Abstract
P178 A polymorphism of the endothelin (ET)-1 gene has been associated with blood pressure (BP) of obese individuals in large population studies. We explored the variability of plasma ET in essential hypertensive sibpairs (n=14 pairs, 13 with two sibs, 1 with three sibs) in relationship to their body mass index (BMI). ET levels were measured on ad libitum Na intake (AL), after a 24 hr Na load (300 mEq iv +160 mEq po, HI) and after 24 hr of Na deprivation (10 mEq po + furosemide 120 mg, LO). BP was 147±3/90±2 mmHg and BMI 35.1±1.4, with 75% of patients exceeding 30 Kg/m 2 . ET was 4.4±0.3, 4.1±0.2, and 4.3±0.3 fmol/ml for AL, HI and LO, respectively, all higher than 20 controls (3.3±0.3, ps 2 =0.79, F=3.2, p
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