At the beginning and at the end of the observation period, besides the clinical test, some other tests will be carried out: echocardiography, pulse wave velocity (PWV), ambulatory blood pressure monitoring (ABPM). Blood will be collected for laboratory tests such as: lipid profile, uric acid, C reactive protein (CRP), blood urea nitrogen (BUN), creatinine, morphology, calcium (Ca),phosphorus (P), Ca x P, ionogram, xanthine oxidase, monocyte chemoattractant protein (MPC1),Omega-3 acids, resolvin and protectins - the metabolites of Omega-3 acids, creatinine excretion, MPC1 excretion and excretion of uric acid. The patients will be treated with Omega-3 acids as a Gold Omega 3 preparation (2x1 capsule where 1 capsule = 1000 mg) for 6 months.