Percutaneous Transluminal Renal Angioplasty in Renovascular Hypertension

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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 . . .