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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