The consensus practice guideline on brain death, also known as death by neurologic criteria (BD/DNC), was developed by a panel of 20 experts from different specialties, institutions, and medical societies.
As with previous guidelines, the updated version stipulates that brain death should be declared when a patient with a known cause of catastrophic brain injury has permanent loss of function of the brain, including the brain stem, which results in coma, brain stem areflexia, and apnea in the setting of an adequate stimulus.
But the updated version also clarifies questions on neurological examinations and apnea testing and offers new guidance on pre-evaluation targets for blood pressure and body temperature and evaluating brain death in patients who are pregnant, are on extracorporeal membrane oxygenation, or have an injury to the base of the brain.
Also, for the first time, the guidance clarifies that clinicians don’t need to obtain consent before performing a brain death evaluation, unless institutional policy, state laws, or regulations stipulate otherwise.
“The 2023 guidelines will be considered the standard of care in the U.S.,” lead author David M. Greer, MD, chair and chief of neurology, Boston University, and chief of neurology, Boston Medical Center, said in an interview. “Each hospital in the U.S. is responsible for its own policy for BD/DNC determination, and our hope is that they will quickly revise their policies in accordance with this new national standard.”
The guidelines, which are accompanied by a three-page checklist and a free digital app, were published online in Neurology.
Four years in the making
Work on the 85 recommendations in the new report began more than 4 years ago as a collaborative effort by the American Academy of Neurology, the American Academy of Pediatrics, the Child Neurology Society, and the Society of Critical Care Medicine.
A lack of high-quality evidence on brain death determination led panelists to devise an evidence-informed formal consensus process to develop the guidelines, which involved three rounds of anonymous voting on each recommendation and the rationales behind them.
The strength of each recommendation was based on the level of consensus reached through voting, with Level A denoting a recommendation that “must” be followed, Level B one that “should” be followed, and Level C one that “may” be followed.
The majority of recommendations received an A or B rating. Only one recommendation, about whether a second clinical exam is needed in adults, garnered a C rating.
In children, the guidelines recommend that clinicians must perform two clinical examinations and two apnea tests 12 hours apart. In adults, only one exam is required. Both of those recommendations were rated Level A. A recommendation for a second exam in adults received the single Level C rating.
A uniform set of guidelines?
The new guidelines replace adult practice guidance published by AAN in 2010 and guideline for infants and children released in 2011 by AAP, CNS, and SCCM, and for the first time combine brain death guidelines for adult and pediatric patients into one document.