Neurosurgery
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The current literature reports many measurements (arteriovenous oxygen content difference and cerebral metabolic rate of oxygen, etc.) with samples from the internal jugular veins (IJs), obtained from either side of the neck, based on the assumption that a reliable sample of mixed venous blood can be drawn. We compared oxygen saturation in both IJs in 32 patients with head injuries to establish the similarities or discrepancies in the two veins. Both IJs were cannulated with 20-G catheters; in five patients, a fiberoptic catheter was used to obtain a continuous recording of the hemoglobin saturation. ⋯ Ultimately, only eight patients had differences of less than 5%. No relationship was found among the computed tomographic scan data and the pattern of hemoglobin saturation detected. Therefore, we were not able to identify the side more appropriate for monitoring in patients with bilateral, predominantly monolateral, cortical, or deeply located lesions.(ABSTRACT TRUNCATED AT 250 WORDS)
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The decision-making process whereby treatment is offered to a patient with an arteriovenous malformation (AVM) must be supported by an understanding of the risks related to the natural history of the AVM and the risks related to the treatment of that particular AVM. The ability to estimate the treatment risk for an individual patient is hampered by the marked variability in the complexity of AVMs. In 1986, an AVM grading system was proposed to predict surgical morbidity and mortality. ⋯ The AVM grading system accurately correlated with both new-temporary (P < 0.0001) and new-permanent (P = 0.008) neurological deficits. The permanent major neurological morbidity rates for Grades I through III were 0%, increasing to 21.9% in patients with Grade IV and 16.7% in patients with Grade V AVMs (P < 0.0001). One patient with a Grade III AVM died from an esophageal hemorrhage 15 months after her AVM was treated.(ABSTRACT TRUNCATED AT 250 WORDS)
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Temporary occlusion of intracranial arteries has emerged as a valuable technical adjunct in the management of intracranial aneurysms. The current study considered 121 patients (from a group of 234 consecutive aneurysm patients treated during a 2-yr period) who underwent elective temporary arterial occlusion. Twenty-one patients were excluded from further study because of an intraoperative rupture of an aneurysm, the elective sacrifice of afferent or efferent vessels, or the performance of an extracranial-intracranial arterial bypass graft; the remaining 100 patients underwent elective temporary occlusion under a standard neuroanesthetic regimen, including etomidate-induced burst suppression, normotension, normovolemia, and normothermia. ⋯ Patients more than 61 years of age and those in poor neurological condition (Hunt and Hess Grades III to IV) did not tolerate temporary occlusion as well as patients who were younger and in better condition. Patients occluded for less than 14 minutes routinely tolerated the iatrogenic ischemia; the 95% confidence level for the toleration of occlusion without the development of infarction occurred at 19 minutes. All patients occluded for more than 31 minutes had both clinical and radiographic evidence of cerebral infarction.(ABSTRACT TRUNCATED AT 250 WORDS)
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Historical Article
The development of neurological surgery at Cook County Hospital.
The development of neurosurgery in Chicago has rather unique beginnings. The key contributions by well-known general surgeon demonstrators who worked at Chicago's Cook County Hospital in the late 1800s and early 1900s are highlighted. The formation of neurosurgical academic programs and educational development in Chicago is detailed further and placed in perspective.
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Review Case Reports
Iatrogenic cerebrospinal fluid fistula to the pleural cavity: case report and literature review.
The authors observed one case of an iatrogenic subarachnoid-pleural fistula secondary to the resection of an upper lobe carcinoma of the lung. The clinical presentation was characterized by a sudden deterioration of mental status and level of consciousness immediately after the removal of the thoracotomy chest tube. The diagnosis was substantiated by the demonstration of pneumocephalus by a computed tomographic scan of the head and by the identification of a left T5 nerve root fistula by a postmyelographic computed tomographic scan. ⋯ Operative treatment consisted of the suture ligature of the nerve root and a chest drain. The postoperative course was uneventful, and the outcome was excellent, with the only finding of sensory loss in the T5 nerve root territory. A review of the literature disclosed 11 similar cases, with some differences in the choice of the most appropriate diagnostic procedure and significant differences in the therapeutic options, which were related to the various mechanisms of injury.