A 68-year-old retired waiter comes to your clinic for evaluation of fatigue. You perform a cardiac examination and find that his pulse rate is less than 60. Which of the following conditions could be responsible for this heart rate?

Question

Quizplus · Accepted Answer

A second-degree A-V block can result in a pulse rate less than 60. Atrial flutter and atrial fibrillation do not cause bradycardia unless there is a significant accompanying block. Sinus arrhythmia does not cause bradycardia and represents respiratory variation of the heart rate.

A 68-Year-Old Retired Waiter Comes to Your Clinic for Evaluation