ECG Basic Principles Quiz 1

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ECG Basic Principles Quiz 1

Question 1 of 10

1. Question
1. A 6-second ECG strip shows the following:

The heart rate for this rhythm is:
- 1. a. 100 bpm
- 2. b. 155 bpm
- 3. c. 130 bpm
- 4. d. 140 bpm
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Question 2 of 10

2. Question
2. All myocardial cells are capable of being discharged because:
- 1. a. All myocardial cells have a positive intracellular environment that allows sodium to leave the cell membrane via the sodium-potassium ATPase pump to cause an action potential.
- 2. b. All myocardial cells are rich in ATP, and the process of dissociating a phosphate bond to form ADP produces an electrical current that creates an action potential.
- 3. c. All myocardial cells have troponin and myosin capable of producing an electric gradient from the intracellular environment to the extracellular environment in the presence of calcium and ATP.
- 4. d. All myocardial cells are polarized, and since they have more intracellular potassium, this causes them to be more negative than the extracellular environment. Thus, an influx of sodium will cause an action potential.
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Question 3 of 10

3. Question
3. An electrocardiogram shows small Q waves and tall R waves in lead V1 in a patient with a normal heart. The significance of this finding is:
- 1. a. The electrical impulse is measured from the SA downward and toward lead V1 in the right ventricle, making this a normal finding.
- 2. b. Lead V1 should have tall R waves because the electrical impulse from the heart starts from the SA node and travels downward and away from lead V1.
- 3. c. Lead V1 should have small R waves and deep S waves in the normal heart. Therefore, a misplacement of lead V1 should be considered.
- 4. d. Lead V1 should show a downward deflection of the QRS complex because the impulse in the normal heart travels from the AV node toward the SA node. Hence, the impulse generated travels away from lead V1.
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Question 4 of 10

4. Question
4. At times, foci within the heart may fire at a rate faster than the SA node rate and take over as the heart’s pacemaker. This is known as:
- 1. a. Irritability
- 2. b. Escape
- 3. c. Torsades de pointes
- 4. d. Wenckebach phenomenon
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Question 5 of 10

5. Question
5. Atrioventricular blocks present prolonged PR intervals because there is a delay in the conduction of impulses through the AV node. What is the normal PR interval?
- 1. a. 0.06–0.10 seconds
- 2. b. 0.12–0.20 seconds
- 3. c. 0.30–0.44 seconds
- 4. d. 0.40–0.60 seconds
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Question 6 of 10

6. Question
6. How long is a normal QRS interval?
- 1. a. 0.10 seconds
- 2. b. 0.20 seconds
- 3. c. 0.30 seconds
- 4. d. 0.40 seconds
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Question 7 of 10

7. Question
7. The autonomic nervous system regulates the heart rate. Which part of the autonomic nervous system is responsible for increasing the conduction rate of the heart?
- 1. a. Alpha receptors
- 2. b. Beta receptors
- 3. c. Sympathetic branch
- 4. d. Parasympathetic branch
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Question 8 of 10

8. Question
8. The heart’s electrical function is regulated by which one of the following cell structures?
- 1. a. Mitochondria
- 2. b. Endoplasmic reticulum
- 3. c. Golgi bodies
- 4. d. Sodium-potassium channel
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Question 9 of 10

9. Question
9. The normal PR interval is:
- 1. a. 40–120 milliseconds
- 2. b. 80–200 milliseconds
- 3. c. 120–200 milliseconds
- 4. d. 200–300 milliseconds
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Question 10 of 10

10. Question
10. The QRS complex of an ECG tracing spans 4 small squares. What can you conclude from this finding?
- 1. a. The QRS interval is normal.
- 2. b. The QRS interval is too fast.
- 3. c. The QRS interval is too slow.
- 4. d. There is an irregular rhythm.
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