Question:
A patient on verapamil should not be given a beta blocker as?
A patient on verapamil should not be given a beta blocker as?
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Both agents depress the AV node - their additive effect is the danger.
Updated On: Jun 24, 2026
- Conduction block
- Bronchospasm
- Neurogenic shock
- Anaphylaxis
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The Correct Option is A
Solution and Explanation
Step 1: Verapamil is a non-dihydropyridine calcium channel blocker with strong negative chronotropic and dromotropic effects. It slows AV nodal conduction and can accentuate conduction defects.
Step 2: Beta blockers also depress AV nodal conduction and heart rate. Combining the two produces additive suppression of the AV node and sinus node.
Step 3: This combination risks severe bradycardia, AV (conduction) block and even asystole. Verapamil should be avoided in 2nd and 3rd degree block, sick sinus syndrome and together with a beta blocker.
Step 4: Bronchospasm and anaphylaxis are not the concern with this drug pair, and neurogenic shock is unrelated. The correct answer is conduction block.
Step 2: Beta blockers also depress AV nodal conduction and heart rate. Combining the two produces additive suppression of the AV node and sinus node.
Step 3: This combination risks severe bradycardia, AV (conduction) block and even asystole. Verapamil should be avoided in 2nd and 3rd degree block, sick sinus syndrome and together with a beta blocker.
Step 4: Bronchospasm and anaphylaxis are not the concern with this drug pair, and neurogenic shock is unrelated. The correct answer is conduction block.
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