1. AVRT is caused by a macroreentry circuit involving the __________ and a(n) _________ _________.
2. A good way to visualize an accessory pathway is to think of it like a “backdoor” to the ventricles. True or False.
3. Accessory pathways have their own intrinsic:
A. Pacemaking rates
B. Conduction rates
C. Physiologic block
D. Refractory periods
E. Both B and D are correct.
4. The delta wave refers to the slurred onset of the QRS, which is created when the atrial depolarization wave travels unimpeded through the accessory pathway, causing a slow, localized cell-to-cell ventricular depolarization wave to develop. True or False.
5. In the macroreentry circuit formed in AVRT, the slow pathway is created by:
A. The AV node
B. An accessory pathway
C. Rapid ventricular depolarization
D. Cell-to-cell ventricular depolarization
6. In the macroreentry circuit formed in AVRT, the fast pathway is created by:
A. The AV node
B. An accessory pathway
C. Rapid ventricular depolarization
D. Cell-to-cell ventricular depolarization
7. The WPW pattern consists of:
A. A delta wave
B. A short PR interval
C. A QRS wider than or equal to 0.12 seconds
D. Nonspecific ST-T wave changes
E. All of the above
8. The WPW pattern and WPW syndrome refer to the same thing. True or False.
9. If an accessory pathway is present but it is electrocardiographically silent, it is referred to as a(n) _________ _________ pathway.
10. A reentrant tachycardia that is formed when an impulse travels down the AV node and reenters the atria through the accessory pathway is called a(n) ________ AVRT.
11. A reentrant tachycardia that is formed when an impulse travels down the accessory pathway and reenters the atria through the AV node is called a(n) ________ AVRT.
12. Orthodromic AVRT is a narrow-complex tachycardia. The rate is somewhat under the control of the AV node due to the presence of the physiologic block, which is still active in these cases. True or False.
13. Antidromic AVRT is a wide-complex tachycardia. The rate is not under the control of the AV node. True or False.
14. The inverted P wave in AVRT is found immediately before, during, or immediately after the QRS complex. True or False.
15. The chance that a tachycardia involves an accessory pathway is very high if the ventricular rate exceeds 250 BPM. True or False.