Neuraxial anaesthesia: anticoagulant timing: practice question

A Anaesthesia 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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Anaesthesia · Neuraxial anaesthesia: anticoagulant timing

Sample item

What is the minimum interval between a prophylactic dose of enoxaparin and a neuraxial puncture?

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

The answer and the reasoning

D. 12 hours

ASRA guidelines recommend waiting 12 hours after a prophylactic LMWH dose and 24 hours after a therapeutic dose before neuraxial puncture. Subsequent dosing is at least 12 hours after the puncture.

Option by option

  • A. 48 hours

    48 hours is not standard for prophylactic LMWH.

  • B. 1 hour

    1 hour is too short.

  • C. 4 hours

    4 hours is too short.

  • D. 12 hours (correct)

    Correct. 12 hours for prophylactic LMWH.

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 Anaesthesia question

What is the answer to this Anaesthesia question?

The best answer is D, 12 hours. ASRA guidelines recommend waiting 12 hours after a prophylactic LMWH dose and 24 hours after a therapeutic dose before neuraxial puncture.

Why is "48 hours" not the answer?

48 hours is not standard for prophylactic LMWH.

Why is "1 hour" not the answer?

1 hour is too short.

Why is "4 hours" not the answer?

4 hours is too short.

What concept does this question test?

It tests Neuraxial anaesthesia: anticoagulant timing in Anaesthesia. Subsequent dosing is at least 12 hours after the puncture.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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 Neuraxial anaesthesia: anticoagulant timing?

Make a table of each agent, its key advantage and its main side effect. Then use the flashcards and the other Anaesthesia 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.