1. Focal ATs are maintained by:
A. The sinus node
B. The ectopic atrial focus
C. The AV node
D. Circus movement
E. Both B and D
2. Focal ATs are usually triggered by a premature atrial contraction. Typically, the morphology of the P wave in the PAC and the P waves in the tachycardia itself are the same. True or False.
3. Paroxysmal atrial tachycardia is another term used to describe this same rapid rhythm caused by an ectopic atrial pacemaker. True or False.
4. Focal ATs account for about _____% of supraventricular tachycardias.
A. 5
B. 5 to 10
C. 5 to 15
D. 15 to 20
5. If the atrial rate is over 230 BPM, the rhythm cannot be caused by an ectopic atrial pacemaker. True or False.
6. At the onset, focal AT can be slightly irregular. True or False.
7. Secondary ST-segment depression can occur in a focal AT. True or False.
8. ST-segment depression is always due to the tachycardia and is not indicative of possible ischemia. True or False.
9. Focal ATs are always benign and never need emergent therapy. True or False.
10. Which of the following circumstances may lead to the formation of a focal AT?
A. Digoxin overdose
B. Myocardial infarction
C. Cardiomyopathies
D. COPD and lung disease
E. All of the above