A review of brain signal tests used during asleep tumor surgery
Original title: Cortico-cortical and subcortico-cortical evoked potentials during general anesthesia.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This looks across many earlier studies rather than running a new one.
This is a summary of past studies about a surgery tool, not a new result.
The short version
Doctors can check some important brain pathways during surgery, even when the patient is fully asleep.
What was studied. Researchers looked back at earlier studies of two brain signal tests used during brain surgery under general anesthesia. Fourteen studies were found, and five more were added.
What they found. Thirteen of the studies looked at the language pathway. Four looked at the vision pathway. Fifteen reported the first kind of test, and seven reported the second kind. The review found that both tests can be done while a patient is asleep.
What this means, and what it doesn't
What it could mean: Surgeons try to remove as much tumor as they safely can. These tests may help them check that key brain pathways still work, and warn them when they are getting close to one. The goal is to protect things like speech and sight during surgery.
What it doesn't mean: This is a summary of past studies, not a new treatment. It does not show that these tests lead to better recovery or longer life. It is not a cure and it is not a drug you can ask for. Whether these tests are used depends on the hospital and the surgical team.
Source: PubMed, July 15, 2026 · Read the original
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