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Once on the ward, you’ll be asked to comment on ECGs regularly, therefore it’s really important to understand how to read an ECG effectively. If you want to learn more about ECGs, you can check out our ECG guides.

Take our ECG quiz to put your knowledge to the test.

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ECG quiz

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Question 1
What view of the heart do leads II, III and aVF represent?
A
Inferior
B
Lateral
C
Anterior
D
Septal
Question 2
What view of the heart do leads I, aVL, V5 and V6 represent?
A
Inferior
B
Lateral
C
Septal
D
Anterior
Question 3
What is often the earliest ECG change seen during myocardial infarction?
A
Tall P-waves
B
ST-depression
C
Tall peaked T-waves
D
ST-elevation
Question 3 Explanation: 
Tall peaked T-waves can suggest a number of abnormalities. If seen in all leads then they usually suggest the individual has hyperkalaemia. However if tall T waves are seen in a particular group of leads it suggests early MI. The tall T waves are due to potassium leaking through the damaged membrane over the infarcted area.
Question 4
What would it suggest if lead I became more positive than lead II and lead III became negative?
A
Left axis deviation
B
Right axis deviation
Question 5
If a rhythm is described as sinus, what does this indicate?
A
A QRS-complex precedes each T-wave
B
P-waves are present
C
QRS-complexes are present
D
A P-wave precedes each QRS-complex
Question 5 Explanation: 
If a rhythm is described as sinus it indicates that a P-wave precedes each QRS-complex. However a rhythm can still be irregular even if it's sinus.
Question 6
If there were 3 large squares in an R-R interval what would the heart rate be?
A
100 bpm
B
90 bpm
C
70 bpm
D
80 bpm
Question 6 Explanation: 
To calculate heart rate from an ECG you count the number of large squares in an R-R interval then divide 300 by this number. Therefore 300/3 = 100 bpm.
Question 7
Which artery is most likely to be affected if ST elevation in present in leads V3 and V4?
A
Right coronary artery
B
Left circumflex coronary artery
C
All of the above
D
Left anterior descending coronary artery
Question 7 Explanation: 
Leads V3 and V4 related to the anterior portion of the heart. Therefore ST elevation in these leads suggests an anterior infarct. The anterior portion of the heart is supplied mainly by the left anterior descending artery therefore this is most likely to have been affected.
Question 8
What is the most common cause of left axis deviation?
A
Left ventricular hypertrophy
B
Atrial septal defects
C
Right ventricular hypertrophy
D
Defects of the conduction system
Question 8 Explanation: 
Left axis deviation is rarely the result of left ventricular hypertrophy and more often due to defects in the conduction system of the heart.
Question 9
What view of the heart do leads V3 & V4 represent?
A
Septal
B
Lateral
C
Anterior
D
Inferior
Question 10
What is the normal duration of a QRS complex?
A
0.16 seconds (4 small squares)
B
0.04 seconds (1 small square)
C
0.12 seconds (3 small squares)
D
0.08 seconds (2 small squares)
Question 10 Explanation: 
In most healthy individuals you would expect QRS complexes to be around 0.12 seconds or slightly less. If a QRS complex lasts longer it is described as a "wide QRS" and can be a sign of inefficient conduction of the ventricles such as bundle branch block.
Question 11
The duration of the PR interval is noted to be increasingly prolonged. In addition QRS complexes appear to be dropped at regular intervals. What diagnosis would this suggest.
A
First degree Heart Block
B
Second degree - Mobitz Type 1 - Heart Block
C
Second degree - Mobitz Type 2 - Heart Block
D
Hyperkalaemia
Question 11 Explanation: 
Second degree - Mobitz Type 1 - Heart Block is a disease of the AV node. It is seen as progressive prolongation of the PR-interval with associated regular dropping of the QRS complex.
Question 12
The absence of P-waves and an irregular rhythm would suggest a diagnosis of...
A
Ventricular tachycardia
B
Atrial fibrillation
C
1st degree heart block
D
2nd degree heart block
Question 12 Explanation: 
In atrial fibrillation the atria no longer conduct electricity from the SA in an orderly fashion. Therefore P-waves are lost. As a result of disordered atrial activity only occasional waves of depolarisation pass through to the AV node and cause ventricular activation. This causes the typical irregular rhythm.
Question 13
If ST-elevation was noted in leads II, III and aVF what would it suggest?
A
A posterior myocardial infarction
B
An inferior myocardial infarction
C
A septal myocardial infarction
D
An anterior myocardial infarction
Question 13 Explanation: 
Leads II, III and aVF all look at the heart in the inferior plane. Therefore ST-elevation in only these leads suggests an inferior myocardial infarction.
Question 14
What does ST-elevation suggest?
A
Bundle Branch Block
B
Heart murmur
C
Heart block - Mobitz type II
D
Myocardial infarction
Question 15
What is the duration of a normal PR-interval?
A
0.04 - 0.12 seconds (1-3 small squares)
B
0.04 - 0.08 seconds (1-2 small squares)
C
0.12 - 0.2 seconds (3-5 small squares)
D
0.08 -0.12 seconds (2-3 small squares)
Question 15 Explanation: 
n normal individuals the PR-interval is between 0.12-0.2 seconds. A PR interval longer than this can suggest the presence of heart block and a short PR-interval can suggest an accessory pathway between the atria & ventricles e.g. WPW syndrome
Question 16
What would it suggest if lead I became negative and lead III became more positive than lead II?
A
Left axis deviation
B
Right axis deviation
Question 17
What is a common cause of right axis deviation?
A
Left ventricular hypertrophy
B
Ventricular septal defect
C
Atrial septal defect
D
Right ventricular hypertrophy
Question 17 Explanation: 
In right ventricular hypertrophy the increased muscle mass of the right ventricle causes increased signal on the ECG. As a result the axis of the heart is shifted to the right with lead III becoming more positive and lead I and II becoming less positive.
Question 18
What view of the heart do leads V1 & V2 represent?
A
Lateral
B
Inferior
C
Anterior
D
Septal
Question 19
A patient is noted to have an abnormally shortened PR-interval on their ECG. Which of the following is the most likely cause?
A
Left bundle branch block
B
Wolf Parkinson White Syndrome
C
AV nodal fibrosis
D
Right bundle branch block
Question 19 Explanation: 
A short PR-interval indicates abnormally short conduction time between the atria and ventricles. This is caused by the presence of an accessory pathway between the atria and ventricles. Wolf parkinson white syndrome is an example of this kind of disorder. In WPW the an accessory pathway known as "the bundle of kent" is present. Most individuals are asymptomatic however there is a risk of sudden death without treatment.
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