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To the Editor:We disagree with Danser et al1 that, in patients taking the renin inhibitor aliskiren, “it is the stoichiometry that counts, not the rise in renin.” In fact, plasma renin activity (PRA) is a more explicit indicator than stoichiometry. A PRA fall during aliskiren means that renal renin secretion did not increase by much. A PRA rise means that the increase in renal renin secretion was large enough to overwhelm the aliskiren blockade of PRA. It is that simple. …

It Is the Plasma Renin Activity Level That Counts, not Stoichiometry