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Hypertension, Vol 17, 652-660, Copyright © 1991 by American Heart Association

ARTICLES

Red blood cell lithium-sodium countertransport in the tecumseh blood pressure study

AB Weder, NJ Schork, L Krause and S Julius
University of Michigan, Department of Internal Medicine, Ann Arbor 48109.

Human essential hypertension has more than one cause, but to dissect out subtypes, markers are required. The maximal activity of red blood cell lithium-sodium countertransport has been shown to be increased in hypertensive patients in case-control and population-based studies; in the latter, its distribution is a mixture of two overlapping but distinguishable subpopulations. In the present study, we classified 705 participants in the Tecumseh Blood Pressure Study as having either normal (mean, 0.234 mmol/l cells/hr; n = 614) or high (mean, 0.463 mmol/l cells/hr; n = 91) red blood cell lithium-sodium countertransport to determine if the red blood cell marker is associated with distinctive physiological characteristics. We found that subjects with elevated lithium-sodium countertransport have higher average blood pressure and a greater prevalence of hypertension than those with normal countertransport and that elevated blood pressure had been present since youth. Hemodynamically, the high countertransport group is characterized by elevated vascular resistance, whereas sympathetic nervous system activity appears to be slightly depressed. Subjects with increased lithium-sodium countertransport, compared with those with normal countertransport, have significantly lower average left ventricular mass index and only very infrequently demonstrate left ventricular hypertrophy. Our results support the usefulness of measurements of the maximal activity of red blood cell lithium-sodium countertransport as a way of distinguishing subgroups in the population. Our data are consistent with the idea that subjects with an elevated maximal activity for red blood cell lithium-sodium countertransport are a subset of the population with a genetic lesion that predisposes them to the development of essential hypertension.

This article has been cited by other articles:

				A. B. Weder, M. C. Delgado, X. Zhu, L. Gleiberman, D. Kan, and A. Chakravarti Erythrocyte Sodium-Lithium Countertransport and Blood Pressure: A Genome-Wide Linkage Study Hypertension, March 1, 2003; 41(3): 842 - 846. [Abstract] [Full Text] [PDF]