- Norman M Kaplan, MD
Norman M Kaplan, MD
- Editor-in-Chief — Nephrology
- Section Editor — Hypertension
- Clinical Professor of Internal Medicine
- University of Texas Southwestern Medical Center
Long-term follow-up of patients destined to develop primary hypertension (formerly called "essential" hypertension) demonstrates that blood pressure readings gradually increase over time. They may initially be normal, then prehypertensive (or high-normal), and then intermittently elevated; however, the readings may show considerable variability or lability .
The seventh report of the Joint National Committee (JNC 7) published in 2003 originally proposed the following classification based upon the average of two or more properly measured readings at each of two or more visits after an initial screen ; these definitions were reaffirmed by the American and International Societies of Hypertension (ASH/ISH) :
●Normal blood pressure – systolic <120 mmHg and diastolic <80 mmHg
●Prehypertension – systolic 120 to 139 mmHg or diastolic 80 to 89 mmHg
Prevalence — The prevalence of prehypertension among adults in the United States is approximately 37 percent .
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