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Left ventricular geometry and endogenous ouabain in a Flemish population.

Abstract：

BACKGROUND:Endogenous ouabain, an endogenous digitalis-like steroid, is synthesized in the adrenal glands and possibly in the hypothalamus. In vitro and in vivo, endogenous ouabain triggers growth and proliferation of cardiomyocytes. OBJECTIVE:We therefore investigated the association between left ventricular structure and function and plasma endogenous ouabain in a general population. METHODS:We randomly recruited 536 individuals from a general population (50.7% women, mean age 53.1 years). Measurements included echocardiographic left ventricular structure and function, blood pressure, plasma endogenous ouabain, and the 24-h urinary excretion of sodium. RESULTS:The geometric mean plasma endogenous ouabain was 95.5 pmol/l (interquartile range 79.4-120.2 pmol/l). We expressed effect sizes for a 1-SD increase in plasma endogenous ouabain (0.21 on the logarithmic scale), while accounting for important covariables. For a 1-SD increment in plasma endogenous ouabain, SBP, left ventricular posterior wall, the interventricular septum, and relative wall thickness increased by 1.59 mmHg (P = 0.009), 0.138 mm (P = 0.003), 0.152 mm (P = 0.013), and 0.71 x 10 (P = 0.008), respectively. In a sensitivity analysis, involving 431 individuals aged 29-71 years (10-90th percentile interval), a 1-SD increase in plasma endogenous ouabain was associated with opposite trends in ejection fraction (+0.90%, P = 0.005) and left ventricular systolic longitudinal strain (-0.48%, P = 0.011). Moreover, in individuals whose sodium excretion was above median (160 mmol/24 h), the aforementioned associations reached a higher level of statistical significance. CONCLUSION:Our population-based study suggested that endogenous ouabain might have a trophic effect on the myocardium, independent of blood pressure and other covariables. The clinical implication of these findings remains to be elucidated.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Kuznetsova T,Manunta P,Casamassima N,Messaggio E,Jin Y,Thijs L,Richart T,Fagard RH,Bianchi G,Staessen JA

doi

10.1097/HJH.0b013e32832e49a8

subject

Has Abstract

pub_date

2009-09-01 00:00:00

pages

1884-91

issue

eissn

0263-6352

issn

1473-5598

journal_volume

pub_type

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Left ventricular geometry and endogenous ouabain in a Flemish population.