ecg learning center logoThe 12 Lead ECG and Method of Interpretation (Lessons I and II)

Question 1: Determine the QRS axis for this ECG

Determine the QRS axis for this ECG
A. Indeterminate
B. +90 degrees
C. -30 degrees
D. -45 degrees
E. +150 degrees

Question 2: Determine the axis for this ECG

Determine the axis for this ECG
A. +90 degrees
B. Indeterminate
C. +30 degrees
D. -30 degrees
E. -150 degrees

Question 3: What is the normal range of the QRS axis?

A. 0 degrees to 180 degrees
B. 0 degrees to +90 degrees
C. -30 degrees to +90 degrees
D. -90 degrees to +90 degrees
E. -90 degrees to +30 degrees

Question 4: What direction of current do leads V1 and V2 measure?

A. Left / Right forces
B. Leftward forces only
C. Anterior / Posterior forces
D. Superior / Inferior forces
E. Inward / Outward forces

Question 5: What lead measures about the same direction of current as lead I?

A. aVF
B. II
C. III
D. V1
E. V6

Question 6: Determine the QRS axis for this ECG:

Determine the QRS axis for this ECG:
A. -60 degrees
B. -45 degrees
C. +60 degrees
D. Indeterminate
E. 0 degrees

Question 7: Determine the QRS axis for this ECG:

Determine the QRS axis for this ECG:
A. -75 degrees
B. -30 degrees
C. 0 degrees
D. +45 degrees
E. Indeterminate

Question 8: Determine the QRS axis for this ECG:

Determine the QRS axis for this ECG:
A. -15 degrees
B. +15 degrees
C. +60 degrees
D. +105 degrees
E. Indeterminate

Question 9: Determine the QRS axis for this ECG:

Determine the QRS axis for this ECG:
A. -100 degrees
B. -30 degrees
C. +15 degrees
D. +90 degrees
E. Indeterminate

Question 10: What lead primarily measures forces moving from the head to the feet (inferiorly)?

A. Lead I
B. aVF
C. aVL
D. V1
E. V6