Electrocardiography Quiz

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Questions and Answers

Which ECG characteristic is most commonly associated with myocardial infarction?

ST elevation (correct)

T wave inversion

Pathologic Q waves

ST depression

Which leads are most likely to show inverted T waves in ischemia?

V2-V6 (correct)

II, III, AVF

I, AVL

VI, V2

Which of the following leads is associated with anterior myocardial infarction?

II, III, AVF

V5, V6 (correct)

I, AVL

VI, V2

Which leads are included in a 12-lead ECG (EKG)?

All of the above Signup and view all the answers

What does the PR interval represent in an ECG?

Beginning of atrial contraction to beginning of ventricular contraction Signup and view all the answers

What does the QT interval represent in an ECG?

Time from start of Q wave to end of T wave Signup and view all the answers

Which leads provide six viewpoints of cardiac activity in the frontal plane?

I, II, III, AVR, AVL, AVF Signup and view all the answers

What is the normal range of the QRS interval?

< 0.10-0.12s Signup and view all the answers

How is the heart rate estimated using the box method on an ECG?

By counting the number of QRS complexes in the entire recording Signup and view all the answers

Which node is responsible for setting the heart rate if the SA node fails?

AV junction Signup and view all the answers

What does a narrow QT interval indicate?

Increased risk of rapid ventricular rhythm Signup and view all the answers

What is the normal adult resting heart rate?

50-60 bpm Signup and view all the answers

Which type of heart block is characterized by prolonged PR interval?

First degree Signup and view all the answers

What is the characteristic feature of right bundle branch block (RBBB) on an ECG?

Prolonged QRS complex Signup and view all the answers

Which component of the ECG represents atrial depolarization?

A) P wave Signup and view all the answers

What does the QRS complex represent in an ECG?

C) Ventricular depolarization Signup and view all the answers

What does the PR interval signify in an ECG?

A) The time between the beginning of atrial contraction and the beginning of ventricular contraction Signup and view all the answers

Which leads are used to record the heart's electrical activity in the frontal plane?

B) Limb leads (I, II, III, AVR, AVL, AVF) Signup and view all the answers

Which wave represents ventricular repolarization in an ECG?

D) T wave Signup and view all the answers

Which part of the ECG represents the time taken for ventricular depolarization and repolarization?

C) QRS complex Signup and view all the answers

Which ECG characteristic is typically associated with acute myocardial infarction (MI)?

ST elevation Signup and view all the answers

What does the presence of elevated ST segments on an ECG indicate?

Myocardial infarction Signup and view all the answers

Which lead configuration records electrical activity in both the frontal and horizontal planes of the heart during an ECG?

Chest leads Signup and view all the answers

What is the normal range for the PR interval in an ECG?

< 0.12 seconds Signup and view all the answers

Study Notes

ECG Characteristics

ST segment elevation is the most commonly associated ECG characteristic with myocardial infarction.
Leads II, III, and aVF are most likely to show inverted T waves in ischemia.

Leads and ECG Components

Leads V1-V6 are associated with anterior myocardial infarction.
A standard 12-lead ECG includes the following leads: I, II, III, aVR, aVL, aVF, V1, V2, V3, V4, V5, and V6.
The PR interval represents the time taken for atrial depolarization and AV node delay.
The QT interval represents the time taken for ventricular depolarization and repolarization.

Frontal Plane and Heart Rate

Leads I, II, III, aVR, aVL, and aVF provide six viewpoints of cardiac activity in the frontal plane.
The normal range of the QRS interval is 0.08-0.10 seconds.
The heart rate can be estimated using the box method on an ECG by counting the number of large squares between two successive R-waves.

Heart Block and Bundle Branch Block

The AV node is responsible for setting the heart rate if the SA node fails.
A narrow QT interval indicates a shorter time taken for ventricular depolarization and repolarization.
A prolonged PR interval is characteristic of first-degree heart block.
The characteristic feature of right bundle branch block (RBBB) on an ECG is a widened S wave in lead I and a widened R wave in lead V1.

ECG Components

The P wave represents atrial depolarization.
The QRS complex represents ventricular depolarization.
The PR interval signifies the time taken for atrial depolarization and AV node delay.
The T wave represents ventricular repolarization.

Heart Rate and Myocardial Infarction

The normal adult resting heart rate is 60-100 beats per minute.
ST segment elevation on an ECG indicates acute myocardial infarction (MI).
A 12-lead ECG can record electrical activity in both the frontal and horizontal planes of the heart.

Intervals and Ranges

The normal range for the PR interval is 0.12-0.20 seconds.

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Test your knowledge on Electrocardiography with this quiz! Challenge yourself with questions on diagrams and illustrations related to Electrocardiography.