Neurosurgery
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Review Comparative Study
Intraoperative chemical hemostasis in neurosurgery.
Of the various electrical, mechanical, and chemical methods used in neurosurgical hemostasis, the chemical methods are the least well understood. In this review, data concerning seven modern chemical hemostatic agents are presented and special emphasis is placed on their neurosurgical applications. ⋯ Several conclusions have been formulated to assist the neurosurgeon in the proper selection and use of these chemical agents. It is our belief that the use of chemical hemostatics in neurosurgery should be based on a thorough knowledge of their mechanism of action and should be supported by continuing laboratory and clinical research.
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Because venous air embolism (VAE) has been considered to be a major deterrent to use of the sitting position, records of 255 patients undergoing neurosurgery in the sitting position from 1975 to 1982 were reviewed to determine the nature of morbidity and mortality in relation to the surgical procedure as well as to the occurrence of VAE. Complications were classified as surgical or anesthetic during joint review by a neurosurgeon and two neuroanesthesiologists. Outcome was classified on the basis of postoperative hospital course and discharge examination. ⋯ Although there was a variety of perioperative complications in patients with and without VAE, most of the complications were related to the operative procedure, not the sitting position or VAE. The episodes of VAE did not seem to be significant factors in the perioperative morbidity and mortality in our series of patients operated upon in the sitting position. Two case reports are discussed in detail.
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Case Reports
Spontaneous migration of a bullet in the spinal subarachnoid space causing delayed radicular symptoms.
The authors report a case of a gunshot wound to the left lower quadrant of the abdomen in a patient who initially was neurologically intact. The bullet had lodged at the T-11, T-12 level in the spinal canal. ⋯ Repeat x-ray films and a myelogram showed that the bullet had migrated to the L-4, L-5 level on the left. Bullet emboli and delayed sequelae of gunshot wounds to the spine are discussed.
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A 77-year-old man presented with a 4-year history of progressive dysphagia to the point that he could no longer swallow solid foods. During the past several months, he had developed dysphonia. ⋯ Evaluation with barium swallow and cervical computed tomography demonstrated esophageal and laryngeal compression. Resection of the anterior osteophytes resolved the dysphagia and dysphonia.
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The effects on cerebral metabolism and the electroencephalogram (EEG) of combining hypocapnia with hypotension have been only incompletely examined. The present study examined the possibility that hypocapnia may worsen the cerebral metabolic and EEG disturbances caused by hypotension. Cerebral metabolism and the EEG were studied at three levels of hypotension during hypocapnia (PaCO2 = 20 mm Hg) in dogs under light halothane anesthesia. ⋯ Cerebral metabolic values were unchanged at a MAP of 60 mm Hg. At MAP less than or equal to 50 mm Hg, power in the beta 1 spectrum, brain tissue phosphocreatine, and the cerebral energy charge all decreased. At a MAP of 40 mm Hg, the cerebral glucose value decreased and the lactate/pyruvate ratio increased.(ABSTRACT TRUNCATED AT 250 WORDS)