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. Atrial fibrillation: Atrial fibrillation is characterized by an irregularly irregular rhythm and the absence of identifiable P waves. It does not present with a consistent PR interval, making this an incorrect match for the findings. B. First-degree atrioventricular block: This rhythm is defined by a consistently prolonged PR interval greater than 0.20 seconds with every P wave followed by a QRS complex. A PR interval of 0.35 seconds fits this definition, making this the correct answer. C. Complete heart block: In third-degree or complete heart block, there is no relationship between P waves and QRS complexes—the atria and ventricles beat independently. The PR interval varies and is not constant. D. Premature atrial complexes: These are early beats originating from the atria, often with a shortened or normal PR interval and an abnormal P wave. A consistently prolonged PR interval is not characteristic of PACs.