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Electrocardiogram (ECG) Interpretation Quiz

#1

Which wave represents atrial depolarization in an ECG?

P wave
Explanation

Atrial depolarization.

#2

What does the QRS complex represent in an ECG?

Ventricular depolarization
Explanation

Depolarization of the ventricles.

#3

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

0.08 to 0.12 seconds
Explanation

Normal PR interval duration.

#4

Which component of the ECG corresponds to ventricular repolarization?

T wave
Explanation

Ventricular repolarization phase.

#5

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

Less than 0.32 seconds
Explanation

Normal QT interval duration.

#6

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

Atrial fibrillation
Explanation

Irregular atrial electrical activity.

#7

Which wave represents ventricular repolarization in an ECG?

T wave
Explanation

Ventricular repolarization.

#8

What does a prolonged PR interval indicate in an ECG?

Atrioventricular block
Explanation

Delayed conduction between atria and ventricles.

#9

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

Lead II
Explanation

Commonly used lead for monitoring.

#10

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

Fourth intercostal space, right sternal border
Explanation

Position for Lead V1.

#11

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

Lead aVF
Explanation

Lead for detecting inferior MI.

#12

What does a wide QRS complex suggest in an ECG?

Ventricular tachycardia
Explanation

Abnormal ventricular depolarization.

#13

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

Hypokalemia
Explanation

Associated with low potassium levels.

#14

What does a negative T wave indicate on an ECG?

Hyperkalemia
Explanation

High potassium levels.

#15

What does ST segment elevation typically indicate on an ECG?

Myocardial infarction
Explanation

Heart attack.

#16

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

Wolff-Parkinson-White syndrome
Explanation

Characteristic of WPW syndrome.

#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 standstill
Explanation

Lack of atrial electrical activity.

#18

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

Wolff-Parkinson-White syndrome
Explanation

Characteristic of WPW syndrome.

#19

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

Atrial flutter
Explanation

Characteristic of atrial flutter.

#20

What does a prolonged QT interval on an ECG suggest?

Risk of ventricular arrhythmias
Explanation

Increased risk of ventricular arrhythmias.

#21

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

Pre-excitation of the ventricles
Explanation

Early activation of ventricles.

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