Autonomic: isoprenaline: practice question

A Pharmacology 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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Pharmacology · Autonomic: isoprenaline

Sample item

A patient with complete heart block and recurrent torsades de pointes secondary to bradycardia needs temporary rate support until a pacemaker is available. Which drug is suitable?

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

The answer and the reasoning

C. Isoprenaline infusion

Isoprenaline, a non-selective beta agonist, increases heart rate and conduction and shortens the QT interval by raising the rate, which suppresses pause-dependent torsades. It is a bridge until pacing.

Option by option

  • A. Verapamil

    Verapamil slows AV conduction and would worsen block.

  • B. Phenylephrine

    Phenylephrine causes reflex bradycardia through vasoconstriction.

  • C. Isoprenaline infusion (correct)

    Correct. Beta stimulation increases rate and suppresses pause-dependent torsades.

  • D. Propranolol

    Propranolol would worsen bradycardia and heart block.

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 Pharmacology question

What is the answer to this Pharmacology question?

The best answer is C, Isoprenaline infusion. Isoprenaline, a non-selective beta agonist, increases heart rate and conduction and shortens the QT interval by raising the rate, which suppresses pause-dependent torsades.

Why is "Verapamil" not the answer?

Verapamil slows AV conduction and would worsen block.

Why is "Phenylephrine" not the answer?

Phenylephrine causes reflex bradycardia through vasoconstriction.

Why is "Propranolol" not the answer?

Propranolol would worsen bradycardia and heart block.

What concept does this question test?

It tests Autonomic: isoprenaline in Pharmacology. It is a bridge until pacing.

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 Autonomic: isoprenaline?

Learn drugs as classes, then the exception in each class that an examiner would pick. Then use the flashcards and the other Pharmacology 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.