A nurse on a telemetry unit is assessing a client who is receiving continuous cardiac monitoring. The client's heart rate is 69/min and the PR interval is 0.24 seconds. The nurse should interpret this finding as which of the following cardiac rhythms?

A) Premature ventricular contraction: A premature ventricular contraction (PVC) typically presents as an early heartbeat originating from the ventricles, often accompanied by a wide QRS complex. The heart rate in this case is regular at 69/min, and there is no indication of early beats, making this option unlikely. B) First-degree AV block: A first-degree AV block is characterized by a prolonged PR interval greater than 0.20 seconds, which is noted at 0.24 seconds in this scenario. This indicates a delay in conduction through the AV node. While the heart rate is normal, the prolonged PR interval clearly suggests a first-degree AV block. C) Atrial fibrillation: Atrial fibrillation typically presents with an irregularly irregular rhythm and variable heart rates. The client’s heart rate of 69/min is regular, and there is no mention of an irregular pulse or varying R-R intervals, making atrial fibrillation an unlikely diagnosis in this case. D) Sinus bradycardia: Sinus bradycardia is defined as a heart rate of less than 60 beats per minute and is characterized by a normal PR interval. In this situation, the heart rate is 69/min, which does not meet the criteria for bradycardia, thus ruling out this option.