Which of the following statements is true about brain death ancillary testing?

• A. It can only be confirmed by clinical exam; no tests are needed
• B. It involves tests that may include EEG, cerebral angiography, and nuclear brain scans
• C. It requires only a CT scan
• D. It is diagnosed by normal EEG

Answer: (B)

Ancillary testing in brain death provides objective confirmation when the bedside examination alone isn’t sufficient or feasible. These tests look for either the absence of brain electrical activity or the absence of cerebral blood flow, which together support cessation of all brain function.

Electroencephalography (EEG) assesses brain electrical activity. A finding of electrocerebral inactivity can support a brain death diagnosis, but EEG alone isn’t always definitive because it can be affected by medications, metabolic disturbances, or technical factors.

Cerebral angiography directly visualizes blood flow to the brain. If there is no intracranial circulation, it strongly supports brain death, since no perfusion to brain tissue remains.

Nuclear brain perfusion scans evaluate how well blood reaches and is utilized by brain tissue. Lack of uptake indicates absent cerebral perfusion, aligning with brain death criteria.

CT scans, by contrast, show structure but not functional status, so they’re not used by themselves to confirm brain death. A normal EEG would indicate preserved brain activity, which is incompatible with brain death.

Thus, the statement that ancillary testing may include EEG, cerebral angiography, and nuclear brain scans accurately reflects how brain death is objectively confirmed beyond the clinical exam.