Vascular Impact of Omega-3 in Metabolic Syndrome

Inclusion Criteria: * Female and male patients with treated essential hypertension (blood pressure values\<140/90 mmHg under antihypertensive treatment). * Presence of at least two of the following criteria of the metabolic syndrome: abdominal girth \>102 cm in men or \>88 cm in women, HDL-C\<0.4 g/L in men or \<0.5 g/L in women, fasting triglyceride \>1.5 g/L (or specific treatment for these lipid abnormalities), fasting glucose \>1.10 g/L. Exclusion Criteria: * Secondary hypertension, myocardial infarction, coronary artery disease, cerebrovascular disease, stroke or transient ischemia, cardiac failure, diabetes (or fasting glucose\>1.26 g/L) or renal failure (MDRD \< 50 ml/min) * Severe hypercholesterolemia (total cholesterol \> 2.5 g/l), alcohol or drug abuse, toxicomania, or clinically significant abnormalities in other current biological parameters.