A New Haven, Conn.-based Yale School of Medicine study published May 11 in Proceedings of the National Academy of Sciences found anesthesia may resemble both sleep and coma states in the brain, challenging the long-held belief that patients under anesthesia are simply in a “deep sleep,” according to a May 15 Hartford Courant report.
Here are five things to know:
- Researchers compared anesthesia to multiple brain states: The study analyzed brain wave recordings from patients under propofol anesthesia and compared them with recordings from people in deep sleep, REM sleep, coma and normal wakefulness using electroencephalography.
- Anesthesia showed similarities to both sleep and coma: Researchers found the anesthetized brain can enter states that resemble sleep and others that more closely resemble coma, depending on the region of the brain being observed.
- Most surgeries do not involve routine brain monitoring: Janna Helfrich, MD, assistant professor of anesthesiology at Yale School of Medicine and lead author of the study, said brain monitoring is still not standard during many surgeries despite anesthesia drugs directly affecting the brain.
- The findings could reshape anesthesia management: Researchers said tailoring anesthesia more precisely could help avoid deeper coma-like brain states during surgery, particularly for older adults and patients with preexisting conditions who may face cognitive complications after procedures.
- Researchers see potential benefits in sleep-like anesthesia states: Future research will focus on guiding anesthetized brains toward more sleep-like patterns, which researchers said could help reduce side effects and support cognitive recovery after surgery.