MCQ Pharmacology Answer 11
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Explanation
class Ib
- shorten action potential
- limited effect on rate of rise of phase 0
- shorten repolarization
- shorten QT
- raise fibrillation threshold
- mild-moderate sodium channel blockade
- little effect on refractoriness since there is essentially no blockade of potassium channels
- eg lignocaine, mexilitine, phenytoin, propafenone
Tags: MCQS, Pharmacology, Anti-Arrythmics
Category: Pharmacology MCQs
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