Muscle relaxants: suxamethonium and eye surgery: 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 · Muscle relaxants: suxamethonium and eye surgery

Sample item

Which effect of suxamethonium is a concern in a patient with an open globe injury?

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

The answer and the reasoning

C. Rise in intraocular pressure

Suxamethonium raises intraocular pressure by about 5 to 10 mmHg through extraocular muscle contraction, which may extrude intraocular contents. Rocuronium with sugammadex is a useful alternative for rapid sequence induction.

Option by option

  • A. Pupillary dilation

    Pupil size is not significantly affected.

  • B. Fall in intraocular pressure

    IOP does not fall.

  • C. Rise in intraocular pressure (correct)

    Correct. IOP rises transiently.

  • D. Ocular hypotension from hypotension

    Suxamethonium does not produce hypotension.

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 C, Rise in intraocular pressure. Suxamethonium raises intraocular pressure by about 5 to 10 mmHg through extraocular muscle contraction, which may extrude intraocular contents.

Why is "Pupillary dilation" not the answer?

Pupil size is not significantly affected.

Why is "Fall in intraocular pressure" not the answer?

IOP does not fall.

Why is "Ocular hypotension from hypotension" not the answer?

Suxamethonium does not produce hypotension.

What concept does this question test?

It tests Muscle relaxants: suxamethonium and eye surgery in Anaesthesia. Rocuronium with sugammadex is a useful alternative for rapid sequence induction.

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 Muscle relaxants: suxamethonium and eye surgery?

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.