✅ The verified answer to this question is available below. Our community-reviewed solutions help you understand the material better.
An 80-year-old woman is brought in by her partner due to recurrent episodes of syncope which are witnessed. There are no prodromal symptoms. She is on metoprolol for hypertension and it was recently increased from 25 mg twice daily to 50 mg twice daily.
On examination, she looks well. She does not describe any prodromal symptoms prior to her syncopal episodes. On examination, HR 40 bpm, BP 130/80 mm Hg.
Question: Which of the following conditions is most important to rule out?