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8 Cards in this Set

  • Front
  • Back
What do Class I anti-arrhythmics block?
Na channels
What do Class IA anti-arrhythmics block?
prolong repolarization (QT interval)
- moderate Na block
What do Class IB anti-arrhythmics block?
shorten repolarization
- weak Na block
What do Class IC anti-arrhythmics block?
little effect on repolarization
- strong Na block
What do Class II anti-arrhythmics block?
What do Class III anti-arrhythmics block?
K channels
What do Class IV anti-arrhythmics block?
Ca channels
what's the risk of class III antiarrhtymic drugs that lengthen repolarization?
increased risk for re-entrant arrhthmias