In 2:1 AV block, _____
a. the atrial rhythm (P-P interval) is regular
b. the ventricular rhythm (R-R interval) is irregular
c. the PR interval lengthens until a P wave appears with no QRS complex
d. there is no PR interval because the atria and ventricles beat independently of each other
A
Second-degree 2:1 AV block is characterized by P waves that are normal in size and shape, but every other P wave is not followed by a QRS. The atrial rate is twice the ventricular rate.
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