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Questions and Answers
What is the main cause of arrhythmias?
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?
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?
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?
What is the function of the SA node in the myocardium?
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Which ions do antiarrhythmic agents typically block to reduce automaticity?
Which ions do antiarrhythmic agents typically block to reduce automaticity?
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