Electrocardiogram (ECG) Quiz

What does an ECG visualize?

• Oxygen levels in the heart

• Heart rate

• Electricity flowing through the heart

• Blood flow through the heart

What is the name of the set of electrodes used in lead II?

• Lead III

• Lead IV

• Lead II

• Lead I

What does a positive deflection on an ECG tracing indicate?

• Depolarization wave moving towards the electrode

• Repolarization wave moving away from the electrode

• Repolarization wave moving towards the electrode

• Depolarization wave moving away from the electrode

How many electrodes are used in a standard ECG?

• 12

• 6

• 10

• 8

Which leads are considered 'inferior' leads in an ECG?

• Leads V1 and V2

• Leads I and aVL

• Leads I, II, and III

• Leads II, III, and aVF

What is the purpose of having different leads in an ECG?

• To reduce the accuracy of the ECG

• To make the ECG tracing longer

• To confuse the reader

• To provide different views of the heart

Which artery supplies blood to the lateral wall of the heart?

• Right anterior descending artery

• Left anterior descending artery

• Right coronary artery

• Left circumflex artery

Which leads are considered 'septal' leads in an ECG?

• Leads V3 and V4

• Leads I and aVL

• Leads II, III, and aVF

• Leads V1 and V2

What is the total number of leads in a 12-lead ECG?

• 8

• 6

• 10

• 12

What does a negative deflection on an ECG tracing indicate?

• Depolarization wave moving towards the electrode

• Repolarization wave moving towards the electrode

• Repolarization wave moving away from the electrode

• Depolarization wave moving away from the electrode