Normal ECG Variants Quiz

1. A group of rhythms originating outside of the sinoatrial node but still within the conduction system that represents an IRRITABILITY in the conduction system is known as which of the following arrhythmias? 

2. An ECG tracing represents a heart rate of 48 bpm, regular R-R interval, an upward deflection of the P wave, an R-R interval of 0.12 seconds, and a QRS complex < 0.12 seconds. What ECG pattern does this describe? 

3. Patients with a junctional rhythm have junctional P waves that may occur in which segment of the ECG tracing? 

4. When analyzing a patient’s ECG, you notice a deep Q wave in frontal lead II and inverted T wave morphology in frontal lead III. What can you conclude?

5. Which characteristic of a premature ventricular contraction is caused by a refractory state of the T wave of the core rhythm when an irritable ventricular focus causes a strong ventricular depolarization?

6. Which one of the following ECG examples is likely a pathologic Q wave?

7. Which one of the following frontal leads may have nonpathologic or normal variant deep Q waves? 

8. While measuring the PR interval, you notice that not all P waves are conducted throughout the long lead ECG tracing. What is the most probable conclusion?