Understanding Electrocardiography (ECG) and Vector Analysis Quiz

Test your knowledge of electrocardiography with questions on atrial depolarization, QRS complex, myocardial infarction, and more!

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Which component of the ECG represents atrial depolarization?

P wave

QRS complex

T wave

U wave

What does the QRS complex represent in an ECG?

Atrial repolarization

Atrial depolarization

Ventricular depolarization

Ventricular repolarization

Which component of the ECG represents ventricular repolarization?

P wave

QRS complex

T wave

U wave

Which lead is typically used for detecting myocardial infarction?

Lead I

Lead II

Lead III

Lead V1

What does a prolonged QT interval indicate?

Ventricular depolarization

Ventricular repolarization

Atrial depolarization

Atrial repolarization

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

Less than 0.10 seconds

0.12 to 0.20 seconds

0.22 to 0.30 seconds

More than 0.40 seconds

Which ECG lead is used to diagnose inferior wall myocardial infarction?

Lead I

Lead II

Lead III

Lead aVR

What does an inverted T wave indicate in an ECG?

Myocardial infarction

Hypokalemia

Bundle branch block

Hyperkalemia

Which of the following is a correct representation of normal sinus rhythm on an ECG?

Regular P-P intervals, normal QRS complex, inverted T wave

Irregular P-P intervals, widened QRS complex, absent T wave

Regular P-P intervals, normal QRS complex, upright T wave

Irregular P-P intervals, normal QRS complex, inverted T wave

#10

Which vector represents the direction of ventricular depolarization during the QRS complex?

R wave

S wave

Q wave

Vector sum of QRS complex

#11

What does a 'sawtooth' pattern in an ECG indicate?

Atrial fibrillation

Atrial flutter

Ventricular fibrillation

Ventricular tachycardia

#12

What does ST elevation in leads V1-V4 suggest on an ECG?

Myocardial infarction involving the anterior wall

Myocardial infarction involving the inferior wall

Myocardial infarction involving the lateral wall

Myocardial infarction involving the posterior wall

#13

In which leads of an ECG is the P wave typically negative?

Lead I, II, III

Lead aVR, aVL, aVF

Lead V1, V2

Lead V3, V4, V5, V6

#14

What does a PR interval longer than 0.20 seconds suggest on an ECG?

First-degree atrioventricular block

Second-degree atrioventricular block

Sinus bradycardia

Sinus tachycardia

#15

What does the absence of P waves indicate on an ECG?