AJNR. American journal of neuroradiology
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AJNR Am J Neuroradiol · Jun 2004
Reversible MR changes in the cat brain after cerebral fat embolism induced by triolein emulsion.
Clinical cerebral-fat embolism shows both reversible and irreversible changes. We used MR imaging to investigate the reversibility of embolized lesions induced with a fat-emulsion technique and to evaluate the histologic findings. ⋯ Cerebral-fat embolism induced by a triolein emulsion revealed reversible MR findings and minimal histologic findings.
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AJNR Am J Neuroradiol · Jun 2004
Distal-tip shape-consistency testing of steam-shaped microcatheters suitable for cerebral aneurysm coil placement.
Although the selection of microcatheter for endovascular aneurysmal treatment is one important factor in patient outcome, the use of steam shaping for achieving safe entry and stability during coil placement has not, to our knowledge, been systematically evaluated. The goal of this study was to compare the durability of distal microcatheter steam shaping in five different catheters with typical intraprocedural stresses that are similar to those encountered during aneurysm coil placement. ⋯ Our study shows that, although braided microcatheters are suitable for maintaining durable configurations when long distal-tip lengths are permissible, nonbraided microcatheters demonstrate the most durable distal-tip configurations when short distal-tip lengths are called for. This may be one of significant factors in catheter choice for endovascular treatment of aneurysm.
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AJNR Am J Neuroradiol · Jun 2004
Intra-arterial nimodipine for the treatment of symptomatic cerebral vasospasm after aneurysmal subarachnoid hemorrhage: preliminary results.
Cerebral vasospasm remains a major problem in patients recovering from aneurysmal subarachnoid hemorrhage despite advances in medical, surgical, and endovascular care. Our purpose was to assess the efficacy of intra-arterial nimodipine, a calcium-channel blocker acting mainly on cerebral vessels, in preventing delayed neurologic deficits in patients with symptomatic vasospasm. ⋯ Intra-arterial nimodipine is effective and safe for the treatment of symptomatic vasospasm after subarachnoid hemorrhage. Further prospective randomized studies of cerebral blood flow are needed to confirm these results.
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When the fellowship match for trainees entering neuroradiology programs was first proposed in 2001, the program directors in neuroradiology agreed to a 3-year trial utilizing the National Residency Match Program (NRMP) for selecting fellows. A decision as to whether to continue with the neuroradiology fellowship match was to be assessed at the 3-year mark in 2004. ⋯ Support for continuing a match system for selecting fellows remains high (85%) among neuroradiology program directors. The system is considered fair and does not harm many programs. The recruitment of fellows to neuroradiology via the match has increased over the 3 years of its existence.
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AJNR Am J Neuroradiol · May 2004
Volumetric proton spectroscopic imaging of mild traumatic brain injury.
Poor clinical outcomes without notable neuroimaging findings after mild traumatic brain injury (MTBI) suggest diffuse tissue damage and altered metabolism not observable with conventional MR imaging and CT. In this study, MTBI-associated metabolic changes were assessed over the entire brain by using volumetric proton MR spectroscopic imaging (MRSI) and the findings related to injury and outcome assessments. ⋯ These results show evidence of widespread metabolic changes following MTBI in regions that appear normal on diagnostic MR images. Although the association with injury assessment and outcome is weak, this preliminary study demonstrates the applicability of volumetric proton MRSI for evaluating diffuse injury associated with MTBI.