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Hypertension, Vol 13, 408-415, Copyright © 1989 by American Heart Association

ARTICLES

Sodium-lithium countertransport and blood pressure: the Gubbio Population Study

M Laurenzi and M Trevisan
Center for Epidemiological Research, Merck Sharp and Dohme, Rome, Italy.

The relation of red blood cell sodium-stimulated lithium countertransport to blood pressure (BP) and prevalence of hypertension was assessed in univariate and multivariate analyses for 2,748 men and women aged 25-74 years who participated in the baseline examination of the Gubbio Population Study in north central Italy. Since age-specific countertransport values were consistently higher for men than women, all analyses were done for men and women separately. In simple correlation analyses, countertransport was significantly related to systolic and diastolic BP in both sexes (r values 0.107-0.163). In age- adjusted analyses, countertransport was significantly related to BP level of both men and women not receiving antihypertensive treatment; mean levels were high for hypertensive persons receiving antihypertensive therapy compared with normotensive persons. Age- adjusted prevalence rates of hypertension were progressively higher for both sexes in successively higher quintiles of countertransport, almost twice as high for those in the highest quintile compared with those in the lowest quintile. Correspondingly, age-adjusted logistic regression analyses showed countertransport to be related significantly to prevalence of hypertension for both men and women (p less than 0.001). Since age, body mass index, plasma total cholesterol, uric acid, glucose, urinary sodium/potassium excretion, pulse, and (for men) daily alcohol intake also were significantly correlated with BP, and in some instances with countertransport, relation of countertransport to BP was also assessed in multivariate analyses with control for these variables.(ABSTRACT TRUNCATED AT 250 WORDS)

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