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Chapter 9. Arrhythmias

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

A. High right atrium

B. Low right atrium

C. Junction of the atria and ventricles

D. High right ventricle

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

A. Phase 0

B. Phase 1

C. Phase 2

D. Phase 3

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

A. PR interval

B. QRS complex

C. QT interval

D. T wave

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

A. Atrial fibrillation (AF)

B. Paroxysmal supraventricular tachycardia (PSVT)

C. Ventricular premature depolarizations (VPDs)

D. Ventricular tachycardia (VT)

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

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

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

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

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

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

A. A single reentrant circuit in the atrium

B. Multiple simultaneous reentrant circuits in the atria

C. Reentry involving the AV node

D. Reentry occurring in the ventricles

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?

A. Fibrosis of ...

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