Cardiac-Vascular Nursing Exam Prep II

Category - AACN Cardiac Vascular Nursing Practice Test

Which of the following anti-dysrhythmic class of drugs is not correctly matched with its mechanism of action?
  1. Class II - Potassium channel openers
  2. Class I - Inhibition of sodium channels
  3. Class III - Inhibition of potassium efflux
  4. Class IV - Calcium channel blockers
Explanation
Answer- A - Class II - Potassium channel openers is not a correct match. Class I anti-dysrhythmic agents inhibit sodium channels. Class II drugs include beta-adrenergic receptor antagonists, which slow heart rate and increase cardiac muscle contraction. Class III drugs inhibit potassium efflux during repolarization. Class IV agents include calcium channel blocker. Unclassified agents such as digoxin decrease conduction velocity and adenosine activates adenosine receptors that play a role in potassium conductance.
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