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Clinical Trial Summary

This study's purpose is to see if mental functions take place during different levels of anesthesia, using a commonly used drug (Propofol). fMRI (functional Magnetic Resonance Imaging, or "brain imaging") shows areas in the brain involved in thinking at different depths of anesthesia.


Clinical Trial Description

Administering anesthetic drugs to suppress consciousness is an imperatively important step in major surgical operations. Yet the neurobiological mechanisms that underlie loss of consciousness under general anesthesia remain elusive. Despite advancements in understanding the molecular, synaptic, and cellular effects of anesthetics, the large-scale, systems-level modulation of neuronal processes that support conscious cognitive functions is incompletely understood. While profound decreases in global and regional brain metabolism, blood flow, and functional connectivity have been reported, these changes often fail to correlate with the loss and return of consciousness. To date, there is no "consciousness meter" or "gold standard" to objectively assess and monitor the level of consciousness under general anesthesia. Several studies suggest that residual cognitive functions may not completely vanish under general anesthesia; however, the level and complexity of residual information processing in the anesthetized brain remains unknown. Finally, the neurobiological mechanisms that govern anesthesia induction and emergence appear to be partially different, but the relevance of these differences to the modulation of the state of consciousness is unclear. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT03361605
Study type Interventional
Source University of Michigan
Contact
Status Enrolling by invitation
Phase Phase 4
Start date April 12, 2017
Completion date December 31, 2020

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