Timedora
Free Practice Quiz Question List

4 12-Lead ECG Interpretation Online Quiz Questions

Use this free practice quiz with 20 questions to review 4 12-Lead ECG Interpretation, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

What does a 12-lead ECG record?

  1. A

    It provides 12 separate anatomical views of the heart.

  2. B

    It records the heart’s electrical activity from different directions.

  3. C

    It directly images the heart’s chambers and valves.

  4. D

    It measures only the electrical activity of the ventricles.

02
Choose one
1 point

Which combination of findings best supports right bundle branch block (RBBB)?

  1. A

    Broad, notched R waves in I and V6 with a predominantly negative QRS in V1.

  2. B

    An rsR′/rSR′-type pattern in V1–V2 and a broad terminal S wave in I and V6.

  3. C

    A prominent R wave in V1 with deep S waves in the lateral chest leads.

  4. D

    A broad P wave in lead II with a prominent terminal negative portion in V1.

03
Choose one
1 point

When estimating the frontal-plane QRS axis using the most isoelectric limb lead, what is the approximate relationship between that lead and the axis?

  1. A

    The axis lies roughly perpendicular to that lead.

  2. B

    The axis points in the same direction as that lead.

  3. C

    The axis is always 0°.

  4. D

    The axis cannot be estimated from limb leads.

04
Choose one
1 point

Which pattern best supports left bundle branch block (LBBB)?

  1. A

    Broad, often notched R waves in I, aVL, V5, and V6, usually without normal septal q waves in those lateral leads, and a predominantly negative QRS in V1.

  2. B

    An rsR′/rSR′-type pattern in V1–V2 with a broad terminal S wave in I and V6.

  3. C

    A broad P wave in lead II and a prominent terminal negative P-wave portion in V1.

  4. D

    A narrow QRS with a tall, peaked P wave in the inferior leads.

05
Choose all
1 point

Select all P-wave findings that can suggest an atrial abnormality.

  1. A

    Tall, peaked P waves, especially in inferior leads, can suggest right atrial abnormality.

  2. B

    A prominent R wave in V1 with deep S waves in lateral chest leads can suggest left atrial abnormality.

  3. C

    A broad or notched P wave in lead II can suggest left atrial abnormality.

  4. D

    A broad terminal S wave in lead V6 can suggest right atrial abnormality.

06
Choose all
1 point

Select all findings that are described as part of a right ventricular hypertrophy (RVH) pattern.

  1. A

    Right-axis deviation.

  2. B

    Left-axis deviation.

  3. C

    A relatively prominent R wave in V1 with deep S waves in lateral chest leads.

  4. D

    A broad, notched R wave in lateral leads with a predominantly negative QRS in V1.

07
True or false
1 point

True or false: If lead I is positive and aVF is negative, a negative QRS in lead II indicates an axis likely below −30°, meeting the usual definition of left-axis deviation.

  1. A

    True

  2. B

    False

08
True or false
1 point

True or false: Bundle branch block can cause secondary ST-T changes that commonly point opposite to the main QRS deflection and complicate ischemia assessment.

  1. A

    True

  2. B

    False

09
Written response
1 point

In one familiar LVH voltage rule, what is the minimum summed voltage of S in V1 and R in V5 or V6? Enter the value in millimetres.

10
Written response
1 point

What is the minimum QRS duration generally used as part of the definition of a complete bundle branch block? Enter the value in milliseconds.

11
Fill in the blank
1 point

The ECG leads that view the inferior region are .

12
Fill in the blank
1 point

ST depression in V1–V3, especially with prominent R waves, can be a clue to .

13
Open ended
1 point

A person being assessed for possible acute coronary syndrome has an initially nondiagnostic ECG but persistent or recurrent symptoms. Explain what the ECG result does not rule out and what further assessment may be needed.

14
Choose one
1 point

A patient's QRS complexes are positive in both lead I and lead aVF. What is the initial frontal-plane axis estimate?

  1. A

    Normal axis quadrant

  2. B

    Leftward quadrant

  3. C

    Right-axis deviation

  4. D

    Extreme or indeterminate axis

15
True or false
1 point

If an ECG is initially nondiagnostic in a person with possible acute coronary syndrome, an evolving event has been ruled out.

  1. A

    True

  2. B

    False

16
Choose one
1 point

ST elevation is present in leads II, III, and aVF. Which regional injury pattern does this lead group point to?

  1. A

    An anterior injury pattern

  2. B

    An inferior injury pattern

  3. C

    A lateral injury pattern

  4. D

    A septal injury pattern

17
Written response
1 point

Lead I is positive and aVF is negative. Which single lead should you check to help distinguish a borderline leftward axis from left-axis deviation?

18
Choose one
1 point

A tracing has an rsR′-type pattern in V1 and a broad terminal S wave in lead I. Which conduction pattern best fits these findings?

  1. A

    A broad, often notched R wave in I, aVL, V5, and V6, with a predominantly negative QRS in V1

  2. B

    A prominent terminal negative P-wave portion in V1 and a broad P wave in lead II

  3. C

    An rsR′/rSR′-type pattern in V1–V2 with a broad terminal S wave in I and V6

  4. D

    A prominent R wave in V1 with deep S waves in lateral chest leads

19
Choose one
1 point

Using the familiar LVH voltage rule described here, what minimum sum is used for the S wave in V1 plus the R wave in V5 or V6?

  1. A

    At least 35 mm

  2. B

    At least 20 mm

  3. C

    At least 50 mm

  4. D

    At least 120 mm

20
Written response
1 point

ST depression in V1–V3 is accompanied by prominent R waves. What regional injury pattern can this combination suggest?