Journal of neurosurgical anesthesiology
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J Neurosurg Anesthesiol · Jul 2013
Propofol attenuates cerebral ischemia/reperfusion injury partially using heme oxygenase-1.
To investigate the protective effects of propofol in brain ischemia/reperfusion injury and the role of heme oxygenase-1 (HO-1) in this process. ⋯ The neuroprotective effects of propofol postconditioning in brain ischemia/reperfusion injury may be partially through the induction of the HO-1 expression.
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J Neurosurg Anesthesiol · Jul 2013
Review Meta AnalysisAwake craniotomy for brain tumor resection: the rule rather than the exception?
Awake craniotomy (AC) has seen an expanded role in brain tumor surgery over the past few decades. AC allows intraoperative cortical mapping and the continuous assessment of neurophysiological parameters, which are otherwise unattainable under general anesthesia (GA). The ability of AC to analyze eloquent brain areas makes it a powerful method for reducing the risks associated with tumor resection, especially in motor and language cortex. We present a review of the literature to examine the benefits and limits of using AC over GA. ⋯ Given the effectiveness of AC for resection of eloquent tumors, the data suggests an expanded role for AC in brain tumor surgery regardless of tumor location.
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J Neurosurg Anesthesiol · Jul 2013
Clinical validity of cerebral oxygen saturation measured by time-resolved spectroscopy during carotid endarterectomy.
Near-infrared spectroscopy has been used clinically to continuously and noninvasively monitor cerebral oxygen saturation (ScO2). However, there is no gold standard for measuring absolute values of ScO2. Although time-resolved spectroscopy (TRS) is one of the most reliable algorithms that reliably calculate absolute values of ScO2, there are very few clinical studies available. To evaluate the clinical relevance of ScO2 measurements using TRS, we compared ScO2 with jugular venous oxygen saturation (SjO2) during carotid endarterectomy. We also investigated factors associated with cerebral oxygen desaturation during clamping of the carotid artery. ⋯ ScO2 measured by TRS and SjO2 showed narrow limits of agreement. Reduced ScO2 was significantly associated with impaired cerebral hemodynamics.
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Asleep-awake craniotomy presents challenges for the anesthetist who has to provide adequate sedation and analgesia but also requires an awake and cooperative patient for neurological testing. In this setting, we hypothesized that Bispectral Index (BIS) monitoring might be helpful in shortening the patient's awakening and in predicting recovery of consciousness in order to initiate reliable intraoperative brain mapping. ⋯ During asleep-awake craniotomies, higher BIS values at the end of the asleep phase are associated with shorter time to LMA removal, suggesting that BIS monitoring may be beneficial in shortening recovery from anesthesia. During the awake phase, the return of BIS to the preinduction values appeared to indicate full recovery of consciousness, thereby allowing a reliable language testing.