Electrocardiography and Lead Placement Quiz

Test your understanding of electrocardiography & lead placement with these quiz questions. Evaluate your ECG interpretation skills now!

#1

Which lead is commonly used as the standard limb lead for monitoring and diagnosing heart conditions?

Lead I
Lead II
Lead III
Lead aVR
1 answered
#2

What is the typical duration of one small square on standard ECG graph paper?

0.04 seconds
0.1 seconds
0.2 seconds
0.5 seconds
#3

Which electrode is used as the ground reference in a standard 12-lead ECG?

Right leg
Left leg
Right arm
Left arm
#4

What is the typical speed at which an ECG paper moves through the machine during recording?

25 mm/s
50 mm/s
75 mm/s
100 mm/s
#5

Which of the following is NOT a potential cause of artifact in an ECG recording?

Muscle tremors
Electrical interference
Incorrect lead placement
Normal sinus rhythm
#6

What does the QRS complex represent in an ECG waveform?

Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
#7

In Einthoven's Triangle, what is the name of the lead that is formed by connecting the right arm and the left arm?

Lead I
Lead II
Lead III
Lead aVL
#8

What does the T wave represent in an ECG waveform?

Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
#9

What does the term 'ST segment elevation' indicate in an ECG?

Hypokalemia
Hyperkalemia
Myocardial infarction
Atrial fibrillation
#10

Which lead in the standard 12-lead ECG is often used to diagnose an acute myocardial infarction involving the lateral wall of the left ventricle?

Lead I
Lead II
Lead V1
Lead V5
#11

Which of the following leads is often referred to as the 'infarct lead' and is useful for detecting inferior myocardial infarctions?

Lead I
Lead II
Lead III
Lead aVF
#12

What does a prolonged PR interval on an ECG suggest?

First-degree heart block
Second-degree heart block
Ventricular fibrillation
Ventricular tachycardia
#13

What does the term 'Torsades de pointes' refer to in the context of ECG findings?

Atrial flutter
Ventricular tachycardia
Ventricular fibrillation
A type of polymorphic ventricular tachycardia
#14

What does the presence of U waves on an ECG indicate?

Atrial fibrillation
Hypokalemia
Myocardial infarction
Atrial flutter
#15

Which arrhythmia is characterized by irregular, chaotic electrical activity on an ECG?

Atrial fibrillation
Ventricular tachycardia
Sinus bradycardia
Supraventricular tachycardia

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