Thanatology: spinal reflexes in brain death: practice question

A Forensic Medicine question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Forensic Medicine · Thanatology: spinal reflexes in brain death

Sample item

A ventilated patient is being assessed for brain stem death. The patient has absent pupillary and corneal reflexes and no spontaneous breathing, but the knee jerk can be elicited. How should this finding be interpreted?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. Spinal reflexes can persist and do not exclude brain stem death

Spinal reflex arcs lie below the brain stem and can persist, sometimes with limb movements, after brain stem death. Their presence does not exclude the diagnosis. The determination rests on absent brain stem reflexes and apnoea, with confounders such as drugs and hypothermia excluded.

Option by option

  • A. Spinal reflexes can persist and do not exclude brain stem death (correct)

    Correct. Spinal reflexes are independent of the brain stem.

  • B. Brain stem death is ruled out

    Spinal reflexes do not rule out brain stem death.

  • C. The patient is in a persistent vegetative state

    A vegetative state has preserved brain stem function, including breathing, so it is a different condition.

  • D. The tests must be abandoned and repeated after three days

    There is no requirement to wait three days because of a spinal reflex.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Forensic Medicine question

What is the answer to this Forensic Medicine question?

The best answer is A, Spinal reflexes can persist and do not exclude brain stem death. Spinal reflex arcs lie below the brain stem and can persist, sometimes with limb movements, after brain stem death.

Why is "Brain stem death is ruled out" not the answer?

Spinal reflexes do not rule out brain stem death.

Why is "The patient is in a persistent vegetative state" not the answer?

A vegetative state has preserved brain stem function, including breathing, so it is a different condition.

Why is "The tests must be abandoned and repeated after three days" not the answer?

There is no requirement to wait three days because of a spinal reflex.

What concept does this question test?

It tests Thanatology: spinal reflexes in brain death in Forensic Medicine. Their presence does not exclude the diagnosis. The determination rests on absent brain stem reflexes and apnoea, with confounders such as drugs and hypothermia excluded.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Thanatology: spinal reflexes in brain death?

Learn postmortem changes with their timelines, and toxicology as poison, sign, test and antidote. Then use the flashcards and the other Forensic Medicine questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.