To the Editor: The Cooperative Study of Renovascular Hypertension1 defined “cure” as consisting of a diastolic blood pressure of 90 mm Hg or less and a decrease of 10 mm Hg or more; and “improvement” as involving a diastolic blood pressure at least 15 per cent lower (and less than 110 mm Hg). Furthermore, the patient's pressure had to be evaluated 12 months or more after treatment intervention; i.e., the presence of persistent benefit was a sine qua non. Sos et al.2 report, “After successful angioplasty, blood pressure was reduced to normal or improved … in 84 per cent of. © 1984, Massachusetts Medical Society. All rights reserved.
