Case Presentation: A 72-year-old man with hypertension and tobacco use presented to the emergency room with three days of nausea, vomiting, substernal chest pain, and thoracic back pain, following weeks of worsening vertigo. He also described a year of progressive tinnitus, diplopia, unsteady gait, and restless legs. Vital signs were stable. Physical exam revealed bilateral [...]

Case Presentation: A 56 year-old man with heart failure with preserved ejection fraction, aphasia and right-sided weakness from prior strokes presented with two days of difficulty with speech and ambulation. His vital signs were normal except for an oxygen (O2) saturation of 94% on 6 liters. On exam he was somnolent but able to follow [...]