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(Hypertension. 2001;37:429.)
© 2001 American Heart Association, Inc.
Scientific Contributions |
Salt Sensitivity, Pulse Pressure, and Death in Normal and Hypertensive Humans
From Indiana University School of Medicine (M.H.W., N.S.F., S.E.F., M.W.), The Regenstrief Institute for Health Care (M.W.), and the Roudebush Veteran’s Administration Medical Center (M.W.), Indianapolis, Ind.
Correspondence to Dr Myron H. Weinberger, Indiana University School of Medicine, 541 Clinical Dr, Room 423, Indianapolis, IN 46202-5111. E-mail mweinbe{at}IUPUI.edu
Although factors such as age, blood pressure, and its responsiveness to changes in sodium balance and extracellular fluid volume status (salt sensitivity) are associated with an increased risk of end-organ disease and cardiovascular events in hypertensive subjects, no such relationship with mortality has been demonstrated for salt sensitivity in normotensive subjects. We conducted long-term follow-up of 430 normal and 278 hypertensive subjects in whom assessment of salt sensitivity of blood pressure was performed as long as 27 years ago. We ascertained the status of 596 subjects (85% of the total population), 123 (21%) of whom had died. The following initial measurements were significantly (P<0.002) associated with subjects who had died compared with subjects known to be alive: age at study, pulse pressure, systolic, diastolic, and mean arterial pressures, hypertension, salt sensitivity, baseline renin levels, and body mass index (but not body weight). A stepwise logistic regression found the following independent predictors of death (odds ratio, 95% CI): age at initial study (1.08, 1.06 to 1.10), baseline blood pressure (1.03, 1.01 to 1.04), sodium sensitivity (1.73, 1.02 to 2.94), and male gender (1.91, 1.15 to 3.17). When survival curves were examined, normotensive salt-sensitive subjects aged >25 years when initially studied were found to have a cumulative mortality similar to that of hypertensive subjects, whereas salt-resistant normotensive subjects had increased survival (P<0.001). These observations provide unique evidence of a relationship between salt sensitivity and mortality that is independent of elevated blood pressure.
Key Words: sodium • pulse • mortality • blood pressure • hypertension, essential
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