Journal of neurosurgical anesthesiology
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J Neurosurg Anesthesiol · Oct 2016
Sevoflurane Impairs Growth Cone Motility in Dissociated Murine Neurons.
Early postnatal exposure to general anesthetic agents causes a lasting impairment in learning and memory in animal models. One hypothesis to explain this finding is that exposure to anesthetic agents during critical points in neural development disrupts the formation of brain circuitry. Here, we explore the effects of sevoflurane on the neuronal growth cone, a specialization at the growing end of axons and dendrites that is responsible for the targeted growth that underlies connectivity between neurons. ⋯ Sevoflurane interferes with growth cone motility, which is a critical process in brain circuitry formation. Our data suggest that this may occur through an action on the p75NTR, which promotes growth inhibitory signaling by the Rho pathway.
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J Neurosurg Anesthesiol · Oct 2016
Noninvasive Measurement of Cerebral Blood Flow Under Anesthesia Using Arterial Spin Labeling MRI: A Pilot Study.
Cerebral ischemia plays a major role in pathophysiology of the injured brain. Most of the currently available methods of cerebral blood flow (CBF) monitors are either indirect measure of CBF or needing radioactive agents for data acquisition. Arterial spin labeling magnetic resonance imaging (ASL-MRI) is a noninvasive method of measuring CBF. The aim of our study was to determine the differences in the CBF values between propofol and sevoflurane anesthesia using ASL-MRI technique in mechanically ventilated patients with cerebrovascular disease. ⋯ ASL-MRI is a feasible, noninvasive method of quantitative estimation of global and regional CBF in mechanically ventilated patients under anesthesia. In this pilot study CBF was consistently greater with sevoflurane than with propofol.
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J Neurosurg Anesthesiol · Oct 2016
Randomized Controlled TrialThe Effects of Dexmedetomidine and Remifentanil on Hemodynamic Stability and Analgesic Requirement After Craniotomy: A Randomized Controlled Trial.
Anesthesia for craniotomies should blunt responses to noxious stimuli, whereas subsequently leaving patients sufficiently alert for early neurological evaluation. The aim was to compare postoperative blood pressure control, pain, and opioid requirement after anesthesia with dexmedetomidine versus remifentanil. We therefore tested 2 primary hypotheses: (1) intraoperative administration of dexmedetomidine provides better control of postoperative blood pressure than remifentanil; and (2) patients given dexmedetomidine have less postoperative pain and use less opioid. ⋯ Intraoperative dexmedetomidine better controlled postoperative MAP and provided superior analgesia in patients undergoing craniotomy.