An ECG reveals that all sinus nodal impulses are conducted to the ventricles, but the PR interval is greater than 0.2 second and all QRS complexes have normal configurations.What is the best interpretation of this ECG?

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In first-degree AV block, all sinus nodal impulses are conducted to the ventricles, but the conduction time is slowed through the AV node-bundle complex. This slowed conduction is marked by an increase in the PR interval greater than 0.2 second (Figure 19-30). All QRS complexes have normal configurations.

An ECG Reveals That All Sinus Nodal Impulses Are Conducted