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Review Question - QID 100643

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QID 100643 (Type "100643" in App Search)
An 85-year-old man presents to his primary care provider after feeling "lightheaded." He said he helped his wife in the garden for the first time, but that while moving some bags of soil he felt like he was going to faint. He had a big breakfast of oatmeal and eggs prior to working in the garden. He has no significant past medical history and takes a baby aspirin daily. Physical exam reveals an elderly, well-nourished, well-built man with no evidence of cyanosis or tachypnea. Vital signs show normal temperature, BP 150/70, HR 80, RR 18. Cardiac exam reveals crescendo-decrescendo systolic murmur. What is the most likely cause of this patient's diagnosis?