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Chapter 9. Arrhythmias

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Where in the heart is the atrioventricular (AV) node located?

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A. High right atrium

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B. Low right atrium

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C. Junction of the atria and ventricles

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D. High right ventricle

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Which phase of the ventricular action potential is most likely to be altered by a sodium channel blocking drug?

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A. Phase 0

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B. Phase 1

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C. Phase 2

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D. Phase 3

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Which one of the following ECG intervals or durations corresponds most closely to phase 3 on the ventricular action potential?

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A. PR interval

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B. QRS complex

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C. QT interval

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D. T wave

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Which one of the following arrhythmias increases the risk of stroke two- to sevenfold?

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A. Atrial fibrillation (AF)

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B. Paroxysmal supraventricular tachycardia (PSVT)

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C. Ventricular premature depolarizations (VPDs)

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D. Ventricular tachycardia (VT)

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Which one of the following most accurately describes the mechanism of AF?

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A. Increased automaticity in the atria, triggering a single atrial reentrant circuit

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B. Increased automaticity in the atria, triggering multiple simultaneous atrial reentrant circuits

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C. Increased automaticity in the pulmonary veins, triggering a single atrial reentrant circuit

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D. Increased automaticity in the pulmonary veins, triggering multiple simultaneous atrial reentrant circuits

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Which one of the following most accurately describes the mechanism of PSVT?

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A. A single reentrant circuit in the atrium

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B. Multiple simultaneous reentrant circuits in the atria

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C. Reentry involving the AV node

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D. Reentry occurring in the ventricles

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Which of the following is the common myocardial pathology associated with hypertension, ischemic heart disease, heart failure, and valve disease that promotes the electrophysiological alterations that result in atrial fibrillation?

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A. Fibrosis of ...

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