One-year follow-up of renal function in endemic nephropathy families

Abstract

Introduction. Endemic nephropathy is familial, chronic tubulointerstitial disease with an insidious onset and asymptomatic, slow progressive course. Objective. The present study was undertaken with the aim to find out whether new persons with renal disorders can be detected among members of endemic families in the village of Sopic (Kolubara River region, Serbia). Methods. The study involved 44 members of five endemic families without history of renal disorders. Objective survey and laboratory analyzes that enabled determination of kidney functions (creatinine clearance, proteinuria, urine specific gravity and osmolality, fractional sodium excretion (FENa), the rate of tubular phosphate reabsorption (TRP), urine N-acetil-D-glycosaminidase and intestinal alkaline phosphatase) were done in all examined persons three times during the 6-month intervals. Results. At the first examination, hypertension was detected in 23 (52%) person, decreased creatinine clearance in two and proteinuria in 10 persons included in the study. In addition, proteinuria and tubular disorders were detected in 6, hypertension, proteinuria and/or tubular disorders in 9 persons. The analysis of the results obtained by three check-ups undertaken during one year showed that proteinuria and tubular disorders appeared intermittently in half of the examined endemic family members. All persons with detected renal disorders required further examination in order to establish accurate diagnosis of renal disease. Conclusion. Three check-ups performed at six-month intervals in the members of five endemic families detected various renal disorders including renal hypofunction. Regular systematic check-ups of endemic families could enable early detection of the disease and early initiation of measures for slowing down chronic renal disease progression.