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Kratochvil D, Kreher B, Schnell S, Kümmerer D, Vry M, Umarova R, Weiller C, Saur D. Two white matter pathways for language. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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77
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Vry M, Saur D, Umarova R, Mast H, Mader I, Hamzei F, Weiller C. Reorganisation des motorischen Netzwerkes in der frühen Phase nach Schlaganfall. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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78
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Laible M, Hörer M, Wanschura J, Tepper M, Mader I, Weiller C, Hamzei F. Interaktion zwischen prämotorischem Kortex und primär sensomotorischem Kortex als Effekt der Spiegeltherapie. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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79
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Läppchen C, Laible M, Mader I, Weiller C, Hamzei F. Präsentation des „mirror neurons systems“ im Bereich des linken Gyrus frontalis inferior und prämotorischen Kortex bei Menschen. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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80
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Musso M, Schneider A, Büchel C, Weiller C. The „narrow faculty“ and Broca's area. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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81
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Maurer C, Nikkhah G, Weiller C. Postural deficits in Huntington's disease are partly different from those in Parkinson's disease. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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82
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Eisele J, Mader W, Feess D, Kreher B, Schnell S, Kümmerer D, Kratochvil D, Vry M, Umarova R, Schelter B, Weiller C, Saur D. Functionally and structurally defined cortical networks for repetition of words and pseudowords. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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83
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Lange R, Lee L, Weiller C, Siebner H. Theta burst stimulation triggers functional compensation within the primary motor and premotor cortex during motor skill acquisition. Brain Stimul 2008. [DOI: 10.1016/j.brs.2008.06.247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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84
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Harloff A, Dudler P, Frydrychowicz A, Strecker C, Stroh AL, Geibel A, Weiller C, Hetzel A, Hennig J, Markl M. Reliability of aortic MRI at 3 Tesla in patients with acute cryptogenic stroke. J Neurol Neurosurg Psychiatry 2008; 79:540-6. [PMID: 17965147 DOI: 10.1136/jnnp.2007.125211] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVES To evaluate a new three dimensional (3D) MRI protocol for the reliable detection of aortic high risk plaques compared with transoesophageal echocardiography (TOE) and to test the reliability of additional MRI in stroke of undetermined aetiology. METHODS 74 acute stroke patients were examined by both TOE and MRI at 3 Tesla with special regard to aortic high risk plaques (ie, > OR = 4 mm, superimposed thrombi). ECG synchronised pre- and post-contrast T1 weighted 3D imaging (spatial resolution approximately 1 mm3) covering the thoracic aorta was employed. In plaques > OR = 3 mm, additional two dimensional T2 imaging and time resolved (CINE) imaging sequences were performed. Aetiology of brain ischaemia was classified according to modified TOAST (Trial of Org 10172 in Acute Stroke Treatment) criteria. Aortic high risk embolic sources detected by MRI in patients with cryptogenic stroke were evaluated. RESULTS Differences in maximum aortic wall thickness for TOE and MRI were not statistically significant for all aortic segments. The overall number of high risk plaques detected by MRI (n = 74) was substantially higher compared with TOE (n = 47). Most noticeably, MRI identified aortic high risk pathologies in 8/26 (30.8%) patients with cryptogenic stroke after standard diagnostics, including TOE (n = 2: dissection or thrombus; n = 6: plaques > OR = 4 mm). CONCLUSIONS Our results demonstrate the feasibility of this 3D MRI protocol for the reliable detection of aortic high risk plaques in acute stroke patients. Because of improved visualisation of the aortic arch and the detection of additional embolic sources not seen by standard diagnostics, this novel technique may become a valuable tool for future patients with cryptogenic stroke.
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85
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Kaps M, Okonek A, Schuko S, Glauche V, Weiller C, Liepert J, Lange R. A longitudinal study of diffusion tensor imaging after severe traumatic brain injury. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1072955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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86
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Wenkeler V, Hassa T, Tüscher O, Weiller C, Dettmers C. Age dependency of activation in the visuomotor system during observation and imagination of motor acts. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1072927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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87
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Frings L, Abel S, Dressel K, Saur D, Kümmerer D, Mast H, Weiller C, Hüll M. Reduced precuneus deactivation during object naming in Dementia. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1072891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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88
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Lange R, Lee L, Weiller C, Siebner RH. Theta burst stimulation suppresses movement-related activity in the stimulated motor cortex but the motor system can cope with it. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1072926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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89
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Vry MS, Saur D, Umarova R, Kreher B, Schnell S, Glauche V, Mader I, Hamzei F, Weiller C. A dual-pathway model for motor cognition and sensorimotor integration: an fMRI-guided DTI study using probabilistic fiber tracking with connected weighted map combination. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1072912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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90
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Weiller C. Außergewöhnlich metastasiertes Gliosarkom als Spätrezidiv eines bestrahlten Spongioblastoms. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-2007-1020710] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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91
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Frackowiak RS, Weiller C, Chollet F. The functional anatomy of recovery from brain injury. CIBA FOUNDATION SYMPOSIUM 2007; 163:235-44; discussion 244-9. [PMID: 1815894 DOI: 10.1002/9780470514184.ch14] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The functional neuroanatomical basis for recovery from ischaemic brain injury is not known. We have used positron emission tomography (PET) to study changes in the functional organization of the brain in patients recovering from striatocapsular motor strokes. Significant changes in regional cerebral blood flow (rCBF) were found during repetitive sequential opposition movements of the fingers in normal subjects and in patients with recovery from motor deficits. There was a difference in the pattern of cerebral activation when patients performed the motor task with the unaffected hand (when the activation was lateralized to contralateral sensorimotor and premotor cortex and ipsilateral cerebellum) and when the task was performed with the recovered, previously plegic hand (when the activation was bilateral and involved novel areas of cortex, especially area 40). Comparisons of rCBF maps at rest in the patient group and in normal subjects showed areas with significantly decreased rCBF in the patients (contralateral to the plegic hand in the basal ganglia, thalamus, insular cortex, brainstem and ipsilateral cerebellum), which reflected the distribution of dysfunction caused by the ischaemic lesions. A significantly increased activation over and above that in normal subjects was found in patients during movement of the recovered fingers in ipsilateral premotor cortex and bilateral frontal opercular/insular regions and area 40, the ipsilateral basal ganglia (the ischaemic lesion lying contralaterally) and the contralateral cerebellum. We postulate that these findings may be explained by the generation of movements by pathways that are different from those that normal subjects use to perform what are ordinarily fairly simple, automated tasks. We suggest that this is a direct demonstration of cerebral plasticity resulting in the resolution of acquired motor deficits.
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92
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Reinhard M, Reinhard M, Wehrle-Wieland E, Grabiak D, Roth M, Guschlbauer B, Timmer J, Weiller C, Hetzel A. Oscillatory cerebral hemodynamics – the macro- versus microvascular level. Clin Neurophysiol 2007. [DOI: 10.1016/j.clinph.2006.11.198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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93
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Janzarik WG, Kratz CP, Loges NT, Olbrich H, Klein C, Schäfer T, Scheurlen W, Roggendorf W, Weiller C, Niemeyer C, Korinthenberg R, Pfister S, Omran H. Further evidence for a somatic KRAS mutation in a pilocytic astrocytoma. Neuropediatrics 2007; 38:61-3. [PMID: 17712732 DOI: 10.1055/s-2007-984451] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Astrocytomas are the most common brain tumors of childhood. However, knowledge of the molecular etiology of astrocytomas WHO grade I and II is limited. Germline mutations in the Ras-guanosine triphosphatase-activating protein, neurofibromin, in individuals with neurofibromatosis type I predispose to pilocytic astrocytomas. This association suggests that constitutive activation of the Ras signaling pathway plays a fundamental role in astrocytoma development. We screened 25 WHO I and II astrocytomas for mutations of PTPN11, NRAS, KRAS, and HRAS genes and identified the somatic G12A KRAS mutation in one pilocytic astrocytoma. These data suggest that Ras is rarely mutated in these tumors. Analyzed astrocytomas without mutations in Ras or neurofibromin may harbor mutations in other proteins of this pathway leading to hyperactive Ras signaling.
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Lange R, Weiller C, Liepert J. Chronic dose effects of reboxetine on motor skill acquisition and cortical excitability. J Neural Transm (Vienna) 2007; 114:1085-9. [PMID: 17401538 DOI: 10.1007/s00702-007-0662-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2006] [Accepted: 02/11/2007] [Indexed: 11/24/2022]
Abstract
BACKGROUND Enhancement of cortical excitability is thought to be beneficial for synaptic plasticity associated with motor skill acquisition. Single dose application of the selective norepinephrine reuptake inhibitor reboxetine (RBX) increases motor cortex excitability. In this study, we tested if a chronic dose application of RBX improved motor skill acquisition and modulated cortical excitability. METHODS The study was randomised, double blind and placebo-controlled. Twelve healthy subjects received four milligram RBX twice a day for four days preceded by two milligram RBX twice a day for two days. Each subject served as his own control. The time interval between the verum and the placebo session was 16 days or more. Measurement of cortical excitability by means of paired pulse transcranial magnetic stimulation (ppTMS) was conducted before and after the motor skill acquisition task in each session. The task was to lift two fingers of the right hand at once while the hand was positioned sprawled out on the table. The movements were self-paced and subjects had to perform as many moves as possible in 60 sec. Between seven blocks of self-paced movements six blocks with 60 single trials at a fixed interstimulus intervall were presented. Two equally difficult versions of the task using different finger combinations were established in order to avoid carry over effects in performance. The finger movements were recorded with a three-dimensional ultrasound movement analysis system (Zebris). RESULTS All subjects had substantial gain in performance across the selfpaced blocks. Average increase in number of correct moves was 87% (from 27.8 to 51.9). There was no significant difference neither between the versions of the task nor between placebo vs. verum. Also, there was no significant difference between first and second session, indicating that there was no carry over effect in performance. ppTMS revealed no significant differences in cortical excitability between groups. CONCLUSION The newly developed skill acquisition task yields robust single subject gain of performance. As the two versions of the task do not interact, it is suitable to be used in cross-over designs. In contrast to studies using single doses of RBX, motor cortex excitability seems to be unaffected in a steady-state induced by repeated drug applications. This could explain why RBX did not modulate motor behavior.
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Reinhard M, Wehrle-Wieland E, Roth M, Niesen WD, Timmer J, Weiller C, Hetzel A. Preserved dynamic cerebral autoregulation in the middle cerebral artery among persons with migraine. Exp Brain Res 2007; 180:517-23. [PMID: 17279380 DOI: 10.1007/s00221-007-0879-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2006] [Accepted: 01/10/2007] [Indexed: 10/23/2022]
Abstract
Migraine affects the autonomous nervous system and a recent investigation has also proposed a severe disturbance of dynamic cerebral blood flow regulation in the middle cerebral artery during spontaneous blood pressure oscillations. This study investigates whether dynamic cerebral autoregulation is impaired in persons with migraine among a normal cohort. Out of 94 adults studied to establish normal values for dynamic autoregulation, 19 suffered from migraine according to IHS criteria (10 of them with aura). Transcranial Doppler sonography and fingerplethysmography were used to determine dynamic autoregulation of both middle cerebral arteries following spontaneous low frequency (0.06-0.12 Hz) blood pressure fluctuations (phase and gain of transfer function, correlation coefficient indices Dx and Mx). No significant differences were found for the low frequency variability of blood pressure (power spectral density) and various indices of dynamic cerebral autoregulation between persons with and without migraine. Moreover, no differences were observed between persons with migraine, with and without aura. This study based on a normal cohort does not support the presence of generally impaired cerebral autoregulation dynamics in persons with migraine. Future studies should focus on posterior circulation and particular cerebellar autoregulation.
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96
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Umarova R, Saur D, Lind G, Reichardt S, Herpers M, Härle M, Tüscher O, Weiller C. Mapping of the attention system in patients with acute neglect. AKTUELLE NEUROLOGIE 2007. [DOI: 10.1055/s-2007-987953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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97
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Harloff A, Strecker C, Dudler P, Frydrychowicz A, Hetzel A, Geibel A, Weiller C, Hennig J, Markl M. Plaques in the descending aorta – a new risk factor for stroke? Visualization of embolization pathways in the thoracic aorta by 4D MRI at 3T. AKTUELLE NEUROLOGIE 2007. [DOI: 10.1055/s-2007-987599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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98
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Saur D, Schnell S, Kreher B, Küpper H, Kratochvil D, Umarova R, Kümmerer D, Abel S, Weiller C. fMRI-guided tractography of language processing streams in the healthy brain. AKTUELLE NEUROLOGIE 2007. [DOI: 10.1055/s-2007-987504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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99
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Marouf W, Hetzel A, Weiller C, Niesen WD. Zerebrale Perfusions-Sonographie: Diagnostische und Prognostische Wertigkeit im Vergleich zum Perfusions-MR. AKTUELLE NEUROLOGIE 2007. [DOI: 10.1055/s-2007-987493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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100
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Niesen WD, Schläger A, Weiller C. Intrakranielle Blutungsvolumina in der transkraniellen Duplexsonographie. AKTUELLE NEUROLOGIE 2007. [DOI: 10.1055/s-2007-987686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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