A single edit to a single table turned tens of millions of healthy Americans into patients overnight. The question is whether the line was drawn for them or for the people who bill them. In November of 2017, the American College of Cardiology and the American Heart Association released a clinical guideline that ran to roughly four hundred and eighty pages, and somewhere in the front matter they moved a single number. The threshold for diagnosing high blood pressure fell from 140/90 to 130/80. Nobody’s artery changed that day. No chest tightened, no vessel narrowed, no symptom appeared. And yet, by the arithmetic of that one revision, about thirty-one million Americans who had been healthy the previous evening were now classified as having a chronic cardiovascular disease. National prevalence of hypertension climbed from near thirty-two percent of adults to near forty-six percent between one edition of a document and the next, and among adults under forty-five the rate more than doubled. Nothing about the population’s arteries had changed; only the boundary of the word had moved.

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