“Changes in plasma levels of PP were determined as an indirect measure of amplification of endogenous cholinergic activity produced by PD.”
“ PD (120 mg orally) induced a significant rise in plasma concentrations of NE (1.6 +/- 0.…/l), E (0.34 +/ 0.05 vs. 0.12 +/- 0.04 nmol/l) and PP (178.06 +/- 33 vs. 37.57 +/- 7.35 pmol/… rate (HR; 61 +/- 2 vs. 71 +/- 4 beats/min).”