1,720,983 research outputs found
Temporary arterial occlusion in the repair of ruptured intracranial aneurysms: an analysis of risk factors for stroke.
No full textObject. This study was performed to further elucidate technical and patient-specific risk factors for perioperative stroke in patients undergoing temporary arterial occlusion during the surgical repair of their aneurysms. Methods. One hundred twelve consecutive patients in whom temporary arterial occlusion was performed during surgical repair of an aneurysm were retrospectively analyzed. Confounding factors (inadvertent permanent vessel occlusion and retraction injury) were identified in six cases (5%) and these were excluded from further analysis. The demographics for the remaining 106 patients were analyzed with respect to age, neurological status, aneurysm characteristics, intraoperative rupture, duration of temporary occlusion, and number of occlusive episodes; end points considered were outcome at 3-month follow up and symptomatic and radiological stroke. Conclusions. Overall 17% of patients experienced symptomatic stroke and 26% had radiological evidence of stroke attributable to temporary arterial occlusion. A longer duration of clip placement, older patient age, a poor clinical grade (Hunt and Hess Grades IV-V), early surgery, and the use of single prolonged clip placement rather than repeated shorter episodes were associated with a higher risk of stroke based on univariate analysis. Intraoperative aneurysm rupture did not affect stroke risk. On multivariate analysis, only poorer clinical grade (p = 0.001) and increasing age (p = 0.04) were significantly associated with symptomatic stroke risk
Combined transcranial Doppler sonography and rCBF measurements in the early stage of subarachnoid hemorrhage
No full textno abstract availabl
The importance of transcranial doppler sonography in the management of cerebral AVMs: pre-treatment evaluation and post-embolization changes
No full textCombined transcranial Doppler sonography and rCBF measurements in the early stage of subarachnoid hemorrhage.
No full textno abstract availabl
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Ultrasound as a Useful Tool in Hydrocephalus Management During Pregnancy: A Case Report
No full textA 38-year-old pregnant woman in her 24th week of gestation was admitted to our neurosurgical intensive care unit with a 5-cm cerebellar hemangioblastoma and acute hydrocephalus. Initial management included the placement of an external ventricular drain to prevent neurological deterioration. Five days after the initial diagnosis, the patient successfully underwent a neurosurgical intervention to remove the lesion. Transcranial ultrasound was used to determine the optimal ventricular drain level and facilitate weaning, bypassing the need for cerebral computed tomography and cerebral magnetic resonance imaging, which would have otherwise been necessary in postoperative follow-up
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Combined transcranial doppler sonography and rCBF measurements in the early stage of subarachnoid hemorrhage
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