Introduction to 12-Lead ECG: The Art of Interpretation


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Arrhythmia Recognition Webcast Series

1: Third-degree AV block is characterized by:

AV dissociation

More P waves than QRS complexes

Variable PR intervals

Junctional or ventricular escape rhythms

All of the above.

2: A patient in third-degree AV block could be hemodynamically stable. Those patients should still be considered candidates for emergency pacing because they could become hemodynamically compromised at any moment.

TRUE

FALSE

3: If the number of atrial and ventricular complexes is equal, we refer to the rhythm as AV dissociation instead of third-degree AV block.

TRUE

FALSE

4: The criteria for low voltage on an ECG include:

QRS complexes in the limb leads less than or equal to 5 mm

QRS complexes in the limb leads less than or equal to 10 mm

QRS complexes in the precordial leads less than or equal to 10 mm

QRS complexes in the precordial leads less than or equal to 5 mm

Both A and C are correct.

5: Low voltage is a result of something dampening the electrical signals produced by the heart. You should always suspect a pericardial effusion until proven otherwise.

TRUE

FALSE

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