The patient is a 57-year-old man who complains of lightheadedness for the last 3 days. He has a history of a heart stent placed 4 years ago and has been asymptomatic since that time. He denies vomiting, diarrhea, chest pain, shortness of breath, abdominal pain, or paresthesias. No recent travel. He takes metoprolol and clopidogrel. There is a family history of hypertension
- First-degree AV block
- Multifocal atrial tachycardia
- Wolff-Parkinson-White syndrome (WPW)
- Sinus bradycardia
- Third-degree heart block
