Which of the following conditions could be responsible for this heart rate?
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.
A) Second-degree A-V block
B) Atrial flutter
C) Sinus arrhythmia
D) Atrial fibrillation
A) Second-degree A-V block
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.
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A) True B) False
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