A 68-year-old woman with hypertension on atenolol 50 mg twice daily (recently increased 10 days ago), type 2 diabetes, and hypothyroidism on levothyroxine presents with two episodes of presyncope, lightheadedness, and diaphoresis while standing. Vital signs show HR 42 bpm, BP 108/62 mmHg supine and 96/58 mmHg standing. Her 12-lead ECG is shown. The rhythm marked **A** demonstrates which of the following characteristics that is MOST consistent with drug-induced sinus bradycardia?
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