Health
Brain structure can predict a person’s predisposition to accidental consciousness under anesthesia
Neuroscientists at Trinity College Dublin have identified for the first time a brain structure that can predict an individual’s predisposition to accidental consciousness under anesthesia.
Findings just published in the journal mapping the human brain, Helps identify individuals who may need more anesthetic than average.
Although anesthesia has been used in clinical medicine for over 150 years, scientists do not fully understand why anesthesia affects humans in such a wide variety of ways. It is possible that one in four patients who are estimated to be unconscious during general anesthesia may actually have subjective experiences such as dreams, and in very rare cases (0.05–0.2%). ), which an individual may inadvertently become aware of during a medical procedure.
The study found that one in three participants had response time unaffected by moderate propofol sedation, thus thwarting an important goal of anesthesia. Inhibition of behavioral responses.
The study also showed for the first time that participants who resisted anesthesia had fundamental differences in the function and structure of the frontoparietal regions of the brain from those who remained completely unconscious. Importantly, these brain differences were predictable before sedation.
Lorina Naci, associate professor of psychology at Trinity, who led the study, said:
“Detecting a person’s responsiveness to anesthesia prior to sedation has important implications for patient safety and health. Our results highlight new markers for improved monitoring of consciousness during clinical anesthesia.” Although rare, accidental awareness during surgery can be highly traumatic and lead to long-term complications such as post-traumatic stress disorder and clinical depression and phobias. It has detrimental effects on health.”
“Our results show that individuals with greater gray mass in frontal lobe regions and stronger functional connectivity within the fronto-parietal brain network are less responsive than those with weaker connectivity and less gray mass in these regions. suggest that high doses of propofol may be required for
This study, conducted in Ireland and Canada, examined 17 healthy individuals sedated with propofol, the most common clinical anesthetic. Participants’ response times to detect simple sounds were measured when they were awake and when they were sedated. Brain activity was also measured in her 25 participants when listening to simple stories in both states.
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Journal reference:
Den, F., and others. (2023) variability in reactivity during anesthesia is related to intrinsic differences in brain structure and function of frontoparietal networks. Mapping the human brain. doi.org/10.1002/hbm.26199.
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