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Cardiac Dysrhythmias and Electrocardiography Quiz

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#1

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

P wave
Explanation

First deflection in ECG, representing atrial depolarization.

#2

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

Atrial fibrillation
Explanation

Irregular heart rhythm originating in the atria.

#3

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

Ventricular tachycardia
Explanation

Rapid heartbeat from ventricles.

#4

Which segment of the ECG represents ventricular depolarization?

QRS complex
Explanation

Ventricular contraction.

#5

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

0.04 - 0.10 seconds
Explanation

Time from atrial depolarization to ventricular depolarization.

#6

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

Lead II
Explanation

Record electrical activity from right arm to left leg.

#7

Which ECG finding is characteristic of hyperkalemia?

Peaked T waves
Explanation

Tall, tent-like T waves.

#8

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

Long QT syndrome
Explanation

Increased risk of dangerous heart rhythms.

#9

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

Second-degree heart block, Mobitz type I (Wenckebach)
Explanation

Progressive lengthening of PR interval until dropped beat.

#10

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

Brugada syndrome
Explanation

Specific ECG pattern associated with genetic condition.

#11

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 III
Explanation

View of inferior wall of heart.

#12

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

Lead V1
Explanation

View of electrical activity over anterior wall.

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