TH and Hypertension: The excessive sympathetic activity contributes to the pathogenesis of hypertension and progression of organ damage.42 Norepinephrine (NE) and tyrosine hydroxylase (TH; a key enzyme in norepinephrine generation) are usually used as indirect indexes of sympathetic activity.43 To test changes of sympathetic activity after FMT, the level of TH in the proximal colon and NE in the plasma were measured.