Certified Cardiographic Technician (CCT) Practice exam

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What does a 1st-degree AV block on an ECG show?

Prolonged PR interval with dropped beats

Normal PR interval without any dropped beats

Prolonged PR interval without dropped beats

A first-degree AV block is characterized by a prolonged PR interval on an ECG, which represents the time taken for electrical impulses to travel from the atria to the ventricles. In a first-degree block, this interval is consistently longer than the normal range but all impulses are still conducted, meaning there will be no dropped beats.

The distinguishing feature is that while the PR interval is prolonged, it remains consistent throughout, indicating that every atrial depolarization is followed by a ventricular depolarization. This differentiation is critical because if there were dropped beats, or irregularities in the PR interval, we would be looking at a higher degree of block rather than a first-degree block.

Thus, the correct understanding of a first-degree AV block involves recognizing that the PR interval is indeed prolonged, yet all beats are still transmitted without any loss of impulses.

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Shortened PR interval with irregularity

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