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Overview of ECG basics

Overview of ECG basics

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Question 1 of 20

1. Question

Within the Ambulance setting, how many electrodes are used in a standard 3-lead ECG?

4
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3
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6
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5
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Question 2 of 20

2. Question

Which electrode acts as the neutral ground in a 3-lead ECG setup?

Right leg
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Left arm
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Right arm
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Left leg
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Question 3 of 20

3. Question

What does the vertical axis on ECG paper represent?

Voltage
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Heart rate
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Time
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Amplitude
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Question 4 of 20

4. Question

How long does one small square represent on the horizontal axis?

0.04 seconds
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0.2 seconds
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1 second
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0.1 seconds
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Question 5 of 20

5. Question

What is the normal range for the PR interval?

0.12–0.2 seconds
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0.04–0.1 seconds
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0.2–0.3 seconds
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0.06–0.12 seconds
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Question 6 of 20

6. Question

What waveform corresponds to ventricular depolarisation?

QRS complex
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T wave
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P wave
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ST segment
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Question 7 of 20

7. Question

Where should the V4 chest lead be placed?

5th intercostal space, mid-clavicular line
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4th intercostal space, mid-clavicular line
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5th intercostal space, anterior axillary line
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Between V2 and V4
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Question 8 of 20

8. Question

What is a typical feature of normal sinus rhythm?

P wave precedes each QRS complex
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QRS precedes the P wave
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T wave precedes the QRS complex
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Inverted P waves in lead I
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Question 9 of 20

9. Question

Which lead should show a positive QRS in normal axis?

Lead I
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aVR
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Lead III
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V1
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Question 10 of 20

10. Question

What does the isoelectric line represent?

No net electrical activity
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Maximum depolarisation
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Heart rate
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Repolarisation peak
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Question 11 of 20

11. Question

Which method is best for calculating heart rate in irregular rhythms?

10-second strip method
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Large square method
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Small square method
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QRS count method
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Question 12 of 20

12. Question

What can the RR interval be used for?

Calculating heart rate
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Measuring ST elevation
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Identifying P waves
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Assessing axis deviation
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Question 13 of 20

13. Question

A QRS duration greater than 0.12 seconds suggests?

Abnormal conduction
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Normal sinus rhythm
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Electrode misplacement
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Low voltage
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Question 14 of 20

14. Question

Which ECG feature increases in amplitude from V1 to V4?

R wave
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P wave
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T wave
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S wave
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Question 15 of 20

15. Question

What does right axis deviation indicate?

Possible right ventricular hypertrophy
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Normal finding
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Sinus arrhythmia
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Left atrial enlargement
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Question 16 of 20

16. Question

Which lead typically shows a negative deflection in normal sinus rhythm?

aVR
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II
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I
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aVF
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Question 17 of 20

17. Question

Artefact on an ECG can be caused by several factors. Which of the following below would cause artefact and is not a physiological finding?

Muscle tremors
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Bradycardia
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Atrial flutter
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Tall R waves
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Question 18 of 20

18. Question

The J point marks?

End of QRS, start of ST segment
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Start of P wave
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Start of T wave
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End of PR interval
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Question 19 of 20

19. Question

Which component is used in axis calculation?

QRS complex
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PR segment
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P wave
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T wave
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Question 20 of 20

20. Question

Which electrode should be placed in the 4th intercostal space, right of the sternum?

V1
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V2
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V4
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V6
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