| Impact of aldosterone on left ventricular structure and function in young normotensive and mildly hypertensive subjects. | |
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MedLine Citation:
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PMID: 10802001 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Left ventricular (LV) hypertrophy is an independent risk factor for cardiovascular morbidity and mortality. Experimental data revealed that elevated circulating aldosterone is associated with increased collagen accumulation resulting in myocardial fibrosis. To analyze whether aldosterone is also associated with cardiac structural and functional changes in humans, we examined the effects of aldosterone on LV structure and function before and after suppression of aldosterone by increasing oral salt intake. The study group comprised 26 normotensive male white healthy control subjects (age 26 +/- 3 years) and 31 male white subjects (age 25 +/- 3 years) with mild essential hypertension (World Health Organization stages I to II). Two-dimensional-guided M-mode echocardiography and 24-hour ambulatory blood pressure (BP) monitoring was performed in each subject. Simultaneously, we measured 24-hour urinary sodium excretion, 24-hour urinary aldosterone, and serum aldosterone concentration at baseline and after increasing oral salt intake to suppress aldosterone secretion. In all subjects LV mass correlated with body mass index (r = 0.42, p <0.001) and both 24-hour ambulatory systolic (r = 0.28, p <0.05) and diastolic (r = 0.25, p <0.05) BP. Changes in urinary sodium excretion correlated inversely with changes in serum aldosterone concentration (r = -0.28; p <0.05). Urinary aldosterone concentration after salt loading decreased in normotensive (10.98 vs 7.44 microg/24 hours; p <0.02) but not in hypertensive (9.34 vs 10.51 microg/24 hours; p = NS) subjects. Serum and urinary aldosterone levels at baseline were not related to LV structure or function. In contrast, after increasing oral salt intake, urinary aldosterone concentration was related to LV mass (r = 0.43; p <0.01) and impaired midwall fractional fiber shortening (r = -0.33; p <0.02) in all subjects, independent of 24-hour ambulatory BP. Subgroup analysis revealed that this was significant only in hypertensive (r = 0.46; p <0.01 and r = -0.44; p <0.02, respectively) but not in normotensive (r = 0.28 and -0.16; p = NS for both, respectively) subjects. Consistently, the greater serum aldosterone remained after increasing oral salt intake, the greater was LV mass (r = 0.35; p <0.01). The latter was found in hypertensive subjects (r = 0.44; p <0.02), independent of 24-hour ambulatory BP, but not in normotensive subjects (r = 0.025; p = NS). Inadequate suppression of aldosterone in response to an increase in oral salt intake is related to LV structural and functional changes in hypertensive subjects. Thus, our results support experimental data indicating that aldosterone affects LV structure and function in humans and that this effect is BP independent. |
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Authors:
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M P Schlaich; H P Schobel; K Hilgers; R E Schmieder |
Publication Detail:
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Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The American journal of cardiology Volume: 85 ISSN: 0002-9149 ISO Abbreviation: Am. J. Cardiol. Publication Date: 2000 May |
Date Detail:
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Created Date: 2000-07-14 Completed Date: 2000-07-14 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0207277 Medline TA: Am J Cardiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1199-206 Citation Subset: AIM; IM |
Affiliation:
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Department of Medicine IV/Nephrology, University of Erlangen-Nürnberg, Nürnberg, Germany. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aldosterone / blood, physiology*, urine Blood Pressure / drug effects* Blood Pressure Monitoring, Ambulatory Humans Hypertension / metabolism* Male Sodium Chloride / pharmacology*, urine Ventricular Function, Left / drug effects*, physiology |
| Chemical | |
Reg. No./Substance:
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52-39-1/Aldosterone; 7647-14-5/Sodium Chloride |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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