[The significance of microproteinuria for the diagnosis of kidney involvement in hypertensive disease and secondary forms of arterial hypertension].

N-acetyl-beta-glucosaminidase (NAG) activity, the concentrations of microalbumin (MA) and B2-microglobulin (B2-MG) were measured in urine of 50 healthy subjects and 200 patients suffering from arterial hypertension (AH) with preserved renal function, including patients with essential hypertension (EH), stages I and II, chronic pyelonephritis (CPN), chronic glomerulonephritis (CGN) and vasorenal hypertension (VRH). The healthy subjects, the patients with stage II EH, and those with secondary forms of AH demonstrated significant differences in NAG activity in urine. A positive correlation (r = +0.53; p < 0.03) was discovered between systolic AP and NAG activity in urine of EH patients. The concentration of MA in urine of CGN and VRH patients was significantly higher than that in the healthy subjects, EH and CPN patients. The patients with CPN and VRH showed significantly higher levels of B2-MG in urine.