A 72 year old man presented with severe, disabling, refractory orthostatic hypotension (low blood pressure) of two years duration. His blood pressure on standing was 74/40 despite treatment with midodrine 10 mg three times daily and florinef 0.1 mg once daily. His physical exam and neurologic exam were otherwise unremarkable.
He had a partial gastrectomy (removal of the stomach) for an ulcer twenty years ago. His kidney function was normal. He was slightly anemic (hemoglobin 10.9). His vitamin B12 level was within the normal range (297).
A diagnostic test was performed.
After a month of treatment with an oral medication, his systolic blood pressure improved to 140s on standing and he was weaned from florinef and midodrine.
What was the test, and what was the treatment? (Answers in comments.)
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