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  • 1
    ISSN: 0942-0940
    Keywords: Cortical blood flow ; autoregulation index ; intracranial aneurysm ; subarachnoid haemorrhage ; timing of surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Forty-three patients were operated on for ruptured intracranial aneurysms during a 12-month-period. Intraoperative evaluation of cortical blood flow by means of a thermal diffusion probe was performed in 23 out of the 41 patients who were operated on for aneurysms of the anterior circulation. The autoregulation index was determined at the time of raising the systemic blood pressure after clipping of the aneurysm(s). No statistically significant difference was found between the averages of the autoregulation indexes calculated in the subgroups of patients submitted respectively to early or delayed surgery. There was no correlation of both cortical blood flow and autoregulation with either age of the patients, or preoperative neurological grade. On the contrary, the autoregulation index showed a statistically significant correlation with outcome.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0942-0940
    Keywords: Intracranial aneurysm ; subarachnoid haemorrhage ; timing of surgery ; cerebral blood flow ; xenon133 inhalation technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Out of a series of 43 cases operated on for ruptured intracranial aneurysms over a 12-month-period, 32 patients were followed up to 12 months postoperatively with repeated evaluations of cerebral blood flow, using the Xenon133 inhalation technique. No statistically significant differences in cerebral perfusion were detected between the subgroups of good-grade patients, who were submitted respectively to early, or delayed surgery. Depression of flow in the affected hemisphere of poor-grade patients was principally related to the preoperative occurrence of an intracerebral haematoma. The overall results were not consistent with the hypothesis that early surgical intervention results in long-lasting effects on the cerebral circulation.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0942-0940
    Keywords: Cerebral ischaemia ; collateral flow ; omentum to the brain ; STAMCA anastomosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Transposition of lengthened omentum to the brain surface, transplantation of an omental graft, or superficial temporal artery-middle cerebral artery anastomosis were performed in dogs prior to transcranial occlusion of the ipsilateral middle cerebral artery at its origin, including the bifurcation of the internal carotid artery. Both omentum and by-pass were able to reduce the changes in cerebral blood flow, somatosensory evoked responses, cerebral water and electrolyte content, consequent to the ischaemic insult. In the experimental conditions adopted in this study, the effect of omental transposition in maintaining high levels of flow throughout the entire occluded hemisphere was more marked compared to that resulting from the other methods, while the onset of ischaemic cerebral oedema was affected approximately at the same degree by all procedures. The results point to the role of the transposed omentum in providing an effective collateral circulation to the ischaemic brain.
    Type of Medium: Electronic Resource
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