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排序方式: 共有470条查询结果,搜索用时 15 毫秒
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I. Y. Shvera A. M. Cherniavsky W. Yu. Ussov M. P. Plotnikov A. A. Sokolov V. M. Shipulin V. I. Chernov 《European journal of nuclear medicine and molecular imaging》1995,22(2):132-138
In this study we aimed to work out a quantitative prognostic index for preoperative assessment of brain technetium-99m hexamethylpropylene amine oxime (HMPAO) single-photon emission tomography (SPET) in patients referred for urgent carotid endarterectomy due to acute obstructive disease of the internal carotid artery (ICA) and neurological deficit. To this end we compared data from preoperative SPET studies with the postinterventional changes in neurological status in 20 patients (17 males, three females; mean age 53 years, SD 4 years) with acute ischaemic cerebral disorders induced by obstruction of the ICA. Carotid obstruction was diagnosed by ultrasound B-mode study. All patients underwent urgent carotid endarterectomy from the ICA. Patients were divided into two groups in accordance with the results of postoperative follow-up: group A comprised patients with significant (more than 3 points) postoperative improvement in neurological condition as quantified by the Canadian Neurological Scale (11 patients); group B consisted of patients with minimal improvement or deterioration (nine, three of whom died). All patients were studied preoperatively by99mTc-HMPAO SPET. The volume of nonperfused tissue (VS, cm3) was quantified using the Mountz technique. Hypoperfused volume (V
hypoperf, cm3) in the affected hemisphere was calculated as the total volume of voxels with99mTc-HMPAO uptake <90% of the contralateral symmetric voxels. Discriminant prognostic function was calculated by discriminant analysis as:PF = 0.072×VS + 29.46×(VS/V
hypoperf). Patients with preoperativePF values <8.20 demonstrated postoperative improvement in neurological status, while the group withPF>8.90 comprised patients who demonstrated minimal improvement or deterioration. PF values in the range 8.20–8.90 carried an indefinite prognosis. We conclude that the preoperative99mTc-HMPAO SPET can be used for the selection of patients in whom improvement in neurological status may be expected after urgent surgical correction of acute extracranial obstruction of the ICA. 相似文献
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Neuroimaging in Pineal Tumors 总被引:4,自引:0,他引:4
F Reis MD AV Faria MD PhD VA Zanardi MD PhD JR Menezes MD F Cendes MD PhD LS Queiroz MD PhD 《Journal of neuroimaging》2006,16(1):52-58
BACKGROUND AND PURPOSE: The authors report radiological findings in 11 tumors in the pineal region, which were histologically diagnosed as germinomas, pineocytomas pineoblastomas, ependymomas, teratomas, and astrocytomas. METHODS: Computed tomography (CT) was performed in seven patients and magnetic resonance imaging (MRI) was performed in all patients. RESULTS: CT showed a solid or solid/cystic mass with variable contrast enhancement. MRI showed a heterogeneous mass, with hypointense signal on T1 and iso/hyperintense signal on T2-weighted images (WI) and gadolinium enhancement. Extension to adjacent structures occurred in five patients and spread through the cerebral spinal fluid (CSF) in two. CONCLUSIONS: Pineal region tumors have no pathognomonic imaging pattern. MRI and CT are complementary in diagnosis and are important to determine localization, extension, and meningeal spread. 相似文献
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Myo-inositol transport in the central nervous system 总被引:18,自引:0,他引:18
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M. B. Plotnikov O. E. Vaizova N. I. Suslov 《Bulletin of experimental biology and medicine》1994,118(6):1257-1259
The bioelectrical activity is studied in the left and right parietal cortex by recording the power spectrum of the electroencephalogram
in brain ischemia caused by complete ligation of the left common carotid artery and 50% reduction of the blood flow in the
right common carotid artery in experiments carried out on nonnarcotized Wistar rats. Ischemia results in marked and stable
disorders in the bioelectrical activity manifested in a decrease of the total EEG power, depression of the dominating frequency
in the Θ-range, increase of the δ-range power, and interhemispheric asymmetry of some spectrogram parameters.
Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny Vol. 118, N
o
12, pp. 565–567, December, 1994
Presented by E. D. Gol'dberg, Member of the Russian Academy of Medical Sciences 相似文献
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