Which of the following is a sign evaluated in brain death?

• A. Absence of spontaneous respirations
• B. Presence of spontaneous respirations
• C. Normal reflexes
• D. Heart activity only

Answer: (A)

In brain death, the brainstem’s control of basic life functions is lost, so one essential sign looked for is the absence of spontaneous breathing. If the patient does not initiate breaths on their own, especially during an apnea test where CO2 is allowed to rise without respiratory effort, that demonstrates a loss of brainstem respiratory drive. This is why the absence of spontaneous respirations is the key sign evaluated.

If spontaneous respirations were present, that would indicate some brainstem activity and thus not brain dead. Normal reflexes would imply intact brainstem function, which again contradicts brain death. Heart activity continuing on support can occur even after brain death, but it does not prove that brain function remains.