Cardiac Dysrhythmias and Electrocardiography Quiz

Test your knowledge on electrophysiology with questions on ECG components, dysrhythmias, lead placements, and more.

#1

Which component of the electrocardiogram (ECG/EKG) represents atrial depolarization?

P wave
QRS complex
T wave
PR interval
#2

Which cardiac dysrhythmia is characterized by chaotic, irregular electrical activity in the atria?

Atrial fibrillation
Atrial flutter
Ventricular fibrillation
Ventricular tachycardia
#3

What is the term for an abnormally fast heart rhythm originating from the ventricles?

Atrial fibrillation
Ventricular tachycardia
Supraventricular tachycardia
Atrial flutter
#4

Which segment of the ECG represents ventricular depolarization?

P wave
PR interval
QRS complex
T wave
#5

Which interval on an ECG represents ventricular repolarization?

PR interval
QT interval
QRS complex
ST segment
#6

What is the normal duration range for the PR interval on an ECG?

0.04 - 0.10 seconds
0.10 - 0.20 seconds
0.20 - 0.30 seconds
0.30 - 0.40 seconds
#7

Which ECG lead placement is commonly used to detect myocardial infarctions involving the inferior wall of the heart?

Lead I
Lead II
Lead III
Lead aVR
#8

Which ECG finding is characteristic of hyperkalemia?

Peaked T waves
Prolonged PR interval
Shortened QT interval
Wide QRS complex
#9

What is the term for a prolonged QT interval that predisposes individuals to ventricular arrhythmias?

Brugada syndrome
Long QT syndrome
Wolff-Parkinson-White syndrome
Sick sinus syndrome
#10

What is the typical heart rate range in sinus bradycardia?

Less than 60 bpm
60 - 100 bpm
100 - 150 bpm
More than 150 bpm
#11

Which ECG lead placement is commonly used to assess for myocardial infarctions involving the lateral wall of the heart?

Lead I
Lead II
Lead III
Lead V5
#12

Which electrolyte abnormality can cause a prolonged QT interval on an ECG?

Hyperkalemia
Hypokalemia
Hypernatremia
Hyponatremia
#13

Which ECG finding is characteristic of ventricular fibrillation?

Sawtooth pattern
Irregularly irregular rhythm
No discernible P waves
Quivering baseline
#14

Which medication is commonly used to terminate supraventricular tachycardia by blocking AV nodal conduction?

Amiodarone
Adenosine
Atropine
Lidocaine
#15

What is the term for an ECG finding characterized by a gradual, progressive increase in the PR interval until a QRS complex is dropped?

First-degree heart block
Second-degree heart block, Mobitz type I (Wenckebach)
Second-degree heart block, Mobitz type II
Third-degree heart block
#16

Which condition is characterized by episodes of rapid heart rate originating above the ventricles with a narrow QRS complex on ECG?

Atrial fibrillation
Ventricular tachycardia
Supraventricular tachycardia
Atrial flutter
#17

In which type of heart block does the PR interval progressively lengthen until a QRS complex is dropped?

First-degree heart block
Second-degree heart block, Mobitz type I (Wenckebach)
Second-degree heart block, Mobitz type II
Third-degree heart block
#18

What is the term for an ECG pattern characterized by ST-segment elevation in leads V1-V3 with a right bundle branch block pattern?

Wolff-Parkinson-White syndrome
Brugada syndrome
Ventricular tachycardia
Right ventricular infarction
#19

In which ECG lead would you typically observe Q waves if there is an old myocardial infarction involving the inferior wall of the heart?

Lead I
Lead II
Lead III
Lead aVF
#20

Which ECG lead placement is most useful for detecting acute myocardial infarction involving the anterior wall of the heart?

Lead V1
Lead II
Lead III
Lead aVL

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