Renal manifestations in the metabolic syndrome.

The metabolic syndrome, which is characterized by obesity, serum lipid profile alterations, hypertension, and fasting hyperglycemia, is very common in developed countries, and its prevalence is likely to increase. Chronic kidney disease (CKD) also has become a significant public health problem because it affects a considerable proportion of the adult population and is a major risk factor for cardiovascular disease and premature death. Although it is widely known that the metabolic syndrome is a major risk factor for the development of type 2 diabetes and cardiovascular disease, its precise relationship with the risk for renal impairment only recently has been clarified: Patients with the metabolic syndrome are at significantly higher risk for microalbuminuria and/or CKD, and the level of risk is related to the number of components of the syndrome itself. Although it is difficult to discriminate the detrimental renal effects of the metabolic syndrome from those of hypertension and impaired glucose metabolism, its other aspects (particularly obesity) may favor independently the development of renal abnormalities and may be considered new modifiable risk factors for CKD. These observations provide a rationale for intervention studies that aim to verify whether treating the many components of the metabolic syndrome can effectively prevent the development and progression of renal damage.