*** https://www.aan.com/Guidelines/Home/GetGuidelineContent/815. This page from the American Academy of Neurology gives an approach for determining brain death.
Determining Brain Death in Adults. This is the same article.
Brain death means the permanent absence of cerebral and brainstem functions. It’s not the same thing as a persistent vegetative state.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2772257/
https://www.uptodate.com/contents/diagnosis-of-brain-death
https://lifeinthefastlane.com/ccc/brain-death-care-organ-donation-patient/