Pharmacologic Management of Chronic Heart Failure and Antiarrhythmic Drugs
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Pharmacologic Management of Chronic Heart Failure and Antiarrhythmic Drugs

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Questions and Answers

What is the main cause of arrhythmias?

  • Enhanced automaticity of cardiac sites other than the SA node (correct)
  • Abnormalities in the ventricles
  • Abnormalities in the AV node
  • Abnormal impulse conduction in the myocardium

    • Which part of the myocardium is responsible for setting the pace of contraction?

  • AV node
  • Ventricles
  • SA node (correct)
  • Atria

    • How do most antiarrhythmic agents suppress automaticity?

  • By blocking potassium (K+) channels
  • By increasing the ratio of sodium (Na+) and calcium (Ca2+) ions
  • By enhancing automaticity of the SA node
  • By blocking sodium (Na+) or calcium (Ca2+) channels (correct)

    • What is the function of the SA node in the myocardium?

    <p>Setting the pace of contraction</p> Signup and view all the answers

    Which ions do antiarrhythmic agents typically block to reduce automaticity?

    <p>Sodium (Na+)</p> Signup and view all the answers

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