Electrocardiogram (ECG) Abnormalities Quiz

Test your knowledge of ECG abnormalities with 17 questions covering ventricular depolarization, PR interval, QRS complex, ST elevation, electrolyte imbalances, myocardial infarction, and more!

#1

Which ECG waveform represents ventricular depolarization?

P wave
QRS complex
T wave
ST segment
#2

What does a prolonged PR interval on an ECG indicate?

Atrial enlargement
Ventricular hypertrophy
Atrioventricular block
Myocardial infarction
#3

Which segment of the ECG corresponds to the time during which both ventricles are depolarized?

PR interval
QRS complex
ST segment
T wave
#4

Which segment of the ECG represents the time from the end of ventricular depolarization to the beginning of repolarization?

PR interval
QRS complex
ST segment
T wave
#5

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

Less than 0.10 seconds
0.12 to 0.20 seconds
Greater than 0.20 seconds
Variable, depending on heart rate
#6

Which of the following is NOT a typical characteristic of a wide QRS complex on an ECG?

Ventricular tachycardia
Bundle branch block
Ventricular ectopy
Sinus rhythm
#7

In a patient with an ST elevation on an ECG, which of the following conditions is most likely?

Atrial fibrillation
Pericarditis
Pulmonary embolism
Aortic stenosis
#8

Which lead is commonly used to diagnose inferior myocardial infarction on an ECG?

Lead I
Lead II
Lead III
Lead aVR
#9

What does the term 'sawtooth pattern' typically refer to in an ECG?

Atrial flutter
Ventricular fibrillation
Atrial fibrillation
Premature atrial contraction
#10

Which ECG lead is typically used to detect myocardial infarction involving the lateral wall of the left ventricle?

Lead I
Lead II
Lead aVL
Lead V1
#11

Which of the following is NOT a common cause of ST segment elevation on an ECG?

Myocardial infarction
Pericarditis
Pulmonary embolism
Hyperkalemia
#12

What does the presence of pathological Q waves on an ECG suggest?

Right bundle branch block
Ventricular hypertrophy
Previous myocardial infarction
Acute pericarditis
#13

Which electrolyte imbalance is most commonly associated with a prolonged QT interval on an ECG?

Hypokalemia
Hypercalcemia
Hyperkalemia
Hypomagnesemia
#14

What is the most common cause of peaked T waves on an ECG?

Hyperkalemia
Hypokalemia
Hypercalcemia
Hypocalcemia
#15

What does the 'delta wave' indicate on an ECG?

Myocardial infarction
Atrial fibrillation
Wolff-Parkinson-White syndrome
Bundle branch block
#16

Which type of cardiac block is characterized by progressive prolongation of the PR interval until a P wave is not conducted?

First-degree AV block
Second-degree AV block, Type I (Wenckebach)
Second-degree AV block, Type II (Mobitz II)
Third-degree AV block (complete heart block)
#17

What is the hallmark characteristic of torsades de pointes on an ECG?

Shortened QT interval
Peaked T waves
Irregularly irregular rhythm
Polymorphic ventricular tachycardia

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