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?

Rationale: A. First-degree atrioventricular block: A first-degree AV block is characterized by a prolonged but consistent P-R interval greater than 0.20 seconds. A P-R interval of 0.35 seconds with no dropped beats is a classic sign of this dysrhythmia. B. Atrial fibrillation: Atrial fibrillation presents with an irregularly irregular rhythm and absent distinct P waves. The presence of a consistent P-R interval rules out atrial fibrillation. C. Premature atrial complexes: PACs are identified by early P waves that may look different from sinus P waves, often followed by a normal QRS complex. They do not cause consistently prolonged P-R intervals. D. Complete heart block: Complete (third-degree) heart block involves no association between P waves and QRS complexes. The atria and ventricles beat independently, which contradicts the presence of a consistent P-R interval.