A nurse is reviewing a client's cardiac rhythm strips and notes a constant P-R interval of 0.35 seconds. Which of the following dysrhythmias is the client displaying?

A. A constant P-R interval greater than 0.20 seconds is characteristic of a first-degree atrioventricular (AV) block. B. A complete heart block (third-degree block) would result in varying P-R intervals, not a constant one. C. Premature atrial complexes are premature beats that do not affect the P-R interval. D. Atrial fibrillation would not have a consistent P-R interval; the atrial rhythm is irregular in fibrillation.