Journal of anesthesia
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Journal of anesthesia · Apr 2015
Review Meta AnalysisAnesthetic effects of propofol in the healthy human brain: functional imaging evidence.
Functional imaging methods, including positron emission tomography (PET) and functional magnetic resonance imaging (fMRI), have become important tools for studying how anesthetic drugs act in the human brain to induce the state of general anesthesia. Recent imaging studies using fMRI and PET techniques have demonstrated the regional effects of propofol on the brain. However, the pharmacological mechanism of the action of propofol in the intact human central nervous system is unclear. ⋯ During deep sedation, propofol preserves cortical sensory reactivity, the specific thalamocortical network is moderately affected, whereas the nonspecific thalamocortical network is severely suppressed. In contrast, several recent fMRI studies are consistent on the systemic decreased effects of propofol in the frontoparietal network. Accumulating evidence suggest that propofol-induced unconsciousness is associated with a global metabolic and vascular depression in the human brain and especially with a significant reduction in the thalamocortical network and the frontoparietal network.
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Journal of anesthesia · Apr 2015
Review Meta AnalysisAnesthetic effects of propofol in the healthy human brain: functional imaging evidence.
Functional imaging methods, including positron emission tomography (PET) and functional magnetic resonance imaging (fMRI), have become important tools for studying how anesthetic drugs act in the human brain to induce the state of general anesthesia. Recent imaging studies using fMRI and PET techniques have demonstrated the regional effects of propofol on the brain. However, the pharmacological mechanism of the action of propofol in the intact human central nervous system is unclear. ⋯ During deep sedation, propofol preserves cortical sensory reactivity, the specific thalamocortical network is moderately affected, whereas the nonspecific thalamocortical network is severely suppressed. In contrast, several recent fMRI studies are consistent on the systemic decreased effects of propofol in the frontoparietal network. Accumulating evidence suggest that propofol-induced unconsciousness is associated with a global metabolic and vascular depression in the human brain and especially with a significant reduction in the thalamocortical network and the frontoparietal network.
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Journal of anesthesia · Apr 2015
ReviewImplications of recent accumulating knowledge about endothelial glycocalyx on anesthetic management.
The endothelial glycocalyx is a labile, fine structure coating the luminal membrane of intact healthy vascular endothelium. For many decades, no physiologic importance was linked to this structure. It is crucial for vascular barrier function. ⋯ Perioperative damage of the glycocalyx has been demonstrated, and is linked with morbidity and even mortality in surgical patients. Research on the glycocalyx should change many of the current perioperative management guidelines, and focusing on its protection is plausible. The present article reviews what we already know about the glycocalyx and how this knowledge has changed anesthesiologist perspectives.