirely in the subgroup with a psychiatric history. HRQoL was also strongly correlated to the use of coping. Physical domains of SF-36 were less affected than mental domains. Those with a psychiatric history used more coping than the remainder with respect to all emotional coping scales. Coping and the presence of a psychiatric history were more strongly related to mental than to physical components of HRQoL. A psychiatric history and the use of maladaptive emotional coping were related to worse HRQoL, more to mental than to physical aspects.
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