A 60 year-old female complains of several episodes of dizzin…
A 60 year-old female complains of several episodes of dizziness and nausea that started this morning. When she changes positions she will get dizzy. She denies trauma, falling, or loss of consciousness. She has a 5 year history of hypertension and takes a beta blocker daily. On physical examination, there are no neurologic deficits or any abnormal findings and ECG is normal. Which of the follow tests should be performed?