Electrocardiogram (ECG) Interpretation Quiz

Test your understanding of ECG interpretation with these questions covering atrial depolarization, QRS complex, PR interval, lead placement, and more.

#1

Which wave represents atrial depolarization in an ECG?

P wave
QRS complex
T wave
U wave
1 answered
#2

What does the QRS complex represent in an ECG?

Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
1 answered
#3

What is the typical duration of a normal PR interval on an ECG?

Less than 0.08 seconds
0.08 to 0.12 seconds
0.12 to 0.20 seconds
More than 0.20 seconds
1 answered
#4

Which component of the ECG corresponds to ventricular repolarization?

P wave
QRS complex
T wave
U wave
1 answered
#5

What is the expected duration of a normal QT interval on an ECG?

Less than 0.32 seconds
0.32 to 0.40 seconds
0.40 to 0.46 seconds
More than 0.46 seconds
1 answered
#6

What term describes a pattern of irregular, chaotic electrical activity on an ECG?

Ventricular tachycardia
Atrial fibrillation
Supraventricular tachycardia
Atrial flutter
1 answered
#7

Which wave represents ventricular repolarization in an ECG?

P wave
QRS complex
T wave
U wave
1 answered
#8

What does a prolonged PR interval indicate in an ECG?

Atrioventricular block
Ventricular hypertrophy
Myocardial infarction
Supraventricular tachycardia
1 answered
#9

Which lead is considered the standard for monitoring ECG in most cases?

Lead I
Lead II
Lead III
Lead aVR
1 answered
#10

Which electrode placement is used for Lead V1 in a standard 12-lead ECG?

Fourth intercostal space, right sternal border
Fourth intercostal space, left sternal border
Fifth intercostal space, midclavicular line
Fifth intercostal space, left midaxillary line
1 answered
#11

Which lead in a standard 12-lead ECG is often used to detect inferior myocardial infarction?

Lead I
Lead II
Lead III
Lead aVF
1 answered
#12

What does a wide QRS complex suggest in an ECG?

Ventricular tachycardia
Atrial fibrillation
Sinus bradycardia
Supraventricular tachycardia
1 answered
#13

Which electrolyte imbalance is associated with the characteristic 'U wave' observed on an ECG?

Hypokalemia
Hyperkalemia
Hyponatremia
Hypernatremia
1 answered
#14

What does a negative T wave indicate on an ECG?

Hyperkalemia
Hypokalemia
Hypercalcemia
Hypocalcemia
1 answered
#15

What does ST segment elevation typically indicate on an ECG?

Myocardial infarction
Ventricular hypertrophy
Atrial fibrillation
Pericarditis
1 answered
#16

In which condition would you expect to see a 'delta wave' on an ECG?

Wolff-Parkinson-White syndrome
Hypertrophic cardiomyopathy
Atrial fibrillation
Ventricular tachycardia
1 answered
#17

What term describes the phenomenon when a P wave is absent and the QRS complex is not preceded by it on an ECG?

Atrial fibrillation
Atrial flutter
Atrial tachycardia
Atrial standstill
1 answered
#18

What does a 'notched' QRS complex suggest in an ECG?

Wolff-Parkinson-White syndrome
Atrial fibrillation
Myocardial infarction
Atrioventricular block
1 answered
#19

What does a 'sawtooth' pattern of atrial activity indicate on an ECG?

Atrial fibrillation
Atrial flutter
Atrial tachycardia
Atrial standstill
1 answered
#20

What does a prolonged QT interval on an ECG suggest?

Ventricular hypertrophy
Wolff-Parkinson-White syndrome
Risk of ventricular arrhythmias
Atrial fibrillation
1 answered
#21

What does a 'delta wave' represent on an ECG tracing?

Pre-excitation of the ventricles
Atrial fibrillation
Myocardial infarction
Ventricular hypertrophy
1 answered

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