(Hypertension. 2002;39:914.)
© 2002 American Heart Association, Inc.
Scientific Contributions |
From the Departments of Medicine and Radiology, Harvard Medical School and Brigham and Womens Hospital (N.D.L.F., S.H., P.N.H., N.K.H., G.H.W.), Boston, Mass; and Jeunemaitre: Centre dInvestigation Clinique 92401 Inserm/AP, Departement de Genetique, Hopital European Georges Pompidou (X.J.), Paris, France.
Correspondence to Naomi D.L. Fisher, MD, Brigham and Womens Hospital, 221 Longwood Ave, Boston, MA 02115. E-mail nfisher{at}partners.org
Low-renin hypertension, representing roughly one quarter of all essential hypertension, is widely recognized by distinct physiological features, including salt-sensitivity, diuretic- responsiveness, and a favorable natural history. Although certain demographic features including age, ethnicity, and diabetes mellitus predispose to low-renin hypertension, these factors account for only a minority of cases. We examined familial concordance for renin status in 119 families with 257 hypertensive members. Low-renin was defined rigorously by plasma renin activity
0.69 ng angiotensin I/L per second, drawn when subjects had achieved balance after 5 to 7 days on a 10 mmol sodium diet and had stood upright for at least 1 hour. Given the prevalence of low-renin hypertension in our general population, low-renin hypertension was significantly more concordant among siblings than expected by chance (P=0.01). There were twice as many low-renin families as expected (10.9% versus 5.5%), in sharp contrast to the normal-renin state, in which the observed and expected were similar (61.0% versus 58.6%). These results were independent of age, race, and gender. Variance in renin status attributable to family membership was 35%. Association studies were performed on 8 polymorphisms in 5 candidate genes, and significant association was confirmed with the G460W polymorphism of the adducin gene. Familial determinants, which are probably but not definitely genetic, contribute to the low-renin hypertension state.
Key Words: renin sodium siblings genetics
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